10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

ý      ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2015

OR

o         TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number 1-9317

EQUITY COMMONWEALTH

(Exact Name of Registrant as Specified in Its Charter)

Maryland	04-6558834
(State or Other Jurisdiction of Incorporation or Organization)	(IRS Employer Identification No.)

Two North Riverside Plaza, Suite 2100, Chicago, IL	60606
(Address of Principal Executive Offices)	(Zip Code)

(312) 646-2800

(Registrant’s Telephone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Act:

Title Of Each Class	Name of Each Exchange On Which Registered
Common Shares of Beneficial Interest	New York Stock Exchange
6 1/2% Series D Cumulative Convertible Preferred Shares of Beneficial Interest	New York Stock Exchange
7 1/4% Series E Cumulative Redeemable Preferred Shares of Beneficial Interest	New York Stock Exchange
5.75% Senior Notes due 2042	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ý    No o

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o    No ý

Indicate by check mark whether the registrant:  (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes ý  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes ý  No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ý

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.  (Check One):

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes o  No ý

The aggregate market value of the voting common shares of beneficial ownership, $0.01 par value, or common shares, of the registrant held by non-affiliates was $3.3 billion based on the $25.67 closing price per common share on the New York Stock Exchange on June 30, 2015.

Number of registrant’s common shares of beneficial interest, $0.01 par value per share, outstanding as of February 16, 2016:  125,925,375.

DOCUMENTS INCORPORATED BY REFERENCE

Certain Information required by Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K is incorporated herein by reference to the definitive Proxy Statement for the 2015 Annual Meeting of Shareholders, which Equity Commonwealth intends to file no later than 120 days after the end of its fiscal year ended December 31, 2015, or our definitive Proxy Statement.

FORWARD LOOKING STATEMENTS

Some of the statements contained in this Annual Report on Form 10-K constitute forward-looking statements within the meaning of the federal securities laws. Any forward-looking statements contained in this Annual Report on Form 10-K are intended to be made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. Forward-looking statements relate to expectations, beliefs, projections, future plans and strategies, anticipated events or trends and similar expressions concerning matters that are not historical facts. In particular, statements pertaining to our capital resources, portfolio performance and results of operations contain forward-looking statements. Likewise, all of our statements regarding anticipated growth in our funds from operations and anticipated market conditions are forward-looking statements. In some cases, you can identify forward-looking statements by the use of forward-looking terminology such as “may,” “will,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” or “potential” or the negative of these words and phrases or similar words or phrases which are predictions of or indicate future events or trends and which do not relate solely to historical matters. You can also identify forward-looking statements by discussions of strategy, plans or intentions.

The forward-looking statements contained in this Annual Report on Form 10-K reflect our current views about future events and are subject to numerous known and unknown risks, uncertainties, assumptions and changes in circumstances that may cause our actual results to differ significantly from those expressed in any forward-looking statement. We do not guarantee that the transactions and events described will happen as described (or that they will happen at all). We disclaim any obligation to publicly update or revise any forward-looking statement to reflect changes in underlying assumptions or factors, of new information, data or methods, future events or other changes. For a further discussion of these and other factors that could cause our future results to differ materially from any forward-looking statements, see the section entitled “Risk Factors” in this Annual Report on Form 10-K.

EQUITY COMMONWEALTH

2015 FORM 10-K ANNUAL REPORT

Table of Contents

Part I
Item 1.	Business	1
Item 1A.	Risk Factors	4
Item 1B.	Unresolved Staff Comments	17
Item 2.	Properties	18
Item 3.	Legal Proceedings	19
Item 4.	Mine Safety Disclosures	19
Part II
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	20
Item 6.	Selected Financial Data	21
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	23
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	43
Item 8.	Financial Statements and Supplementary Data	45
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	45
Item 9A.	Controls and Procedures	45
Item 9B.	Other Information	46
Part III
Item 10.	Directors, Executive Officers and Corporate Governance	47
Item 11.	Executive Compensation	47
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	47
Item 13.	Certain Relationships and Related Transactions, and Director Independence	47
Item 14.	Principal Accountant Fees and Services	47
Part IV
Item 15.	Exhibits and Financial Statement Schedules	48
	Signatures

EXPLANATORY NOTE

References in this Annual Report on Form 10-K to the Company, EQC, we, us or our, refer to Equity Commonwealth and its consolidated subsidiaries as of December 31, 2015, unless the context indicates otherwise.

PART I

Item 1.    Business.

The Company.    We are an internally managed and self-advised real estate investment trust, or REIT, engaged in the ownership and operation primarily of office buildings throughout the United States. We were formed in 1986 under Maryland law and we have elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the Code).

At December 31, 2015, our portfolio included 65 properties (127 buildings) with a combined 24.0 million square feet for a total investment of $3.9 billion at cost and a depreciated book value of $3.0 billion. Following our transition from external management to internal management in 2014, we undertook a comprehensive review of our portfolio and our operations and developed a strategy that focuses on reshaping our portfolio to higher quality assets. We are in the process of executing this strategy and disposed of 91 properties (135 buildings) and one land parcel during 2015, with a combined 18.9 million square feet for an aggregate gross sales price of $2.0 billion, excluding closing costs. As a result of these dispositions, we have concentrated our portfolio, exiting 68 cities, seven states and one country.

We have generated significant proceeds from dispositions and have a cash balance of $1.8 billion as of December 31, 2015. We are seeking to reinvest capital in opportunities that offer a compelling risk-reward profile in order to create a foundation for long-term growth. We also remain focused on creating value through proactive asset management and improving operating results.

As of December 31, 2015, we had 66 full-time employees.

Our principal executive offices are located at Two North Riverside Plaza, Suite 2100, Chicago, Illinois 60606, and our telephone number is (312) 646-2800.

Policies with Respect to Certain Activities

The discussion below sets forth certain additional information regarding our investment, disposition and financing policies. These policies are established by our Board of Trustees and may be changed by our Board of Trustees at any time without shareholder approval.

Investment Policies.    In evaluating potential investments and asset sales, we consider various factors, including but not limited to the following:

• the historical and projected rents received and likely to be received from the property;

• the historical and expected operating expenses, including real estate taxes, incurred and expected to be incurred at the property;

• the growth, tax and regulatory environments of the market in which the property is located;

• the quality, experience and credit worthiness of the property's tenants;

• occupancy and demand for similar properties in the same or nearby markets;

• the construction quality, physical condition and design of the property, and expected capital expenditures that may be needed to be made to the property;

• the location and type of property; and

• the pricing of comparable properties as evidenced by recent market sales.

We have no policies which specifically limit the percentage of our assets which may be invested in any individual property, in any one type of property, in properties in one geographic area, in properties leased to any one tenant or in properties leased to an affiliated group of tenants.

We generally prefer 100% owned investments in fee interests. However, circumstances may arise in which we may invest in leaseholds, joint ventures, mortgages and other real estate interests. We may invest in real estate joint ventures if we conclude

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that by doing so we may benefit from the participation of co-venturers or that our opportunity to participate in the investment is contingent on the use of a joint venture structure. We may invest in participating, convertible or other types of mortgages if we conclude that by doing so we may benefit from the cash flow or appreciation in the value of a property which is not available for purchase. Further, we have in the past provided seller financing for properties we have sold and may do so again in the future.

In the past, we have considered the possibility of entering into mergers or strategic combinations with other companies. We may undertake such considerations in the future. A principal goal of any such transaction will be to increase our profits and diversify their sources.

Disposition Policies.    We have completed a significant number of dispositions over the past two years and currently anticipate disposing of a significant number of our properties as part of our business strategy to reposition our portfolio.

Our Board of Trustees adopted a strategy to consider disposing of assets that have one or more of the following attributes:

• assets that do not offer an opportunity to create a competitive advantage,

• assets that are less than 150,000 square feet,

• assets that are not office buildings,

• assets that are not located in the U.S., or

• assets that produce a low cash yield or require significant capital expenditures.

Disposition decisions are made based on a number of factors including those set forth above and the following:

• the proposed sale price; and

• the existence of alternative sources, uses or needs for capital.

The ability of our management team to implement this business strategy depends substantially on identifying and completing dispositions at favorable prices and successfully redeploying the capital received from dispositions. We expect to reinvest capital received from dispositions we complete but cannot provide any assurances that we will be successful. In addition, it may take a long period of time before we are able to reposition our portfolio.

Financing Policies.    Our revolving credit facility and term loan agreements and our debt indenture and its supplements contain financial covenants that, among other things, restrict our ability to incur indebtedness and require us to maintain certain financial ratios and a minimum net worth. Our Board of Trustees may determine to seek additional capital through equity offerings, debt financings, retention of cash flows in excess of distributions to shareholders or a combination of these methods. Some of our properties are encumbered by mortgages. To the extent that our Board of Trustees decides to obtain additional debt financing, we may do so on an unsecured basis or a secured basis, subject to limitations in existing financing or other contractual arrangements; we may seek to obtain other lines of credit or to issue securities senior to our common and/or preferred shares, including preferred shares or debt securities which may be convertible into common shares or be accompanied by warrants to purchase common shares; or we may engage in transactions which involve a sale or other conveyance of properties to affiliated or unaffiliated entities. We may finance acquisitions by an exchange of properties, by borrowing under our credit facility, by assuming outstanding mortgage debt on the acquired properties, by the issuance of additional equity or debt securities or by using retained cash flow from operations which may exceed our earnings. The proceeds from any of our financings may be used to pay distributions, to provide working capital, to refinance existing indebtedness or to finance acquisitions and expansions of existing or new properties. We may from time to time re-evaluate and modify our financing policies in light of then current market conditions, relative availability and costs of debt and equity capital, the changing values of properties, growth and acquisition opportunities and other factors, and we may increase or decrease our ratio of debt to total capitalization.

Competition.    Investing in and operating office real estate is a highly competitive business. We compete against other REITs, numerous financial institutions, individuals and public and private companies who are actively engaged in this business. Also, we compete for tenants and investments based on a number of factors including pricing, underwriting criteria and reputation. Our ability to successfully compete is also impacted by economic and population trends, availability of acceptable investment opportunities, our ability to negotiate beneficial leasing and investment terms, availability and cost of capital and new and existing laws and regulations. Some of our competitors are dominant in selected geographic markets, including in markets in which we operate. Many of our competitors have greater financial and other resources than we have.

For additional information on competition and the risks associated with our business, please see "Risk Factors" in Part I, Item 1A of this Annual Report on Form 10-K.

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Environmental and Climate Change Matters.    Under various environmental, health and safety laws, owners and operators, including tenants of real estate may be subject to liabilities resulting from the presence of hazardous substances, waste or petroleum products at, on, under, or emanating from such property, including costs for investigating and remediating or removing hazardous substances present at or migrating from such properties, liabilities for property damage or personal injuries, natural resource damages, and costs and losses arising from property use restrictions or diminution in value. We, or our tenants, also may incur liability for failing to comply with environmental, health and safety laws. We do not believe that there are environmental conditions or issues at any of our properties that have had or will have a material adverse effect on us. However, no assurances can be given that conditions or issues are not present at our properties or that costs we may be required to incur in the future to remediate contamination or comply with environmental, health and safety laws will not have a material adverse effect on our business or financial condition.

We estimate the cost to remove hazardous substances or address environmental issues at some of our properties based in part on environmental surveys conducted on our properties.

Some of our properties have been or may be impacted by releases of hazardous substances or petroleum products. Such contamination may arise from a variety of sources, including historic uses of our properties for commercial or industrial purposes, spills of such materials at adjacent properties, or releases from tanks used on our properties to store petroleum or hazardous substances. In addition, certain of our properties are on sites upon which or are adjacent to or near other properties upon which others, including former owners or tenants, have engaged, or may in the future engage, in activities that may release petroleum products or other hazardous or toxic substances. Though we have reviewed these and our other properties for potential environmental liabilities, we cannot assure that we have identified all potential environmental liabilities.

Certain of our buildings contain asbestos. We believe any asbestos in our buildings is contained in accordance with current regulations. If we remove the asbestos or renovate or demolish these properties, certain environmental regulations govern the manner in which the asbestos must be handled and removed, which could result in increased costs.

For more information regarding environmental matters and their possible adverse impact on us, see "Risk Factors-Risks Related to Our Business-We could incur significant costs and liabilities with respect to environmental matters” in Part I, Item 1A.

The current political debate about climate change has resulted in various treaties, laws and regulations which are intended to limit carbon emissions. We believe these laws being enacted or proposed may cause energy costs at our properties to increase, but we do not expect the direct impact of these increases to be material to our results of operations because the increased costs either would be the responsibility of our tenants directly or in large part may be passed through by us to our tenants as additional lease payments. Although we do not believe it is likely in the foreseeable future, laws enacted to mitigate climate change may make some of our buildings obsolete or cause us to make material investments in our properties which could materially and adversely affect our financial condition. We continuously study ways to improve the energy efficiency at all of our properties. For more information regarding climate change matters and their possible adverse impact on us, see "Risk Factors—Risks Related to Our Business—We may be adversely affected by laws, regulations or other issues related to climate change" in Part I, Item 1A and "Management's Discussion and Analysis—Impact of Climate Change" in Part II, Item 7 of this Annual Report on Form 10-K.

Information About Geographic Areas

We owned assets in Australia prior to the sale of these assets in June 2015. As of December 31, 2014 and 2013, we had assets in Australia of $252.0 million and $285.1 million, respectively. For the years ended December 31, 2015, 2014 and 2013, we recognized revenues in Australia of $12.7 million, $30.1 million and $33.1 million, respectively.

Internet Website

Our internet website address is www.eqcre.com. Copies of our Corporate Governance Guidelines, Code of Business Conduct and Ethics, policy outlining procedures for handling concerns or complaints about accounting, internal accounting controls or auditing matters, and the charters of our Audit, Compensation and Nominating and Corporate Governance committees are posted on our website and may be obtained free of charge by writing to our Secretary, Equity Commonwealth, Two North Riverside Plaza, Suite 2100, Chicago, Illinois 60606. We make available, free of charge, on our website, our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to these reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, or the Exchange Act, as soon as reasonably practicable after these forms are filed with, or furnished to, the SEC. Any shareholder or other interested party who desires to communicate with our Board of Trustees, or our non-management Trustees, individually or as a group, may do so by filling out a report on our website. Our website address is included several times in this Annual Report on

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Form 10-K as a textual reference only and the information on the website is not incorporated by reference into this Annual Report on Form 10-K.

RISK FACTORS

Item 1A.    Risk Factors.

Our business faces many risks. The risks described below may not be the only risks we face but are the risks we know of that we believe may be material at this time. Additional risks that we do not yet know of, or that we currently think are immaterial, may also impair our business operations or financial results. If any of the events or circumstances described in the following risks occurs, our business, financial condition or results of operations could suffer and the trading price of our securities could decline. Investors and prospective investors should consider the following risks and the information contained under the heading "Forward Looking Statements" before deciding whether to invest in our securities.

Risks Related to Our Business

We may not be successful in repositioning our portfolio, which may reduce the size of our business and negatively affect our financial condition or results of operations.

Subsequent to our transition from external management to internal management in 2014, we undertook a comprehensive review of our portfolio and our operations and developed a strategy that focuses on reshaping our portfolio. We are in the process of executing this strategy and have completed 91 property dispositions totaling $2.0 billion through December 31, 2015, significantly reducing the size of our business. As of December 31, 2014, our portfolio included 156 properties (262 buildings) with a combined 42.9 million square feet for a total investment of $5.7 billion at cost, whereas as of December 31, 2015, our portfolio included 65 properties (127 buildings) with a combined 24.0 million square feet for a total investment of $3.9 billion at cost. In addition, we are pursuing additional dispositions, which we anticipate will further reduce the size of our business. As of December 31, 2015, we had $1.8 billion of cash on hand. Although we expect to reinvest the capital we have received from dispositions, we cannot provide any assurances that we will be successful. During the time that we are looking for reinvestment opportunities, our financial condition and results of operations may be materially and adversely affected. While we are looking for reinvestment opportunities, our operating income is likely to be reduced, which may adversely affect our results of operations or decrease amounts available to be distributed to shareholders. Prior to any investment of proceeds from our completed dispositions, the market price of our common shares may fluctuate or decrease as a result of investors’ perceptions of our ability to successfully capitalize on strategic opportunities in order to reposition our portfolio.

If we are unable to identify attractive opportunities to redeploy the capital received from dispositions pursuant to our disposition strategy, we may sell all of our remaining assets and wind down, liquidate or dissolve our Company, which may be a lengthy process, yield unexpected results and diminish or delay any potential distributions to our shareholders. 

We are seeking opportunities to reinvest capital received from dispositions, but we cannot provide any assurances that we will be successful in making such investments. We are actively evaluating various strategies and one possibility is to decide to sell all or substantially all of our remaining assets and liquidate or sell the Company. No such decision has been made as of the date of this filing and we cannot predict the timing of making any such decision. In the event of a wind down, liquidation or dissolution of the Company, holders of our common shares may not realize the return on investment expected at the time they purchased our common shares.

Our disposition strategy may be unsuccessful and may result in expenses and reputational harm.

A central element of our current business plan focuses on continuing to dispose of a significant number of our properties. We cannot be assured that we will be able to find attractive sale opportunities or that any sale will be completed in a timely manner, if at all. Our ability to continue to sell certain of our properties, and the prices we receive upon any such sales, may be negatively affected by many factors. In particular, these factors could arise from weakness in or the lack of an established market for a property, changes in the financial condition or prospects of prospective purchasers, a limited number of prospective purchasers in certain markets, increase in the cost of or lack of availability of debt, the number of competing properties on the market, a deterioration in current local, national or international economic conditions, and changes in laws, regulations or fiscal policies of jurisdictions in which the property is located. In addition, provisions of the Code relating to REITs may limit our ability to sell properties. See risk factor below “Risks Related to Our Taxation as a REIT- The tax on “prohibited transactions” may limit our ability to engage in transactions which would be treated as sales for U.S. federal income tax purposes.” For these reasons, we may be unable to sell certain of our properties for an extended period of time or at all, and our business plan to sell certain of our properties may not succeed and we may incur expenses and reputational harm.

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We may encounter unanticipated difficulties relating to acquisitions, which could undermine our business plan to acquire additional properties.

An element of our business plan involves the acquisition of additional properties as we are presented with attractive opportunities. Due to a number of factors, such as high asking prices for properties on the market, we may be unable to identify attractive acquisition opportunities. Additionally, we are likely to face competition for acquisition opportunities from other investors and this competition may adversely affect our ability to carry out our business strategy. In light of these challenges, we cannot be assured that we will be able to consummate attractive acquisition opportunities or that acquisitions we make will be successful.

We might encounter unanticipated difficulties and expenditures relating to any acquired properties. Newly acquired properties might require significant management attention that would otherwise be devoted to our ongoing business. We might never realize the anticipated benefits of our acquisitions. Notwithstanding pre-acquisition due diligence, we do not believe that it is possible to fully understand a property before it is owned and operated for an extended period of time. For example, we could acquire a property that contains undisclosed defects in design or construction. In addition, after our acquisition of a property, the market in which the acquired property is located may experience unexpected changes that adversely affect the property's value. The occupancy of properties that we acquire may decline during our ownership, and rents that are in effect at the time a property is acquired may decline thereafter. Also, our property operating costs for acquisitions may be higher than we anticipate and acquisitions of properties may not yield the returns we expect and, if financed using debt or new equity issuances, may result in shareholder dilution. For these reasons, among others, our business plan to acquire additional properties may not succeed or may cause us losses.

Our reliance upon CBRE, Inc., or CBRE, for third party property management may have a negative effect on our financial condition and results of operations.

We have engaged CBRE to provide property management services for substantially all of our properties pursuant to a master property management agreement. The successful operation and management of our properties requires significant coordination between us and CBRE. Additionally, upon the expiration of the initial term of our agreement with CBRE in September 2016, CBRE is permitted to terminate the property management agreement, as a whole or as to any one or more of our properties, without cause upon providing three months’ notice, and we are permitted to terminate the property management agreement, as a whole or as to any one or more of our properties, without cause upon 60 days’ notice. If we are unable to successfully coordinate with CBRE with respect to property management or the property management agreement with CBRE is terminated, in whole or in part, our operations could be disrupted, which may have a negative effect on our financial condition and results of operations.

We are currently dependent upon economic conditions relating to the commercial office real estate market, and adverse economic or regulatory developments in this market could materially and adversely affect our results of operations.

Our business is dependent upon the economic and regulatory environment (such as business layoffs or downsizing, industry slowdowns, relocations of businesses, increases in real estate and other taxes, costs of complying with governmental regulations or increased regulation). Such adverse developments could materially reduce the value of our real estate portfolio and our rental revenues, and thus materially and adversely affect our ability to service current debt and to pay distributions to shareholders. If economic conditions in our market worsen or fail to grow at a sufficient pace, we may experience reduced demand from tenants for our properties. A significant economic downturn in our market could adversely affect our results of operations.

Future impairment charges could have a material adverse effect on our results of operations in the period for which the charge occurs.

We periodically evaluate the recoverability of the carrying values of each of the real estate assets that comprise our portfolio. In undertaking our portfolio reviews, we comprehensively review our portfolio to evaluate whether there are any indicators, including property operating performance and general market conditions, that the value of the real estate properties (including any related amortizable intangible assets or liabilities) may not be recoverable. In 2014, we determined that due to the shortening of the expected periods of ownership of a number of our assets, as a result of the disposition plan, it was necessary to reduce the net book value of a portion of the real estate assets in our portfolio to their estimated fair values.  As a result, we recorded a loss on asset impairment for 34 properties of $167.1 million in 2014, to reflect the estimated fair values of those real estate assets in our portfolio that failed the recoverability test because their net book values exceeded their fair values.  We reduced the aggregate carrying value of these properties from $581.7 million to their estimated fair value of $414.6 million. We recorded a total impairment charge of $17.2 million during the year ended December 31, 2015, based upon updated market

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information in accordance with our impairment analysis procedures. There can be no assurance that we will not take additional charges in the future related to the impairment of our assets.

As part of the evaluation of our portfolio, we compare the current carrying value of the asset to the estimated undiscounted cash flows that are directly associated with the use and ultimate disposition of the asset. Our estimated cash flows are based on several key assumptions, including rental rates, costs of tenant improvements, leasing commissions, anticipated hold periods, and assumptions regarding the residual value upon disposition, including the exit capitalization rate. These key assumptions are subjective in nature and could differ materially from actual results. Additionally, changes in our disposition strategy or changes in the marketplace may alter the hold period of an asset or asset group, which may result in an impairment loss and such loss could be material to the Company's financial condition or operating performance. To the extent that the carrying value of the asset exceeds the estimated undiscounted cash flows, an impairment loss is recognized equal to the excess of carrying value over fair value. Any future impairment could have a material adverse effect on our results of operations in the period in which the charge is taken.

Additionally, the fair value of real estate assets is highly subjective and is determined through comparable sales information and other market data if available, or through use of an income approach such as the direct capitalization method or the discounted cash flow approach. Such cash flow projections consider factors, including expected future operating income, trends and prospects, as well as the effects of demand, competition and other factors, and therefore are subject to a significant degree of management judgment. In estimating the fair value of undeveloped land, we generally use market data and comparable sales information. These subjective assessments have a direct impact on our net income because recording an impairment charge results in an immediate negative adjustment to net income. Thus, our results of operations may be significantly affected by the subjective judgments of our management team as to the fair value of our properties.

If global market and economic conditions worsen or do not fully recover, our business, financial condition and results of operations could be adversely affected.

In the United States, market and economic conditions continue to be uncertain and challenging with modest growth. We are unable to predict with any certainty whether economic conditions will decline, remain stable or improve. If current economic conditions deteriorate, business layoffs, downsizing, industry slowdowns and other similar factors that affect our tenants could negatively impact commercial real estate fundamentals and result in lower occupancy, lower rental rates and declining values in our real estate portfolio. Additionally, the cost and availability of credit and the commercial real estate market generally may be adversely affected by persistent high levels of unemployment, insufficient consumer demand or confidence, the impacts of changes in the U.S. federal budgetary process, changes in regulatory environments and other macro-economic factors. Deteriorating economic conditions could also have an impact on our lenders or tenants, causing them to fail to meet their obligations to us. No assurances can be given that the current economic conditions will remain stable or improve, and if market and economic conditions weaken, our ability to lease our properties and increase or maintain rental rates may be affected, which would have a material adverse effect on our business, financial condition and results of operations.

Significant competition for tenants and acquisition opportunities may reduce rents and increase acquisition costs which could materially and adversely affect our company.

All of our properties face competition for tenants. Some competing properties may be newer, better located or more attractive to tenants. Competing owners may offer available space at lower rents than we offer at our properties. This competition may affect our ability to attract and retain tenants and may reduce the rents we are able to charge.

In addition, we face significant competition for acquisition opportunities from other investors, including publicly traded and private REITs, numerous financial institutions, individuals and public and private companies. Because of competition, we may be unable to, or may pay a significantly increased purchase price to, acquire a desired property. Some of our competitors may have greater financial and management resources than we do.

When we renew leases or lease to new tenants our rents may decline and our expenses may increase and changes in tenants' requirements for leased space may adversely affect us.

When we renew leases or lease to new tenants we may receive less rent than we currently receive. Market conditions may require us to lower our rents to retain tenants. When we lease to new tenants or renew leases we may have to spend substantial amounts for leasing commissions, tenant improvements or tenant inducements. Many of our leases are for properties that are specially suited to the particular business of our tenants. Because these properties have been designed or physically modified for a particular tenant, if the current lease is terminated or not renewed, we may be required to renovate the property at substantial costs, decrease the rent we charge or provide other concessions in order to lease the property to another tenant. In general, tenants have been seeking to increase their space utilization under their leases, including reducing the amount of square footage per employee at leased properties, which may reduce the demand for leased space. If a significant number of such

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events occur, our income and cash flow may materially decline and our ability to make regular distributions to our shareholders may be jeopardized.

We have substantial debt obligations which could materially and adversely affect our cost of operations.

As of December 31, 2015, we had $1.7 billion in debt outstanding, which was 32.6% of our total book capitalization. As a result, we are and expect to be subject to the risks normally associated with debt financing including:

• that interest rates may rise;

• that our cash flow will be insufficient to make required payments of principal and interest;

• that any refinancing will not be on terms as favorable as those of our existing debt;

• that required payments on mortgages and on our other debt are not reduced if the economic performance of any property declines;

• that debt service obligations will reduce funds available for distribution to our shareholders;

• that any default on our debt, due to noncompliance with financial covenants or otherwise, could result in acceleration of those obligations;

• that we may be unable to refinance or repay the debt as it becomes due, and

• that if our degree of leverage is viewed unfavorably by lenders or potential joint venture partners, it could affect our ability to obtain additional financing.

If we default in paying any of our debts or honoring our debt covenants, it may create one or more cross defaults, our debts may be accelerated and we could be forced to liquidate our assets for less than the values we would receive in a more orderly process. Additionally, we may not be able to refinance or repay debt as it becomes due which may force us to refinance or to incur additional indebtedness at higher rates and additional cost or, in the extreme case, to sell assets or seek protection from our creditors under applicable law.

Our failure or inability to meet certain terms of our credit agreement, which includes our unsecured revolving credit facility and term loans, may prevent us from making distributions to our shareholders.

Our credit agreement includes various conditions to borrowings and various financial and other covenants, including covenants requiring us to maintain certain minimum debt service coverage and maximum leverage ratios, and events of default. We may not be able to satisfy all of these conditions or may default on some of these covenants for various reasons, including matters which are beyond our control. If we are unable to borrow under our revolving credit facility, we may be unable to meet our business obligations or to grow by buying additional properties, or we may be required to sell some of our properties. If we default under our credit agreement, the lenders may demand immediate payment or elect not to make further borrowings available. Additionally, during the continuance of any event of default under our credit agreement, we will be limited or in some cases prohibited from making distributions on our shares. Any default under our credit agreement would likely have serious and adverse consequences to us and would likely cause the market price of our shares to materially decline.

In the future, we may obtain additional debt financing, and the covenants and conditions which apply to any such additional indebtedness may be more restrictive than the covenants and conditions contained in our current credit agreement.

Changes in capital markets may adversely affect the value of an investment in our shares.

Although interest rates remain below historical long term averages, interest rates have recently risen. Increases in interest rates may adversely affect us and the value of an investment in our shares, including in the following ways:

• Amounts outstanding under our credit agreement bear interest at variable interest rates. When interest rates increase, so will our interest costs, which could adversely affect our cash flow, ability to pay principal and interest on debt, cost of refinancing debt when it becomes due and ability to make or sustain distributions to our shareholders. Additionally, if we choose to hedge our interest rate risk, we cannot assure that the hedge will be effective or that our hedging counterparty will meet its obligations to us.

• An increase in interest rates could decrease the amount buyers may be willing to pay for our properties, thereby reducing the market value of our properties and limiting our ability to sell properties or to obtain mortgage financing secured by our properties. Increased interest rates may increase the cost of financing properties we acquire to the extent we utilize leverage for those acquisitions and may result in a reduction in our acquisitions to the extent we

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reduce the amount we offer to pay for properties, due to the effect of increased interest rates, to a price that sellers may not accept.

A lack of any limitation on our debt could result in our becoming more highly leveraged.

Our governing documents do not limit the amount of indebtedness we may incur. Furthermore, our note indenture and credit agreement permit us and our subsidiaries to incur additional debt, including secured debt. Accordingly, we may incur additional debt. We might become more highly leveraged as a result, and our financial condition, results of operations and cash available for distribution to shareholders might be negatively affected, and the risk of default on our indebtedness could increase.

We could become a party to legal proceedings, which could adversely affect our financial results and/or distract our Board of Trustees and management.

As noted below in Item 3 "Legal Proceedings," we recently settled a number of complaints against certain of our former officers and former Trustees who were named as defendants in a number of complaints seeking monetary damages and declaratory and injunctive relief. Additional claims may be filed against us in connection with any action we may or may not take, including any equity or debt financing we may undertake, any sales of our assets, past and future amendments to our bylaws, our former Trustees' response to actions by our shareholders or others and other actions by our former Trustees or by us. The results of litigation are difficult to predict and we can provide no assurance that our legal conclusions or positions will be upheld. Moreover, claims of this nature present a risk of protracted litigation, incurrence of significant attorneys' fees, costs and expenses, and diversion of management's attention from the operation of our business. In addition, we have agreed to indemnify our present or former Trustees or officers who are made or threatened to be made parties to a legal proceeding by reason of their service in that capacity, which may be costly. Adverse rulings in any such legal proceedings could have a material adverse effect on our financial results and condition and cause substantial reputational harm and/or a decline in the market price of our shares.

We could incur significant costs and liabilities with respect to environmental matters.

Under various federal, state and local laws and regulations, as the current or former owners or operators of real estate, we may be liable for costs and damages resulting from the presence or release of hazardous substances, including waste or petroleum products, at, on, in, under or from such property, including costs for investigation, removal or remediation of such contamination and for natural resource damages arising from such contamination. Such laws often impose liability without regard to whether the owner or operator knew of, or was responsible for, the presence of such contamination, and the liability may be joint and several. In addition, the presence of contamination or the failure to remediate contamination at our properties may expose us to third-party liability for costs of remediation and/or personal or property damage, adversely affect our ability to lease, sell or rent such property, or adversely affect our ability to borrow using such property as collateral. Environmental laws may create liens on contaminated sites in favor of the government for damages and costs it incurs to address such contamination. If contamination is discovered on our properties, environmental laws also may impose restrictions on the manner in which those properties may be used or businesses may be operated, and these restrictions may require significant expenditures. Additionally, we may remain responsible for costs and liabilities arising from environmental issues related to representations and warranties we make in sales agreements for properties of which we have disposed. We also may be liable for the costs of removal or remediation of hazardous substances or waste at disposal or treatment facilities if we arranged for disposal or treatment of hazardous substances at such facilities, whether or not we own or operate such facility.

Some of our properties have been or may be impacted by releases of hazardous substances or petroleum products. Such contamination may arise from a variety of sources, including historic uses of our properties for commercial or industrial purposes, spills of such materials at adjacent properties, or releases from tanks used on our properties to store petroleum or hazardous substances. In addition, certain of our properties are on sites upon which or are adjacent to or near other properties upon which others, including former owners or tenants, have engaged, or may in the future engage, in activities that may release petroleum products or other hazardous or toxic substances.

We, our tenants, and our properties are subject to various federal, state and local regulatory requirements related to environmental, health and safety matters, such as environmental laws, state and local fire and safety requirements, building codes and land use regulations. Failure to comply with these requirements could subject us or our tenants to governmental fines or private litigant damage awards. In addition, compliance with these requirements, including new requirements or stricter interpretation of existing requirements, may require us or our tenants to incur significant expenditures. We do not know whether existing requirements will change or whether future requirements, including any requirements that may emerge from pending or future climate change laws or regulations, will develop. Environmental noncompliance liability also could impact a tenant’s ability to make rental payments to us, and our reputation could be negatively affected if we or our tenant’s violate environmental laws or regulations.

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Buildings and other structures on properties that we currently or formerly own or operate or those we acquire or operate in the future contain, may contain, or may have contained, asbestos-containing material (or ACM). Environmental, health and safety laws require that ACM be properly managed and maintained, and include requirements to undertake special precautions, such as removal or abatement, if ACM would be disturbed during maintenance, renovation, or demolition of a building, potentially resulting in substantial costs. Moreover, laws regarding ACM may impose fines and penalties on owners, employers and operators, and we may be subject to liability for releases of ACM into the air and third parties may seek recovery from owners or operators of real property for personal injury associated with ACM.

When excessive moisture accumulates in buildings or on building materials, mold growth may occur, particularly if the moisture problem remains undiscovered or is not addressed over a period of time. Some molds may produce airborne toxins or irritants. Indoor air quality issues also can stem from inadequate ventilation, chemical contamination from indoor or outdoor sources, and other biological contaminants such as pollen, viruses and bacteria. Indoor exposure to airborne toxins or irritants above certain levels can be alleged to cause a variety of adverse health effects and symptoms, including allergic or other reactions. The presence of mold or other airborne contaminants in our buildings could expose us to costs and liabilities to address these issues, including from third parties if property damage or personal injury occurs.

We may be adversely affected by laws, regulations or other issues related to climate change.

If we become subject to laws or regulations related to climate change, our business, results of operations and financial condition could be impacted adversely. The federal government has enacted, and some of the states and localities in which we operate may enact certain climate change laws and regulations or have begun regulating carbon footprints and greenhouse gas emissions. Although these laws and regulations have not had any known material adverse effects on our business to date, they could result in substantial costs, including compliance costs, increased energy costs, retrofit costs and construction costs, including monitoring and reporting costs, and capital expenditures for environmental control facilities and other new equipment. Furthermore, our reputation could be negatively affected if we violate climate change laws or regulations. We cannot predict how future laws and regulations, or future interpretations of current laws and regulations, related to climate change will affect our business, results of operations and financial condition. Lastly, the potential physical impacts of climate change on our operations are highly uncertain, and would be particular to the geographic circumstances in areas in which we operate. These may include changes in rainfall and storm patterns and intensities, water shortages, changing sea levels and changing temperatures. These impacts may adversely affect our business, financial condition and results of operations. For more information regarding climate change matters and their possible adverse impact on us, please see "Management's Discussion and Analysis—Impact of Climate Change" in Part II, Item 7 of this Annual Report on Form 10-K.

We rely on information technology in our operations, and any material failure, inadequacy, interruption or security failure of that technology could harm our business.

We rely on information technology networks and systems, including the Internet, to process, transmit and store electronic information and to manage or support a variety of our business processes, including financial transactions and maintenance of records, which may include personal identifying information of tenants and lease data. We rely on commercially available systems, software, tools and monitoring to provide security for processing, transmitting and storing confidential tenant information, such as individually identifiable information relating to financial accounts. As our reliance on technology has increased, so have the risks posed to our systems, both internal and those we have outsourced to third party service providers. In addition, information security risks have generally increased in recent years due to the rise in new technologies and the increased sophistication and activities of perpetrators of cyber attacks. Although we have taken steps to protect the security of the data maintained in our information systems, it is possible that our security measures will not be able to prevent the systems' improper functioning, or the improper disclosure of personally identifiable information such as in the event of cyber attacks. Security breaches, including physical or electronic break-ins, computer viruses, attacks by hackers and similar breaches, can create system disruptions, shutdowns or unauthorized disclosure of confidential information. Any failure to maintain proper function, security and availability of our information systems could interrupt our operations, damage our reputation, subject us to liability claims or regulatory penalties and could materially and adversely affect us.

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Risks Related to the Real Estate Industry

Real estate ownership creates risks and liabilities that could have a material adverse effect on us, including our results of operations and financial condition.

Our economic performance and the value of our real estate assets, and consequently the value of our securities, are subject to risks inherently associated with real estate ownership, including:

• changes in supply of or demand for our properties or customers for such properties in areas in which we own buildings;

• the illiquid nature of real estate markets, which limits our ability to sell our assets rapidly or to respond to changing market conditions;

• the subjectivity of real estate valuations and changes in such valuations over time;

• property and casualty losses;

• the ongoing need for property maintenance and repair, and the need to make expenditures due to changes in governmental regulations, including the Americans with Disabilities Act;

• the inability of tenants to pay rent;

• competition from the development of new properties in the markets in which we own property and the quality of such competition, such as the attractiveness of our properties as compared to our competitors' properties based on considerations such as convenience of location, rental rates, amenities and safety record;

• civil unrest, acts of war, acts of God, including earthquakes, hurricanes and other natural disasters (which may result in uninsured losses), and other factors beyond our control;

• legislative, tax and regulatory developments that may occur at the federal, state and local levels that have direct or indirect impact on the ownership, leasing and operation of our properties; and

• litigation incidental to our business.

If any of the foregoing events occur, our properties may not generate revenues sufficient to meet our operating expenses, including debt service and capital expenditures, and our cash flow and ability to pay distributions to our shareholders will be adversely affected.

Potential losses may not be covered by insurance exposing us to potential risk of loss.

We do not carry insurance for generally uninsurable losses such as loss from riots, war or acts of God, and, in some cases, flooding. Some of our policies, such as those covering losses due to terrorism, hurricanes, earthquakes and floods, are insured subject to limitations involving large deductibles or co-payments and policy limits that may not be sufficient to cover all losses. If we experience a loss that is uninsured or that exceeds policy limits, we could lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. Inflation, changes in building codes and ordinances, environmental considerations, and other factors also might make it impractical or undesirable to use insurance proceeds to replace a property after it has been damaged or destroyed. In addition, if the damaged properties are subject to recourse indebtedness, we would continue to be liable for the indebtedness, even if these properties were irreparably damaged.

Insurance coverage on our properties may be expensive or difficult to obtain, exposing us to potential risk of loss.

In the future, we may be unable to renew or duplicate our current insurance coverage at adequate levels or at reasonable prices. In addition, insurance companies may no longer offer coverage against certain types of losses, such as losses due to terrorist acts, environmental liabilities, or other catastrophic events including hurricanes and floods, or, if offered, the expense of obtaining these types of insurance may not be justified. We therefore may cease to have insurance coverage against certain types of losses and/or there may be decreases in the limits of insurance available. If an uninsured loss or a loss in excess of our insured limits occurs, we could lose all or a portion of the capital we have invested in a property, as well as the anticipated future revenue from the property after a covered period of time, but still remain obligated for any mortgage debt or other financial obligations related to the property. We cannot guarantee that material losses in excess of insurance proceeds will not occur in the future. If any of our properties were to experience a catastrophic loss, it could seriously disrupt our operations, delay revenue and result in large expenses to repair or rebuild the property. Events such as these could adversely affect our results of operations and our ability to meet our obligations.

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Actual or threatened terrorist attacks may adversely affect our ability to generate revenues and the value of our properties.

We have significant investments in large metropolitan markets that have been or may be in the future the targets of actual or threatened terrorism attacks. As a result, some tenants in these markets may choose to relocate their businesses to other markets or to lower-profile office buildings within these markets that may be perceived to be less likely targets of future terrorist activity. This could result in an overall decrease in the demand for office space in these markets generally or in our properties in particular, which could increase vacancies in our properties or necessitate that we lease our properties on less favorable terms or both. In addition, future terrorist attacks in these markets could directly or indirectly damage our properties, both physically and financially, or cause losses that materially exceed our insurance coverage. As a result of the foregoing, our ability to generate revenues and the value of our properties could decline materially.

Changes in accounting pronouncements may materially and adversely affect our financial statements, our tenants’ credit quality and our ability to secure long-term leases and renewal options.

Accounting policies and methods are fundamental to how we record and report our financial condition and results of operations. Uncertainties posed by various initiatives of accounting standard-setting by the Financial Accounting Standards Board and the Securities and Exchange Commission, which create and interpret applicable accounting standards for U.S. companies, may change the financial accounting and reporting standards or their interpretation and application of these standards that govern the preparation of our financial statements. These changes could have a material impact on our reported financial condition and results of operations. In some cases, we could be required to apply a new or revised standard retroactively, resulting in potentially material restatements of prior period financial statements. Similarly, these changes could have a material impact on our tenants’ reported financial condition or results of operations or could affect our tenants’ preferences regarding leasing real estate.

The Financial Accounting Standards Board has proposed accounting rules that would require companies to capitalize all leases on their balance sheets by recognizing a lessee's rights and obligations. If such a proposal is adopted, many companies that account for certain leases on an "off balance sheet" basis would be required to account for such leases "on balance sheet." This change would remove many of the differences in the way companies account for owned property and leased property, and could have a material effect on various aspects of our tenants' businesses, including their credit quality and the factors they consider in deciding whether to own or lease properties. If the proposal is adopted, it could cause companies that lease properties to prefer shorter lease terms, in an effort to reduce the leasing liability required to be recorded on their balance sheets. The proposal could also make lease renewal options less attractive, as, under certain circumstances, the rule would require a tenant to assume that a renewal right will be exercised and accrue a liability relating to the longer lease term.

Risks Related to Our Securities

We cannot assure that we will make distributions to our shareholders, and distributions we may make may include a return of capital.

Any distributions will be made at the discretion of our Board of Trustees and will depend upon various factors that our Board of Trustees deems relevant, including, but not limited to, our results of operations, our financial condition, debt and equity capital available to us, our expectations of our future capital requirements and operating performance, including our funds from operations, or FFO, our normalized funds from operations, or Normalized FFO, and our cash available for distribution, restrictive covenants in our financial or other contractual arrangements (including those in our credit agreement and senior notes indenture), tax law requirements to maintain our status as a REIT, restrictions under Maryland law and our expected needs and availability of cash to pay our obligations or to fund our acquisitions strategy. Our making of distributions is subject to compliance with restrictions contained in our credit agreement and our debt indenture. Additionally, our ability to make distributions will be adversely affected if any of the risks described herein, or other significant adverse events, occur. For these reasons, among others, our distribution rate may decline or we may cease making distributions. Also, our distributions may include a return of capital. As a result of the taxable losses recognized on property sales in 2015 and the net operating loss carryforward from 2014, a distribution to common shareholders will not be required for 2015. There can be no assurance that we will pay distributions in the future.

Changes in market conditions could adversely affect the market price of our common shares.

As with other publicly traded equity securities, the value of our common shares depends on various market conditions that may change from time-to-time. Among the market conditions that may affect the value of our common shares are the following:

• the extent of investor interest in our securities;

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• the general reputation of REITs and the attractiveness of our equity securities in comparison to other equity securities, including securities issued by other real estate-based companies;

• our underlying asset value;

• national and global economic conditions;

• changes in tax laws;

• our financial performance;

• changes in our credit ratings; and

• general stock and bond market conditions.

The market value of our common shares is based primarily upon the market’s perception of our growth potential and our current and potential future earnings and cash dividends. Consequently, our common shares may trade at prices that are greater or less than our net asset value per share of common shares. If our future earnings or cash dividends are less than expected, it is likely that the market price of our common shares will diminish.

Any notes we may issue will be effectively subordinated to the debts of our subsidiaries and our secured debt.

We conduct substantially all of our business through, and substantially all of our properties are owned by, our subsidiaries. Consequently, our ability to pay debt service on our outstanding notes and any notes we issue in the future will be dependent upon the cash flow of our subsidiaries and payments by those subsidiaries to us as dividends or otherwise. Our subsidiaries are separate legal entities and have their own liabilities. Payments due on our outstanding notes, and any notes we may issue, are, or will be, effectively subordinated to liabilities of our subsidiaries, including guaranty liabilities. As of December 31, 2015, our subsidiaries had $249.7 million of debt. Our outstanding notes are, and any notes we may issue will be, effectively subordinated to any secured debt with regard to our assets pledged to secure those debts.

Our notes may permit redemption before maturity, and our noteholders may be unable to reinvest proceeds at the same or a higher rate.

The terms of our notes may permit us to redeem all or a portion of our outstanding notes after a certain amount of time, or up to a certain percentage of the notes prior to certain dates. Generally, the redemption price will equal the principal amount being redeemed, plus accrued interest to the redemption date, plus any applicable premium. If a redemption occurs, our noteholders may be unable to reinvest the money they receive in the redemption at a rate that is equal to or higher than the rate of return on the applicable notes.

There may be no public market for notes we may issue and one may not develop.

Generally, any notes we may issue will be a new issue for which no trading market currently exists. We may not list our notes on any securities exchange or seek approval for price quotations to be made available through any automated quotation system. We cannot assure that an active trading market for any of our notes will exist in the future. Even if a market develops, the liquidity of the trading market for any of our notes and the market price quoted for any such notes may be adversely affected by changes in the overall market for fixed income securities, by changes in our financial performance or prospects, or by changes in the prospects for REITs or for the real estate industry generally.

The number of our common shares available for future issuance or sale could adversely affect the per share trading price of our common shares and may be dilutive to current shareholders.

Our declaration of trust authorizes our Board of Trustees to, among other things, issue additional shares of capital stock without stockholder approval. We cannot predict whether future issuances or sales of our common shares or the availability of shares for resale in the open market will decrease the per share trading price per share of our common shares. The issuance of substantial numbers of our common shares in the public market, or upon conversion of our Series D preferred shares, or the perception that such issuances might occur, could adversely affect the per share trading price of our common shares. In addition, we may issue our common shares or restricted share units under the Equity Commonwealth 2015 Omnibus Incentive Plan. Any such future issuances of our common shares may be dilutive to existing shareholders.

Rating agency downgrades or rising interest rates may increase our cost of capital.

Our senior notes and our preferred shares are rated by two rating agencies. These rating agencies may elect to downgrade their ratings on our senior notes and our preferred shares at any time. Such downgrades may negatively affect our access to the capital markets and increase our cost of capital, including the interest rate and fees payable under our credit agreement. In addition, rising interest rates may adversely impact our ability to access the capital markets.

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Conversion of our series D preferred shares may dilute the ownership interests of existing shareholders.

The conversion of some or all of our series D preferred shares may dilute the ownership interests of existing shareholders.

Risks Related to Our Organization and Structure

Ownership limitations and certain provisions in our declaration of trust and bylaws, as well as certain provisions of Maryland law, may deter, delay or prevent a change in our control or unsolicited acquisition proposals.

Our declaration of trust and bylaws prohibit any shareholder other than certain persons who have been exempted by our Board of Trustees from owning (directly and by attribution) more than 9.8% of the number or value of shares of any class or series of our outstanding shares of beneficial interest, including our common shares. These provisions are intended to assist with our REIT compliance under the Code and otherwise promote our orderly governance. However, these provisions also inhibit acquisitions of a significant stake in us and may deter, delay or prevent a change in our control or unsolicited acquisition proposals that a shareholder may consider favorable.

Additionally, provisions contained in our declaration of trust and bylaws or under Maryland law may have a similar impact, including, for example, provisions relating to: the authority of our Board of Trustees, and not our shareholders, to adopt, amend and repeal our bylaws and to fill most vacancies on our Board of Trustees; the fact that only the Chairman of the Board of Trustees, our Chief Executive Officer, our President, a majority of our Trustees or the holders of 10% of our common shares may call a special meeting of shareholders; and advance notice requirements for shareholder proposals.

Furthermore, our Board of Trustees has the authority to create and issue new classes or series of shares (including shares with voting rights and other rights and privileges that may deter a change in control) and issue additional common shares. The authorization and issuance of a new class of capital stock or additional common shares could have the effect of delaying or preventing someone from taking control of us, even if a change in control were in our shareholders' best interests.

Certain provisions of Maryland law could inhibit changes in control.

Certain provisions of Maryland law may have the effect of inhibiting a third party from making a proposal to acquire us or of impeding a change of control under circumstances that otherwise could provide the holders of our common shares with the opportunity to realize a premium over the then-prevailing market price of such shares, including:

• “business combination moratorium/fair price” provisions that, subject to limitations, prohibit certain business combinations between us and an “interested shareholder” (defined generally as any person who beneficially owns 10% or more of the voting power of our shares or an affiliate thereof) for five years after the most recent date on which the shareholder becomes an interested shareholder, and thereafter imposes stringent fair price and super-majority shareholder voting requirements on these combinations; and

• “control share” provisions that provide that “control shares” of our company (defined as shares which, when aggregated with other shares controlled by the shareholder, entitle the shareholder to exercise one of three increasing ranges of voting power in electing trustees) acquired in a “control share acquisition” (defined as the direct or indirect acquisition of ownership or control of “control shares” from a party other than the issuer) have no voting rights except to the extent approved by our shareholders by the affirmative vote of at least two thirds of all the votes entitled to be cast on the matter, excluding all interested shares, and are subject to redemption in certain circumstances.

We have opted out of these provisions of Maryland law. However, our Board of Trustees may opt to make these provisions applicable to us at any time without obtaining shareholder approval.

Our recourse against Trustees and officers may be limited by the limited rights granted to our shareholders in our declaration of trust.

Our declaration of trust limits the liability of our Trustees and officers to us and our shareholders for money damages to the maximum extent permitted under Maryland law. Under current Maryland law, our Trustees and officers will not have any liability to us and our shareholders for money damages other than liability resulting from:

• actual receipt of an improper benefit or profit in money, property or services; or

• active and deliberate dishonesty by the Trustee or officer that was established by a final judgment as being material to the cause of action adjudicated.

Our declaration of trust and bylaws require us to indemnify any present or former Trustee or officer, to the maximum extent permitted by Maryland law, who is made or threatened to be made a party to a proceeding by reason of his or her service in that capacity. In addition, we may be obligated to pay or reimburse the expenses incurred by our present and former Trustees

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and officers without requiring a preliminary determination of their ultimate entitlement to indemnification. As a result, we and our shareholders may have more limited rights against our present and former Trustees and officers than might otherwise exist absent the provisions in our declaration of trust and bylaws or that might exist with other companies, which could limit your recourse in the event of actions not in your best interest.

Shareholder litigation against us or our Trustees and officers may be referred to binding arbitration proceedings which may increase our risk of default.

Our bylaws provide that actions by our shareholders against us or against our Trustees and officers, including derivative and class actions, may be referred to binding arbitration proceedings. As a result, our shareholders would not be able to pursue litigation for these disputes in courts against us or our Trustees and officers if the disputes were referred to arbitration. In addition, the ability to collect attorneys' fees or other damages may be limited, which may discourage attorneys from agreeing to represent parties wishing to commence such a proceeding.

We may change our operational, financing and investment policies without shareholder approval and we may become more highly leveraged, which may increase our risk of default under our debt obligations.

Our Board of Trustees determines our operational, financing and investment policies and may amend or revise our policies, including our policies with respect to our intention to qualify for taxation as a REIT, acquisitions, dispositions, growth, operations, indebtedness, capitalization and distributions, or approve transactions that deviate from these policies, without a vote of, or notice to, our shareholders. Policy changes could adversely affect the market value of our common shares and our ability to make distributions to our shareholders. Further, our organizational documents do not limit the amount or percentage of indebtedness, funded or otherwise, that we may incur. Our Board of Trustees may alter or eliminate our current policy on borrowing at any time without shareholder approval. If this policy changed, we could become more highly leveraged, which could result in an increase in our debt service costs. Higher leverage also increases the risk of default on our obligations. In addition, a change in our investment policies, including the manner in which we allocate our resources across our portfolio or the types of assets in which we seek to invest, may increase our exposure to interest rate risk, real estate market fluctuations and liquidity risk.

Risks Related to Our Taxation as a REIT

Qualifying as a REIT involves highly technical and complex provisions of the Code.

Qualification as a REIT involves the application of highly technical and complex Code provisions for which only limited judicial and administrative authorities exist. Even a technical or inadvertent violation could jeopardize our REIT qualification. Our qualification as a REIT depends on our satisfaction of certain asset, income, organizational, distribution, stockholder ownership and other requirements on a continuing basis. We have owned direct or indirect interests in one or more REITs (each, a "Subsidiary REIT") that have elected to be taxed as REITs under the U.S. federal income tax laws. Each Subsidiary REIT is subject to the various REIT qualification requirements and other limitations described herein that are applicable to us. If a Subsidiary REIT were to fail to qualify as a REIT, then (i) that Subsidiary REIT would become subject to U.S. federal income tax, (ii) our ownership of shares in such Subsidiary REIT would cease to be a qualifying asset for purposes of the asset tests applicable to REITs, and (iii) it is possible that we would fail certain of the asset tests applicable to REITs, in which event we would fail to qualify as a REIT unless we could avail ourselves of certain relief provisions. While we believe that the Subsidiary REITs have qualified as REITs under the Code, we have joined each Subsidiary REIT in filing a protective taxable REIT subsidiary election under Section 856(l) of the Code for each taxable year in which we have owned an interest in the Subsidiary REIT. Pursuant to the protective taxable REIT subsidiary election, we believe that even if a Subsidiary REIT was not a REIT for some reason, then it would instead have been considered one of our taxable REIT subsidiaries. As one of our taxable REIT subsidiaries, we believe that a Subsidiary REIT’s failure to qualify as a REIT would not jeopardize our own qualification as a REIT, even if we owned more than 10% of the Subsidiary REIT.

New legislation, court decisions or administrative guidance, in each case possibly with retroactive effect, may make it more difficult or impossible for us to qualify as a REIT. Certain rules applicable to REITs are particularly difficult to interpret or to apply in the case of REITs investing in real estate mortgage loans that are acquired at a discount, subject to work-outs or modifications, or reasonably expected to be in default at the time of acquisition. In addition, our ability to satisfy the requirements to qualify as a REIT depends in part on the actions of third parties over which we have no control or only limited influence, including in cases where we own an equity interest in an entity that is classified as a partnership for U.S. federal income tax purposes.

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If we do not qualify as a REIT or fail to remain qualified as a REIT, we will be subject to U.S. federal income tax and potentially to additional state and local taxes which would reduce the amount of cash available for distribution to our shareholders.

We believe that we have been organized and have operated, and will continue to be organized and to operate, in a manner to allow us to qualify us to be taxed under the Code as a REIT. However, we cannot be certain that, upon review or audit, the IRS will agree with this conclusion. Furthermore, Congress and the IRS might make changes to the tax laws and regulations, and the courts might issue new rulings, that make it more difficult, or impossible, for us to remain qualified as a REIT. We do not intend to request a ruling from the IRS as to our REIT qualification.

As a REIT, we generally do not pay U.S. federal income tax on our net income that we distribute currently to our shareholders. However, actual qualification as a REIT under the Code depends on satisfying complex statutory requirements, for which there are only limited judicial and administrative interpretations. Many of the REIT requirements, however, are highly technical and complex. The determination that we are a REIT requires an analysis of various factual matters and circumstances that may not be totally within our control. For example, to qualify as a REIT, at least 95% of our gross income must come from specific passive sources, such as rent, that are itemized in the REIT tax laws. In addition, to qualify as a REIT, we cannot own specified amounts of debt and equity securities of some issuers. We also are required to distribute to our shareholders with respect to each year at least 90% of our “REIT taxable income” (determined before the deduction for dividends paid and excluding net capital gains). Even a technical or inadvertent mistake could jeopardize our REIT status and, given the highly complex nature of the rules governing REITs and the ongoing importance of factual determinations, we cannot provide any assurance that we will continue to qualify as a REIT.

If we fail to qualify as a REIT for U.S. federal income tax purposes, and are unable to avail ourselves of certain savings provisions set forth in the IRC, we likely would be subject to U.S. federal income tax at regular corporate rates. As a taxable corporation, we would not be allowed to take a deduction for distributions to shareholders in computing our taxable income or pass through long term capital gains to individual shareholders at favorable rates. We also could be subject to the U.S. federal alternative minimum tax and possibly increased state and local taxes. We would not be able to elect to be taxed as a REIT for four years following the year we first failed to qualify unless the IRS were to grant us relief under certain statutory provisions. If we failed to qualify as a REIT, we likely would have to pay significant income taxes, which likely would reduce our net earnings available for investment or distribution to our shareholders. If we fail to qualify as a REIT, such failure would cause us to be in breach under our credit agreement, and may adversely affect our ability to raise capital and to service our debt.  This likely would have a significant adverse effect on our earnings and the value of our securities. In addition, we would no longer be required to pay any distributions to shareholders. If we fail to qualify as a REIT for U.S. federal income tax purposes and are able to avail ourselves of one or more of the statutory savings provisions in order to maintain our REIT status, we would nevertheless be required to pay penalty taxes of $50,000 or more for each such failure.

Distributions to shareholders generally do not qualify for the preferential tax rates available for some dividends.

Dividends payable by U.S. corporations to noncorporate shareholders, such as individuals, trusts and estates, are generally eligible for reduced tax rates. Distributions paid by REITs, however, generally are not eligible for these reduced rates. Although this does not adversely affect the taxation of REITs or dividends payable by REITs, to the extent that the preferential rates continue to apply to regular corporate qualified dividends, the more favorable rates for corporate dividends may cause investors who are individuals, trusts and estates to perceive that an investment in a REIT is less attractive than an investment in a non-REIT entity that pays dividends, thereby reducing the demand and market price of our shares.

REIT distribution requirements could adversely affect our ability to execute our business plan.

We generally must distribute annually at least 90% of our “REIT taxable income” (determined before the deduction for dividends paid and excluding net capital gains) in order for U.S federal corporate income tax not to apply to earnings that we distribute. To the extent that we satisfy this distribution requirement, but distribute less than 100% of our taxable income, we will be subject to U.S. federal corporate income tax on our undistributed taxable income. We intend to make distributions to our shareholders to comply with the REIT requirements of the IRC. In addition, we will be subject to a 4% nondeductible excise tax if the actual amount that we pay out to our shareholders in a calendar year is less than a minimum amount specified under U.S. federal tax laws. We intend to make distributions to our shareholders to comply with the REIT requirements of the Code.

From time to time, we may generate taxable income greater than our income for financial reporting purposes prepared in accordance with U.S. generally accepted accounting principles, or GAAP, or differences in timing between the recognition of taxable income and the actual receipt of cash may occur. If we do not have other funds available in these situations we could be required to (i) borrow funds on unfavorable terms, (ii) sell investments at disadvantageous prices, (iii) distribute amounts that would otherwise be invested in future acquisitions, or (iv) make a taxable distribution of our common shares as part of a distribution in which shareholders may elect to receive our common shares or (subject to a limit measured as a percentage of

15

the total distribution) cash to make distributions sufficient to enable us to pay out enough of our taxable income to satisfy the REIT distribution requirement. These alternatives could increase our costs or reduce our shareholders' equity. Thus, compliance with the REIT requirements may hinder our ability to grow, which could adversely affect the value of our shares.

Even if we qualify and remain qualified as a REIT, we may face other tax liabilities that reduce our cash flow.

Even if we qualify and remain qualified for taxation as a REIT, we may be subject to certain U.S. federal, state and local taxes on our income and assets, including taxes on any undistributed income, excise taxes, state or local income, property and transfer taxes, such as mortgage recording taxes, and other taxes. We are subject to U.S. federal and state income tax (and any applicable non-U.S. taxes) on the net income earned by our taxable REIT subsidiaries. Moreover, if we have net income from “prohibited transactions,” that income will be subject to a 100% tax. Finally, some state and local jurisdictions may tax some of our income even though as a REIT we are not subject to U.S. federal income tax on that income because not all states and localities treat REITs the same way they are treated for federal U.S. income tax purposes. To the extent that we and our affiliates are required to pay federal, state and local taxes, we will have less cash available for distributions to our shareholders.

Complying with REIT requirements may force us to forgo and/or liquidate otherwise attractive investment opportunities.

To qualify as a REIT, we must ensure that we meet the REIT gross income tests annually and that at the end of each calendar quarter, at least 75% of the value of our assets consists of cash, cash items, government securities and qualified REIT real estate assets. The remainder of our investment in securities (other than government securities and qualified real estate assets) generally cannot include more than 10% of the outstanding voting securities of any one issuer or more than 10% of the total value of the outstanding securities of any one issuer. In addition, in general, no more than 5% of the value of our assets (other than government securities and qualified real estate assets) can consist of the securities of any one issuer, no more than 25% (20% for taxable years beginning after December 31, 2017) of the value of our total securities can be represented by securities of one or more TRSs and, effective for our taxable year that began on January 1, 2016 and all future taxable years, no more than 25% of the value of our assets can be represented by debt instruments issued by “publicly offered REITs.” If we fail to comply with these requirements at the end of any calendar quarter, we must correct the failure within 30 days after the end of the calendar quarter or qualify for certain statutory relief provisions to avoid losing our REIT qualification and suffering adverse tax consequences. As a result, we may be required to liquidate from our portfolio, or contribute to a TRS, otherwise attractive investments in order to maintain our qualification as a REIT. These actions could have the effect of reducing our income, increasing our income tax liability, and reducing amounts available for distribution to our stockholders. In addition, we may be required to make distributions to shareholders at disadvantageous times or when we do not have funds readily available for distribution, and may be unable to pursue investments (or, in some cases, forego the sale of such investments) that would be otherwise advantageous to us in order to satisfy the source-of-income or asset-diversification requirements for qualifying as a REIT. Thus, compliance with the REIT requirements may hinder our ability to make, and, in certain cases, maintain ownership of certain attractive investments.

The tax on “prohibited transactions” may limit our ability to engage in transactions which would be treated as sales for U.S. federal income tax purposes.

A REIT’s net income from prohibited transactions is subject to a 100% tax. In general, prohibited transactions are sales or other dispositions of property, other than foreclosure property, held primarily for sale to customers in the ordinary course of business. Our Trustees have approved a plan to reposition our portfolio to dispose of assets that have one or more of the following attributes: (i) we do not see an apportunity to create a competitive advantage, (ii) smaller assets, (iii) assets that are not office buildings (iv) assets that are not located in the United States, or (v) assets that produce a low cash yield or require significant capital expenditures. We believe that the dispositions related to the repositioning of our portfolio along with other dispositions that we have made or that we might make in the future will not be subject to the 100% penalty tax; however, because application of the prohibited transactions tax could be based on an analysis of all of the facts and circumstances, there can be no assurance that the gains on our prior real estate sales have not, or any future real estate sales will not, be subject to the 100% prohibited transaction tax.

Our ownership of TRSs has been and will continue to be limited and our transactions with our TRSs will cause us to be subject to a 100% penalty tax on certain income or deductions if those transactions are not conducted on arm’s length terms.

A REIT may own up to 100% of the stock of one or more TRSs. A TRS may hold assets and earn income that would not be qualifying assets or income if held or earned directly by a REIT. Both the subsidiary and the REIT must jointly elect to treat the subsidiary as a TRS. A corporation of which a TRS directly or indirectly owns more than 35% of the voting power or value

16

of the stock will automatically be treated as a TRS. Overall, no more than 25% (20% for taxable years beginning after December 31, 2017) of the value of a REIT’s assets may consist of stock or securities of one or more TRSs. In addition, the TRS rules limit the deductibility of interest paid or accrued by a TRS to its parent REIT to assure that the TRS is subject to an appropriate level of corporate taxation. The rules also impose a 100% excise tax on certain transactions between a TRS and its parent REIT that are not conducted on an arm’s length basis.

TRSs that we have formed have paid and will continue to pay U.S. federal, state and local income tax on their taxable income, and their after-tax net income is available for distribution to us but is not required to be distributed by such domestic TRSs to us. We believe that the aggregate value of the stock and securities of our TRSs has been and we anticipate that the aggregate value will continue to be less than 25% (20% for taxable years beginning after December 31, 2017) of the value of our total assets (including our TRS stock and securities). Furthermore, we have monitored and will continue to monitor the value of our respective investments in our TRSs for the purpose of ensuring compliance with TRS ownership limitations. In addition, we have scrutinized and will continue to scrutinize all of our transactions with TRSs to ensure that they are entered into on arm’s length terms to avoid incurring the 100% excise tax described above. There can be no assurance, however, that we will be able to comply with the TRS limitation discussed above or to avoid application of the 100% excise tax discussed above.

Complying with REIT requirements may limit our ability to hedge effectively and may cause us to incur tax liabilities.

The REIT provisions of the Code limit our ability to hedge our liabilities. Generally, income from a hedging transaction we enter into to manage risk of interest rate fluctuations with respect to borrowings, including gain from the disposition of such hedging transactions, to the extent the hedging transactions hedge indebtedness incurred, or to be incurred, by us to acquire or carry real estate assets does not constitute “gross income” for purposes of the 75% or 95% gross income tests, provided we properly identify the hedge pursuant to the applicable sections of the Code and Treasury regulations. To the extent that we enter into other types of hedging transactions, the income from those transactions is likely to be treated as non-qualifying income for purposes of both gross income tests. As a result of these rules, we may need to limit our use of advantageous hedging techniques or implement those hedges through a taxable REIT subsidiary. This could increase the cost of our hedging activities because our taxable REIT subsidiary would be subject to tax on income or gains resulting from hedges entered into by it or expose us to greater risks associated with changes in interest rates than we would otherwise want to bear. In addition, losses in our taxable REIT subsidiary will generally not provide any tax benefit, except for being carried forward for use against future taxable income in our taxable REIT subsidiary.

There is a risk of changes in the tax law applicable to REITs.

The IRS, the United States Treasury Department and Congress frequently review U.S. federal income tax legislation. We cannot predict whether, when or to what extent new federal tax laws, regulations, interpretations or rulings will be adopted. Any legislative action may prospectively or retroactively modify our tax treatment and, therefore, may adversely affect taxation of us and/or our shareholders.

Item 1B.    Unresolved Staff Comments.

None.

17

Item 2.    Properties.

General.    At December 31, 2015, we had real estate investments totaling approximately $3.9 billion in 65 properties (127 buildings) that were leased to approximately 1,000 tenants. At December 31, 2015, we owned the following real estate (dollars in thousands):

Property	State	Number of Buildings	Undepreciated Carrying Value(1)		Depreciated Carrying Value(1)		Annualized Rental Revenue(2)
785 Schilinger Road South	AL	1	$	11,269	$	9,279	$	987
Parkshore Plaza	CA	4	49,179		44,093		2,975
Leased Land/Vineyards	CA	7	31,968		29,106		2,922
Sky Park Centre	CA	2	9,786		6,478		1,392
9110 East Nichols Avenue	CO	1	20,326		13,888		2,548
1225 Seventeenth Street	CO	1	149,759		128,164		21,475
5073, 5075, & 5085 S. Syracuse Street	CO	1	63,610		55,267		7,164
1601 Dry Creek Drive	CO	1	33,646		24,481		8,214
97 Newberry Road	CT	1	15,350		12,485		1,817
33 Stiles Lane	CT	1	9,793		7,632		623
1250 H Street, NW	DC	1	70,698		44,668		6,597
Georgetown-Green and Harris Buildings	DC	2	60,023		54,323		6,325
802 Delaware Avenue	DE	1	43,467		20,376		4,127
6600 North Military Trail	FL	3	145,813		129,589		16,573
Executive Park	GA	9	44,224		29,365		4,990
633 Ahua Street	HI	1	16,401		12,636		1,831
625 Crane Street	IL	1	1,611		1,524		444
1200 Lakeside Drive	IL	1	61,572		48,971		3,130
600 West Chicago Avenue	IL	2	362,681		327,002		40,301
8750 Bryn Mawr Avenue	IL	2	91,594		79,889		15,610
101-115 W. Washington Street	IN	1	91,170		67,194		12,364
111 Monument Circle	IN	2	176,311		163,196		22,802
109 Brookline Avenue	MA	1	46,249		27,531		10,911
Cabot Business Park Land	MA	—	1,033		1,033		—
111 Market Place	MD	1	77,125		52,372		12,098
25 S. Charles Street	MD	1	38,504		26,025		7,254
820 W. Diamond	MD	1	33,682		22,195		2,839
Danac Stiles Business Park	MD	3	65,564		46,580		6,934
East Eisenhower Parkway	MI	2	55,261		48,425		10,174
2250 Pilot Knob Road	MN	1	6,530		3,887		833
411 Farwell Avenue	MN	1	16,357		12,831		1,906
6200 Glenn Carlson Drive	MN	1	15,753		13,597		2,189
4700 Belleview Avenue	MO	1	7,157		6,128		1,204
111 River Street (3)	NJ	1	136,070		114,440		23,197
North Point Office Complex	OH	2	124,584		102,221		15,805
Raintree Industrial Park	OH	12	12,311		11,453		2,176
401 Vine Street	PA	1	7,117		5,987		549
Cherrington Corporate Center	PA	7	74,174		52,694		7,637
1500 Market Street	PA	1	290,399		211,848		35,706
1525 Locust Street	PA	1	11,210		7,088		2,342
1600 Market Street	PA	1	133,667		78,133		18,232
1735 Market Street	PA	1	299,635		178,397		31,188
Foster Plaza	PA	8	75,725		55,954		12,262

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Property	State	Number of Buildings	Undepreciated Carrying Value(1)		Depreciated Carrying Value(1)		Annualized Rental Revenue(2)
128 Crews Drive	SC	1	3,747		3,258		636
111 Southchase Boulevard	SC	1	6,164		4,633		838
1043 Global Avenue	SC	1	16,875		13,338		1,484
633 Frazier Drive	TN	1	18,980		16,269		2,081
1601 Rio Grande Street	TX	1	8,396		5,290		1,511
206 East 9th Street	TX	1	48,599		44,897		6,074
4515 Seton Center Parkway	TX	1	23,107		13,997		2,933
4516 Seton Center Parkway	TX	1	23,301		13,620		2,902
7800 Shoal Creek Boulevard	TX	4	21,252		13,580		3,235
812 San Antonio Street	TX	1	8,826		5,711		1,627
8701 N Mopac	TX	1	18,419		11,668		1,782
Bridgepoint Parkway	TX	5	88,427		50,868		10,879
Lakewood on the Park	TX	2	37,111		22,557		4,216
Research Park	TX	4	90,635		61,071		11,484
9840 Gateway Boulevard North	TX	1	11,432		9,436		1,128
3003 South Expressway 281	TX	1	17,004		13,811		1,922
3330 N Washington Boulevard	VA	1	8,823		5,519		273
333 108th Avenue NE	WA	1	152,557		130,497		18,479
600 108th Avenue NE	WA	1	48,051		36,147		5,914
1331 North Center Parkway	WA	1	9,187		7,681		944
100 East Wisconsin Avenue	WI	1	82,996		71,563		10,911
111 East Kilbourn Avenue	WI	1	55,105		44,577		8,169
Total Properties		127	$	3,887,352	$	2,988,413	$	490,069

(1) Excludes purchase price allocations for acquired real estate leases.

(2) Annualized rental revenue is annualized contractual rents from our tenants pursuant to leases which have commenced as of December 31, 2015, plus estimated recurring expense reimbursements; includes triple net lease rents and excludes lease value amortization, straight line rent adjustments, free rent periods and parking revenue.

(3) Property is subject to a ground lease.

At December 31, 2015, five properties (8 buildings) were encumbered by mortgage notes payable totaling $249.7 million (including net premiums and discounts).

Item 3. Legal Proceedings.

We are or may be a party to various legal proceedings that arise in the ordinary course of business. We are not currently involved in any litigation nor, to our knowledge, is any litigation threatened against us where the outcome would, in our judgment based on information currently available to us, have a material adverse effect on our consolidated financial position or consolidated results of operations.

Item 4.    Mine Safety Disclosures.

Not applicable.

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PART II

Item 5.    Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Our common shares are traded on the NYSE (symbol: EQC). The following table sets forth for the periods indicated the high and low sale prices for our common shares, as reported by the NYSE:

	High		Low
2015
First Quarter	$	27.24	$	24.97
Second Quarter	27.64		24.91
Third Quarter	27.70		25.17
Fourth Quarter	29.75		26.34
2014
First Quarter	$	28.10	$	22.06
Second Quarter	28.28		24.81
Third Quarter	27.95		25.11
Fourth Quarter	27.12		23.56

As of February 8, 2016, there were 1,460 shareholders of record of our common shares. However, because many of our common shares are held by brokers and other institutions on behalf of shareholders, we believe that there are considerably more beneficial holders of our common shares than record holders.

Distributions

Under our governing documents and Maryland law, distributions to our shareholders are to be authorized and declared by our Board of Trustees.

The following table sets forth the cash distributions per share we paid to our common shareholders for the periods indicated:

	Cash Distributions Per Common Share
	2015		2014
First Quarter	$	—	$	0.25
Second Quarter	—		—
Third Quarter	—		—
Fourth Quarter	—		—
Total	$	—	$	0.25

As a result of the taxable losses recognized on property sales in 2015 and the net operating loss carryforward from 2014, a distribution to common shareholders was not required for 2015. The timing and amount of future distributions is determined at the discretion of our Board of Trustees and will depend upon various factors that our Board of Trustees deems relevant, including, but not limited to, our results of operations, our financial condition, debt and equity capital available to us, our expectations of our future capital requirements and operating performance, including our FFO, our Normalized FFO, and our cash available for distribution, restrictive covenants in our financial or other contractual arrangements (including those in our revolving credit facility and term loan agreements and senior notes indenture), tax law requirements to qualify for taxation as and remain a REIT, restrictions under Maryland law and our expected needs and availability of cash to pay our obligations and fund acquisitions. Therefore, there can be no assurance that we will pay distributions in the future.

Issuer Repurchases; Unregistered Sales of Securities

We did not repurchase any of our common shares in the fourth quarter of 2015.

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Performance Graph

Notwithstanding anything to the contrary set forth in any of our filings under the Securities Act or the Exchange Act that might incorporate SEC filings, in whole or in part, the following performance graph will not be incorporated by reference into any such filings.

The following graph compares the cumulative total shareholder return of our common shares for the period from December 31, 2010 to December 31, 2015, to the NAREIT All REITs, Standard & Poor’s 500 Index, or the S&P 500, and to the NAREIT Equity Office Index over the same period. The graph assumes an investment of $100.00 in our common shares and each index and the reinvestment of all distributions. The shareholder return shown on the graph below is not indicative of future performance.

	Period Ending
Index	12/31/2010		12/31/2011		12/31/2012		12/31/2013		12/31/2014		12/31/2015
Equity Commonwealth	$	100.00	$	70.97	$	74.47	$	114.92	$	127.96	$	138.23
NAREIT All REITs	$	100.00	$	107.28	$	128.89	$	133.02	$	169.14	$	173.01
S&P 500	$	100.00	$	102.11	$	118.45	$	156.82	$	178.28	$	180.75
NAREIT Equity Office Index	$	100.00	$	99.24	$	113.29	$	119.60	$	150.52	$	150.96

Source: SNL Financial LC

Item 6.    Selected Financial Data.

The following table sets forth selected financial data for the periods and dates indicated. This data should be read in conjunction with, and is qualified in its entirety by reference to, "Management's Discussion and Analysis of Financial Condition and Results of Operations" in Part II, Item 7 and the consolidated financial statements and accompanying notes included in "Exhibits and Financial Statement Schedules" in Part IV, Item 15 of this Annual Report on Form 10-K. Reclassifications have been made to

21

the prior years' financial statements to conform to the current year's presentation. Amounts are in thousands, except per share data.

	Year Ended December 31,
Operating Data	2015			2014			2013			2012			2011
Total revenues	$	714,891		$	861,857		$	953,029		$	961,087		$	819,450
Expenses:
Operating expenses	324,948			387,982			410,045			397,673			340,101
Depreciation and amortization	194,001			227,532			234,402			230,284			191,830
General and administrative	57,457			113,155			80,504			49,312			41,402
Loss on asset impairment	17,162			185,067			124,253			—			3,036
Acquisition related costs	—			5			318			5,648			9,731
Total expenses	593,568			913,741			849,522			682,917			586,100
Operating income (loss)	121,323			(51,884		)	103,507			278,170			233,350
Interest and other income	5,989			1,561			1,229			1,410			1,663
Interest expense	(107,316		)	(143,230		)	(173,011		)	(202,055		)	(192,163		)
Gain (loss) on early extinguishment of debt	6,661			4,909			(60,052		)	(287		)	(35		)
Gain on sale of equity investment	—			171,561			66,293			—			—
Gain on issuance of shares by an equity investee	—			17,020			—			7,246			11,177
Foreign currency exchange loss	(8,857		)	—			—			—			—
Gain on sale of properties	84,421			—			1,596			—			—
Income (loss) from continuing operations before income tax expense and equity in earnings of investees	102,221			(63		)	(60,438		)	84,484			53,992
Income tax expense	(2,364		)	(3,191		)	(2,634		)	(3,207		)	(1,347		)
Equity in earnings of investees	—			24,460			25,754			11,420			11,377
Income (loss) from continuing operations	99,857			21,206			(37,318		)	92,697			64,022
Discontinued operations	—			2,806			(119,649		)	(172,542		)	45,962
Net income (loss)	99,857			24,012			(156,967		)	(79,845		)	109,984
Net income attributable to noncontrolling interest in consolidated subsidiary	—			—			(20,093		)	(15,576		)	—
Net income (loss) attributable to Equity Commonwealth	99,857			24,012			(177,060		)	(95,421		)	109,984
Preferred distributions	(27,924		)	(32,095		)	(44,604		)	(51,552		)	(46,985		)
Excess fair value of consideration over carrying value of preferred shares	—			(16,205		)	—			(4,985		)	—
Net income (loss) attributable to common shareholders	71,933			(24,288		)	(221,664		)	(151,958		)	62,999
Common distributions declared	—			29,597			109,702			146,539			150,074
Weighted average common shares outstanding—basic	128,621			125,163			112,378			83,750			77,428
Weighted average common shares outstanding—diluted	129,437			125,163			112,378			83,750			77,428
Basic earnings per common share attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations	$	0.56		$	(0.21	)	$	(0.91	)	$	0.25		$	0.22
Net income (loss)	$	0.56		$	(0.19	)	$	(1.97	)	$	(1.81	)	$	0.81
Diluted earnings per common share attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations	$	0.56		$	(0.21	)	$	(0.91	)	$	0.25		$	0.22
Net income (loss)	$	0.56		$	(0.19	)	$	(1.97	)	$	(1.81	)	$	0.81
Common distributions declared	$	—		$	0.25		$	1.00		$	1.75		$	2.00

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	December 31,
Balance Sheet Data	2015		2014		2013		2012		2011
Real estate properties(1)	$	3,887,352	$	5,728,443	$	5,537,165	$	7,829,409	$	7,244,232
Equity investments	—		—		517,991		184,711		177,477
Total assets	5,244,372		5,761,639		6,646,434		8,189,634		7,447,026
Total indebtedness, net	1,710,324		2,207,665		3,005,410		4,349,821		3,577,331
Total shareholders' equity attributable to Equity Commonwealth	3,368,487		3,319,583		3,363,586		3,105,428		3,568,517
Noncontrolling interest in consolidated subsidiary	—		—		—		396,040		—
Total shareholders' equity	3,368,487		3,319,583		3,363,586		3,501,468		3,568,517

(1) Excludes value of acquired real estate leases.

Item 7.  Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion should be read in conjunction with our consolidated financial statements and accompanying notes included elsewhere in this Annual Report on Form 10-K.

OVERVIEW

We are an internally managed and self-advised REIT engaged in the ownership and operation primarily of office buildings throughout the United States. We were formed in 1986 under Maryland law.

At December 31, 2015, our portfolio included 65 properties (127 buildings) with a combined 24.0 million square feet for a total investment of $3.9 billion at cost and a depreciated book value of $3.0 billion.

As of December 31, 2015, our overall portfolio was 91.4% leased. During the year ended December 31, 2015, we entered into leases for 4.9 million square feet, including lease renewals for 2.8 million square feet and new leases for 2.1 million square feet.  Leases entered into during the year ended December 31, 2015, including both lease renewals and new leases, had weighted average cash rental rates that were approximately 1.5% higher than prior rental rates for the same space and weighted average GAAP rental rates that were approximately 8.4% higher than prior rental rates for the same space.  The change in GAAP rents is different than the change in cash rents due to differences in the amount of rent abatements, the magnitude and timing of contractual rent increases over the lease term, and the years of term for the newly executed leases compared to the prior leases.

Following our transition from external management to internal management in 2014, our new management team has focused on developing a plan to reshape our portfolio in order to create long-term value for shareholders. We undertook a comprehensive review of our portfolio and our operations and have developed a strategy that focuses on reshaping our portfolio over time. We anticipate that as part of this plan, we will dispose properties that do not meet our long-term goals. Specifically, our Board of Trustees adopted a strategy to consider disposing of assets that have one or more of the following attributes:

• assets that do not offer an opportunity to create a competitive advantage;

• assets that are less than 150,000 square feet;

• assets that are not office buildings;

• assets that are not located in the U.S.; or

• assets that produce a low cash yield or require significant capital expenditures.

We are in the process of executing this strategy and may sell approximately $3.0 billion of assets, depending on market conditions.

During the year ended December 31, 2015, we disposed of 91 properties (135 buildings) and one land parcel with a combined 18.9 million square feet for an aggregate gross sales price of $2.0 billion, excluding closing costs. As a result of these dispositions, we exited 68 cities, seven states and one country. For more information regarding the 2015 dispositions, see Note 4 to the notes to our consolidated financial statements included in Part II, Item 8 of this Annual Report on Form 10-K.

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We have generated significant proceeds from the dispositions and have a cash balance of $1.8 billion as of December 31, 2015. We expect to reinvest the capital received from dispositions to purchase new properties, repay debt, redeem preferred shares, buy back common shares or make other investments or distributions that further our long-term strategic goals. However, we may not be able to make acquisitions or other investments with the proceeds from the dispositions. If our real estate investments decrease significantly, income from operations may also decline.

As part of the disposition plan noted above, and pursuant to our accounting policy, we evaluated the recoverability of the carrying values of each of the real estate assets that comprised our portfolio and determined that due to the shortening of the expected periods of ownership as a result of the disposition plan, it was necessary to reduce the net book value of a portion of the real estate assets in our portfolio to reduce the assets to their estimated fair values.  During the year ended December 31, 2015, we recorded an impairment charge of $17.2 million in accordance with our impairment analysis procedures.

As a result of the taxable losses recognized on property sales in 2015 and the net operating loss carryforward from 2014, a distribution to common shareholders will not be required for 2015. The Board of Trustees has regularly reviewed our dividend policy and will continue to do so, at least annually.

Effective September 30, 2014, we terminated our business and property management relationships with RMR for our U.S. properties pursuant to a termination and cooperation agreement, which we refer to as the Cooperation Agreement. Pursuant to the Cooperation Agreement, through February 28, 2015, RMR and RMR Australia, which we refer to together as Manager, agreed to use best efforts to assist us in the transition of our management and operations. We paid Manager $1.2 million per month for transition services from October 1, 2014 to February 28, 2015, which included continued management and other services for the Australian assets pursuant to an existing management agreement, or the Australia Management Agreement. Beginning March 1, 2015, we agreed to pay Manager $0.1 million per month until we no longer required such services or until the Australia Management Agreement was terminated, which was terminated in the third quarter of 2015, effective October 31, 2015. The $2.7 million incurred pursuant to the Cooperation Agreement for the year ended December 31, 2015, is included in general and administrative expenses in our consolidated financial statements. There is no future obligation to pay any fees to Manager.

Effective October 1, 2014, we engaged CBRE to provide property management services for our U.S. properties. We pay CBRE a property-by-property management fee and may engage CBRE from time-to-time to perform project management services, such as coordinating and overseeing the completion of tenant improvements and other capital projects at the properties. We reimburse CBRE for certain expenses incurred in the performance of its duties, including certain personnel and equipment costs.

For the years ended December 31, 2015 and 2014, we incurred expenses of $42.7 million and $8.8 million, respectively, related to our property management agreement with CBRE, for property management fees, typically calculated as a portion of the properties revenues, and salary and benefits reimbursements for property personnel, such as property managers, engineers and maintenance staff.  As of December 31, 2015 and December 31, 2014, we had amounts payable pursuant to these services of $3.5 million and $6.7 million, respectively.

Property Operations

Occupancy data for 2015 and 2014 are as follows (square feet in thousands):

	All Properties				Comparable Properties(1)
	As of December 31,				As of December 31,
	2015		2014		2015		2014
Total properties	65		156		65		65
Total square feet	23,952		42,891		23,952		23,952
Percent leased(2)	91.4	%	85.8	%	91.4	%	90.0	%

(1) Based on properties owned continuously from January 1, 2014 through December 31, 2015, and excludes properties sold during the period ended December 31, 2015 and properties classified as discontinued operations for the period ended December 31, 2014.

(2) Percent leased includes (i) space being fitted out for occupancy pursuant to existing leases and (ii) space which is leased but is not occupied or is being offered for sublease by tenants.

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The weighted average lease term based on square feet for leases entered into during the year ended December 31, 2015 was 6.3 years.  Commitments made for leasing expenditures and concessions, such as tenant improvements and leasing commissions, for leases entered into during the year ended December 31, 2015 totaled $156.4 million, or $32.08 per square foot on average (approximately $5.06 per square foot per year of the lease term).

As of December 31, 2015, approximately 9.9% of our leased square feet and 10.0% of our annualized rental revenue, determined as set forth below, are included in leases scheduled to expire through December 31, 2016.  Renewed and new leases and rental rates at which available space may be relet in the future will depend on prevailing market conditions at the times these leases are negotiated.  We believe that the in-place cash rents for leases expiring in 2016 are slightly below market. Lease expirations by year, as of December 31, 2015, are as follows (square feet and dollars in thousands):

Year	Number of Tenants Expiring	Leased Square  Feet Expiring(1)	% of Leased Square Feet Expiring(1)		Cumulative % of Leased Square Feet Expiring(1)		Annualized Rental Revenue Expiring(2)		% of Annualized Rental Revenue Expiring		Cumulative % of Annualized Rental Revenue Expiring
2016(3)	174	2,173	9.9	%	9.9	%	$	49,142	10.0	%	10.0	%
2017	147	2,065	9.4	%	19.3	%	50,088		10.2	%	20.2	%
2018	152	2,515	11.5	%	30.8	%	64,614		13.2	%	33.4	%
2019	114	1,650	7.4	%	38.2	%	42,828		8.7	%	42.1	%
2020	127	3,846	17.6	%	55.8	%	56,072		11.5	%	53.6	%
2021	83	1,879	8.6	%	64.4	%	42,209		8.6	%	62.2	%
2022	43	854	3.9	%	68.3	%	23,199		4.7	%	66.9	%
2023	54	1,741	8.0	%	76.3	%	44,068		9.0	%	75.9	%
2024	19	607	2.8	%	79.1	%	14,134		2.9	%	78.8	%
2025	25	1,113	5.1	%	84.2	%	27,006		5.5	%	84.3	%
Thereafter	47	3,454	15.8	%	100.0	%	76,709		15.7	%	100.0	%
	985	21,897	100.0	%			$	490,069	100.0	%
Weighted average remaining lease term (in years):		5.6					5.7

(1) Square feet is pursuant to existing leases as of December 31, 2015, and includes (i) space being fitted out for occupancy and (ii) space which is leased but is not occupied or is being offered for sublease by tenants. 

(2) Annualized rental revenue is annualized contractual rents from our tenants pursuant to leases which have commenced as of December 31, 2015, plus estimated recurring expense reimbursements; includes triple net lease rents and excludes lease value amortization, straight line rent adjustments, free rent periods, and parking revenue. 

(3) Square footage expiring in 2016 includes 0.1 million square feet related to month-to-month and self storage tenants. Annualized rental revenue expiring in 2016 includes $3.3 million of month-to-month and self storage rent.

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A principal source of funds for our operations is rents from tenants at our properties.  Rents are generally received from our tenants monthly in advance, except from our government tenants, who usually pay rents monthly in arrears.  As of December 31, 2015, tenants representing 1% or more of our total annualized rental revenue were as follows (square feet in thousands):

Tenant		Square Feet(1)	% of Total Square Feet(1)		% of Annualized Rental Revenue(2)		Weighted Average Remaining Lease Term
1.	Expedia, Inc.	398	1.8	%	3.6	%	2.8
2.	Office Depot, Inc.	640	2.9	%	3.3	%	7.8
3.	John Wiley & Sons, Inc.	414	1.9	%	3.2	%	16.2
4.	PNC Financial Services Group	587	2.7	%	3.0	%	5.1
5.	Flextronics International Ltd.	1,051	4.8	%	2.2	%	4.0
6.	J.P. Morgan Chase & Co.	356	1.6	%	2.1	%	9.0
7.	Groupon, Inc.(3)	378	1.7	%	1.9	%	10.0
8.	Jones Day	343	1.6	%	1.8	%	10.5
9.	Towers Watson & Co	369	1.7	%	1.7	%	3.9
10.	Ballard Spahr LLP	217	1.0	%	1.6	%	14.1
11.	Carmike Cinemas, Inc.(4)	552	2.5	%	1.5	%	0.7
12.	RE/MAX Holdings, Inc.	248	1.1	%	1.4	%	12.3
13.	Exelon Corporation	279	1.3	%	1.3	%	2.4
14.	FMC Corporation	207	0.9	%	1.3	%	0.4
15.	Georgetown University	240	1.1	%	1.3	%	3.7
16.	University of Pennsylvania Health System	267	1.2	%	1.2	%	9.8
17.	Wm. Wrigley Jr. Company	150	0.7	%	1.1	%	6.1
18.	West Corporation	336	1.5	%	1.1	%	13.2
19.	The United States Government	162	0.7	%	1.0	%	2.6
20.	M&T Bank	218	1.0	%	1.0	%	2.7
	Total	7,412	33.7	%	36.6	%	6.6

(1) Square footage is pursuant to existing leases as of December 31, 2015, and includes (i) space being fitted out for occupancy and (ii) space which is leased but is not occupied or is being offered for sublease by tenants. 

(2) Annualized rental revenue is annualized contractual rents from our tenants pursuant to leases which have commenced as of December 31, 2015, plus estimated recurring expense reimbursements; includes triple net lease rents and excludes lease value amortization, straight line rent adjustments, free rent periods, and parking revenue. 

(3) Groupon, Inc. statistics include 207,536 square feet that are sublet from Bankers Life and Casualty Company.

(4) Subsequent to December 31, 2015, Carmike Cinemas' lease was extended. The weighted average remaining lease term is 14.7 years.

Financing Activities

On December 1, 2015, we repaid at par the $116.0 million of 5.24% mortgage debt at 111 Monument Circle and recognized a gain on early extinguishment of debt of $0.6 million for the year ended December 31, 2015 from the write-off of an unamortized premium, net of the write-off of unamortized deferred financing fees.

On August 3, 2015, we defeased the $141.4 million outstanding balance of the mortgage loan secured by 111 East Wacker Drive, one of the buildings included in Illinois Center. The defeasance costs and write off of the unamortized deferred financing costs, net of the write off of the unamortized premium, resulted in a net loss on early extinguishment of debt of $3.9 million for the year ended December 31, 2015.

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On June 5, 2015, we prepaid $10.0 million of 7.36% mortgage debt at 2501 20th Place South and recognized a loss on early extinguishment of debt of $0.6 million for the year ended December 31, 2015, which consisted of a prepayment premium and the write off of unamortized deferred financing fees, net of the write off of an unamortized premium.

On June 3, 2015, we defeased the $38.7 million outstanding balance of the mortgage loan secured by 1320 Main Street. The defeasance costs and write off of the unamortized deferred financing costs, net of the write off of the unamortized premium, resulted in a net loss on early extinguishment of debt of $6.2 million for the year ended December 31, 2015.

On May 22, 2015, title to 225 Water Street was transferred to the lender pursuant to the consensual foreclosure in full satisfaction of the mortgage debt, with a principal balance of $40.1 million. The transaction resulted in a gain on early extinguishment of debt of $17.3 million for the year ended December 31, 2015.

On May 1, 2015, we redeemed at par $138.8 million of our 5.75% senior unsecured notes due 2015 and recognized a loss on early extinguishment of debt of $0.1 million for the year ended December 31, 2015.

On January 29, 2015, we entered into a new credit agreement, pursuant to which the lenders agreed to provide (i) a $750.0 million unsecured revolving credit facility, (ii) a $200.0 million 5-year term loan facility and (iii) a $200.0 million 7-year term loan facility. The new credit agreement, which replaced our prior credit agreement and our prior term loan agreement, reduces the interest rate and extends the term of our revolving credit facility and term loan borrowings.  The revolving credit facility has a scheduled maturity date of January 28, 2019, with two six-month extension options subject to certain conditions and the payment of an extension fee. The 5-year term loan and the 7-year term loan have scheduled maturity dates of January 28, 2020 and January 28, 2022, respectively, and have been fully funded. We used the proceeds from the new term loans to repay all amounts outstanding and due under the previous term loan agreement. We do not currently have any amounts outstanding under the revolving credit facility.

For more information regarding our financing sources and activities, please see the section captioned “Liquidity and Capital Resources—Our Investment and Financing Liquidity and Resources” below.

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RESULTS OF OPERATIONS

Year Ended December 31, 2015 Compared to Year Ended December 31, 2014

	Comparable Properties Results(1)											Other Properties Results(2)						Consolidated Results
	Year Ended December 31,
	2015			2014			$ Change			% Change		2015			2014			2015			2014			$ Change			% Change
	(in thousands)
Rental income(3)	$	432,921		$	431,677		1,244			0.3	%	$	137,461		$	260,022		$	570,382		$	691,699		$	(121,317	)	(17.5	)%
Tenant reimbursements and other income	108,253			109,589			(1,336		)	(1.2	)%	36,256			60,569			144,509			170,158			(25,649		)	(15.1	)%
Operating expenses	(230,534		)	(229,777		)	(757		)	0.3	%	(94,414		)	(158,205		)	(324,948		)	(387,982		)	63,034			(16.2	)%
Net operating income(4)	$	310,640		$	311,489		$	(849	)	(0.3	)%	$	79,303		$	162,386		389,943			473,875			(83,932		)	(17.7	)%
Other expenses:
Depreciation and amortization																		194,001			227,532			(33,531		)	(14.7	)%
General and administrative																		57,457			113,155			(55,698		)	(49.2	)%
Loss on asset impairment																		17,162			185,067			(167,905		)	(90.7	)%
Acquisition related costs																		—			5			(5		)	(100.0	)%
Total other expenses																		268,620			525,759			(257,139		)	(48.9	)%
Operating income (loss)																		121,323			(51,884		)	173,207			(333.8	)%
Interest and other income																		5,989			1,561			4,428			283.7	%
Interest expense																		(107,316		)	(143,230		)	35,914			(25.1	)%
Gain on early extinguishment of debt																		6,661			4,909			1,752			35.7	%
Gain on sale of equity investments																		—			171,561			(171,561		)	(100.0	)%
Gain on issuance of shares by an equity investee																		—			17,020			(17,020		)	(100.0	)%
Foreign currency exchange loss																		(8,857		)	—			(8,857		)	(100.0	)%
Gain on sale of properties																		84,421			—			84,421			100.0	%
Income (loss) from continuing operations before income taxes and equity in earnings of investees																		102,221			(63		)	102,284			(162,355.6	)%
Income tax expense																		(2,364		)	(3,191		)	827			(25.9	)%
Equity in earnings of investees																		—			24,460			(24,460		)	(100.0	)%
Income from continuing operations																		99,857			21,206			78,651			370.9	%
Discontinued operations:
Income from discontinued operations																		—			8,389			(8,389		)	(100.0	)%
Loss on asset impairment from discontinued operations																		—			(2,238		)	2,238			(100.0	)%
Loss on early extinguishment of debt from discontinued operations																		—			(3,345		)	3,345			(100.0	)%
Net income																		99,857			24,012			75,845			315.9	%
Preferred distributions																		(27,924		)	(32,095		)	4,171			(13.0	)%
Excess fair value of consideration over carrying value of preferred shares																		—			(16,205		)	16,205			(100.0	)%
Net income (loss) available for Equity Commonwealth common shareholders																		$	71,933		$	(24,288	)	$	96,221		(396.2	)%

(1) Comparable properties consist of 65 properties (127 buildings) owned continuously from January 1, 2014 to December 31, 2015.

(2) Other properties consist of properties sold.

(3) During the year ended December 31, 2015, we recognized non-recurring charges against revenues of $2.7 million related to a parking tax matter and a tenant lease termination at 600 West Chicago Avenue.

(4) We calculate net operating income, or NOI, as shown above.  We define NOI as income from our real estate including lease termination fees received from tenants less our property operating expenses.  NOI excludes amortization of capitalized tenant improvement costs and leasing commissions.  We consider NOI to be an appropriate supplemental measure to net income because it may help both investors and management to understand the operations of our properties.  We use NOI internally to evaluate property level performance, and we believe that NOI provides useful information to investors regarding our results of operations because it reflects only those income and expense items that are incurred at the property level and may facilitate comparisons of our operating performance between periods and with other REITs.  NOI does not represent cash generated by operating activities in accordance with GAAP and should not be considered as an alternative to net income, net income attributable to Equity Commonwealth common shareholders, operating income or cash flow from operating activities, determined in accordance with GAAP, or as an indicator of our financial performance or liquidity, nor is this measure necessarily indicative of sufficient cash flow to fund all of our needs.  This measure should be considered in conjunction with net income, net income attributable to Equity Commonwealth common shareholders, operating income and cash flow from operating activities as presented in our consolidated statements of operations, consolidated statements of comprehensive income and consolidated statements of cash flows.  Other REITs and real estate companies may calculate NOI differently than we do.

We refer to the 65 properties (127 buildings) we owned continuously from January 1, 2014 to December 31, 2015, as comparable properties.  We refer to the sold properties as other properties.  Our consolidated statements of operations for the

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years ended December 31, 2015 and 2014 include the operating results of 65 properties for the entire periods, as we owned these properties as of January 1, 2014. 

Rental income. Rental income decreased $121.3 million in the 2015 period, compared to the 2014 period, primarily due to the properties sold during the year ended December 31, 2015. Our comparable properties increased $1.2 million primarily due to an increase in the recognition of lease termination fees and increases due to the write offs in 2014 of an acquired real estate lease after a tenant vacated its space prior to the lease expiration and of a deferred rent receivable after a tenant contracted its lease space. These increases were partially offset by a decrease in rental income due to leasing activity in 2015 at a particular building where one tenant vacated its space and two tenants shortened their remaining lease terms. In connection with these leasing transactions, the corresponding deferred rent receivable balances were written off or amortized over the shorter term. The increase in rental income was also partially offset by non-recurring charges against revenues of $2.7 million related to a parking tax matter and a tenant lease termination at 600 West Chicago Avenue recognized during the year ended December 31, 2015.

Rental income includes increases for non-cash straight line rent adjustments totaling $5.3 million in the 2015 period and $12.5 million in the 2014 period, and net reductions for amortization of acquired real estate leases and assumed real estate lease obligations totaling $7.5 million in the 2015 period and $10.6 million in the 2014 period. Rental income also includes the recognition of lease termination fees totaling $8.2 million in the 2015 period and $4.7 million in the 2014 period.

Tenant reimbursements and other income. Tenant reimbursements and other income decreased $25.6 million in the 2015 period, compared to the 2014 period primarily due to the properties sold in 2015 and a $1.3 million decrease at our comparable properties primarily resulting from non-recurring prior year utility expense reimbursement.

Operating expenses. The $63.0 million decrease in operating expenses during the 2015 period as compared to the 2014 period is primarily due to the properties sold during the year ended December 31, 2015, partially offset by a $0.8 million increase at our comparable properties. The increase in operating expenses at the comparable properties primarily reflects increases in real estate tax expense related to increases in assessed values, bad debt expense primarily due to an evicted tenant, property related legal fees, maintenance and repairs, HVAC expenses and cleaning expenses, partially offset by decreases in management fees and increases in real estate tax refunds in 2015 related to prior year real estate taxes.

Depreciation and amortization. The decrease in depreciation and amortization expense in the 2015 period when compared to the 2014 period primarily relates to properties sold in 2015. This decrease was partially offset by an increase in depreciation and amortization expense resulting from the leasing transactions discussed above, where due to one tenant vacating its space and two other tenants shortening their remaining lease term, the corresponding tenant improvements were written off or depreciation was accelerated.

General and administrative. The decrease in general and administrative expenses primarily relates to $43.9 million of business management and incentive fees paid to our prior external manager in 2014, a $14.5 million decrease related to the shareholder approved reimbursement of expenses incurred by Related/Corvex in connection with their consent solicitation to remove our former Trustees, and a $9.4 million decrease in legal and litigation costs, partially offset by the internalization of our management, which includes a $9.5 million increase in share-based compensation expense.

Loss on asset impairment. During the year ended December 31, 2015, we recorded an impairment charge of $17.2 million related to 12655 Olive Boulevard, 1285 Fern Ridge Parkway and portfolios of properties located in Georgia and New York, based upon updated market information in accordance with our impairment analysis procedures. The impairment charge in 2014 includes $22.7 million related to 225 Water Street where we made the decision to cease making loan servicing payments and impairment losses recorded in the fourth quarter of 2014 as a result of the change in the anticipated holding period for certain properties.

Interest and other income. The increase in interest and other income primarily relates to a $3.1 million gain on the sale of securities in the first quarter of 2015 and an increase in bank interest income due to a higher average cash balance during the 2015 period as compared to the 2014 period.

Interest expense. The decrease in interest expense in the 2015 period primarily reflects the payment of the $235.0 million balance on our revolving credit facility in July 2014, the prepayment of $265.0 million of 5.68% mortgage debt in August 2014, the prepayment of $33.4 million of our 6.40% unsecured notes in September 2014, the prepayment of $125.0 million of our 7.50% unsecured notes in November 2014 the payment of $100.0 million of our term loan in December 2014, the prepayment of $138.8 million of our 5.75% senior unsecured notes due 2015 in May 2015, the foreclosure of 225 Water Street in May 2015 and the defeasance of the outstanding balance of the mortgage debt secured by 111 East Wacker Drive, one of the buildings included in Illinois Center, in August 2015.

Gain on early extinguishment of debt. The gain on early extinguishment of debt in the 2015 period reflects a $17.3 million gain related to the 225 Water Street foreclosure and a $0.6 million gain related to the repayment of mortgage debt at 111 Monument

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Circle, partially offset by a $6.2 million loss related to the defeasance of the mortgage loan secured by 1320 Main Street, a $3.9 million loss related to the defeasance of the mortgage loan secured by 111 East Wacker Drive, a $0.6 million loss related to the prepayment of mortgage debt at 2501 20th Place South, a $0.1 million loss related to the redemption of $138.8 million of our 5.75% senior notes and a $0.4 million loss related to the new credit agreement entered into in January 2015, which resulted in the termination of our prior credit agreement. The gain on early extinguishment of debt in the 2014 period primarily reflects the write-off of unamortized premiums and deferred financing fees related to the prepayment of $265.0 million of 5.68% mortgage debt at 600 West Chicago Avenue in August 2014, partially offset by the write off of deferred financing fees related to the prepayment of $125.0 million of our 7.50% unsecured senior notes due 2019.

Gain on sale of equity investments. The gain on sale of equity investments in the 2014 period reflects the sale on July 9, 2014 of our entire stake of 22,000,000 common shares of SIR at a per share sales price in excess of our per share carrying value, partially offset by a loss on the sale of our investment in AIC in May 2014.

Gain on issuance of shares by an equity investee. The gain on issuance of shares by an equity investee primarily reflects the issuance of 10,000,000 common shares by SIR during the second quarter of 2014 at prices above our per share carrying value.

Foreign currency exchange loss. The foreign currency exchange loss for the year ended December 31, 2015 relates to the change in foreign currency rates resulting in losses on cash proceeds from the Australian portfolio disposition maintained in an Australian bank account prior to the transfer of cash from our Australian subsidiary to our U.S bank accounts.

Gain on sale of properties. In the first quarter of 2015, we sold two properties and recorded a $5.9 million gain on sale of properties. In the second quarter of 2015, we recorded gains of $41.6 million and $11.9 million related to the sales of an office portfolio in AL, LA, NC, SC and Sorrento Valley Business Park, respectively. In the third quarter of 2015, we recorded gains of $27.0 million, $17.6 million and $7.9 million related to the sales of Illinois Center, 185 Asylum Street and 16th and Race Street, respectively. In the fourth quarter of 2015, we recorded gains of $22.8 million, $9.5 million, $8.4 million and $4.3 million related to the sales of Arizona Center, One Park Square, 4 South 84th Avenue and One South Church Avenue, respectively.

These gains were partially offset by a loss in the second quarter on the sale of properties in Australia of $47.9 million, which is net of the write off of approximately $63.2 million of foreign currency translation adjustments previously recorded in accumulated other comprehensive loss. We also recognized losses in the second quarter of $8.2 million and $2.3 million related to sales of a portfolio of small office and industrial properties and two properties in St. Louis, respectively a loss in the third quarter of $12.5 million related to the sale of a portfolio in upstate New York and losses in the fourth quarter of $3.1 million and $0.4 million related to the sale of a portfolio in Georgia and the sale of 775 Ridge Lake Boulevard, respectively.

Income tax expense. The decrease in income tax expense relates to a decrease in foreign tax expense related to the Australian assets, which were sold in June 2015. The decrease in the foreign tax expense was partially offset by federal income tax expense in the second quarter of 2015 incurred as a result of a taxable built-in gain triggered by the sale of a property that was previously owned by a C corporation.

Equity in earnings of investees. Equity in earnings of investees represents our proportionate share of earnings from SIR during the 2014 period prior to the sale of our entire stake of 22,000,000 common shares of SIR on July 9, 2014 and our proportionate share of earnings from AIC during the 2014 period prior to the sale of our investment in AIC on May 9, 2014.

Income from discontinued operations. In 2015, we adopted ASU 2014-08 and did not classify the properties sold in 2015 as discontinued operations in accordance with this guidance. Income from discontinued operations in the 2014 period relates to 14 properties (43 buildings) sold in 2014.

Loss on asset impairment from discontinued operations. The 2014 loss on asset impairment reflects the write down to estimated fair value less costs to sell for 14 properties (43 buildings) sold during 2014.

Loss on early extinguishment of debt from discontinued operations. The 2014 loss on early extinguishment of debt reflects prepayment premiums and the write off of unamortized discounts and deferred financing fees associated with the repayment of $11.2 million of 6.14% mortgage debt and $8.5 million of 5.78% mortgage debt in June 2014.

Preferred distributions. The decrease in preferred distributions reflects the conversion of 10,264,503 of our series D preferred shares into 10,412,499 of our common shares during the year ended December 31, 2014.

Excess fair value of consideration over carrying value of preferred shares. As a result of the conversion of our series D preferred shares in May 2014, we recorded a preferred distribution of $16.2 million for the excess of the market value of the common shares issued above the carrying value of the series D preferred shares converted.

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RESULTS OF OPERATIONS

Year Ended December 31, 2014, Compared to Year Ended December 31, 2013

	Comparable Properties Results(1)											Other Properties Results(2)						Consolidated Results
	Year Ended December 31,
	2014			2013			$ Change			% Change		2014			2013			2014			2013			$ Change			% Change
	(in thousands)
Rental income	$	691,713		$	686,229		$	5,484		0.8	%	$	(14	)	$	77,033		$	691,699		$	763,262		$	(71,563	)	(9.4	)%
Tenant reimbursements and other income	170,085			176,177			(6,092		)	(3.5	)%	73			13,590			170,158			189,767			(19,609		)	(10.3	)%
Operating expenses	(388,190		)	(393,095		)	4,905			(1.2	)%	208			(16,950		)	(387,982		)	(410,045		)	22,063			(5.4	)%
Net operating income(3)	$	473,608		$	469,311		$	4,297		0.9	%	$	267		$	73,673		473,875			542,984			(69,109		)	(12.7	)%
Other expenses:
Depreciation and amortization																		227,532			234,402			(6,870		)	(2.9	)%
General and administrative																		113,155			80,504			32,651			40.6	%
Loss on asset impairment																		185,067			124,253			60,814			48.9	%
Acquisition related costs																		5			318			(313		)	(98.4	)%
Total other expenses																		525,759			439,477			86,282			19.6	%
Operating income																		(51,884		)	103,507			(155,391		)	(150.1	)%
Interest and other income																		1,561			1,229			332			27.0	%
Interest expense																		(143,230		)	(173,011		)	29,781			(17.2	)%
Gain (loss) on early extinguishment of debt																		4,909			(60,052		)	64,961			(108.2	)%
Gain on sale of equity investment																		171,561			66,293			105,268			158.8	%
Gain on issuance of shares by an equity investee																		17,020			—			17,020			100.0	%
Foreign currency exchange loss																		—			—			—			(100.0	)%
Gain on sale of properties																		—			1,596			(1,596		)	100.0	%
Loss from continuing operations before income taxes and equity in earnings of investees																		(63		)	(60,438		)	60,375			(99.9	)%
Income tax expense																		(3,191		)	(2,634		)	(557		)	21.1	%
Equity in earnings of investees																		24,460			25,754			(1,294		)	(5.0	)%
Income (loss) from continuing operations																		21,206			(37,318		)	58,524			(156.8	)%
Discontinued operations:
Income from discontinued operations																		8,389			6,393			1,996			31.2	%
Loss on asset impairment from discontinued operations																		(2,238		)	(102,869		)	100,631			(97.8	)%
Loss on early extinguishment of debt from discontinued operations																		(3,345		)	(1,011		)	(2,334		)	230.9	%
Net loss on sale of properties from discontinued operations																		—			(22,162		)	22,162			(100.0	)%
Net income (loss)																		24,012			(156,967		)	180,979			(115.3	)%
Net income attributable to noncontrolling interest in consolidated subsidiary																		—			(20,093		)	20,093			(100.0	)%
Net income (loss) attributable to Equity Commonwealth																		24,012			(177,060		)	201,072			(113.6	)%
Preferred distributions																		(32,095		)	(44,604		)	12,509			(28.0	)%
Excess fair value of consideration over carrying value of preferred shares																		(16,205		)	—			(16,205		)	(100.0	)%
Net loss attributable to Equity Commonwealth common shareholders																		$	(24,288	)	$	(221,664	)	$	197,376		(89.0	)%

(1) Comparable properties consist of 156 properties (262 buildings) owned continuously from January 1, 2013 to December 31, 2014.

(2) Other properties consist of properties owned by SIR and GOV.

(3) See Note 4 on page 28 for further information regarding NOI.

We refer to the 156 properties (262 buildings) we owned continuously from January 1, 2013 to December 31, 2014, as comparable properties.  We refer to the properties owned by SIR as other properties.  Our consolidated statements of operations for the years ended December 31, 2014 and 2013 include the operating results of 156 properties for the entire periods, as we owned these properties as of January 1, 2013.  Our consolidated statement of operations for the year ended December 31, 2013 also includes the operating results of properties owned by SIR when SIR was our consolidated subsidiary, which was until July 2, 2013.

Rental income. Rental income decreased $71.6 million in the 2014 period, compared to the 2013 period, due to a decrease of $77.0 million primarily related to the deconsolidation of SIR discussed above, partially offset by an increase at our comparable properties totaling $5.5 million. The increase in comparable property rental income primarily reflects approximately $8.5 million received

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from the settlement of litigation with a former tenant at one of our properties. Rental income includes non-cash straight line rent adjustments totaling $12.5 million in the 2014 period and $31.8 million in the 2013 period, which includes $5.7 million related to SIR, and net reductions for amortization of acquired real estate leases and assumed real estate lease obligations totaling $10.7 million in the 2014 period and $10.3 million in the 2013 period. Rental income also includes the recognition of lease termination fees totaling $4.7 million in the 2014 period and $2.8 million in the 2013 period.

Tenant reimbursements and other income. Tenant reimbursements and other income decreased $19.6 million in the 2014 period, compared to the 2013 period, due to a decrease in tenant reimbursements and other income totaling $13.5 million primarily related to the deconsolidation of SIR discussed above, and a decrease in tenant reimbursements and other income at our comparable properties totaling $6.1 million. The decrease in comparable property tenant reimbursements and other income from our comparable properties primarily reflects decreases in real estate taxes and the related tenant reimbursements at some of our properties.

Operating expenses. The decrease in operating expenses during the 2014 period totaling $22.1 million reflects a decrease in operating expenses totaling $17.2 million primarily related to the deconsolidation of SIR discussed above, and a decrease in operating expenses at our comparable properties totaling $4.9 million. The decrease in operating expenses at our comparable properties primarily reflectsdecreases in real estate tax assessments and reduced rates in certain markets, partially offset by increases in utility expenses and snow removal costs related to the more severe winter season during the 2014 period, compared to the 2013 period.

General and administrative expense. The increase in general and administrative expenses primarily relates to $23.4 million for the shareholder approval of reimbursement of expenses incurred by Related/Corvex in connection with their consent solicitation to remove our former Trustees, $3.6 million of expenses related to the termination and cooperation agreement with RMR, the internalization of our management and an increase of $15.0 million related to business management incentive fees. These increases were partially offset by a $19.6 million decrease related to legal and litigation expenses.

Loss on asset impairment. The loss on asset impairment in the 2014 period primarily includes impairment losses recorded in the fourth quarter of 2014 as a result of the change in the anticipated holding period for certain properties and an impairment loss recorded in the second quarter of 2014 on a property for which we made the decision to cease making loan servicing payments. The loss on asset impairment in the 2013 period reflects the write down to estimated fair value, less costs to sell for properties that were being marketed for sale.

Interest and other income. The increase in interest and other income primarily reflects an increase in interest income due to higher cash balances in the current year.

Interest expense. The decrease in interest expense primarily reflects the repurchase of $670.3 million of our unsecured senior notes pursuant to the tender offer we completed in March 2013, the prepayment of $99.0 million of our 5.75% unsecured senior notes in October 2013, the prepayment of $265.0 million of 5.68% mortgage debt in August 2014, the prepayment of $33.4 million of our 6.40% unsecured notes in September 2014, the prepayment of $125.0 million of our 7.50% unsecured notes in November 2014 and the payment of $100.0 million of our term loan in December 2014.

Gain (loss) on early extinguishment of debt. The gain on early extinguishment of debt in the 2014 period primarily reflects the write-off of unamortized premiums net of deferred financing fees related to the prepayment of $265.0 million of 5.68% mortgage debt in August 2014, partially offset by the write off of deferred financing fees related to the prepayment of $125.0 million of our 7.50% unsecured senior notes due 2019. The loss on early extinguishment of debt in the 2013 period primarily reflects the difference between $726.2 million paid to repurchase $670.3 million of our unsecured senior notes pursuant to the tender offer we completed in March 2013, plus the write off of unamortized discounts and deferred financing fees and expenses.

Gain on sale of equity investment. The gain on sale of equity investment in the 2014 period primarily reflects the sale on July 9, 2014 of our entire stake of 22,000,000 common shares of SIR at a per share sales price in excess of our per share carrying value. The gain on sale of equity investments in the 2013 period reflects the sale in March 2013 of all 9,950,000 common shares of GOV that we owned at a per share sales price in excess of our per share carrying value.

Gain on issuance of shares by an equity investee. The gain on issuance of shares by an equity investee primarily reflects the issuance of 10,000,000 common shares by SIR during the year ended December 31, 2014 at prices above our per share carrying value.

Gain on sale of properties. Gain on sale of properties in the 2013 period reflects a gain of $1.6 million from an eminent domain land taking at one of our properties.

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Income tax expense. The increase in income tax expense reflects higher Australian taxable income in the 2014 period as compared to the 2013 period.

Equity in earnings of investees. Equity in earnings of investees represents our proportionate share of earnings from SIR and AIC during the 2014 period, and from SIR, GOV and AIC during the 2013 period. The decrease in earnings of investees primarily reflects our proportionate share of earnings from SIR since we began accounting for our investment in SIR using the equity method in July 2013, partially offset by the sale of our entire stake of 22,000,000 common shares of SIR on July 9, 2014, the sale of our investment in AIC on May 9, 2014 and our sale in March 2013 of all 9,950,000 common shares that we owned of GOV.

Income from discontinued operations. The increase in income from discontinued operations primarily reflects the decline in depreciation expense from ceasing depreciation when assets are reclassified as held for sale, partially offset by the decline in NOI from 14 properties (43 buildings) that were sold in 2014 and 43 properties (134 buildings) and a land parcel sold during 2013.

Loss on asset impairment from discontinued operations. The 2014 loss on asset impairment reflects the write down to estimated fair value less costs to sell for 14 properties (43 buildings) sold during 2014. The 2013 loss on asset impairment reflects the write down to estimated fair value less costs to sell for 36 properties (76 buildings) sold during the year ended December 31, 2013.

Loss on early extinguishment of debt from discontinued operations. The 2014 loss on early extinguishment of debt reflects prepayment premiums and the write off of unamortized discounts and deferred financing fees associated with the repayment of $11.2 million of 6.14% mortgage debt and $8.5 million of 5.78% mortgage debt in June 2014. The 2013 loss on early extinguishment of debt reflects the write off of unamortized discount and a prepayment premium associated with the prepayment of $7.1 million of 5.76% mortgage debt in December 2013.

Net loss on sale of properties from discontinued operations. Net loss on sale of properties in the 2013 period reflects losses totaling $22.2 million from the sale of 43 properties (134 buildings) and a land parcel during the 2013 period.

Net income attributable to noncontrolling interest in consolidated subsidiary. The decrease in net income attributable to noncontrolling interest in consolidated subsidiary reflects the noncontrolling portion of income from SIR when SIR was our consolidated subsidiary, which was until July 2, 2013.

Preferred distributions. The decrease in preferred distributions in the 2014 period reflects the conversion of 10,264,503 of our series D preferred shares into 10,412,499 of our common shares during the year ended December 31, 2014.

Excess fair value of consideration over carrying value of preferred shares. As a result of the conversion of our series D preferred shares in May 2014, we recorded a preferred distribution of $16.2 million for the excess of the market value of the common shares issued above the carrying value of the series D preferred shares converted.

Inflation

Inflation in the past several years in the United States has been modest. Future inflation might have either positive or negative impacts on our business. Inflation might cause the value of our real estate to increase. Inflation might also cause our costs of equity and debt capital and operating costs to increase. An increase in our capital costs or in our operating costs may result in decreased earnings unless it is offset by increased revenues. Further inflation may permit us to increase rents upon renewal or enter new leases above the previous rent amounts for the leased space.

To mitigate the adverse impact of any increased cost of debt capital in the event of material inflation, we may enter into additional interest rate hedge arrangements in the future. The decision to enter into these agreements will be based on various factors, including the amount of our floating rate debt outstanding, our belief that material interest rate increases are likely to occur, the costs of and our expected benefit from these agreements and upon requirements of our borrowing arrangements.

In periods of rapid inflation, our tenants' operating costs may increase faster than revenues, which may have an adverse impact upon us if our tenants' operating income becomes insufficient to pay our rent. To mitigate the adverse impact of tenant financial distress upon us, we require many of our tenants to provide guarantees or security for our rent.

LIQUIDITY AND CAPITAL RESOURCES

Our Operating Liquidity and Resources

As of December 31, 2015, we had $1.8 billion of cash and cash equivalents.  We expect to use our cash balances, cash flow from our operations and proceeds of future property sales to fund our operations, repay debt, redeem preferred shares,

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make distributions, acquire assets, fund tenant improvements and leasing costs and for other general business purposes.  We believe our cash balances and the cash flow from our operations will be sufficient to fund our ordinary course activities.

Our future cash flows from operating activities will depend primarily upon our:

• ability to maintain or improve the occupancy of, and the rental rates at, our properties;

• ability to control operating and financing cost increases at our properties; and

• ability to purchase additional properties which produce rents, less property operating expenses, in excess of our costs of acquisition capital.

Volatility in energy costs and real estate taxes may cause our future operating costs to fluctuate; however, the impact of these fluctuations is expected to be partially offset by the pass through of operating costs to our tenants pursuant to lease terms, although there can be no assurance that we will be able to successfully offset these costs or that doing so would not negatively impact our competitive position or business. 

Cash flows provided by (used in) operating, investing and financing activities were $181.5 million, $1,648.9 million and $(382.7) million, respectively, for the year ended December 31, 2015, and $224.4 million, $771.2 million and $(847.0) million, respectively, for the year ended December 31, 2014.  Changes in these three categories of our cash flows between 2015 and 2014 are primarily related to real estate improvements, our dispositions of properties, the sale of our SIR common shares during the 2014 period, our purchase of our common shares during the 2015 period, our repayments of debt, and our distributions to our common shareholders during the 2014 period.

Our Investment and Financing Liquidity and Resources

In order to maintain financial flexibility, to fund acquisitions and to meet cash needs that may result from timing differences between our receipt of rents and our desire or need to make distributions and investments or pay operating or capital expenses, we maintain an unsecured revolving credit facility with a group of institutional lenders. On January 29, 2015, we entered into a new credit agreement, pursuant to which the lenders agreed to provide (i) a $750.0 million unsecured revolving credit facility, (ii) a $200.0 million 5-year term loan facility and (iii) a $200.0 million 7-year term loan facility. The new agreement replaced our prior credit agreement, dated as of August 9, 2010, and our prior term loan agreement, dated as of December 16, 2010.  The revolving credit facility has a scheduled maturity date of January 28, 2019, which maturity date may be extended for up to two additional periods of six months at our option subject to satisfaction of certain conditions and the payment of an extension fee of 0.075% of the aggregate amount available under the revolving credit facility. The 5-year term loan and the 7-year term loan have scheduled maturity dates of January 28, 2020 and January 28, 2022, respectively. We used the proceeds of borrowings under the credit agreement to repay all amounts outstanding and due under the previous term loan agreement.

 Borrowings under our revolving credit facility currently bear interest at LIBOR plus a spread, which was 125 basis points as of December 31, 2015.  We also pay a facility fee of 25 basis points per annum on the total amount of lending commitments under our revolving credit facility.  Both the interest rate spread and the facility fee are subject to adjustment based upon changes to our credit ratings.  We are allowed to borrow, repay and reborrow funds available under our revolving credit facility until maturity, and no principal repayment is due until maturity.  As of December 31, 2015, the interest rate payable on borrowings under our revolving credit facility was 1.68%.  As of December 31, 2015, we had no balance outstanding under our revolving credit facility.

Our term loans currently bear interest at a rate of LIBOR plus a spread, which was 140 and 180 basis points for the 5-year and 7-year term loan, respectively, as of December 31, 2015.  The interest rate spread is subject to adjustment based upon changes to our credit ratings.  As of December 31, 2015, the interest rate for the amounts outstanding under our term loan was 1.83% and 2.23% for the 5-year and 7-year term loan, respectively. As of December 31, 2015, our 5-year and 7-year term loans each had balances of $200.0 million.

On December 1, 2015, we repaid at par $116.0 million of 5.24% mortgage debt at 111 Monument Circle. On August 3, 2015, we defeased the outstanding $141.4 million balance of the mortgage loan secured by 111 East Wacker Drive, one of the buildings included in Illinois Center. On June 5, 2015, we prepaid $10.0 million of 7.36% mortgage debt at 2501 20th Place South. On June 3, 2015, we defeased the $38.7 million outstanding balance of the mortgage loan secured by 1320 Main Street. On May 22, 2015, title to 225 Water Street was transferred to the lender pursuant to the consensual foreclosure in full

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satisfaction of the mortgage debt, with a principal balance of $40.1 million. On May 1, 2015, we redeemed at par $138.8 million of our 5.75% senior unsecured notes due 2015.

During the year ended December 31, 2015, we paid an aggregate of $27.9 million of distributions on our series D and series E preferred shares.  On January 26, 2016, we announced that our Board of Trustees declared dividends of $0.40625 per series D preferred share and $0.453125 per series E preferred share, both of which were paid on February 16, 2016 to shareholders of record on February 5, 2016.

On August 24, 2015, our Board of Trustees approved a common share repurchase plan, which authorizes the repurchase of up to $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. On September 14, 2015, our Board of Trustees authorized the repurchase of up to an additional $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. During the year ended December 31, 2015, we purchased and retired 3,410,300 of our common shares at a weighted average price of $25.76 per share for a total investment of $87.8 million.

Our outstanding debt maturities and weighted average interest rates as of December 31, 2015, were as follows (dollars in thousands):

	Scheduled Principal Payments During Period
Year	Unsecured Floating Rate Debt		Unsecured Fixed Rate Debt			Secured Fixed Rate Debt			Total(1)		Weighted Average Interest Rate(2)
2016	$	—	$	139,104	(3)	$	3,346		$	142,450	6.2	%
2017	—		250,000			44,865			294,865		6.2	%
2018	—		250,000			3,847			253,847		6.6	%
2019	—		—			164,613		(4)	164,613		5.7	%
2020	200,000		250,000			1,674			451,674		4.1	%
2021	—		—			25,982			25,982		5.7	%
2022	200,000		—			799			200,799		2.2	%
2023	—		—			702			702		5.7	%
2024	—		—			743			743		5.7	%
2025	—		—			787			787		5.7	%
Thereafter	—		175,000			204			175,204		5.7	%
	$	400,000	$	1,064,104		$	247,562		$	1,711,666	5.1	%

(1) Total debt outstanding as of December 31, 2015, including net unamortized premiums and discounts, equals $1,710,324.

(2) Weighted based on current contractual interest rates.

(3) On February 16, 2016, we redeemed at par $139.1 million of our 6.25% senior unsecured notes due 2016.

(4) We have a mortgage loan with an aggregate outstanding principal balance as of December 31, 2015 of $169,612 secured by 1735 Market Street that matures in 2019. Interest on this loan is payable at a rate equal to LIBOR plus 2.625%, but the interest rate has been fixed by a cash flow hedge which sets the rate at approximately 5.66% per year until December 1, 2016.

For a description of our financing activities since January 1, 2015, see “Financing Activities” above.  Also, for further information about our indebtedness, see Note 9 to the Notes to Consolidated Financial Statements in Part IV, Item 15 of this Annual Report on Form 10-K, which is incorporated herein by reference.

When significant amounts are outstanding under our revolving credit facility, or as the maturity dates of our revolving credit facility and term debts approach, we explore alternatives for the repayment of amounts due. Such alternatives may include incurring additional debt and issuing new equity securities, extending the maturity of our revolving credit facility and entering into a new revolving credit facility. We have an effective shelf registration statement that allows us to issue public securities on an expedited basis, but it does not assure that there will be buyers for such securities.

We believe that we will have access to various types of financings, including debt or equity offerings, to fund our future acquisitions and to pay our debts and other obligations as they become due. The completion and the costs of our future debt transactions will depend primarily upon market conditions and our credit ratings. We have no control over market conditions. Our credit ratings depend upon evaluations by credit rating agencies of our business practices and plans and, in particular,

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whether we appear to have the ability to maintain our earnings, to space our debt maturities and to balance our use of debt and equity capital so that our financial performance and leverage ratios afford us flexibility to withstand any reasonably foreseeable adverse changes. We intend to conduct our business activities in a manner which will continue to afford us reasonable access to capital for investment and financing activities. However, there can be no assurance regarding our credit ratings or our ability to complete any debt or equity offerings or that our cost of any future public or private financings will not increase.

During the year ended December 31, 2015, we disposed of 91 properties (135 buildings) and one land parcel with a combined 18.9 million square feet for an aggregate sales price of $2.0 billion, excluding closing costs. For more information regarding these transactions, see Note 4 to Notes to Consolidated Financial Statements in Part IV, Item 15 of this Annual Report on Form 10-K, which is incorporated herein by reference.

During the years ended December 31, 2015, 2014 and 2013 amounts capitalized at our properties, including properties sold and properties classified in discontinued operations, and properties owned by SIR when SIR was a consolidated subsidiary of ours, for tenant improvements, leasing costs, building improvements and development and redevelopment activities were as follows (amounts in thousands):

	Years Ended December 31,
	2015		2014		2013
Tenant improvements(1)	$	54,272	$	58,238	$	78,806
Leasing costs(2)	44,590		37,091		41,652
Building improvements(3)	21,403		33,370		44,121

(1) Tenant improvements include capital expenditures to improve tenants’ space.

(2) Leasing costs include leasing related costs such as brokerage commissions and legal expenses.

(3) Building improvements generally include expenditures to replace obsolete building components and expenditures that extend the useful life of existing assets. Tenant-funded capital expenditures are excluded.

During the year ended December 31, 2015, commitments made for expenditures in connection with leasing space at our properties were as follows (dollar and square foot measures in thousands, except per square foot measures):

	New Leases		Renewals		Total
Rentable square feet leased during the period	2,060		2,816		4,876
Tenant improvements and leasing commissions	$	99,925	$	56,466	$	156,391
Tenant improvements and leasing commissions per rentable square foot	$	48.52	$	20.05	$	32.08
Weighted average lease term by square foot (years)	8.5		4.7		6.3
Tenant improvements and leasing commissions per rentable square foot per year	$	5.54	$	4.20	$	5.06

Debt Covenants

Our unsecured debt obligations at December 31, 2015 were our term loans and our publicly issued senior unsecured notes. Our public debt indenture and related supplements, our revolving credit facility and our term loan agreement contain a number of financial ratio covenants which generally restrict our ability to incur debts, in excess of calculated amounts, restrict our ability to make distributions under certain circumstances and require us to maintain other financial ratios.  At December 31, 2015, we believe we were in compliance with all covenants under our indenture and related supplements, and we believe we were in compliance with all respective covenants under our revolving credit facility and our term loan agreement.  In addition to our unsecured debt obligations, we had $249.7 million (including net unamortized premiums and discounts) of mortgage notes outstanding at December 31, 2015.

None of our indenture and related supplements, our revolving credit facility and term loan agreement, or our mortgage notes contain provisions for acceleration or require us to provide collateral security which could be triggered by our debt ratings.  However, our senior debt rating is used to determine the interest rate and the fees payable under our revolving credit facility and our term loan agreement.

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OFF BALANCE SHEET ARRANGEMENTS

As of December 31, 2015, we had no off balance sheet arrangements that have had or that we expect would be reasonably likely to have a future material effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources.  We had no swaps or hedges as of December 31, 2015, other than the cash flow hedge associated with our $169.6 million of mortgage debt described in Note 13 to the Notes to Consolidated Financial Statements and under “Quantitative and Qualitative Disclosures About Market Risk” in Part II, Item 7A of this Annual Report on Form 10-K.

CONTRACTUAL OBLIGATIONS

As of December 31, 2015, our contractual obligations were as follows (dollars in thousands):

	Payment Due by Period
Contractual Obligations	Total		Less than 1 year		1-3 years		3-5 years		More than 5 years
Long term debt obligations	$	1,711,666	$	142,450	$	548,712	$	616,287	$	404,217
Tenant related obligations(1)	118,933		85,976		32,095		—		862
Projected interest expense(2)	478,182		84,577		104,557		66,289		222,759
Operating lease obligations—ground lease and corporate office space(3)	139,851		1,957		4,649		4,754		128,491
Total	$	2,448,632	$	314,960	$	690,013	$	687,330	$	756,329

(1) Committed tenant related obligations include leasing commissions and tenant improvements and are based on leases in effect as of December 31, 2015.

(2) Projected interest expense is attributable to only the long term debt obligations listed above at existing rates and is not intended to project future interest costs which may result from debt prepayments, new debt issuances or changes in interest rates. Projected interest expense does not include interest that may become payable related to future borrowings under our revolving credit facility.

(3) Ground lease obligation represents payments due from us pursuant to an operating ground lease at 111 River Street, where we are the lessee.

FUNDS FROM OPERATIONS (FFO) AND NORMALIZED FFO

We compute FFO in accordance with standards established by the National Association of Real Estate Investment Trusts (NAREIT). NAREIT defines FFO as net income (loss), calculated in accordance with GAAP, excluding real estate depreciation and amortization, gains (or losses) from sales of depreciable property, impairment of depreciable real estate, and our portion of these items related to equity investees and noncontrolling interests.  Our calculation of Normalized FFO differs from NAREIT’s definition of FFO because we exclude certain items that we view as nonrecurring or impacting comparability from period to period.  We consider FFO and Normalized FFO to be appropriate measures of operating performance for a REIT, along with net income, net income attributable to Equity Commonwealth common shareholders, operating income and cash flow from operating activities.

We believe that FFO and Normalized FFO provide useful information to investors because by excluding the effects of certain historical amounts, such as depreciation expense, FFO and Normalized FFO may facilitate a comparison of our operating performance between periods and with other REITs.  FFO and Normalized FFO do not represent cash generated by operating activities in accordance with GAAP and should not be considered as alternatives to net income, net income attributable to Equity Commonwealth common shareholders, operating income or cash flow from operating activities, determined in accordance with GAAP, or as indicators of our financial performance or liquidity, nor are these measures necessarily indicative of sufficient cash flow to fund all of our needs.  These measures should be considered in conjunction with net income, net income attributable to Equity Commonwealth common shareholders, operating income and cash flow from operating activities as presented in our consolidated statements of operations, consolidated statements of comprehensive income and consolidated statements of cash flows.  Other REITs and real estate companies may calculate FFO and Normalized FFO differently than we do.

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The following table provides a reconciliation of net income (loss) attributable to Equity Commonwealth to FFO attributable to Equity Commonwealth common shareholders and a calculation to Normalized FFO attributable to Equity Commonwealth common shareholders (in thousands):

	Years Ended December 31,
	2015			2014			2013
Reconciliation to FFO:
Net income (loss) attributable to Equity Commonwealth	$	99,857		$	24,012		$	(177,060	)
Depreciation and amortization from continuing operations	194,001			227,532			234,402
Depreciation and amortization from discontinued operations	—			—			12,550
Loss on asset impairment from continuing operations	17,162			185,067			124,253
Loss on asset impairment from discontinued operations	—			2,238			102,869
FFO from equity investees	—			33,007			33,564
Net income attributable to noncontrolling interest	—			—			20,093
FFO attributable to noncontrolling interest	—			—			(26,270		)
Gain on sale of properties	(84,421		)	—			(1,596		)
Net loss on sale of properties from discontinued operations	—			—			22,162
Equity in earnings of investees	—			(24,460		)	(25,754		)
FFO attributable to Equity Commonwealth	226,599			447,396			319,213
Preferred distributions	(27,924		)	(32,095		)	(44,604		)
FFO attributable to Equity Commonwealth common shareholders	$	198,675		$	415,301		$	274,609
Reconciliation to Normalized FFO:
FFO available for Equity Commonwealth common shareholders	$	198,675		$	415,301		$	274,609
Recurring adjustments:
Lease value amortization from continuing operations	7,515			10,650			10,310
Lease value amortization from discontinued operations	—			—			(775		)
Straight line rent from continuing operations	(5,328		)	(12,531		)	(31,791		)
Straight line rent from discontinued operations	—			(226		)	562
(Gain) loss on early extinguishment of debt from continuing operations	(6,661		)	(4,909		)	60,052
Loss on early extinguishment of debt from discontinued operations	—			3,345			1,011
Minimum cash rent from direct financing lease	7,451			8,128			8,125
Gain on sale of equity investment	—			(171,561		)	(66,293		)
Gain on issuance of shares by an equity investee	—			(17,020		)	—
Interest earned from direct financing lease	(407		)	(787		)	(1,128		)
Normalized FFO from equity investees, net of FFO	—			(3,353		)	(2,530		)
Normalized FFO from noncontrolling interest, net of FFO	—			—			1,987
Other items which affect comparability:
Shareholder litigation costs and transition-related expenses	10,869			37,681			29,874
Transition services fee	2,679			3,600			—
Acquisition related costs	—			5			318
Gain on sale of securities	(3,080		)	—			—
Foreign currency exchange loss	8,857			—			—
Normalized FFO attributable to Equity Commonwealth common shareholders	$	220,570		$	268,323		$	284,331

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PROPERTY NET OPERATING INCOME (NOI)

We use property net operating income, or NOI, to evaluate the performance of our properties. We define NOI as income from our real estate including lease termination fees received from tenants less our property operating expenses. NOI excludes amortization of capitalized tenant improvement costs and leasing commissions.

The following table includes the reconciliation of NOI to net income, the most directly comparable financial measure under GAAP reported in our consolidated financial statements.  We consider NOI to be an appropriate supplemental measure to net income because it may help both investors and management to understand the operations of our properties.  We use NOI internally to evaluate property level performance, and we believe that NOI provides useful information to investors regarding our results of operations because it reflects only those income and expense items that are incurred at the property level and may facilitate comparisons of our operating performance between periods and with other REITs.  NOI does not represent cash generated by operating activities in accordance with GAAP and should not be considered as an alternative to net income, net income attributable to Equity Commonwealth common shareholders, operating income or cash flow from operating activities, determined in accordance with GAAP, or as an indicator of our financial performance or liquidity, nor is this measure necessarily indicative of sufficient cash flow to fund all of our needs.  This measure should be considered in conjunction with net income, net income attributable to Equity Commonwealth common shareholders, operating income and cash flow from operating activities as presented in our consolidated statements of operations, consolidated statements of comprehensive income and consolidated statements of cash flows.  Other REITs and real estate companies may calculate NOI differently than we do. 

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A reconciliation of NOI to net income (loss) for the years ended December 31, 2015, 2014 and 2013, is as follows (in thousands):

	Year Ended December 31,
	2015			2014			2013
Rental income	$	570,382		$	691,699		$	763,262
Tenant reimbursements and other income	144,509			170,158			189,767
Operating expenses	(324,948		)	(387,982		)	(410,045		)
NOI	$	389,943		$	473,875		$	542,984
NOI	$	389,943		$	473,875		$	542,984
Depreciation and amortization	(194,001		)	(227,532		)	(234,402		)
General and administrative	(57,457		)	(113,155		)	(80,504		)
Loss on asset impairment	(17,162		)	(185,067		)	(124,253		)
Acquisition related costs	—			(5		)	(318		)
Operating income (loss)	121,323			(51,884		)	103,507
Interest and other income	5,989			1,561			1,229
Interest expense	(107,316		)	(143,230		)	(173,011		)
Gain (loss) on early extinguishment of debt	6,661			4,909			(60,052		)
Gain on sale of equity investments	—			171,561			66,293
Gain on issuance of shares by an equity investee	—			17,020			—
Foreign currency exchange loss	(8,857		)	—			—
Gain on sale of properties	84,421			—			1,596
Income (loss) from continuing operations before income taxes and equity in earnings of investees	102,221			(63		)	(60,438		)
Income tax expense	(2,364		)	(3,191		)	(2,634		)
Equity in earnings of investees	—			24,460			25,754
Income (loss) from continuing operations	99,857			21,206			(37,318		)
Income from discontinued operations	—			8,389			6,393
Loss on asset impairment from discontinued operations	—			(2,238		)	(102,869		)
Loss on early extinguishment of debt from discontinued operations	—			(3,345		)	(1,011		)
Net loss on sale of properties from discontinued operations	—			—			(22,162		)
Net income (loss)	$	99,857		$	24,012		$	(156,967	)

CRITICAL ACCOUNTING POLICIES

Our critical accounting policies are those that will have the most impact on the reporting of our financial condition and results of operations and those requiring significant judgments and estimates. We believe that our judgments and estimates are consistently applied and produce financial information that fairly presents our results of operations. Our most critical accounting policies involve our investments in real property. These policies affect our:

• allocation of purchase price among various asset categories and the related impact on the recognition of rental income and depreciation and amortization expense;

• assessment of the carrying values and impairments of long lived assets; and

• classification of leases.

We allocate the consideration paid for our properties among land, buildings and improvements and, for properties that qualify as acquired businesses under the Business Combinations Topic of The FASB Accounting Standards Codification™, identified intangible assets and liabilities, consisting of the value of above market and below market leases, the value of acquired in place leases and the value of tenant relationships. Purchase price allocations and the determination of useful lives are based on our estimates and, under some circumstances, studies from independent real estate appraisal firms to provide

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market information and evaluations that are relevant to our purchase price allocations and determinations of useful lives; however, we are ultimately responsible for the purchase price allocations and determination of useful lives.

We allocate the consideration to land, buildings and improvements based on a determination of the fair values of these assets assuming the property is vacant. We determine the fair value of a property using methods that we believe are similar to those used by independent appraisers. Purchase price allocations to above market and below market leases are based on the estimated present value (using an interest rate which reflects our assessment of the risks associated with the leases acquired) of the difference between (1) the contractual amounts to be paid pursuant to the acquired in place leases and (2) our estimate of fair market lease rates for the corresponding leases, measured over a period equal to the remaining non-cancelable terms of the respective leases. Purchase price allocations to acquired in place leases and tenant relationships are determined as the excess of (1) the purchase price paid for a property after adjusting existing acquired in place leases to estimated market rental rates over (2) the estimated fair value of the property as if vacant. We aggregate this value between acquired in place lease values and tenant relationships based on our evaluation of the specific characteristics of each tenant's lease; however, the value of tenant relationships has not been separated from acquired in place lease value for our properties because we believe such value and related amortization expense is immaterial for acquisitions reflected in our historical financial statements. We consider certain factors in performing these analyses including estimates of carrying costs during the expected lease up periods, including real estate taxes, insurance and other operating income and expenses and costs to execute similar leases in current market conditions, such as leasing commissions, legal and other related costs. If we believe the value of tenant relationships is material in the future, those amounts will be separately allocated and amortized over the estimated lives of the relationships. We recognize the excess, if any, of the consideration paid over amounts allocated to land, buildings and improvements and identified intangible assets and liabilities as goodwill and we recognize gains if amounts allocated exceed the consideration paid.

We compute depreciation expense using the straight line method over estimated useful lives of up to 40 years for buildings and improvements and up to 12 years for personal property. We do not depreciate the allocated cost of land. We amortize capitalized above market lease values (presented in our consolidated balance sheets as acquired real estate leases) as a reduction to rental income over the remaining non-cancelable terms of the respective leases. We amortize capitalized below market lease values (presented in our consolidated balance sheets as assumed real estate lease obligations) as an increase to rental income over the remaining terms of the respective leases. We amortize the value of acquired in place leases exclusive of the value of above market and below market in place leases to expense over the remaining non-cancelable periods of the respective leases. If a lease is terminated prior to its stated expiration, all unamortized amounts relating to that lease are written off. Purchase price allocations require us to make certain assumptions and estimates. Incorrect assumptions and estimates may result in inaccurate depreciation and amortization charges over future periods.

We periodically evaluate our properties for possible impairments. Impairment indicators may include declining tenant occupancy, lack of progress releasing vacant space, tenant bankruptcies, low long term prospects for improvement in property performance, weak or declining tenant profitability, cash flow or liquidity, our decision to dispose of an asset before the end of its estimated useful life and legislative, market or industry changes that could permanently reduce the value of a property. If indicators of impairment are present, we evaluate the carrying value of the related property by comparing it to the expected future undiscounted cash flows to be generated from that property. If the sum of these expected future cash flows is less than the carrying value, we reduce the net carrying value of the property to its estimated fair value. This analysis requires us to judge whether indicators of impairment exist and to estimate likely future cash flows. Projections of expected future operating cash flows require that we estimate future market rental revenue amounts subsequent to the expiration of current lease agreements, future property operating expenses, the number of months it takes to re-lease the property, and the number of years the property is held for investment, among other factors. The subjectivity of assumptions used in the future cash flow analysis, including discount rates, could result in an incorrect assessment of the property's fair value and could result in the misstatement of the carrying value of our real estate assets and net income (loss).

Each time we enter a new lease or materially modify an existing lease we evaluate its classification as either a capital or operating lease. The classification of a lease as capital or operating affects the carrying value of a property, as well as our recognition of rental payments as revenue. These evaluations require us to make estimates of, among other things, the remaining useful life and fair market value of a leased property, appropriate discount rates and future cash flows. Incorrect assumptions or estimates may result in misclassification of our leases.

These policies involve significant judgments made based upon experience, including judgments about current valuations, ultimate realizable value, estimated useful lives, salvage or residual value, the ability and willingness of our tenants to perform their obligations to us, current and future economic conditions and competitive factors in the markets in which our properties are located. Competition, economic conditions and other factors may cause occupancy declines in the future. In the future, we may need to revise our carrying value assessments to incorporate information which is not now known, and such revisions

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could increase or decrease our depreciation expense related to properties we own, result in the classification of our leases as other than operating leases or decrease the carrying values of our assets.

RELATED PERSON TRANSACTIONS

We have engaged in certain related person transactions during the years ended December 31, 2015 and December 31, 2014, both prior to and following our Special Meeting at which our new Board of Trustees was elected. Following the Special Meeting, we entered into transactions with certain of our existing Trustees and executive officers and shareholders owning 5% or more of our common shares, or with persons or entities associated with such persons.

We entered into a one-year license agreement for office space with an entity associated with Mr. Zell, our Chairman, and Mr. Helfand, our President and Chief Executive Officer for approximately $0.2 million for the year. On May 4, 2015 and November 2, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the license agreement through November 30, 2015 and January 31, 2016, respectively. The license fee payment is approximately $0.1 million for the extended term. The extension of the license agreement was terminated as of December 30, 2015.

We entered into a one-year lease with one three-month renewal option for office space with an entity associated with Mr. Zell for approximately $0.2 million for the initial term, which lease was terminated, effective January 31, 2015. We also entered into a sublease agreement for office space, the landlord of which is an entity associated with Mr. Zell, for approximately $0.2 million for the initial term of approximately seven months. On May 4, 2015 and November 2, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the sublease through November 30, 2015 and January 31, 2016, respectively. The sublease payment is approximately $0.2 million for the extended term. The extension of the sublease was terminated as of December 30, 2015.

In 2015, we entered into a lease for office space with an entity associated with Mr. Zell, for approximately $0.5 million for the initial year beginning in 2016, and $0.8 million annually thereafter. Effective February 1, 2016, we entered into a lease for storage space with an entity associated with Mr. Zell for a nominal amount.

We believe that the foregoing transactions with our existing Trustees and executive officers are on market terms. 

At the Special Meeting our shareholders voted to approve the reimbursement of approximately $33.5 million of expenses incurred by Related Fund Management, LLC and Corvex Management LP, which we refer to together as Related/Corvex, in connection with their consent solicitations to remove our former Trustees and elect the new Board of Trustees and to engage in related litigation. At the time the reimbursement was approved, Related/Corvex, according to them, owned approximately 5.7% in the aggregate of our common shares. Approximately $16.7 million was paid and expensed during the year ended December 31, 2014.  Approximately $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period after the date on which the reimbursement was approved by shareholders, and the remaining approximately $8.4 million will be reimbursed only if the average closing price of our common shares is at least $26.00 (as adjusted for any share splits or share dividends) during the one year period between the first and second anniversaries of the date on which the reimbursement was approved by shareholders. The average closing price of our common shares was at least $26.00 during the first one year period after the date on which the reimbursement was approved by shareholders, and in August 2015 we paid $8.4 million to Related/Corvex. As these future potential payments represent a “derivative liability”, we expensed approximately $9.0 million during the year ended December 31, 2015. The fair value of this derivative liability on December 31, 2015 was $7.2 million. The total expense of $9.0 million incurred during the year ended December 31, 2015, is included in general and administrative expenses in our consolidated financial statements.

Prior to the election of our new Board of Trustees at the Special Meeting and the appointment of our current executive officers following the Special Meeting on July 31, 2014, we had historical transactions with certain of our former Trustees, former executive officers, RMR, SIR, AIC and other companies to which RMR provides management services and others affiliated with them. Certain of these transactions continued following the Special Meeting.

Effective September 30, 2014, we terminated our business and property management relationships with RMR for our U.S. properties pursuant to a termination and cooperation agreement, which we refer to as the Cooperation Agreement. Pursuant to the Cooperation Agreement, through February 28, 2015, RMR and RMR Australia, which we refer to together as Manager, agreed to use best efforts to assist us in the transition of our management and operations. We paid Manager $1.2 million per month for transition services from October 1, 2014 to February 28, 2015, which included continued management and other services for the Australian assets pursuant to an existing management agreement, or the Australia Management Agreement. Beginning March 1, 2015, we agreed to pay Manager $0.1 million per month until we no longer required such services or until

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the Australia Management Agreement was terminated, which was terminated in the third quarter of 2015, effective October 31, 2015. The $2.7 million incurred pursuant to the Cooperation Agreement for the year ended December 31, 2015 is included in general and administrative expenses in our consolidated financial statements and is net of certain amounts due from RMR. There is no future obligation to pay any fees to Manager.

For further information about these and other such relationships and related person transactions, see Note 19 to the Notes to Consolidated Financial Statements included in Part IV, Item 15 of this Annual Report on Form 10-K, which is incorporated herein by reference, and the section captioned "Business" above in Part I, Item 1 of this Annual Report on Form 10-K. In addition, for more information about these transactions and relationships and about the risks that may arise as a result of these and other related person transactions and relationships, please see elsewhere in this Annual Report on Form 10-K, including "Forward Looking Statements" and Part I, Item 1A, "Risk Factors." Our filings with the SEC, including our Annual Report and our Information Statements, are available at the SEC’s website at www.sec.gov. Copies of certain of our agreements with these related parties, including our business management agreements and property management agreements with RMR and RMR Australia, various agreements we have entered into with GOV and SIR and the shareholders agreement with AIC and its shareholders, are publicly available as exhibits to our public filings with the SEC and accessible at the SEC’s website.

Item 7A.  Quantitative and Qualitative Disclosures About Market Risk.

We are exposed to risks associated with market changes in interest rates.

Interest Rate Risk

We manage our exposure to interest rate risk by monitoring available financing alternatives. Other than as described below, we do not currently foresee any significant changes in our exposure to fluctuations in interest rates or in how we manage this exposure in the near future.

At December 31, 2015, our outstanding fixed rate debt consisted of the following senior unsecured notes and secured mortgage notes (dollars in thousands):

Senior Unsecured Notes:

Debt	Principal Balance(1)		Annual Interest Rate(1)		Annual Interest Expense(1)		Maturity	Interest Payment Due
6.250% senior unsecured notes due 2016(2)	$	139,104	6.25	%	$	8,694	8/15/2016	Semi-Annually
6.250% senior unsecured notes due 2017	250,000		6.25	%	15,625		6/15/2017	Semi-Annually
6.650% senior unsecured notes due 2018	250,000		6.65	%	16,625		1/15/2018	Semi-Annually
5.875% senior unsecured notes due 2020	250,000		5.88	%	14,688		9/15/2020	Semi-Annually
5.750% senior unsecured notes due 2042	175,000		5.75	%	10,063		8/1/2042	Quarterly
	$	1,064,104			$	65,695

(1) The principal balance, annual interest rate and annual interest expense are the amounts stated in the applicable contracts.  In accordance with GAAP, our carrying values and recorded interest expense may differ from these amounts because of market conditions and issuance costs at the time we issued these debts.  For more information, see Note 9 to the Notes to Consolidated Financial Statements in Part IV, Item 15 of this Annual Report on Form 10-K.

(2) On February 16, 2016, we redeemed at par $139.1 million of our 6.25% senior unsecured notes due 2016.

No principal repayments are due under our senior unsecured notes until maturity.

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Secured Mortgage Notes:

Debt	Principal Balance(1)		Annual Interest Rate(1)			Annual Interest Expense(1)		Maturity	Interest Payment Due
Parkshore Plaza	$	41,275	5.67	%		$	2,373	5/1/2017	Monthly
1735 Market Place	169,612		5.66	%	(2)	9,650		12/2/2019	Monthly
206 East 9th Street	27,515		5.69	%		1,601		1/5/2021	Monthly
33 Stiles Lane	2,785		6.75	%		201		3/1/2022	Monthly
97 Newberry Road	6,375		5.71	%		378		3/1/2026	Monthly
	$	247,562				$	14,203

(1) The principal balance, annual interest rate and annual interest expense are the amounts stated in the applicable contracts.  In accordance with GAAP, our carrying values and recorded interest expense may differ from these amounts because of market conditions and issuance costs at the time we assumed or issued these debts.  For more information, see Note Note 9 to the Notes to Consolidated Financial Statements in Part IV, Item 15 of this Annual Report on Form 10-K.

(2) Interest on this loan is payable at a rate equal to a spread over LIBOR, but the interest rate has been fixed by a cash flow hedge which sets the rate at approximately 5.66% until December 1, 2016.  The floating interest rate at December 31, 2015 was 3.05%.

Some of our secured notes require principal and interest payments through maturity pursuant to amortization schedules, and some of our secured notes require interest only payments through maturity.

Swap Agreements

We have interest rate swap agreements to manage our interest rate risk exposure on $169.6 million of mortgage notes due 2019, which require us to pay interest at a rate equal to a spread over LIBOR.  The interest rate swap agreements utilized by us effectively modify our exposure to interest rate risk arising from this floating rate mortgage loan by converting this floating rate debt to a fixed rate through December 1, 2016, thus reducing the impact of interest rate changes on future interest expense.  These agreements involve the receipt of floating rate amounts in exchange for fixed rate interest payments over the life of the agreements.  Approximately 9.9% ($169.6 million) of our total outstanding debt had interest payments designated as hedged transactions to interest rate swap agreements at December 31, 2015.  As of December 31, 2015, the fair value of our derivative instruments included in accounts payable and accrued expenses and cumulative other comprehensive loss in our consolidated balance sheet totaled $3.7 million.

Fixed Rate Debt

Because our fixed rate unsecured and secured notes bear interest at fixed rates, changes in market interest rates during the term of these debts will not affect our interest obligations.  If all of these notes were refinanced at interest rates which are 100 basis points higher or lower than shown above, our per annum interest cost would increase or decrease, respectively, by approximately $13.1 million.

Each of our fixed rate unsecured debt arrangements and some of our secured debt arrangements allow us to make repayments earlier than the stated maturity date.  In some cases, we are not allowed to make early repayment prior to a cutoff date, and we are generally allowed to make prepayments only at a premium equal to a make whole amount, as defined, which is generally designed to preserve a stated yield to the note holder.  Also, we have repurchased and retired some of our outstanding debts and we may do so again in the future.  These prepayment rights and our ability to repurchase and retire outstanding debt may afford us opportunities to mitigate the risk of refinancing our debts at maturity at higher rates by refinancing prior to maturity.

Floating Rate Debt

At December 31, 2015, our unhedged floating rate debt consisted of our term loans.  Our $200.0 million 5-year term loan matures in January 2020 and our $200.0 million 7-year term loan matures in January 2022.  Borrowings under our revolving credit facility and term loan are in U.S. dollars and bear interest at LIBOR plus spreads that are subject to adjustment based upon changes to our credit ratings.  Accordingly, we are vulnerable to changes in U.S. dollar based short term rates, specifically

44

LIBOR.  In addition, upon renewal or refinancing of our revolving credit facility or term loan, we are vulnerable to increases in interest rate premiums due to market conditions or our perceived credit risk.  Generally, a change in market interest rates would not affect the value of these floating rate debts, but would affect our operating results.  The following table presents the impact a 100 basis point increase in interest rates would have on our floating rate interest expense as of December 31, 2015 (dollars in thousands):

	Impact of Changes in Interest Rates
	Interest Rate Per Year(1)	Outstanding Debt		Total Interest Expense Per Year
Term loans at December 31, 2015	1.83%/2.23%	$	400,000	$	8,118
100 basis point increase	2.83%/3.23%	$	400,000	$	12,118

(1) Based on the interest rates and outstanding borrowings of our floating rate debt as of December 31, 2015.

Foreign Currency Risk

Prior to the sale of our Australian portfolio, there was a risk that our financial results were affected by changes in currency exchange rates.  As a result of the sale of our Australian portfolio, our primary exposure to foreign currency exchange rates subsequent to the June 2015 disposition related to the translation of the cash and cash equivalent balance at our Australian subsidiary from Australian dollars into U.S. dollars. 

Item 8.    Financial Statements and Supplementary Data.

The information required by Item 8 is included in Item 15 of this Annual Report on Form 10-K.

Item 9.    Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

None.

Item 9A.    Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this report, our management carried out an evaluation, under the supervision and with the participation of our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures pursuant to Rules 13a-15 and 15d-15 under the Exchange Act. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of December 31, 2015.

Changes in Internal Control Over Financial Reporting

There have been no changes in our internal control over financial reporting during the quarter ended December 31, 2015, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Management Report on Assessment of Internal Control Over Financial Reporting

We are responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control system is designed to provide reasonable assurance to our management and Board of Trustees regarding the preparation and fair presentation of published financial statements. All internal control systems, no matter how well designed, have inherent limitations. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation.

Our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2015. In making this assessment, it used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) in Internal Control—Integrated Framework. Based on our assessment, we believe that, as of December 31, 2015 our internal control over financial reporting is effective.

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Ernst & Young LLP, the independent registered public accounting firm that audited our 2015 consolidated financial statements included in this Annual Report on Form 10-K, has issued an attestation report on our internal control over financial reporting. The report appears elsewhere herein.

Item 9B.    Other Information.

None.

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PART III

Item 10.    Directors, Executive Officers and Corporate Governance.

Our Code of Business Conduct and Ethics applies to all our representatives, including our officers and Trustees. Our Code of Business Conduct and Ethics is posted on our website, www.eqcre.com. A printed copy of our Code of Business Conduct and Ethics is also available free of charge to any person who requests a copy by writing to our Secretary, Equity Commonwealth, Two North Riverside Plaza, Suite 2100, Chicago, IL 60606. We intend to disclose any amendments or waivers to our Code of Business Conduct and Ethics applicable to our principal executive officer, principal financial officer, principal accounting officer or controller (or any person performing similar functions) on our website.

The remainder of the information required by Item 10 is incorporated by reference to our definitive Proxy Statement.

Item 11.    Executive Compensation.

The information required by Item 11 is incorporated by reference to our definitive Proxy Statement.

Item 12.    Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The information required by Item 12 is incorporated by reference to our definitive Proxy Statement.

Item 13.    Certain Relationships and Related Transactions, and Director Independence.

The information required by Item 13 is incorporated by reference to our definitive Proxy Statement.

Item 14.    Principal Accountant Fees and Services.

The information required by Item 14 is incorporated by reference to our definitive Proxy Statement.

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PART IV

Item 15.    Exhibits and Financial Statement Schedules.

(a) Index to Financial Statements and Financial Statement Schedules

The following consolidated financial statements and financial statement schedules of Equity Commonwealth are included on the pages indicated:

	Page
Reports of Independent Registered Public Accounting Firm	F-1
Consolidated Balance Sheets	F-3
Consolidated Statements of Operations	F-4
Consolidated Statements of Comprehensive Income (Loss)	F-5
Consolidated Statements of Shareholders' Equity	F-6
Consolidated Statements of Cash Flows	F-8
Notes to Consolidated Financial Statements	F-10
Schedule II—Valuation and Qualifying Accounts	S-1
Schedule III—Real Estate and Accumulated Depreciation	S-2
Schedule IV—Mortgage Loans on Real Estate	S-6

All other schedules for which provision is made in the applicable accounting regulations of the SEC are not required under the related instructions, or are inapplicable, and therefore have been omitted.

(b) Exhibits

Exhibit  Number	Description
3.1	Articles of Amendment and Restatement of Declaration of Trust of the Company, dated July 1, 1994, as amended to date. (Incorporated by reference to the Company’s Current Report on Form 8-K filed August 1, 2014.)
3.2	Articles Supplementary, dated October 10, 2006. (Incorporated by reference to the Company’s Current Report on Form 8-K filed October 11, 2006.)
3.3	Articles Supplementary, dated May 31, 2011. (Incorporated by reference to the Company’s Current Report on Form 8-K filed May 31, 2011.)
3.4	Second Amended and Restated Bylaws of the Company, adopted July 31, 2014. (Incorporated by reference to the Company’s Current Report on Form 8-K filed August 1, 2014.)
4.1	Form of Common Share Certificate. (Incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2014.)
4.2	Form of 61/2% Series D Cumulative Convertible Preferred Share Certificate. (Incorporated by reference to the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.)
4.3	Form of 71/4% Series E Cumulative Redeemable Preferred Share Certificate. (Incorporated by reference to the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.)

48

Exhibit  Number	Description
4.4	Indenture, dated as of July 9, 1997, between the Company and State Street Bank and Trust Company, as Trustee. (Incorporated by reference to the Company’s Annual Report on Form 10-K for the year ended December 31, 1997, File Number 001-09317.)
4.5	Supplemental Indenture No. 14, dated as of August 5, 2004, between the Company and U.S. Bank, relating to the Company’s 6.25% Senior Notes due 2016, including form thereof. (Incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2004, File Number 001-09317.)
4.6	Supplemental Indenture No. 17, dated as of June 25, 2007, between the Company and U.S. Bank, relating to the Company’s 6.25% Senior Notes due 2017, including form thereof. (Incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007, File Number 001-09317.)
4.7	Supplemental Indenture No. 18, dated as of September 18, 2007, between the Company and U.S. Bank, relating to the Company’s 6.65% Senior Notes due 2018, including form thereof. (Incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2007, File Number 001-09317.)
4.8	Supplemental Indenture No. 20, dated as of September 17, 2010, between the Company and U.S. Bank, relating to the Company’s 5.875% Senior Notes due 2020, including form thereof. (Incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010.)
4.9	Supplemental Indenture No. 21, dated as of July 25, 2012, between the Company and U.S. Bank, relating to the Company’s 5.75% Senior Notes due 2042, including form thereof. (Incorporated by reference to the Company’s Registration Statement on Form 8-A dated July 25, 2012.)
10.1	Master Sub-Management Agreement, dated as of June 13, 2014, between Equity Commonwealth Management LLC, a wholly owned subsidiary of the Company, and CBRE, Inc. (+) (Incorporated by reference to the Company's Current Report on Form 8-K filed June 17, 2014.)
10.2	Termination and Cooperation Agreement, dated September 30, 2014, by and among Equity Commonwealth, Reit Management & Research LLC and RMR Australia Asset Management Pty Limited. (+) (Incorporated by reference to the Company’s Current Report on Form 8-K filed October 1, 2014.)
10.3	Equity Commonwealth 2015 Equity Incentive Plan. (Incorporated by reference to the Company's Current Report on Form 8-K filed June 18, 2015.)
10.4	Amendment No. 1 to the Equity Commonwealth 2015 Omnibus Incentive Plan. (+) (Filed herewith.)
10.5	Form of Restricted Stock Agreement for Employees under Equity Commonwealth 2015 Equity Incentive Plan. (+) (Filed herewith.)
10.6	Form of Restricted Stock Unit Agreement for Employees under Equity Commonwealth 2015 Equity Incentive Plan. (+) (Filed herewith.)
10.7	Form of Restricted Stock Agreement for Chairman of the Board under Equity Commonwealth 2015 Equity Incentive Plan. (+) (Filed herewith.)
10.8	Form of Restricted Stock Unit Agreement for Chairman of the Board under Equity Commonwealth 2015 Equity Incentive Plan. (+) (Filed herewith.)
10.9	CommonWealth REIT 2012 Equity Compensation Plan, renamed as the Equity Commonwealth 2012 Equity Compensation Plan. (+) (Incorporated by reference to the Company's Current Report on Form 8-K filed May 11, 2012.)
10.10	Amendment No. 1 to CommonWealth REIT 2012 Equity Compensation Plan, renamed as the Equity Commonwealth 2012 Equity Compensation Plan, dated October 28, 2014. (+) (Incorporated by reference to the Registration Statement on Form S-8 filed October 28, 2014.)

49

Exhibit  Number	Description
10.11	Form of Restricted Share Agreement. (+) (Incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2013.)
10.12	Form of Restricted Share Agreement for Trustees under Equity Commonwealth 2012 Equity Compensation Plan. (+) (Incorporated by reference to the Company’s Current Report on Form 8-K filed October 31, 2014.)
10.13	Form of Restricted Share Agreement for Employees (Special Awards) under Equity Commonwealth 2012 Equity Compensation Plan. (+) (Incorporated by reference to the Company’s Current Report on Form 8-K filed October 31, 2014.)
10.14	Form of Restricted Share Unit Agreement for Employees (Special Awards) under Equity Commonwealth 2012 Equity Compensation Plan. (+) (Incorporated by reference to the Company’s Current Report on Form 8-K filed October 31, 2014.)
10.15	Zell Restricted Share Agreement under Equity Commonwealth 2012 Equity Compensation Plan. (+) (Incorporated by reference to the Company’s Current Report on Form 8-K filed October 31, 2014.)
10.16	Zell Restricted Share Unit Agreement under Equity Commonwealth 2012 Equity Compensation Plan. (+) (Incorporated by reference to the Company’s Current Report on Form 8-K filed October 31, 2014.)
10.17	Form of Indemnification Agreement. (+) (Incorporated by reference to the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.)
10.18	Summary of Trustee Compensation. (+) (Filed herewith.)
10.19	Credit Agreement, dated as of January 29, 2015, among Equity Commonwealth, Wells Fargo Bank, National Association, as administrative agent, and the other financial institutions or entities from time to time party thereto. (Incorporated by reference to the Company’s Current Report on Form 8-K filed February 3, 2015.)
10.20	Forbearance Agreement Regarding Term Loan Agreement, by and among the Company, Wells Fargo Bank, National Association, as Administrative Agent, and each of the other financial institutions party thereto, effective as of April 11, 2014. (Incorporated by reference to the Company's Current Report on Form 8-K filed April 14, 2014.)
10.21	Fourth Amendment to Term Loan Agreement and Waiver, dated as of June 6, 2014, among the Company, Wells Fargo Bank, National Association, as Administrative Agent, and each of the other financial institutions party thereto. (Incorporated by reference to the Company's Current Report on Form 8-K filed June 12, 2014.)
10.22	Stock Purchase Agreement, dated as of July 8, 2014, by and among the Company, Government Properties Income Trust and Reit Management & Research LLC. (Incorporated by reference to the Company’s Current Report on Form 8-K filed July 9, 2014.)
10.23	Letter Agreement, dated as of July 23, 2014, by and between the Company and Government Properties Income Trust. (Incorporated by reference to the Company’s Current Report on Form 8-K filed July 23, 2014.)
12.1	Computation of Ratio of Earnings to Fixed Charges. (Filed herewith.)
12.2	Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Distributions. (Filed herewith.)
21.1	Subsidiaries of the Company. (Filed herewith.)
23.1	Consent of Ernst & Young LLP. (Filed herewith.)
31.1	Rule 13a-14(a) Certification. (Filed herewith.)
31.2	Rule 13a-14(a) Certification. (Filed herewith.)

50

Exhibit  Number	Description
32.1	Section 1350 Certification. (Furnished herewith.)
101.1	The following materials from the Company’s Annual Report on Form 10-K for the year ended December 31, 2015, formatted in XBRL (eXtensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Consolidated Statements of Comprehensive Income (Loss), (iv) the Consolidated Statements of Shareholders' Equity, (v) the Consolidated Statements of Cash Flows and (vi) related notes to these financial statements, tagged as blocks of text and in detail. (Filed herewith.)

(+) Management contract or compensatory plan or arrangement.

51

Report of Independent Registered Public Accounting Firm

To the Trustees and Shareholders of Equity Commonwealth

We have audited the accompanying consolidated balance sheets of Equity Commonwealth (the "Company") as of December 31, 2015 and 2014, and the related consolidated statements of operations, comprehensive income (loss), shareholders' equity and cash flows for each of the three years in the period ended December 31, 2015. Our audits also included the financial statement schedules listed in the Index at Item 15(a). These financial statements and schedules are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements and schedules based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Equity Commonwealth at December 31, 2015 and 2014, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2015, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedules, when considered in relation to the basic financial statements taken as a whole, present fairly in all material respects the information set forth therein.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Equity Commonwealth's internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 18, 2016 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Chicago, Illinois

February 18, 2016

F-1

Report of Independent Registered Public Accounting Firm

To the Trustees and Shareholders of Equity Commonwealth

We have audited Equity Commonwealth's (the "Company") internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). Equity Commonwealth's management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management Report on Assessment of Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Equity Commonwealth maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the 2015 consolidated financial statements of Equity Commonwealth and our report dated February 18, 2016 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Chicago, Illinois

February 18, 2016

F-2

EQUITY COMMONWEALTH

CONSOLIDATED BALANCE SHEETS

(amounts in thousands, except share data)

	December 31,
	2015			2014
ASSETS
Real estate properties:
Land	$	389,410		$	714,238
Buildings and improvements	3,497,942			5,014,205
	3,887,352			5,728,443
Accumulated depreciation	(898,939		)	(1,030,445		)
	2,988,413			4,697,998
Acquired real estate leases, net	88,760			198,287
Cash and cash equivalents	1,802,729			364,516
Restricted cash	32,245			32,257
Rents receivable, net of allowance for doubtful accounts of $7,715 and $6,565, respectively	174,676			248,101
Other assets, net	157,549			220,480
Total assets	$	5,244,372		$	5,761,639
LIABILITIES AND SHAREHOLDERS’ EQUITY
Senior unsecured debt, net	$	1,460,592		$	1,598,416
Mortgage notes payable, net	249,732			609,249
Accounts payable and accrued expenses	123,587			162,204
Assumed real estate lease obligations, net	4,296			26,784
Rent collected in advance	27,340			31,359
Security deposits	10,338			14,044
Total liabilities	1,875,885			2,442,056
Commitments and contingencies
Shareholders’ equity:
Preferred shares of beneficial interest, $0.01 par value: 50,000,000 shares authorized;
Series D preferred shares; 6 1/2% cumulative convertible; 4,915,196 and 4,915,497 shares issued and outstanding, respectively, aggregate liquidation preference of $122,880 and $122,887, respectively	119,263			119,266
Series E preferred shares; 7 1/4% cumulative redeemable on or after May 15, 2016; 11,000,000 shares issued and outstanding, aggregate liquidation preference $275,000	265,391			265,391
Common shares of beneficial interest, $0.01 par value: 350,000,000 shares authorized; 126,349,914 and 129,607,279 shares issued and outstanding, respectively	1,263			1,296
Additional paid in capital	4,414,611			4,487,133
Cumulative net income	2,333,709			2,233,852
Cumulative other comprehensive loss	(3,687		)	(53,216		)
Cumulative common distributions	(3,111,868		)	(3,111,868		)
Cumulative preferred distributions	(650,195		)	(622,271		)
Total shareholders’ equity	3,368,487			3,319,583
Total liabilities and shareholders’ equity	$	5,244,372		$	5,761,639

See accompanying notes.

F-3

EQUITY COMMONWEALTH

CONSOLIDATED STATEMENTS OF OPERATIONS

(amounts in thousands, except per share data)

	December 31,
	2015			2014			2013
Revenues:
Rental income	$	570,382		$	691,699		$	763,262
Tenant reimbursements and other income	144,509			170,158			189,767
Total revenues	714,891			861,857			953,029
Expenses:
Operating expenses	324,948			387,982			410,045
Depreciation and amortization	194,001			227,532			234,402
General and administrative	57,457			113,155			80,504
Loss on asset impairment	17,162			185,067			124,253
Acquisition related costs	—			5			318
Total expenses	593,568			913,741			849,522
Operating income (loss)	121,323			(51,884		)	103,507
Interest and other income	5,989			1,561			1,229
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of $1,028, $(549), and $9, respectively)	(107,316		)	(143,230		)	(173,011		)
Gain (loss) on early extinguishment of debt	6,661			4,909			(60,052		)
Gain on sale of equity investment	—			171,561			66,293
Gain on issuance of shares by an equity investee	—			17,020			—
Foreign currency exchange loss	(8,857		)	—			—
Gain on sale of properties	84,421			—			1,596
Income (loss) from continuing operations before income taxes and equity in earnings of investees	102,221			(63		)	(60,438		)
Income tax expense	(2,364		)	(3,191		)	(2,634		)
Equity in earnings of investees	—			24,460			25,754
Income (loss) from continuing operations	99,857			21,206			(37,318		)
Discontinued operations:
Income from discontinued operations	—			8,389			6,393
Loss on asset impairment from discontinued operations	—			(2,238		)	(102,869		)
Loss on early extinguishment of debt from discontinued operations	—			(3,345		)	(1,011		)
Net loss on sale of properties from discontinued operations	—			—			(22,162		)
Net income (loss)	99,857			24,012			(156,967		)
Net income attributable to noncontrolling interest in consolidated subsidiary	—			—			(20,093		)
Net income (loss) attributable to Equity Commonwealth	99,857			24,012			(177,060		)
Preferred distributions	(27,924		)	(32,095		)	(44,604		)
Excess fair value of consideration over carrying value of preferred shares	—			(16,205		)	—
Net income (loss) attributable to Equity Commonwealth common shareholders	$	71,933		$	(24,288	)	$	(221,664	)
Amounts attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations	$	71,933		$	(27,094	)	$	(102,015	)
Income from discontinued operations	—			8,389			6,393
Loss on asset impairment from discontinued operations	—			(2,238		)	(102,869		)
Loss on early extinguishment of debt from discontinued operations	—			(3,345		)	(1,011		)
Net loss on sale of properties from discontinued operations	—			—			(22,162		)
Net income (loss)	$	71,933		$	(24,288	)	$	(221,664	)
Weighted average common shares outstanding — basic	128,621			125,163			112,378
Weighted average common shares outstanding — diluted	129,437			125,163			112,378
Basic earnings per common share attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations	$	0.56		$	(0.21	)	$	(0.91	)
Income (loss) from discontinued operations	$	—		$	0.02		$	(1.06	)
Net income (loss)	$	0.56		$	(0.19	)	$	(1.97	)
Diluted earnings per common share attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations	$	0.56		$	(0.21	)	$	(0.91	)
Income (loss) from discontinued operations	$	—		$	0.02		$	(1.06	)
Net income (loss)	$	0.56		$	(0.19	)	$	(1.97	)

See accompanying notes.

F-4

EQUITY COMMONWEALTH

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(amounts in thousands)

	Year Ended December 31,
	2015		2014			2013
Net income (loss)	$	99,857	$	24,012		$	(156,967	)
Other comprehensive income (loss), net of tax:
Unrealized gain on derivative instruments and other assets	612		7,407			4,918
Foreign currency translation adjustments	48,917		(22,270		)	(43,718		)
Equity in unrealized loss of an investee	—		(22		)	(132		)
Total comprehensive income (loss)	149,386		9,127			(195,899		)
Less: comprehensive income attributable to noncontrolling interest in consolidated subsidiary	—		—			(20,057		)
Comprehensive income (loss) attributable to Equity Commonwealth	$	149,386	$	9,127		$	(215,956	)

See accompanying notes.

F-5

EQUITY COMMONWEALTH

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY

(amounts in thousands, except share data)

	Equity Commonwealth Shareholders
	Preferred Shares											Common Shares
	Series D					Series E
	Number of Shares		Preferred Shares			Number of Shares	Preferred Shares		Cumulative Preferred Distributions			Number of Shares	Common Shares		Cumulative Common Distributions			Additional Paid in Capital		Cumulative Net Income			Cumulative Other Comprehensive Income (Loss)			Noncontrolling Interest in Consolidated Subsidiary			Total
Balance at December 31, 2012	15,180,000		$	368,270		11,000,000	$	265,391	$	(529,367	)	83,804,068	$	838	$	(2,972,569	)	$	3,585,400	$	2,386,900		$	565		$	396,040		$	3,501,468
Comprehensive income (loss):
Net (loss) income	—		—			—	—		—			—	—		—			—		(177,060		)	—			20,093			(156,967		)
Unrealized loss on derivative instrument	—		—			—	—		—			—	—		—			—		—			4,918			—			4,918
Foreign currency translation adjustments	—		—			—	—		—			—	—		—			—		—			(43,718		)	—			(43,718		)
Equity in unrealized income of an investee	—		—			—	—		—			—	—		—			—		—			(96		)	(36		)	(132		)
Total comprehensive loss																													(195,899		)
Issuance of shares, net	—		—			—	—		—			34,500,000	345		—			626,506		—			—			(42		)	626,809
Share grants	—		—			—	—		—			82,850	1		—			1,536		—			—			284			1,821
Adjustments to noncontrolling interest resulting from changes in ownership of a subsidiary	—		—			—	—		—			—	—		—			32		—			—			(32		)	—
Distributions	—		—			—	—		(44,604		)	—	—		(109,702		)	—		—			—			(14,863		)	(169,169		)
Deconsolidation of a subsidiary	—		—			—	—		—			—	—		—			—		—			—			(401,444		)	(401,444		)
Balance at December 31, 2013	15,180,000		368,270			11,000,000	265,391		(573,971		)	118,386,918	1,184		(3,082,271		)	4,213,474		2,209,840			(38,331		)	—			3,363,586
Comprehensive income (loss):
Net income	—		—			—	—		—			—	—		—			—		24,012			—			—			24,012
Unrealized gain on derivative instruments	—		—			—	—		—			—	—		—			—		—			7,407			—			7,407
Foreign currency translation adjustments	—		—			—	—		—			—	—		—			—		—			(22,270		)	—			(22,270		)
Equity in unrealized loss of an investee	—		—			—	—		—			—	—		—			—		—			(22		)	—			(22		)
Total comprehensive income																													9,127
Issuance of shares, net	—		—			—	—		—			90,135	—		—			2,402		—			—			—			2,402
Redemption of shares	(10,264,503	)	(249,004		)	—	—		(16,205		)	10,412,499	104		—			265,105		—			—			—			—
Share grants	—		—			—	—		—			717,727	8		—			6,152		—			—			—			6,160
Distributions	—		—			—	—		(32,095		)	—	—		(29,597		)	—		—			—			—			(61,692		)
Balance at December 31, 2014	4,915,497		119,266			11,000,000	265,391		(622,271		)	129,607,279	1,296		(3,111,868		)	4,487,133		2,233,852			(53,216		)	$	—		3,319,583

See accompanying notes.

F-6

EQUITY COMMONWEALTH

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Continued)

(amounts in thousands, except share data)

	Equity Commonwealth Shareholders
	Preferred Shares											Common Shares
	Series D					Series E
	Number of Shares		Preferred Shares			Number of Shares	Preferred Shares		Cumulative Preferred Distributions			Number of Shares		Common Shares			Cumulative Common Distributions			Additional Paid in Capital			Cumulative Net Income		Cumulative Other Comprehensive Income (Loss)			Noncontrolling Interest in Consolidated Subsidiary		Total
Comprehensive income:
Net income	—		—			—	—		—			—		—			—			—			99,857		—			—		99,857
Unrealized gain on derivative instruments	—		—			—	—		—			—		—			—			—			—		612			—		612
Foreign currency translation adjustments	—		—			—	—		—			—		—			—			—			—		48,917			—		48,917
Total comprehensive income																														149,386
Issuance of shares, net	—		—			—	—		—			—		—			—			—			—		—			—		—
Purchase of shares	—		—			—	—		—			(3,410,300	)	(35		)	—			(87,948		)	—		—			—		(87,983		)
Redemption of shares	(301	)	(3		)	—	—		—			144		—			—			3			—		—			—		—
Share grants	—		—			—	—		—			152,791		2			—			15,423			—		—			—		15,425
Distributions	—		—			—	—		(27,924		)	—		—			—			—			—		—			—		(27,924		)
Balance at December 31, 2015	4,915,196		$	119,263		11,000,000	$	265,391	$	(650,195	)	126,349,914		$	1,263		$	(3,111,868	)	$	4,414,611		$	2,333,709	$	(3,687	)	$	—	$	3,368,487

See accompanying notes.

F-7

EQUITY COMMONWEALTH

CONSOLIDATED STATEMENTS OF CASH FLOWS

(amounts in thousands)

	Year Ended December 31,
	2015			2014			2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$	99,857		$	24,012		$	(156,967	)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation	145,888			166,076			178,353
Net amortization of debt discounts, premiums and deferred financing fees	1,028			(552		)	81
Straight line rental income	(5,255		)	(12,759		)	(31,229		)
Amortization of acquired real estate leases	34,277			51,140			59,274
Other amortization	21,309			20,931			18,850
Share-based compensation	15,425			5,733			—
Loss on asset impairment	17,162			187,305			227,122
(Gain) loss on early extinguishment of debt	(6,661		)	(1,564		)	61,063
Equity in earnings of investees	—			(24,460		)	(25,754		)
Gain on sale of equity investments	—			(171,561		)	(66,293		)
Gain on issuance of shares by an equity investee	—			(17,020		)	—
Distributions of earnings from investees	—			20,680			23,911
Foreign currency exchange loss	8,857			—			—
Net (gain) loss on sale of properties	(84,421		)	—			20,566
Other non-cash expenses	—			2,402			—
Change in assets and liabilities:
Restricted cash	(6,570		)	3,486			(1,832		)
Rents receivable and other assets	(47,472		)	(30,785		)	(57,039		)
Accounts payable and accrued expenses	(4,643		)	10,389			(14,333		)
Rent collected in advance	(8,462		)	(229		)	125
Security deposits	1,225			433			611
Due to related persons	—			(9,277		)	(1,858		)
Cash provided by operating activities	181,544			224,380			234,651
CASH FLOWS FROM INVESTING ACTIVITIES:
Real estate acquisitions	—			—			(154,370		)
Real estate improvements	(70,633		)	(99,651		)	(114,451		)
Principal payments received from direct financing lease	7,352			7,311			6,970
Principal payments received from real estate mortgages receivable	—			—			1,000
Proceeds from sale of properties, net	1,691,831			185,299			224,976
Purchase of securities	—			(23,988		)	—
Proceeds from sale of securities	27,068			—			—
Proceeds from sale of equity investments, net	—			710,492			239,576
Distributions in excess of earnings from investees	—			—			168
Increase in restricted cash	(6,725		)	(8,225		)	(9,102		)
Deconsolidation of a subsidiary	—			—			(12,286		)
Cash provided by investing activities	1,648,893			771,238			182,481
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common shares, net	—			—			626,809
Purchase and retirement of common shares	(87,983		)	—			—
Repurchase and retirement of outstanding debt securities	—			—			(728,021		)
Proceeds from borrowings	—			—			1,036,000
Payments on borrowings	(259,672		)	(785,316		)	(1,065,432		)
Deferred financing fees	(7,143		)	—			(1,204		)
Distributions to common shareholders	—			(29,597		)	(109,702		)
Distributions to preferred shareholders	(27,924		)	(32,095		)	(44,604		)
Distributions to noncontrolling interest in consolidated subsidiary	—			—			(14,863		)
Cash used in financing activities	(382,722		)	(847,008		)	(301,017		)
Effect of exchange rate changes on cash	(9,502		)	(1,126		)	(1,302		)
Increase in cash and cash equivalents	1,438,213			147,484			114,813
Cash and cash equivalents at beginning of period	364,516			217,032			102,219
Cash and cash equivalents at end of period	$	1,802,729		$	364,516		$	217,032

See accompanying notes.

F-8

EQUITY COMMONWEALTH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)

(amounts in thousands)

	Year Ended December 31,
	2015			2014		2013
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	$	111,324		$	146,265	$	192,010
Taxes paid	6,028			2,732		1,303
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Investment in real estate mortgage receivable	$	—		$	—	$	(7,688	)
Net assets transferred to Select Income REIT	—			—		492,736
(Decrease) increase in capital expenditures recorded as liabilities	(13,528		)	7,690		(8,475		)
Mortgage note payable and interest payable transferred in consensual foreclosure	43,255			—		—

See accompanying notes.

F-9

EQUITY COMMONWEALTH

 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 1.  Organization

Equity Commonwealth is a real estate investment trust, or REIT, formed in 1986 under the laws of the State of Maryland. Our primary business is the ownership and operation of real estate, primarily office buildings, throughout the United States. All number of properties, number of buildings and square feet are unaudited.

At December 31, 2015, our portfolio included the following (square feet in thousands):

	Number of Properties	Number of Buildings	Square Feet
Total portfolio	65	127	23,952

From July 2, 2013 through July 9, 2014 we also owned 22,000,000 common shares of Select Income REIT and its consolidated subsidiaries (SIR), and accounted for our investment in SIR under the equity method. On July 9, 2014, we sold our entire stake of 22,000,000 common shares of SIR. SIR was a 100% owned subsidiary of ours until March 12, 2012, on which date SIR completed an initial public offering of 9,200,000 of its common shares (SIR IPO), and became a publicly owned company with shares listed on the New York Stock Exchange (NYSE). On July 2, 2013, SIR issued and sold to the public 10,500,000 of its common shares. Prior to the completion of this offering, our 22,000,000 common shares of SIR represented approximately 56.0% of SIR's outstanding common shares, and SIR was one of our consolidated subsidiaries. Following the completion of this offering, our 22,000,000 common shares of SIR represented approximately 44.2% of SIR's outstanding common shares, and SIR ceased to be our consolidated subsidiary. See Notes 7 and 19 for additional information regarding SIR.

Until March 15, 2013, we also owned 9,950,000, or approximately 18.2%, of the common shares of Government Properties Income Trust (GOV). GOV was our wholly owned subsidiary until its initial public offering in June 2009, when it became a publicly owned company with shares listed on the NYSE. On March 15, 2013, we sold all shares that we owned of GOV. See Notes 7 and 19 for additional information regarding GOV.

Note 2.  Summary of Significant Accounting Policies

Basis of Presentation.    The consolidated financial statements include our investments in 100% owned subsidiaries and majority owned subsidiaries that are controlled by us. References to we, us, our and the Company, refer to Equity Commonwealth and its consolidated subsidiaries as of December 31, 2015, unless the context indicates otherwise. The portion of a consolidated subsidiary that is not controlled by us, or the noncontrolling interest, is presented as a separate component of equity in our consolidated balance sheets. In addition, net income attributable to the noncontrolling interest is presented separately in our consolidated statements of operations. All intercompany transactions and balances have been eliminated.

We account for our investments in 50% or less owned companies, including our investments in SIR (beginning on July 2, 2013 when SIR ceased to be our consolidated subsidiary through the sale date on July 9, 2014), GOV (until March 15, 2013, when we sold all of our GOV common shares) and Affiliates Insurance Company, or AIC (until May 9, 2014, when we sold all of our AIC shares), over which we can exercise influence, but do not control, using the equity method of accounting. We used the income statement method to account for issuance of common shares of beneficial interest by SIR and GOV, and shares of common stock by AIC. Under this method, gains and losses reflecting changes in the value of our investments at the date of issuance of additional common shares by SIR and GOV, or common stock by AIC, are recognized in our income statement.

Real Estate Properties.    We record real estate properties at cost. We depreciate real estate investments on a straight line basis over estimated useful lives of up to 40 years for buildings and improvements, and up to 12 years for personal property.

Each time we enter into a new lease, or materially modify an existing lease, we evaluate its classification as either a capital or operating lease. The classification of a lease as capital or operating affects the carrying value of a property, as well as our recognition of rental payments as revenue. These evaluations require us to make estimates of, among other things, the remaining useful life and fair market value of a leased property, appropriate discount rates and future cash flows.

We allocate the consideration paid for our properties among land, buildings and improvements and, for properties that qualify as acquired businesses under the Business Combinations Topic of the FASB Accounting Standards Codification™, or the Codification, to identified intangible assets and liabilities, consisting of the value of above market and below market leases, the value of acquired in place leases and the value of tenant relationships. Purchase price allocations and the determination of useful lives are based on our estimates and, under some circumstances, studies from independent real estate appraisal firms to

F-10

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

provide market information and evaluations that are relevant to our purchase price allocations and determinations of useful lives; however, we are ultimately responsible for the purchase price allocations and determination of useful lives.

We allocate the consideration to land, buildings and improvements based on a determination of the fair values of these assets assuming the property is vacant. We determine the fair value of a property using methods that we believe are similar to those used by independent appraisers. Purchase price allocations to above market and below market leases are based on the estimated present value (using an interest rate which reflects our assessment of the risks associated with the leases acquired) of the difference between (1) the contractual amounts to be paid pursuant to the acquired in place leases and (2) our estimate of fair market lease rates for the corresponding leases, measured over a period equal to the remaining non-cancelable terms of the respective leases. Purchase price allocations to acquired in place leases and tenant relationships are determined as the excess of (1) the purchase price paid for a property after adjusting existing in place leases to estimated market rental rates over (2) the estimated fair value of the property as if vacant. We aggregate this value between acquired in place lease values and tenant relationships based on our evaluation of the specific characteristics of each tenant's lease; however, the value of tenant relationships has not been separated from acquired in place lease value for our properties because we believe such value and related amortization expense is immaterial for acquisitions reflected in our historical financial statements. We consider certain factors in performing these analyses including estimates of carrying costs during the expected lease up periods, including real estate taxes, insurance and other operating income and expenses and costs to execute similar leases in current market conditions, such as leasing commissions, legal and other related costs. If we believe the value of tenant relationships is material in the future, those amounts will be separately allocated and amortized over the estimated lives of the relationships. We recognize the excess, if any, of the consideration paid over amounts allocated to land, buildings and improvements and identified intangible assets and liabilities as goodwill and we recognize gains if amounts allocated exceed the consideration paid.

We amortize capitalized above market lease values (presented in our consolidated balance sheets as acquired real estate leases) as a reduction to rental income over the remaining terms of the respective leases. We amortize capitalized below market lease values (presented in our consolidated balance sheets as assumed real estate lease obligations) as an increase to rental income over the remaining terms of the respective leases. We amortize the value of acquired in place leases exclusive of the value of above market and below market acquired in place leases to expense over the remaining terms of the respective leases. If a lease is terminated prior to its stated expiration, the unamortized lease intangibles relating to that lease is written off.

We review our properties for impairment quarterly, or whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. Impairment indicators may include declining tenant occupancy, lack of progress releasing vacant space, tenant bankruptcies, low long term prospects for improvement in property performance, weak or declining tenant profitability, cash flow or liquidity, our decision to dispose of an asset before the end of its estimated useful life. When indicators of potential impairment are present that suggest that the carrying amounts of real estate assets may not be recoverable, we assess the recoverability of these assets by determining whether the respective carrying values will be recovered through the estimated undiscounted future operating cash flows expected from the use of the assets and their eventual disposition. The determination of undiscounted cash flow includes consideration of many factors including income to be earned from the investment, holding costs (exclusive of interest), estimated selling prices, and prevailing economic and market conditions. In the event that such expected undiscounted future cash flows do not exceed the carrying values, we estimate the fair value of the assets and record an impairment charge equal to the amount by which the carrying value exceeds the estimated fair value. Estimated fair values are calculated based on the following information, (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of future cash flows. During the years ended December 31, 2015 and 2014, we recorded a loss on asset impairment in continuing operations totaling $17.2 million and $185.1 million, respectively, to reduce the carrying value of properties to their estimated fair values (see Note 16).

When we classify properties as held for sale, we discontinue the recording of depreciation expense and estimate their fair value less costs to sell. If we determine that the carrying value for these properties exceed their estimated fair value less costs to sell, we record a loss on asset impairment. During the year ended December 31, 2013, we recorded a loss on asset impairment of $79.8 million in discontinued operations and a loss on asset impairment of $124.3 million in continuing operations to reduce the carrying value of 39 properties (93 buildings) classified as held for sale to their estimated fair value less costs to sell. In addition, we recorded losses on asset impairment for properties sold during 2013 totaling $23.1 million.

Certain of our real estate assets contain hazardous substances, including asbestos. We believe any asbestos in our buildings is contained in accordance with current regulations, and we have no current plans to remove any such asbestos. If we remove the asbestos or renovate or demolish these properties, certain environmental regulations govern the manner in which the asbestos must be handled and removed. We do not believe that there are other environmental conditions at any of our properties

F-11

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

that have a material adverse effect on us. However, no assurances can be given that such conditions are not present in our properties or that other costs we incur to remediate contamination will not have a material adverse effect on our business or financial condition. As of December 31, 2015, we did not have any accrued environmental remediation costs. As of December 31, 2014, accrued environmental remediation costs by us totaling $0.5 million were included in accounts payable and accrued expenses in our consolidated balance sheets.

Cash and Cash Equivalents.    Our cash and cash equivalents consists of cash maintained in time deposits, depository accounts and money market accounts.  From time-to-time we may also invest in various U.S. government securities.  We continually monitor the credit ratings of the financial institutions holding our deposits to minimize our exposure to credit risk.  Throughout the year, we have cash balances in excess of federally insured limits deposited with various financial institutions. We do not believe we are exposed to any significant credit risk on cash and cash equivalents.

Restricted Cash.    Restricted cash consists of amounts escrowed for future real estate taxes, insurance, leasing costs, capital expenditures and debt service, as required by some of our mortgage debts, as well as security deposits paid to us by some of our tenants.

Other Assets, Net.    Other assets consist principally of deferred financing fees, deferred leasing costs, capitalized lease incentives and prepaid property operating expenses. Deferred financing fees include issuance costs related to borrowings and are capitalized and amortized over the terms of the respective loans. Deferred leasing costs include brokerage, legal and other fees associated with the successful negotiation of leases and are amortized on a straight line basis over the terms of the respective leases. Capitalized lease incentives are amortized on a straight line basis against rental income over the terms of the respective leases.

Accounting Policy for Derivative Instruments.    The Derivatives and Hedging Topic of the Codification requires companies to recognize all their derivative instruments as either assets or liabilities in the statement of financial position at fair value. The accounting for changes in the fair value of a derivative instrument depends on whether such instrument has been designated and qualifies as part of a hedging relationship and, further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, we must designate the hedging instrument, based upon the exposure being hedged, as a fair value hedge, cash flow hedge or a hedge of a net investment in a foreign operation. In December 2009, we entered into interest rate swap agreements that qualify as cash flow hedges.

We are exposed to certain risks relating to our ongoing business operations. The primary risk managed by using derivative instruments is interest rate risk. Interest rate swaps are entered into to manage interest rate risk associated with our floating rate borrowings. We designate interest rate swaps as cash flow hedges of floating rate borrowings.

Revenue Recognition.    Rental income from operating leases, which includes rent concessions (including free rent and other lease incentives) and scheduled increases in rental rates during the lease term, is recognized on a straight line basis over the life of the lease agreements. We defer the recognition of contingent rental income, such as percentage rents, until the specific targets that trigger the contingent rental income are achieved. Tenant reimbursements and other income includes property level operating expenses reimbursed by our tenants, as well as other incidental revenues, which are recorded as expenses are incurred.

Allowance for Doubtful Accounts.    We maintain an allowance for doubtful accounts for estimated losses resulting from the inability or unwillingness of certain tenants to make payments required under their leases. The computation of the allowance is based on the tenants' payment histories and current credit profiles, as well as other considerations.

Share-Based Compensation. All share-based compensation is measured at fair value on the grant date or date of modification, as applicable, and recognized in earnings over the requisite service period. Depending upon the settlement terms of the awards, all or a portion of the fair value of share-based awards may be presented as a liability or as equity in the consolidated balance sheets.

Earnings Per Common Share.    Earnings per common share, or EPS, is computed using the weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if our series D convertible preferred shares or our restricted share units (RSUs) were converted into our common shares, which could result in a lower EPS amount. The effect of our series D convertible preferred shares on income from continuing operations and net income attributable to common shareholders is anti-dilutive for all periods presented.

Reclassifications.    Reclassifications have been made to the prior years' financial statements and notes to conform to the current year's presentation.

F-12

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Income Taxes.    We are a REIT under the Internal Revenue Code of 1986, as amended, and are generally not subject to federal and state income taxes provided we distribute our taxable income to our shareholders and meet other requirements for qualifying as a real estate investment trust. However, we are subject to certain state and local taxes without regard to our REIT status.

The Income Taxes Topic of the Codification prescribes how we should recognize, measure and present in our financial statements uncertain tax positions that have been taken or are expected to be taken in a tax return. Deferred tax assets are recognized to the extent that it is "more likely than not" that a particular tax position will be sustained upon examination or audit. To the extent the "more likely than not" standard has been satisfied, the benefit associated with a tax position is measured as the largest amount that has a greater than 50% likelihood of being realized upon settlement. We classify interest and penalties related to uncertain tax positions, if any, in our financial statements as a component of general and administrative expense.

Use of Estimates.    Preparation of these financial statements in conformity with U.S. generally accepted accounting principles, or GAAP, requires us to make estimates and assumptions that may affect the amounts reported in these financial statements and related notes. The actual results could differ from these estimates.

Foreign Operations.    During the year ended December 31, 2015, we sold our Australian properties (Note 4) and as of December 31, 2015, we do not have any foreign operations. The U.S. dollar was the functional currency for our consolidated subsidiaries operating in the United States prior to the sale of the Australian portfolio. The functional currency for our consolidated subsidiaries in countries other than the United States was the principal currency in which the entity's assets, liabilities, income and expenses were denominated. The functional currency of our consolidated subsidiary that operated in Australia was the Australian dollar. We translated our Australian subsidiary's financial statements into U.S. dollars when we consolidated that subsidiary's financial statements on a quarterly basis. Generally, we translated assets and liabilities at the exchange rate in effect as of the balance sheet date. The resulting translation adjustments were included in cumulative other comprehensive loss in our consolidated balance sheets. We translated income statement accounts using the average exchange rate for the period and income statement accounts that include significant non-recurring transactions at the rate in effect as of the date of the transaction. We were subject to foreign currency risk due to potential fluctuations in exchange rates between Australian and U.S. currencies.

Subsequent to the disposition of the Australian properties, we recognized a foreign currency exchange loss of $8.9 million in our consolidated statement of operations for the year ended December 31, 2015. The foreign currency exchange loss for the year ended December 31, 2015 relates to the change in foreign currency rates resulting in losses on cash proceeds from the Australian portfolio disposition maintained in an Australian bank account prior to the transfer of cash from our Australian subsidiary to our U.S bank accounts. As of December 31, 2015, we did not have any cumulative foreign currency translation adjustments as the cumulative foreign currency translation adjustment of $63.2 million was reclassified from other comprehensive loss to earnings upon disposition of the Australian properties. As of December 31, 2014, cumulative foreign currency translation adjustments were $(48.9) million.

New Accounting Pronouncements. In April 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, or ASU 2014-08.  ASU 2014-08 changes the criteria for reporting a discontinued operation.  Under the new pronouncement, a disposal of a part of an organization that has a major effect on its operations and financial results is a discontinued operation.  We adopted ASU 2014-08 on January 1, 2015, and determined that our 2015 dispositions do not individually represent a strategic shift, as defined by the standard, that has or will have a major effect on our operations and financial results. As a result, the 2015 dispositions have not been presented as discontinued operations in the 2015 statements of operations.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which provides guidance for revenue recognition. This update is effective for interim and annual reporting periods beginning after December 15, 2017.  We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs. This standard amends existing guidance to require the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of as a deferred charge. It is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. We do not expect that the adoption of this standard will have a material impact on our consolidated financial statements.

F-13

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Note 3.  Board of Trustees

On March 18, 2014, Related Fund Management, LLC (Related) and Corvex Management LP (Corvex) together, (Related/Corvex), delivered written consents which they represented were from a sufficient number of holders of our outstanding common shares to remove all of our then Trustees (former Trustees) and any other person or persons elected or appointed to our Board of Trustees prior to the effective time of the Related/Corvex removal proposal. After inspection, our then Board of Trustees determined that holders of more than two-thirds of our outstanding common shares as of the February 18, 2014, record date consented to the Related/Corvex proposal, reaching the threshold required to remove all of our then Trustees and any other person or persons appointed as a Trustee prior to the effective time of the Related/Corvex removal proposal. Accordingly, on March 25, 2014, all of our former Trustees certified their removal as Trustees of EQC.

On May 23, 2014, at a special meeting of our shareholders (Special Meeting), the following seven individuals were elected to serve on our Board of Trustees: Sam Zell, who serves as the Chairman of the new Board of Trustees, James S. Corl, Edward A. Glickman, David A. Helfand, Peter Linneman, James L. Lozier, Jr. and Kenneth Shea.  Each of the foregoing individuals was nominated to serve on the new Board of Trustees by Related/Corvex. On July 31, 2014, our shareholders re-elected the seven individuals listed above and elected Martin L. Edelman, Mary Jane Robertson, Gerald A. Spector and James A. Star to serve on our Board of Trustees, bringing our total number of Trustees to eleven (new Board of Trustees). At the 2015 annual meeting of shareholders held on June 16, 2015, our shareholders re-elected each of our eleven Trustees to serve on our Board of Trustees for the 2015-2016 term.

Note 4.  Real Estate Properties

The information presented in this Note 4 excludes information related to SIR and its consolidated subsidiaries, unless the context indicates otherwise.

We did not make any acquisitions during the years ended December 31, 2015, or 2014.

During the years ended December 31, 2015, 2014, and 2013, we made improvements, excluding tenant-funded improvements, to our properties totaling $75.7 million, $91.6 million and $122.9 million, respectively. Improvements made during the year ended December 31, 2013, include improvements made by SIR to its properties for the period that SIR was our consolidated subsidiary until July 2, 2013.

We committed $156.4 million for expenditures related to 4,900,000 square feet of leases executed during 2015. Committed but unspent tenant related obligations, including leasing commissions and tenant improvements, based on existing leases as of December 31, 2015, were $118.9 million.

Properties Held For Sale:

We classify all properties that meet the criteria outlined in the Property, Plant and Equipment Topic of the FASB Accounting Standards Codification (Codification) as held for sale on our consolidated balance sheets.  During March 2014, the former management team ceased to actively market 31 properties (67 buildings) with a combined 5,641,450 square feet that we had previously classified as held for sale as of December 31, 2013.  These properties were not under agreement for sale when our former Trustees were removed in March 2014.  These properties were reclassified to properties held and used in operations because they no longer met the requirements under GAAP for classification as held for sale.  Operating results for these properties were reclassified from discontinued operations to continuing operations for all periods presented herein.  In connection with this reclassification, we reversed previously recorded impairment losses totaling $4.8 million, which included the elimination of estimated costs to sell. As of December 31, 2015, and 2014, we had no properties classified as held for sale.

F-14

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Property Dispositions:

During the year ended December 31, 2015, we disposed of the following properties (dollars in thousands):

Asset	Date Disposed	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
Properties
11350 North Meridian Street	January 2015	1	1	72,264	$	4,200	$	766
333 Laurel Oak Drive(1)	March 2015	—	1	27,164	2,450		251
1921 E. Alton Avenue	March 2015	1	1	67,846	14,533		4,851
46 Inverness Center Parkway	April 2015	—	—	—	2,000		1,857
225 Water Street(2)	May 2015	1	1	318,997	—		—
Sorrento Valley Business Park	June 2015	1	4	105,003	23,500		11,896
Illinois Center	August 2015	1	2	2,090,162	376,000		26,956
16th and Race Street	August 2015	1	1	608,625	43,000		7,922
185 Asylum Street	September 2015	1	1	868,395	113,250		17,619
One South Church Avenue	October 2015	1	1	240,811	32,000		4,282
775 Ridge Lake Boulevard	October 2015	1	1	120,678	16,300		(360		)
One Park Square	October 2015	1	6	259,737	34,300		9,512
Arizona Center	December 2015	1	4	1,070,724	126,000		22,838
4 South 84th Avenue	December 2015	1	1	236,007	18,000		8,393
Portfolio of properties
7450 Campus Drive	May 2015	1	1	77,411
129 Worthington Ridge Road	May 2015	1	1	227,500
599 Research Parkway	May 2015	1	1	48,249
181 Marsh Hill Road	May 2015	1	1	162,036
101 Barnes Road	May 2015	1	1	45,755
15 Sterling Drive	May 2015	1	1	173,015
35 Thorpe Avenue	May 2015	1	1	79,862
50 Barnes Industrial Road North	May 2015	1	1	154,255
5-9 Barnes Industrial Road	May 2015	1	1	38,006
860 North Main Street	May 2015	1	1	31,165
One Barnes Industrial Road South	May 2015	1	1	30,170
Village Lane	May 2015	1	2	58,185
100 Northfield Drive	May 2015	1	1	116,986
905 Meridian Lake Drive	May 2015	1	1	74,652
1717 Deerfield Road	May 2015	1	1	141,186
1955 West Field Court	May 2015	1	1	59,130
5015 S. Water Circle	May 2015	1	1	113,524
Adams Place	May 2015	1	2	230,259
Cabot Business Park	May 2015	1	2	252,755
2300 Crown Colony Drive	May 2015	1	1	45,974
Myles Standish Industrial Park	May 2015	1	2	74,800
340 Thompson Road	May 2015	1	1	25,000
100 South Charles Street	May 2015	1	1	159,616
6710 Oxon Hill	May 2015	1	1	118,336
8800 Queen Avenue South	May 2015	1	1	280,822

F-15

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Asset	Date Disposed	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
9800 Sherlard Parkway	May 2015	1	1	46,765
Rosedale Corporate Plaza	May 2015	1	3	149,116
1000 Shelard Parkway	May 2015	1	1	62,499
525 Park Street	May 2015	1	1	75,636
1900 Meyer Drury Drive	May 2015	1	1	65,225
131-165 West Ninth Street	May 2015	1	1	75,517
7-9 Vreeland Road	May 2015	1	1	155,891
5 Paragon Drive	May 2015	1	1	119,089
1000 Voorhees Drive and 400 Laurel Oak Drive(1)	May 2015	1	2	125,415
1601 Veterans Highway	May 2015	1	1	63,608
Two Corporate Center Drive	May 2015	1	1	291,230
11311 Cornell Park Drive	May 2015	1	1	93,413
5300 Kings Island Drive	May 2015	1	1	159,421
3 Crown Point Court	May 2015	1	1	73,987
515 Pennsylvania Avenue	May 2015	1	1	82,000
443 Gulph Road	May 2015	1	1	21,000
4350 Northern Pike	May 2015	1	1	503,885
Thunderbolt Place	May 2015	1	2	100,505
6160 Kempsville Circle	May 2015	1	1	129,565
448 Viking Drive	May 2015	1	1	75,374
Portfolio of small office and industrial assets		45	53	5,287,790	$	376,000	$	(8,160	)
2501 20th Place South	June 2015	1	1	125,722
420 20th Street North	June 2015	1	1	514,893
Inverness Center	June 2015	1	4	475,882
701 Poydras Street	June 2015	1	1	1,256,971
300 North Greene Street	June 2015	1	1	324,305
1320 Main Street	June 2015	1	1	334,075
AL, LA, NC, SC office portfolio		6	9	3,031,848	$	417,450	$	41,596
12655 Olive Boulevard	June 2015	1	1	98,588
1285 Fern Ridge Parkway	June 2015	1	1	66,510
St. Louis portfolio(3)		2	2	165,098	$	14,300	$	(2,349	)
310-314 Invermay Road(4)	April 2015	1	1	47,480
253-293 George Town Road(4)	April 2015	1	1	143,914
7 Modal Crescent	June 2015	1	1	164,160
71-93 Whiteside Road	June 2015	1	1	303,488
9-13 Titanium Court	June 2015	1	1	69,664
16 Rodborough Road	June 2015	1	1	90,525
22 Rodborough Road	June 2015	1	1	43,427
127-161 Cherry Lane	June 2015	1	1	278,570
310-320 Pitt Street	June 2015	1	1	313,865

F-16

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Asset	Date Disposed	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
44-46 Mandarin Street	June 2015	1	1	226,718
19 Leadership Way	June 2015	1	1	76,714
Australia portfolio(5)		11	11	1,758,525	$	232,955	$	(47,872	)
Widewaters Parkway	August 2015	1	8	514,241
5062 Brittonfield Parkway	August 2015	1	1	40,162
Woodcliff Drive	August 2015	1	6	516,760
Interstate Place	August 2015	1	2	61,399
1000 Pittsford - Victor Road	August 2015	1	1	73,358
1200 Pittsford - Victor Road	August 2015	1	1	18,900
Corporate Crossing	August 2015	1	5	216,126
Canal View Boulevard	August 2015	1	3	118,375
14 Classic Street	August 2015	1	1	37,084
110 W Fayette Street	August 2015	1	1	304,906
251 Salina Meadows Parkway	August 2015	1	1	65,617
Upstate New York portfolio(3)		11	30	1,966,928	$	104,625	$	(12,518	)
9040 Roswell Road	October 2015	1	1	178,941
The Exchange	October 2015	1	2	187,632
3920 Arkwright Road	October 2015	1	1	196,156
1775 West Oak Commons Court	October 2015	1	1	79,854
Georgia portfolio(3)		4	5	642,583	$	48,550	$	(3,059	)
		91	135	18,939,185	$	1,999,413	$	84,421

(1) This property contains three buildings. We sold one building in March 2015 and two buildings in May 2015.

(2) Title to this property was transferred to the lender pursuant to a consensual foreclosure in full satisfaction of the mortgage debt with a principal balance of $40.1 million, resulting in a gain on early extinguishment of debt of $17.3 million for the year ended December 31, 2015. See Note 9 for additional information.

(3) Prior to the disposition of these properties, we recorded a total impairment charge of $17.2 million during the year ended December 31, 2015, based upon updated market information in accordance with our impairment analysis procedures.

(4) These properties were sold in a separate transaction to a different buyer than other Australian properties.

(5) The loss on sale includes a $63.2 million cumulative foreign currency translation adjustment reclassified from cumulative other comprehensive loss due to the disposition of the Australian portfolio.

F-17

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

During the years ended December 31, 2014 and 2013, we sold the following properties (dollars in thousands):

Date Sold	Number of Properties	Number of Buildings	Square Footage	Sales Price		Gain (Loss) on Sale
Sales of properties resulting in gains and losses
December 2013	3	40	1,670,104	$	89,000	$	(25,521	)
June 2013(6)	—	—	—	2,551		1,765
June 2013	1	1	30,105	1,600		317
March 2013(6)	—	—	—	1,806		1,596
January 2013(7)	3	18	1,060,026	10,250		1,277
	7	59	2,760,235	$	105,207	$	(20,566	)
Sales of properties with previously recorded asset impairment losses:
June 2014(8)	14	43	2,784,098	$	215,900
December 2013	2	2	77,394	$	2,020
November 2013	18	21	2,125,278	50,500
October 2013	1	2	199,418	4,000
October 2013	1	1	665,545	13,900
October 2013	9	41	1,211,536	43,000
August 2013	1	3	129,452	4,100
June 2013	1	1	143,802	5,250
June 2013	1	2	356,045	16,300
May 2013	1	1	57,250	4,025
April 2013	1	1	618,000	830
	36	75	5,583,720	$	143,925

(6) We sold a land parcel.

(7) We provided mortgage financing to the buyer, an unrelated third party, totaling $7.7 million at 6.0% per annum (Note 8).

(8) In connection with this transaction, we recognized a loss on asset impairment of $2.2 million and a loss on early extinguishment of debt of $3.3 million for the year ended December 31, 2014.  The sales price excludes mortgage debt repayments. These properties are included in income from discontinued operations for all years presented.

F-18

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Results of operations for properties sold prior to December 31, 2014, are included in discontinued operations in our consolidated statements of operations. Summarized income statement information for properties included in discontinued operations is as follows (in thousands):

	Year Ended December 31,
	2014			2013
Rental income	$	14,243		$	55,073
Tenant reimbursements and other income	1,900			6,842
Total revenues	16,143			61,915
Operating expenses	7,138			37,027
Depreciation and amortization	—			12,550
General and administrative	10			4,268
Total expenses	7,148			53,845
Operating income	8,995			8,070
Interest and other income	2			65
Interest expense	(608		)	(1,742		)
Income from discontinued operations	$	8,389		$	6,393

Lease Payments

Our real estate properties are generally leased on gross lease, modified gross lease or triple net lease bases pursuant to non-cancelable, fixed term operating leases expiring between 2016 and 2033. Our triple net leases generally require the lessee to pay all property operating costs. Our gross leases and modified gross leases require us to pay all or some property operating expenses and to provide all or some property management services. A portion of these property operating expenses are reimbursed by the tenants.

The future minimum lease payments, excluding tenant reimbursement revenue, scheduled to be received by us during the current terms of our leases as of December 31, 2015 are as follows (in thousands):

2016	$	400,987
2017	380,501
2018	353,286
2019	313,563
2020	275,406
Thereafter	1,175,661
	$	2,899,404

One of our real estate properties, 111 River Street in Hoboken, New Jersey, is subject to a ground lease. The land on this property is leased pursuant to a non-cancelable, fixed term operating ground lease that expires in 2098.

The future minimum lease payments scheduled to be paid by us during the current terms of this ground lease under which we are the lessee, as of December 31, 2015, are as follows (in thousands):

2016	$	1,477
2017	1,477
2018	1,483
2019	1,503
2020	1,503
Thereafter	128,491
	$	135,934

The amount of ground lease expense included in operating expenses during the years ended December 31, 2015, 2014 and 2013, totaled $1.8 million, $1.8 million and $1.9 million, respectively. Ground lease expense includes percentage rent.

F-19

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Note 5. Lease Intangibles

The following table summarizes the carrying amounts for our acquired real estate leases and assumed real estate lease obligations as of December 31, 2015, and 2014, and (in thousands):

	December 31,
	2015			2014
Acquired in-place leases	$	147,056		$	272,077
Acquired above market leases	78,210			121,969
Acquired real estate leases	225,266			394,046
Accumulated amortization, acquired in-place leases	(91,301		)	(136,089		)
Accumulated amortization, acquired above market leases	(45,205		)	(59,670		)
Acquired real estate leases, net	$	88,760		$	198,287
Acquired below market leases	19,742			56,541
Accumulated amortization	(15,446		)	(29,757		)
Assumed real estate lease obligations, net	$	4,296		$	26,784

Amortization of the lease intangibles for the years ended December 31, 2015, 2014, and 2013, is as follows (in thousands):

		December 31,
	Income Statement Location	2015			2014			2013
Amortization of acquired in-place leases	Depreciation and amortization	$	26,787		$	40,493		$	48,023
Amortization of acquired in-place leases	Discontinued operations	—			—			1,720
Amortization of above and below market leases	Increase (decrease) to rental income	(7,515		)	(10,650		)	(10,310		)
Amortization of above and below market leases	Discontinued operations	—			—			775

Future amortization of net intangible lease assets and liabilities to be recognized by us during the current terms of our leases as of December 31, 2015, are approximately (in thousands):

2016	$	18,054
2017	15,213
2018	12,619
2019	8,778
2020	7,535
Thereafter	22,265
	$	84,464

Note 6.  Investment in Direct Financing Lease

We had an investment in a direct financing lease that related to a lease with a term that exceeded 75% of the useful life of an office tower located within a mixed use property in Phoenix, AZ.  In December 2015, we sold this property. Prior to the sale of the property, we recognized income using the effective interest method to produce a level yield on funds not yet recovered.  The carrying amount of our net investment of $12.5 million as of December 31, 2014, is included in other assets in our consolidated balance sheets. 

We monitored the payment history and credit profile of the tenant and have determined that no allowance for losses related to our direct financing lease was necessary at December 31, 2014.

F-20

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Note 7.  Equity Investments

At December 31, 2015, and 2014, we did not have any ownership interests in equity investments. For the years ended December 31, 2014, and 2013, equity in earnings is as follows (in thousands):

	Year Ended December 31,
	2014			2013
SIR	$	24,516		$	21,153
GOV	—			4,111
AIC	(56		)	490
	$	24,460		$	25,754

Investment in SIR

SIR was one of our consolidated subsidiaries until July 2, 2013 and was an unconsolidated equity investment from July 2, 2013 until July 9, 2014. On July 9, 2014, we sold our entire stake of 22,000,000 common shares of SIR. We received $704.8 million in cash representing $32.04 per share and recognized a gain on sale of equity investment of $171.8 million in our consolidated statement of operations. Proceeds from this sale were used to repay our revolving credit facility and certain mortgage loans (Note 9). As a result of this sale, we no longer hold any interest in SIR.

During the second quarter of 2014, SIR issued 10,000,000 common shares in a public offering for $29.00 per common share, raising net proceeds (after deducting underwriters’ discounts and commissions and expenses) of approximately $277.4 million.  We recognized a gain on this sale by an equity investee of $16.9 million as a result of the per share sales price of this transaction being above our per share carrying value.  Our ownership percentage in SIR was reduced to 36.7% as a result of the transaction.

On July 2, 2013, SIR issued and sold to the public 10,500,000 of its common shares for $28.25 per common share. Prior to the completion of this offering, our 22,000,000 common shares of SIR represented approximately 56.0% of SIR's outstanding common shares, and SIR was one of our consolidated subsidiaries. Following the completion of this offering, our 22,000,000 common shares of SIR represented approximately 44.2% of SIR's outstanding common shares and SIR ceased to be our consolidated subsidiary.

Accordingly, after the completion of this offering on July 2, 2013, we no longer consolidated our investment in SIR, but instead accounted for this investment under the equity method. Under the equity method, we recorded our percentage share of net earnings of SIR in our consolidated statements of operations. Prior to July 2, 2013, the operating results and investments of SIR were included in our consolidated results of operations and financial position. On July 2, 2013, our share of the underlying equity of SIR exceeded our carrying value by $17.6 million. As required under GAAP, we amortized this difference to equity in earnings of investees over a 34 year period, which approximates the average remaining useful lives of the buildings owned by SIR as of July 2, 2013. See Notes 1 and 19 for additional information regarding SIR.

For the period from January 1, 2014, through July 9, 2014, we received cash distributions from SIR totaling $20.7 million.

For the period from July 2, 2013, through December 31, 2013, we received cash distributions from SIR totaling $19.8 million.

F-21

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The following unaudited summarized income statement information of SIR for the period from January 1, 2014, through July 9, 2014, and for the year ended December 31, 2013, is as follows (in thousands, except per share data):

	For the Period from January 1, 2014 through July 9, 2014			Year Ended December 31, 2013
Rental income	98,226			$	159,011
Tenant reimbursements and other income	16,980			29,312
Total revenues	115,206			188,323
Operating expenses	20,982			36,382
Depreciation and amortization	20,832			31,091
Acquisition related costs	374			2,002
General and administrative	7,731			12,423
Total expenses	49,919			81,898
Operating income	65,287			106,425
Interest expense	(7,287		)	(13,763		)
Gain on early extinguishment of debt	243			—
Income before income tax expense and equity in earnings of an investee	58,243			92,662
Income tax expense	(90		)	96
Equity in earnings of an investee	32			334
Net income	$	58,185		$	93,092
Weighted average common shares outstanding	52,394			44,565
Net income per common share	$	1.11		$	2.09

Investment in GOV

On March 15, 2013, we sold all 9,950,000 common shares that we owned of GOV in a public offering for $25.20 per common share, raising gross proceeds of $250.7 million ($239.6 million after deducting underwriters' discounts and commissions and expenses). We recognized a gain on this sale of an equity investment of $66.3 million as a result of the per share sales price of this transaction being above our per share carrying value. GOV was our wholly owned subsidiary until its initial public offering in June 2009 when it became a separate public entity.

During the year ended December 31, 2013, we received cash distributions from GOV totaling $4.3 million. We no longer own any interest in GOV.

Investment in AIC

As of May 9, 2014, we had a net investment of $5.8 million in AIC, an insurance company that was owned in equal proportion by us, our former manager Reit Management & Research LLC (RMR), SIR and five other companies to which RMR provides management services.  On May 9, 2014, as a result of the removal of the former Trustees and in accordance with the terms of the shareholder agreement between us and the other AIC shareholders, the other AIC shareholders exercised their right to purchase all of the 20,000 shares of AIC we then owned.  We received $5.8 million in aggregate proceeds from this sale.  We no longer own any interest in AIC.  

Our participation in the AIC property insurance program expired in June 2014.  See Note 19 for additional information about our investment in AIC.

F-22

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Note 8. Other Assets

Real Estate Mortgages Receivable

As of December 31, 2015, and 2014, we had total real estate mortgages receivable with an aggregate carrying value of $8.1 million included in other assets in our consolidated balance sheets.  We provided mortgage financing totaling $7.7 million at 6.0% per annum in connection with our sale of three properties (18 buildings) in January 2013 in Dearborn, MI; this real estate mortgage requires monthly interest payments and matures on January 24, 2023.  We also provided mortgage financing totaling $0.4 million at 6.0% per annum in connection with our sale of a property in Salina, NY in April 2012. This real estate mortgage requires monthly interest payments and matures on April 30, 2019. In addition, in September 2013, another buyer of a property we sold prepaid to us in full a $1.0 million real estate mortgage that was scheduled to mature on July 1, 2017.

We monitor the payment history of the borrowers and have determined that no allowance for losses related to these real estate mortgages receivable were necessary at December 31, 2015, and 2014. 

Deferred Financing Fees, Deferred Leasing Costs and Capitalized Lease Incentives

The following table summarizes our deferred financing fees, deferred leasing costs and capitalized lease incentives as of December 31, 2015, and 2014 (in thousands):

	December 31,
	2015			2014
Deferred financing fees	$	43,346		$	41,339
Accumulated amortization	(25,158		)	(24,478		)
Deferred financing fees, net	$	18,188		$	16,861
Deferred leasing costs	$	166,390		$	184,600
Accumulated amortization	(56,162		)	(58,348		)
Deferred leasing costs, net	$	110,228		$	126,252
Capitalized lease incentives	$	11,623		$	22,650
Accumulated amortization	(2,498		)	(7,459		)
Capitalized lease incentives, net	$	9,125		$	15,191

Future amortization of deferred leasing costs and capitalized lease incentives to be recognized by us during the current terms of our leases as of December 31, 2015 are approximately (in thousands):

	Deferred Leasing Costs		Capitalized Lease Incentives
2016	$	15,933	$	1,528
2017	14,870		1,477
2018	13,369		779
2019	12,246		704
2020	10,324		608
Thereafter	43,486		4,029
	$	110,228	$	9,125

F-23

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Note 9.  Indebtedness

At December 31, 2015 and 2014, our outstanding indebtedness included the following (in thousands):

					December 31,
	Interest Rate at December 31, 2015			Maturity Date	2015			2014
Unsecured revolving credit facility, at LIBOR plus a premium	1.68	%		1/28/2019	$	—		$	—
5-year unsecured term loan, at LIBOR plus a premium	1.83	%		1/28/2020	200,000			—
7-year unsecured term loan, at LIBOR plus a premium	2.23	%		1/28/2022	200,000			—
Unsecured term loan, at LIBOR plus a premium	—	%		—	—			400,000
Unsecured floating rate debt	2.03	%	(1)		$	400,000		$	400,000
5.75% Senior Unsecured Notes due 2015	—	%		—	$	—		$	138,773
6.25% Senior Unsecured Notes due 2016	6.25	%		8/15/2016	139,104			139,104
6.25% Senior Unsecured Notes due 2017	6.25	%		6/15/2017	250,000			250,000
6.65% Senior Unsecured Notes due 2018	6.65	%		1/15/2018	250,000			250,000
5.875% Senior Unsecured Notes due 2020	5.88	%		9/15/2020	250,000			250,000
5.75% Senior Unsecured Notes due 2042	5.75	%		8/1/2042	175,000			175,000
Unsecured fixed rate debt	6.17	%	(1)		$	1,064,104		$	1,202,877
111 Monument Circle	—	%		—	$	—		$	116,000
225 Water Street	—	%		—	—			40,059
111 East Wacker Drive	—	%		—	—			142,666
2501 20th Place South	—	%		—	—			10,267
Parkshore Plaza	5.67	%		5/1/2017	41,275			41,275
1735 Market Street(2)	5.66	%		12/2/2019	169,612			171,498
206 East 9th Street	5.69	%		1/5/2021	27,515			27,965
1320 Main Street	—	%		—	—			38,979
33 Stiles Lane	6.75	%		3/1/2022	2,785			3,132
97 Newberry Road	5.71	%		3/1/2026	6,375			6,819
Secured fixed rate debt	5.68	%	(1)		$	247,562		$	598,660
					$	1,711,666		$	2,201,537
Unamortized net premiums and discounts					(1,342		)	6,128
					$	1,710,324		$	2,207,665

(1) Represents weighted average interest rate at December 31, 2015.

(2) Interest on this loan is payable at LIBOR plus 2.625% but has been fixed for the first seven years to December 1, 2016 by a cash flow hedge which sets the rate at approximately 5.66%.

Unsecured Revolving Credit Facility and Term Loan:

Prior to January 29, 2015, we had a $750.0 million unsecured revolving credit facility. The unsecured revolving credit facility was set to mature on October 19, 2015, and had an interest rate of LIBOR plus a spread, which was 150 basis points as of December 31, 2014.  We paid a facility fee of 35 basis points per annum on the total amount of lending commitments under our revolving credit facility.  Prior to January 29, 2015, we also had a $500.0 million unsecured term loan that was set to mature on December 15, 2016.  Our term loan had an interest rate of LIBOR plus a spread, which was 185 basis points as of December

F-24

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

31, 2014. On December 5, 2014, we paid $100.0 million of our unsecured term loan, reducing our term loan borrowings to $400.0 million.

On January 29, 2015, we entered into a new credit agreement, pursuant to which the lenders agreed to provide (i) a $750.0 million unsecured revolving credit facility, (ii) a $200.0 million5-year term loan facility and (iii) a $200.0 million7-year term loan facility. The new agreement replaced our prior credit agreement, dated as of August 9, 2010, and our prior term loan agreement, dated as of December 16, 2010.  In connection with the new agreement, we recognized a loss on early extinguishment of debt of $0.4 million from the write-off of unamortized deferred financing fees for the year ended December 31, 2015. The revolving credit facility has a scheduled maturity date of January 28, 2019, which maturity date may be extended for up to two additional periods of six months at our option subject to satisfaction of certain conditions and the payment of an extension fee of 0.075% of the aggregate amount available under the revolving credit facility. The 5-year term loan and the 7-year term loan have scheduled maturity dates of January 28, 2020 and January 28, 2022, respectively. We used the proceeds of borrowings under the credit agreement to repay all amounts outstanding and due under the previous term loan agreement.

The credit agreement permits us to utilize up to $100.0 million of the revolving credit facility for the issuance of letters of credit. Amounts outstanding under the credit agreement generally may be prepaid at any time without premium or penalty, subject to certain exceptions. We have the right to request increases in the aggregate maximum amount of borrowings available under the revolving credit facility and term loans up to an additional $1.15 billion, subject to certain conditions.

Borrowings under the 5-year term loan and 7-year term loan will, subject to certain exceptions, bear interest at a LIBOR rate plus a margin of 90 to 180 basis points for the 5-year term loan and 140 to 235 basis points for the 7-year term loan, in each case depending on our credit rating. Borrowings under the revolving credit facility will, subject to certain exceptions, bear interest at a rate equal to, at our option, either a LIBOR rate or a base rate plus a margin of 87.5 to 155 basis points for LIBOR rate advances and 0 to 55 basis points for base rate advances, in each case depending on our credit rating. In addition, we are required to pay a facility fee of 12.5 to 30 basis points, depending on our credit rating, on the borrowings available under the revolving credit facility, whether or not utilized.

Borrowings under our revolving credit facility currently bear interest at LIBOR plus a spread, which was 125 basis points as of December 31, 2015.  As of December 31, 2015, the interest rate payable on borrowings under our revolving credit facility was 1.68%.  As of December 31, 2015, we had no balance outstanding and $750.0 million available under our revolving credit facility. Our term loans currently bear interest at a rate of LIBOR plus a spread, which was 140 and 180 basis points for the 5-year and 7-year term loan, respectively, as of December 31, 2015.  As of December 31, 2015, the interest rates for the amounts outstanding under our 5-year term loan and 7-year term loan were 1.83% and 2.23%, respectively.  As of December 31, 2015, we had $200.0 million outstanding under each of our 5-year and 7-year term loans.

Debt Covenants:

Our public debt indenture and related supplements, our revolving credit facility agreement and our term loan agreement contain a number of financial and other covenants, including covenants that restrict our ability to incur indebtedness or to make distributions under certain circumstances and require us to maintain financial ratios and a minimum net worth.  At December 31, 2015, we believe we were in compliance with all of our respective covenants under our public debt indenture and related supplements, our revolving credit facility and our term loan agreements.

Senior Unsecured Notes:

On May 1, 2015, we redeemed at par $138.8 million of our 5.75% senior unsecured notes due 2015 and recognized a loss on early extinguishment of debt of $0.1 million from the write-off of an unamortized discount and unamortized deferred financing fees.

On November 17, 2014, we redeemed at par $125.0 million of our 7.50% unsecured senior notes due 2019 and recognized a loss on early extinguishment of debt of $1.8 million from the write-off of an unamortized discount and deferred financing fees.

On September 15, 2014, we redeemed at par $33.4 million of our 6.40% unsecured senior notes due 2015.

F-25

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

In March 2013, we purchased a total of $670.3 million of the outstanding principal amount of senior notes for $726.2 million, excluding transaction costs, pursuant to a tender offer. In connection with the purchase of these senior notes, we recognized a combined loss on early extinguishment of debt totaling $60.0 million, which includes the write-off of unamortized discounts and deferred financing fees and expenses.

Mortgage Notes Payable:

At December 31, 2015, five of our properties (8 buildings) with an aggregate net book value of $287.5 million had secured mortgage notes totaling $249.7 million (including net premiums and discounts) maturing from 2017 through 2026.

On December 1, 2015, we repaid at par $116.0 million of 5.24% mortgage debt at 111 Monument Circle and recognized a gain on early extinguishment of debt of $0.6 million for the year ended December 31, 2015 from the write-off of an unamortized premium, net of the write-off of unamortized deferred financing fees.

In accordance with the agreement to sell Illinois Center, we were required to deliver the property unencumbered. On August 3, 2015, prior to the sale, we defeased the outstanding $141.4 million balance of the mortgage loan secured by 111 East Wacker Drive, one of the buildings included in Illinois Center. The defeasance costs and write off of the unamortized deferred financing costs, net of the write off of the unamortized premium, resulted in a net loss on early extinguishment of debt of $3.9 million for the year ended December 31, 2015.

In accordance with the agreement to sell 2501 20th Place South, we were required to deliver the property unencumbered. On June 5, 2015, we prepaid $10.0 million of 7.36% mortgage debt at 2501 20th Place South and recognized a loss on early extinguishment of debt totaling $0.6 million for the year ended December 31, 2015, which consisted of a prepayment premium and the write off of unamortized deferred financing fees, net of the write off of an unamortized premium.

In accordance with the agreement to sell 1320 Main Street, we were required to deliver the property unencumbered. On June 3, 2015, prior to the sale, we defeased the $38.7 million outstanding balance of the mortgage loan secured by 1320 Main Street. The defeasance costs and write off of the unamortized deferred financing costs, net of the write off of the unamortized premium, resulted in a net loss on early extinguishment of debt of $6.2 million for the year ended December 31, 2015.

During the quarter ended June 30, 2014, we made the decision to cease making loan servicing payments on 225 Water Street in Jacksonville, Florida.  The first payment we determined not to make for this property was due on June 11, 2014.  The property was secured by a non-recourse mortgage loan. On October 10, 2014, we were notified by the lender that our decision to cease making loan servicing payments created an event of default effective July 11, 2014, and the lender exercised its option to accelerate the maturity of the unpaid balance of the loan. Beginning July 11, 2014, we accrued interest on this loan at 10.03%, to include the 4.0% of default interest. The lender filed a suit of foreclosure for this property and we cooperated with the lender to allow for a consensual foreclosure process.  On May 22, 2015, title to 225 Water Street was transferred to the lender pursuant to the consensual foreclosure in full satisfaction of the mortgage debt, with a principal balance of $40.1 million. The transaction resulted in a gain on early extinguishment of debt of $17.3 million for the excess of the debt principal balance over the net book value of the property for the year ended December 31, 2015.

On October 31, 2014, we repaid at par the $7.8 million mortgage loan encumbering 6200 Glenn Carlson Drive.

On August 1, 2014, we prepaid at par the $265.0 million of 5.68% mortgage debt at 600 West Chicago Avenue and recognized a net gain on early extinguishment of debt of $6.7 million from the write-off of an unamortized premium, net of the write-off of unamortized deferred financing fees.

On June 27, 2014, we repaid $11.2 million of 6.14% mortgage debt and $8.5 million of 5.78% mortgage debt in connection with the sale of the related properties and recognized a loss on early extinguishment of debt of $3.3 million, included in loss on early extinguishment of debt from discontinued operations, from prepayment penalties and the write-off of unamortized discounts and deferred financing fees.

On March 11, 2014, we prepaid at par the $12.0 million of 4.95% mortgage debt at 3920 Arkwright Road.

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EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Required Principal Payments:

The required principal payments due during the next five years and thereafter under all of our outstanding debt at December 31, 2015 are as follows (in thousands):

2016	$	142,450
2017	294,865
2018	253,847
2019	164,613
2020	451,674
Thereafter	404,217
	$	1,711,666

Note 10.  Shareholders’ Equity

Common Share Issuances:

During the year ended December 31, 2015, we issued 144 common shares to holders of 301 of our series D cumulative convertible preferred shares (series D preferred shares) who elected to convert their series D preferred shares into our common shares.

During the year ended December 31, 2014, we issued 10,412,499 common shares to holders of 10,264,503 of our series D preferred shares who converted their series D preferred shares into our common shares.

During the year ended December 31, 2014, we issued 90,135 common shares to RMR pursuant to the amended and restated business management agreement. See Note 19 for further information regarding this agreement.

See Note 14 for information regarding equity issuances related to share-based compensation.

Common Share Repurchases:

On August 24, 2015, our Board of Trustees approved a common share repurchase plan, which authorizes the repurchase of up to $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. On September 14, 2015, our Board of Trustees authorized the repurchase of up to an additional $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. During the year ended December 31, 2015, we purchased and retired 3,410,300 of our common shares at a weighted average price of $25.76 per share.

Common Share Distributions:

In January 2014, we declared a distribution of $0.25 per common share, or $29.6 million, which we paid on February 21, 2014 to shareholders of record on January 13, 2014. Our revolving credit facility agreement and term loan agreement contain a number of financial and other covenants, including a covenant which restricts our ability to make distributions under certain circumstances. See Note 9 for additional information regarding our revolving credit facility agreement and term loan agreement.

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EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The following characterizes distributions paid per common share for the years ended December 31, 2015, 2014, and 2013:

	Year Ended December 31,
	2015		2014		2013
Ordinary income	—	%	—	%	—	%
Return of capital	—	%	—	%	100.00	%
Capital gain	—	%	100.00	%	—	%
Unrecaptured Section 1250 gain	—	%	—	%	—	%
	—	%	100.00	%	100.00	%

Series D Preferred Shares:

Each of our 4,915,196 series D cumulative convertible preferred shares accrue dividends of $1.625, or 6.50% per annum of the liquidation amount, payable in equal quarterly payments. Our series D preferred shares are convertible, at the holder's option, into our common shares at an initial conversion rate of 0.480775 common shares per series D preferred share, which is equivalent to an initial conversion price of $52.00 per common share, or 2,363,103 additional common shares at December 31, 2015. On or after November 20, 2011, if our common shares trade at or above the then applicable conversion price, we may, at our option, convert some or all of the series D preferred shares into common shares at the then applicable conversion rate. If a fundamental change occurs, which generally will be deemed to occur upon a change in control of us or a termination of trading of our common shares (or other equity securities into which our series D preferred shares are then convertible), holders of our series D preferred shares will have a special right to convert their series D preferred shares into a number of our common shares per $25.00 liquidation preference, plus accrued and unpaid distributions, divided by 98% of the average closing market price of our common shares for a specified period before such event is effective, unless we exercise our right to repurchase these series D preferred shares for cash, at a purchase price equal to 100% of their liquidation preference, plus accrued and unpaid distributions. The issuance of a large number of common shares as a result of the exercise of this conversion right after a fundamental change may have a dilutive effect on income from continuing operations attributable to Equity Commonwealth common shareholders per share for future periods.

The removal of our former Trustees on March 25, 2014, triggered a Fundamental Change Conversion Right of the series D preferred shares, as defined in our Articles Supplementary dated October 10, 2006, setting forth the terms of the series D preferred shares.  Pursuant to such right, the holders of series D preferred shares had the option to elect to convert all or any portion of their series D preferred shares at any time from April 9, 2014 until the close of business on May 14, 2014 into a number of common shares per $25.00 liquidation preference of the series D preferred shares equal to the sum of such $25.00 liquidation preference plus accrued and unpaid dividends to, but not including, May 14, 2014, divided by 98% of the average of the closing sale prices of the common shares for the five consecutive trading days ending on May 9, 2014, or the Fundamental Change Conversion Rate.  Holders of 10,263,003 series D preferred shares elected to exercise their Fundamental Change Conversion Right and converted their series D preferred shares into 10,411,779 of our common shares.  As a result of this transaction, we recognized a non-cash preferred distribution of $16.2 million, for the excess of the market value of the common shares issued above the carrying value of the series D preferred shares redeemed. As of December 31, 2015, we had 4,915,196 outstanding series D preferred shares that were convertible into 2,363,103 of our common shares.

Series E Preferred Shares:

Each of our 11,000,000 series E preferred shares has a liquidation preference of $25.00 and requires dividends of $1.8125, or 7.25% per annum of the liquidation amount, payable in equal quarterly payments. The series E preferred shares are redeemable at our option for $25.00 each plus accrued and unpaid distributions at any time on or after May 15, 2016 or if a change of control occurs which results in our common shares (or the common securities of an acquiring or surviving entity) not being listed or quoted on the NYSE or certain other exchanges or quotation systems. Also, upon the occurrence of such a change of control, holders of series E preferred shares that we do not elect to redeem may at their option convert those series E preferred shares into our common shares (or certain alternative consideration) at a conversion rate generally based on their $25.00 liquidation preference per share, plus accrued and unpaid distributions, and the market price of our common shares at the time of conversion, subject to a cap.

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EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Preferred Share Distributions:

In 2015, our Board of Trustees declared distributions on our series D preferred shares and series E cumulative redeemable preferred shares to date as follows:

Declaration Date	Record Date	Payment Date	Series D Dividend Per Share		Series E Dividend Per Share
January 16, 2015	February 2, 2015	February 17, 2015	$	0.40625	$	0.453125
April 8, 2015	May 1, 2015	May 15, 2015	$	0.40625	$	0.453125
July 9, 2015	July 31, 2015	August 17, 2015	$	0.40625	$	0.453125
October 9, 2015	November 2, 2015	November 16, 2015	$	0.40625	$	0.453125

Under our governing documents and Maryland law, distributions to our shareholders are to be authorized and declared by our Board of Trustees.  Additionally, the removal of our former Trustees, which occurred on March 25, 2014, constituted an event of default under our term loan and revolving credit facility agreements, under which we generally are prevented from making any distributions or paying any dividends during the pendency of an event of default.  As a result of the foregoing, we were unable to declare and pay dividends between March 25, 2014, and June 6, 2014, the date on which we obtained waivers of the aforementioned events of default from our lenders. 

Alternative Minimum Tax:

Alternative minimum tax adjustments are to be apportioned between a REIT and its shareholders under Internal Revenue Code Section 59(d). Although regulations have not yet been issued under that provision, based on regulations issued pursuant to a similar provision of prior law and the legislative history of the current provision, it appears that such alternative minimum tax adjustments are to be apportioned to a REIT’s shareholders to the extent that the REIT distributes its regular taxable income. It is our policy to distribute all of our regular taxable income and accordingly, all of our alternative minimum tax adjustments are being apportioned to our shareholders.

We have determined that 0%, 15.41% and 0% of each distribution to our shareholders for the tax years ended December 31, 2015, 2014, and 2013, respectively, consists of an alternative minimum tax adjustment.

Note 11.  Cumulative Other Comprehensive Loss

The following tables present the amounts recognized in cumulative other comprehensive loss by component for the year ended December 31, 2015 (in thousands):

	Year Ended December 31, 2015
	Unrealized Loss on Derivative Instruments and Other Assets			Foreign Currency Translation Adjustments			Total
Balances as of January 1, 2015	$	(4,299	)	$	(48,917	)	$	(53,216	)
Other comprehensive loss before reclassifications	(1,232		)	(14,290		)	(15,522		)
Amounts reclassified from cumulative other comprehensive loss to net income	1,844			63,207			65,051
Net current period other comprehensive income	612			48,917			49,529
Balances as of December 31, 2015	$	(3,687	)	$	—		$	(3,687	)

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EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The following tables present reclassifications out of cumulative other comprehensive loss for the year ended December 31, 2015 (in thousands):

	Year Ended December 31, 2015
Details about Cumulative Other Comprehensive Loss Components	Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income			Affected Line Items in the Statement of Operations
Interest rate swap contracts	$	4,924		Interest expense
Foreign currency translation adjustment activity	63,207			Gain on sale of properties
Realized gain on available for sale securities	(3,080		)	Interest and other income
	$	65,051

Note 12.  Income Taxes

Our provision for income taxes consists of the following (in thousands):

	Year Ended December 31,
	2015			2014		2013
Current:
State	$	270		$	350	$	519
Federal	513			—		—
Foreign	2,336			2,772		2,572
	3,119			3,122		3,091
Deferred:
Foreign	(755		)	69		(457		)
	(755		)	69		(457		)
Income tax expense	$	2,364		$	3,191	$	2,634

Federal income tax expense for the year ended December 31, 2015 relates to taxes incurred as a result of a taxable built-in gain triggered by the sale of a property that was previously owned by a C corporation. As a result of the disposition of the Australian properties, we incurred net income tax expense of $1.6 million for the year ended December 31, 2015.

A reconciliation of our effective tax rate and the U.S. Federal statutory income tax rate is as follows:

	Year Ended December 31,
	2015		2014		2013
Taxes at statutory U.S. federal income tax rate	35.00	%	35.00	%	35.00	%
Dividends paid deduction and net operating loss utilization	(35.00	)%	(35.00	)%	(35.00	)%
Federal taxes on built-in gain	0.50	%	—	%	—	%
State, local, and foreign income taxes	1.81	%	11.73	%	(1.71	)%
Effective tax rate	2.31	%	11.73	%	(1.71	)%

Deferred income tax assets and liabilities, net of a valuation allowance, represent the tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes, and are determined using tax rates expected to be in effect when the deferred income tax assets and liabilities are anticipated to be paid or recovered. At December 31, 2014, we had deferred tax assets of $2.4 million, net of a valuation allowance of $0.6 million, and deferred tax liabilities of $3.1 million, which primarily relate to different carrying amounts for financial reporting and for Australian income tax purposes related to our properties and operations in Australia. The deferred tax assets primarily relate to depreciation differences and the deferred tax liabilities primarily relate to straight line rent adjustments. During the year ended December 31, 2015, we sold our Australian properties (Note 4) and as of December 31, 2015, we do not have any deferred tax assets or

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EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

liabilities related to our Australian properties. We generated significant net operating losses through the 2015 property sales and we have fully reserved the associated deferred tax assets due to the uncertainty of our ability to utilize the net operating losses in the future.

Note 13.  Derivative Instruments

Risk Management Objective of Using Derivatives

We are exposed to certain risks relating to our ongoing business operations, including the effect of changes in interest rates.  The only risk we currently manage by using derivative instruments is a part of our interest rate risk. 

We may use derivative financial instruments, including interest rate swaps, caps, options, floors and other interest rate derivative contracts, to hedge all or a portion of the interest rate risk associated with our borrowings. The principal objective of such arrangements is to minimize the risks and/or costs associated with our operating and financial structure as well as to hedge specific anticipated transactions. We do not intend to utilize derivatives for speculative or other purposes other than interest rate risk management. The use of derivative financial instruments carries certain risks, including the risk that the counterparties to these contractual arrangements are not able to perform under the agreements. To mitigate this risk, we only enter into derivative financial instruments with counterparties with high credit ratings and with major financial institutions with which we and our affiliates may also have other financial relationships. We do not anticipate that any of the counterparties will fail to meet their obligations.

Cash Flow Hedges of Interest Rate Risk

Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we periodically use interest rate swaps, caps, or other similar instruments as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for us making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in cumulative other comprehensive income (loss) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During 2015, such derivatives were used to hedge the variable cash flows associated with variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings.

Amounts reported in cumulative other comprehensive loss related to derivatives will be reclassified to interest expense as interest payments are made on our variable-rate debt. During the next twelve months, we estimate that an additional $3.7 million will be reclassified from cumulative other comprehensive loss as an increase to interest expense.

We have interest rate swap agreements to manage our interest rate risk exposure on $169.6 million of mortgage debt due 2019, which require interest at a spread over LIBOR.  The interest rate swap agreements utilized by us qualify as cash flow hedges and effectively modify our exposure to interest rate risk by converting our floating interest rate debt to a fixed interest rate basis for this loan through December 1, 2016, thus reducing the impact of interest rate changes on future interest expense.  As of December 31, 2015, we had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk:

Interest Rate Derivative	Number of Instruments	Notional Amount (in thousands)
Interest rate swap	2	$169,612

The table below presents the fair value of our derivative financial instruments as well as their classification on the consolidated balance sheets as of December 31, 2015, and 2014 (amounts in thousands):

		Fair Value as of December 31,
Interest Rate Derivative Designated as Hedging Instrument	Balance Sheet Location	2015		2014
Pay-fixed swaps	Accounts payable and accrued expenses	$	3,687	$	7,462

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EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The table below details the location in the financial statements of the gain or loss recognized on interest rate derivatives designated as cash flow hedges for the years ended December 31, 2015, 2014, and 2013 (amounts in thousands):

	Year Ended December 31,
	2015			2014			2013
Balance at beginning of period	$	(7,462	)	$	(11,706	)	$	(16,624	)
Amount of loss recognized in cumulative other comprehensive loss	(1,149		)	(776		)	(103		)
Amount of loss reclassified from cumulative other comprehensive loss into interest expense	4,924			5,020			5,021
Unrealized gain on derivative instruments	3,775			4,244			4,918
Balance at end of period	$	(3,687	)	$	(7,462	)	$	(11,706	)

Credit-risk-related Contingent Features

We have agreements with each of our derivative counterparties that contain a provision where if we either default or are capable of being declared in default on any of our indebtedness, then we could also be declared in default on our derivative obligations.

As of December 31, 2015, the fair value of derivatives in a net liability position including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $4.1 million. As of December 31, 2015, we have not posted any collateral related to these agreements and were not in breach of any agreement provisions. If we had breached any of these provisions, we could have been required to settle our obligations under the agreements at their aggregate termination value of $4.1 million at December 31, 2015.

Note 14. Share-Based Compensation

Equity Commonwealth 2015 Omnibus Incentive Plan

On June 16, 2015, at our 2015 annual meeting of shareholders, our shareholders approved the Equity Commonwealth 2015 Omnibus Incentive Plan (the 2015 Incentive Plan). The 2015 Incentive Plan replaced the Equity Commonwealth 2012 Equity Compensation Plan (as amended, the 2012 Plan). The Board of Trustees approved the 2015 Incentive Plan, subject to shareholder approval, on March 18, 2015 (the Effective Date). On January 26, 2016, the Board of Trustees approved an amendment to the 2015 Incentive Plan to allow the Compensation Committee (Committee) to authorize in an award agreement a transfer of all or a part of certain equity awards not for value to a “family member” (as defined in the 2015 Incentive Plan). The following description of certain terms of the 2015 Incentive Plan is qualified in all respects by the terms of the 2015 Incentive Plan.

Eligibility. Awards may be granted under the 2015 Incentive Plan to employees, officers and non-employee directors of the Company, its subsidiaries or its affiliates, or consultants and advisors (who are natural persons) providing services to the Company, its subsidiaries or its affiliates, or any other person whose participation in the 2015 Incentive Plan is determined by the Committee to be in the best interests of the Company.

Term. The 2015 Incentive Plan terminates automatically ten years after the Effective Date, unless it is terminated earlier by the Board of Trustees.

Shares Available for Issuance. Subject to adjustment as provided in the 2015 Incentive Plan, the maximum number of common shares of the Company that are available for issuance under the 2015 Incentive Plan is 3,250,000 shares.

Awards. The following types of awards may be made under the 2015 Incentive Plan, subject to limitations set forth in the 2015 Incentive Plan:

· Stock options;

· Stock appreciation rights;

· Restricted stock;

· Restricted stock units;

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EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

· Unrestricted stock;

· Dividend equivalent rights;

· Performance shares and other performance-based awards;

· Limited partnership interests in any partnership entity through which the Company may conduct its business in the future;

· Other equity-based awards; and

· Cash bonus awards.

Recipients of the Company’s restricted shares have the same voting rights as any other common shareholder. During the period of restriction, the Company’s unvested restricted shareholders are eligible to receive dividend payments on their shares at the same rate and on the same date as any other common shareholder. Recipients of the Company’s restricted stock units (RSUs) are entitled to receive dividends with respect to the common shares underlying the RSUs if and when the RSUs are earned, at which time the recipient will be entitled to receive an amount in cash equal to the aggregate amount of ordinary cash dividends that would have been paid in respect of the common shares underlying the recipient’s earned RSUs had such common shares been issued to the recipient on the first day of the performance period.

Administration. The 2015 Incentive Plan will be administered by the Committee, which will determine all terms and recipients of awards under the 2015 Incentive Plan.

2015 Equity Award Activity

On June 16, 2015, in accordance with the Company’s compensation plan for independent Trustees, the Committee awarded each of the nine independent Trustees $0.1 million in restricted shares as part of their compensation for the 2015-2016 year of service on the Board of Trustees. These awards equated to 3,843 shares per Trustee, for a total of 34,587 shares, valued at $26.02 per share, the closing price of our common shares on the NYSE on that day. These shares vest one year after the date of the award.

On January 28, 2015, the Committee approved a grant of 126,319 restricted common shares and 639,250 RSUs at target to the Company’s officers, certain employees and to Mr. Zell, the Chairman of our Board of Trustees, as part of their compensation for fiscal year 2014.  

The restricted shares are service based awards and vest over a four-year period. The restricted shares were granted on January 28, 2015 and were valued at $26.58 per share, the closing price of our common shares on the NYSE on that day.

The 776,456 unvested restricted shares as of December 31, 2015 are scheduled to vest as follows: 188,879 shares in 2016, 185,467 shares in 2017, 339,759 shares in 2018 and 62,351 shares in 2019. As of December 31, 2015, the estimated future compensation expense for all unvested restricted share grants was $14.6 million. Compensation expense for the restricted share awards is being recognized on a straight-line basis over the requisite service period for each separately vesting portion of the award. The weighted average period over which the future compensation expense will be recorded for the restricted shares is approximately 2.8 years.

The RSUs are market based awards with a service condition and grant recipients may earn the RSU grants based on the Company’s total shareholder return (TSR) relative to the TSR's for the constituent REITs that comprise the NAREIT Office Index for the performance period of January 28, 2015 - January 28, 2018. Following the end of the performance period on January 28, 2018, the number of earned awards will be determined. The earned awards vest in two tranches with 50% of the earned award vesting on January 28, 2018 and the remaining 50% of the earned award vesting on January 28, 2019, subject to the grant recipient’s continued employment. Recipients of the Company’s RSUs are entitled to receive dividends with respect to the common shares underlying the RSUs if and when the RSUs are earned. To the extent that an award does not vest, the dividends will be forfeited. Compensation expense for the RSU awards was determined using a Monte Carlo simulation model and is being recognized ratably from the grant date to the vesting date of each tranche.

2014 Equity Award Activity

On October 28, 2014, the Committee approved the one-time grant of restricted common shares and restricted share units under the 2012 Plan to certain of the Company’s officers and employees and to Mr. Zell, the Chairman of our Board of Trustees.  The Committee also approved the one-time grant of restricted common shares under the 2012 Plan to our

F-33

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

independent Trustees, a grant of restricted common shares to each independent Trustee as annual compensation for his or her service as a Trustee, and a pro-rata grant of fully vested common shares for five of our independent Trustees for their service from May 23, 2014 through July 31, 2014. 

Outstanding Equity Awards

The table below presents a summary of restricted share and RSU activity under the 2015 Incentive Plan and the 2012 Plan for the years ended December 31, 2015, and 2014, excluding restricted shares granted to our former Trustees, former officers and certain employees of RMR under the terms of our 2012 Plan (which grants are further described below):

	Number of Restricted Shares		Weighted Average Grant Date Fair Value		Number of RSUs		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013	—		$	—	—		$	—
Granted	713,727		26.66		1,266,237		15.99
Vested	(3,545	)	26.66		—		—
Outstanding at December 31, 2014	710,182				1,266,237
Granted	160,906		26.46		639,250		15.47
Vested	(86,517	)	26.02		—		—
Forfeited	(8,115	)	26.64		(21,377	)	15.80
Outstanding at December 31, 2015	776,456				1,884,110

The RSUs are market based awards with a service condition and grant recipients may earn between 0% - 100% of the RSU grant based on the Company’s TSR relative to the TSR for the NAREIT Office Index for the period from October 28, 2014 - October 28, 2017. Following the end of the performance period on October 28, 2017, the number of earned awards will be determined. The earned awards vest in two tranches with 50% of the earned award vesting on October 28, 2017 and the remaining 50% of the earned award vesting on October 28, 2018 subject to the grant recipient’s continued employment.

As of December 31, 2015, the estimated future compensation expense for all unvested RSUs was $20.3 million. The weighted average period over which the future compensation expense will be recorded for the RSUs is approximately 2.4 years.

The assumptions and fair values for the RSUs granted for the years ended December 31, 2015, and 2014 are included in the following table on a per share basis.

	2015			2014
Fair value of RSUs granted	$	15.47		$	15.99
Expected term (years)	4			4
Expected volatility	—			—
Expected dividend yield	1.88		%	1.88		%
Risk-free rate	0.81		%	0.84		%

During the years ended December 31, 2015 and 2014, we recorded $15.4 million and $2.6 million, respectively, of compensation expense, net of forfeitures, in general and administrative expense for grants to our Board of Trustees and the Company's employees related to our Plan. At December 31, 2015, 3,215,413 common shares remain available for issuance under the Plan.

2012 Equity Compensation Plan

Prior to the adoption of the 2015 Incentive Plan, we had common shares available for issuance under the 2012 Plan. The 2012 Plan was adopted in May 2012 and replaced our 2003 Incentive Share Award Plan, or the 2003 Plan. We awarded common shares to our former officers and certain employees of RMR pursuant to both of these plans. On January 28, 2014, we granted 2,000 common shares of beneficial interest, par value $0.01 per share, valued at $23.46 per share, the closing price of

F-34

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

our common shares on the New York Stock Exchange, or NYSE, on that day, to two of our former Trustees as part of their then annual compensation. We also awarded each of our former Trustees 2,000 common shares in 2013 with an aggregate market value of $0.2 million on the date of grant, as part of their annual compensation. The common shares awarded to our former Trustees vested immediately. We include the value of awarded shares in general and administrative expenses at the time the awards vest. See Note 19 for further information regarding grants of restricted shares we made to our former officers and certain employees of RMR. 

On October 28, 2014, the Board of Trustees approved an amendment to the 2012 Plan to permit the Company to issue RSUs.  Additionally, on October 28, 2014, the Committee approved new forms of Restricted Share and Restricted Share Unit Agreements to be used for grants of restricted common shares to members of the Board of Trustees, as well as grants of restricted common shares and restricted share units to officers and employees of the Company. 

The 2015 Incentive Plan replaced the 2012 Plan. No future grants will be made under the 2012 Plan, although the terms and conditions of the 2012 Plan will continue to govern any outstanding awards granted under the 2012 Plan. A summary of shares granted and vested to our former Trustees, former officers and certain employees of RMR under the terms of our 2012 Plan and our 2003 Plan for the years ended December 31, 2014, and 2013, is as follows:

	Number of Shares		Weighted Average Grant Date Fair Value
Unvested shares at December 31, 2012	114,703		19.39
Granted	83,450		23.29
Vested	(66,639	)	23.06
Forfeited	(600	)	22.49
Unvested shares at December 31, 2013	130,914		20.70
Granted	4,000		23.46
Vested	(134,914	)	25.79
Unvested shares at December 31, 2014	—		—

As a result of the removal of our former Trustees on March 25, 2014, the vesting of 130,914 common shares previously issued to our former officers and certain employees of RMR pursuant to our equity compensation plans accelerated in accordance with the terms of their governing share grants.  During the year ended December 31, 2014, we recorded $3.4 million of general and administrative expense related to the vesting of these shares.

During the years ended December 31, 2014, and 2013, we recorded $3.4 million and $1.8 million, respectively, of compensation expense for former Trustees, former officers and certain employees of RMR under the terms of our 2012 Plan and our 2003 Plan. In addition, during the period that SIR was our consolidated subsidiary, we recorded compensation expense related to SIR's equity compensation plan of $0.4 million for the year ended December 31, 2013.

Note 15.  Defined Contribution Plan

We have a defined contribution plan that covers employees meeting eligibility requirements. We match 100% of the first 3% of compensation that an employee elects to defer plus 50% of compensation that an employee elects to defer exceeding 3% but not exceeding 5%, subject to a maximum of $8,000. The Company’s matching contribution vests immediately. The Company's contributions were $0.3 million for the year ended December 31, 2015.

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Note 16.  Fair Value of Assets and Liabilities

The table below presents certain of our assets and liabilities measured at fair value during 2015 and 2014, categorized by the level of inputs used in the valuation of each asset and liability (dollars in thousands):

				Fair Value at December 31, 2015 Using
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
Description	Total			(Level 1)		(Level 2)			(Level 3)
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$	(3,687	)	$	—	$	(3,687	)	$	—
Derivative liability	(7,219		)	—		—			(7,219		)

				Fair Value at December 31, 2014 Using
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
Description	Total			(Level 1)		(Level 2)			(Level 3)
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$	(7,462	)	$	—	$	(7,462	)	$	—
Derivative liability	(6,658		)	—		—			(6,658		)

Effective Portion of Interest Rate Swap Contracts

The fair value of our interest rate swap contracts is determined using the net discounted cash flows of each derivative based on the market based interest rate curve (level 2 inputs) and adjusted for our credit spread and the actual and estimated credit spreads of the counterparties (level 3 inputs).  Although we have determined that the majority of the inputs used to value our derivatives fall within level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default by us and the counterparties.  As of December 31, 2015, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivatives.  As a result, we have determined that our derivative valuations in their entirety are classified as level 2 inputs in the fair value hierarchy.

Derivative Liability

On July 31, 2014, our shareholders voted to approve the reimbursement of expenses incurred by Related/Corvex (Note 17). Approximately $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period after the date on which the reimbursement was approved by shareholders, and the remaining approximately $8.4 million will be reimbursed only if the average closing price of our common shares is at least $26.00 (as adjusted for any share splits or share dividends) during the one year period between the first and second anniversaries of the date on which the reimbursement was approved by shareholders. The average closing price of our common shares was at least $26.00 during the first one year period after the date on which the reimbursement was approved by shareholders, and in August 2015, we paid $8.4 million to Related/Corvex. The potential future reimbursement represents a derivative instrument as codified in ASC 815 Derivatives and Hedging which requires the potential future reimbursement to be recorded at fair value at each reporting date.

We recognized expense of $9.0 million for the year ended December 31, 2015, which was recorded in general and administrative expenses in our consolidated statement of operations for the year ended December 31, 2015. The valuation

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techniques and significant unobservable inputs used for our level 3 fair value measurement at December 31, 2015, and 2014 were as follows:

Description	Fair Value at December 31, 2015		Primary Valuation  Technique	Unobservable Inputs	Rate
Derivative liability	$	7,219	Monte Carlo simulation	Risk-free rate	0.52%
				Volatility	20.0%

Description	Fair Value at December 31, 2014		Primary Valuation  Technique	Unobservable Inputs	Rate
Derivative liability	$	6,658	Monte Carlo simulation	Risk-free rate	0.50%
				Volatility	20.0%

Properties Held and Used

As part of our disposition plan, and pursuant to our accounting policy, in 2015, we evaluated the recoverability of the carrying values of each of the real estate assets that comprised our portfolio and determined that due to the shortening of the expected periods of ownership as a result of the disposition plan, it was necessary to reduce the net book value of a portion of the real estate assets in our portfolio to reduce the assets to their estimated fair values.  During the year ended December 31, 2015, we recorded an impairment charge of $17.2 million in accordance with our impairment analysis procedures.

In 2014, we ceased to actively market 31 properties with a combined 5.6 million square feet which we had previously classified as held for sale as of December 31, 2013, which were not under agreement for sale when our former Trustees were removed. These properties were reclassified to properties held and used in operations because they no longer meet the requirements for classification as held for sale. Operating results for these properties were reclassified from discontinued operations to continuing operations for all periods presented herein. In connection with this reclassification, we reversed previously recorded impairment losses totaling $4.8 million in 2014, which includes the elimination of estimated costs to sell.

In connection with the internalization of management, we developed a disposition plan in the fourth quarter of 2014. Through this plan, we expect to dispose of many of our assets in the coming years. Pursuant to our accounting policy, we evaluated the recoverability of the carrying values of each of the real estate assets that comprised our portfolio and determined that due to the shortening of the expected periods of ownership, as a result of the disposition plan, that it was necessary to reduce the net book value of a portion of the real estate assets in our portfolio.  As a result, we recorded a loss on asset impairment for 34 properties of $167.1 million in 2014, to reflect the estimated fair values of those real estate assets in our portfolio that failed the recoverability test because the net book values exceeded their fair values.  We reduced the aggregate carrying value of these properties from $581.7 million to their estimated fair value of $414.6 million, reflected in the table below.

The fair value measurements used in the evaluation of our real estate assets are considered to be Level 3 valuations within the fair value hierarchy outlined above, as there are significant unobservable inputs. Examples of inputs that were utilized in the fair value calculations include estimated holding periods, discount rates, market capitalization rates, expected lease rental rates, and third party broker information. The valuation techniques and significant unobservable inputs used for our level 3 fair value measurements at December 31, 2014 were as follows:

Description	Fair Value at December 31, 2014		Primary Valuation Techniques	Unobservable Inputs	Weighted Average(1)
Properties held and used on which we recognized impairment losses	$	414,625	Discounted cash flows	Discount rate	10.2%
				Exit capitalization rate	9.1%

(1) Calculated as a weighted average based on the fair value at December 31, 2014.

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In 2014, we made the decision to cease making loan servicing payments on 225 Water Steet in Jacksonville, Florida (Note 9).  As a result of the decision to discontinue making loan servicing payments on this property, we recorded a loss on asset impairment totaling $22.7 million to reduce the aggregate carrying value of this property from $42.3 million to its estimated fair value of $19.6 million.  We used discounted cash flow analysis and third party broker information (level 3 inputs) in determining the fair value of this property.  The valuation techniques and significant unobservable inputs used for our level 3 fair value measurements at June 30, 2014 were as follows:

Description	Fair Value at June 30, 2014		Primary Valuation Techniques	Unobservable Inputs	Rate
225 Water Street	$	19,589	Discounted cash flows	Discount rate	8%
				Exit capitalization rate	8%

Financial Instruments

In addition to the assets and liabilities described in the above table, our financial instruments include our cash and cash equivalents, real estate mortgages receivable, restricted cash, senior unsecured debt and mortgage notes payable.  At December 31, 2015 and 2014, the fair value of these additional financial instruments were not materially different from their carrying values, except as follows (in thousands):

	December 31, 2015				December 31, 2014
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Senior unsecured debt and mortgage notes payable, net	$	1,710,324	$	1,749,211	$	2,207,665	$	2,263,535

The fair values of our senior notes and mortgage notes payable are based on estimates using discounted cash flow analyses and currently prevailing interest rates adjusted by credit risk spreads (level 3 inputs).

Other financial instruments that potentially subject us to concentrations of credit risk consist principally of rents receivable; however, as of December 31, 2015, no single tenant of ours is responsible for more than 4% of our total annualized rents.

Our derivative financial instruments, including interest rate swaps, are entered with major financial institutions and we monitor the amount of credit exposure to any one counterparty.

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Note 17.  Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per share (amounts in thousands except per share amounts):

	Year Ended December 31,
	2015			2014			2013
Numerator for earnings per common share - basic and diluted:
Income (loss) from continuing operations	$	99,857		$	21,206		$	(37,318	)
Net income attributable to noncontrolling interest in consolidated subsidiary	—			—			(20,093		)
Preferred distributions	(27,924		)	(32,095		)	(44,604		)
Excess fair value of consideration over carrying vale of preferred shares	—			(16,205		)	—
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders	71,933			(27,094		)	(102,015		)
Discontinued operations	—			2,806			(119,649		)
Numerator for net income (loss) per share - basic and diluted	$	71,933		$	(24,288	)	$	(221,664	)
Denominator for earnings per common share - basic and diluted:
Weighted average number of common shares outstanding - basic	128,621			125,163			112,378
Weighted average number of common shares outstanding - diluted(1)	129,437			125,163			112,378
Earnings per share - basic:
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders	$	0.56		$	(0.21	)	$	(0.91	)
Discontinued operations	—			0.02			(1.06		)
Net income (loss) per share - basic	$	0.56		$	(0.19	)	$	(1.97	)
Earnings per share - diluted:
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders	$	0.56		$	(0.21	)	$	(0.91	)
Discontinued operations	—			0.02			(1.06		)
Net income (loss) per share - diluted	$	0.56		$	(0.19	)	$	(1.97	)
Anti-dilutive securities:
Effect of Series D preferred shares; 6 1/2% cumulative convertible(2)	2,363			4,175			7,298

(1) As of December 31, 2015, we had granted RSUs to certain employees, officers, and the chairman of the Board of Trustees.  The RSUs contain both service and market-based vesting components.  None of the RSUs have vested.  If the market-based vesting component was measured as of December 31, 2015, 1,143 common shares would be issued to the RSU holders, and no shares would have been issued for the other periods presented.  Using a weighted average basis, 816 common shares are reflected in diluted earnings per share for the year ended ended December 31, 2015.

(2) The Series D preferred shares are excluded from the diluted earnings per share calculation because including the Series D preferred shares would also require that the preferred distributions be added back to net income, resulting in anti-dilution during the periods presented.

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Note 18.  Segment Information

Our primary business is the ownership and operation of office properties.  Due to significant dispositions during 2015, during the fourth quarter of 2015 we changed the composition of our operating segments from two reportable segments (central business district properties and suburban properties) to one reportable segment. This change was made based on the financial information reviewed and used by the chief operating decision maker to make operating decisions, assess performance, develop strategy and allocate capital resources. More than 90% of our revenues are from office properties.

Note 19.  Related Person Transactions

The following discussion includes a description of our related person transactions for the years ended December 31, 2015, 2014 and 2013. Certain of these related person transactions, and their approvals, occurred prior to the election of our new Board of Trustees at the Special Meeting and the appointment of our current executive officers following the Special Meeting. The disclosure below under “—Transactions with Prior Related Persons” describes our transactions and approvals with our prior related persons.

Related Person Transactions Following the Special Meeting:

Equity Group Investments and associated entities: Effective February 1, 2016, we entered into a lease with Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman, for storage space in the basement of the building. The lease expires December 31, 2020, provided each party has the right to terminate on 30 days' prior written notice, and the payment is nominal. This lease was approved by the Audit Committee of the Board of Trustees.

Effective July 20, 2015, we entered into a lease with Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman, to occupy office space on the twentieth and twenty-first floors of Two North Riverside Plaza in Chicago, Illinois. The initial term of the lease is approximately five years, with one5-year renewal option. The lease payment is approximately $0.5 million for the initial year beginning in 2016, and $0.8 million annually thereafter. This lease was approved by the Audit Committee of the Board of Trustees on June 16, 2015.

Effective June 1, 2014, we entered into a one-year license agreement with Equity Group Investments, a private investment firm (Equity Group), to use office space on the sixth floor at Two North Riverside Plaza in Chicago, Illinois. The license fee was $0.2 million for the initial year. The license fee includes the non-exclusive use of additional areas on the sixth floor (such as conference rooms and common areas), certain administrative services (such as mail room services and reception desk staffing), office equipment, office furniture, supplies, licensee’s share of building operating expenses and real estate taxes and access to one parking space. Mr. Zell, our Chairman, is the Chairman and Chief Executive Officer of Equity Group, and Mr. Helfand, our President and Chief Executive Officer, is the Co-President of Equity Group. This license agreement was approved by the Audit Committee of the Board of Trustees and was scheduled to expire on May 31, 2015. On May 4, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the license agreement through November 30, 2015. The license fee payment is approximately $0.1 million for the extended term. On November 2, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the license agreement through January 31, 2016, for a maximum license fee payment of approximately $0.1 million. The extension of the license agreement was terminated as of December 30, 2015.

Effective June 1, 2014, we entered into a one-year lease with one3-month renewal option with Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman, to occupy office space on the fourteenth floor at Two North Riverside Plaza in Chicago, Illinois. The lease payment was $0.2 million for the initial term. This lease was terminated, effective January 31, 2015. This lease was approved by the Audit Committee of the Board of Trustees.

Effective July 31, 2014, we entered into a sublease with Equity Residential Management, L.L.C. to occupy office space on the tenth floor of Two North Riverside Plaza in Chicago, Illinois. Equity Residential Management, L.L.C. leases the space from Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman. The initial term of the sublease was approximately seven months commencing on or about October 22, 2014, expiring on May 31, 2015, with one3-month renewal option. The sublease payment was approximately $0.2 million for the initial term. This sublease was approved by the Audit Committee of the Board of Trustees. On May 4, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the sublease through November 30, 2015. The sublease payment is

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approximately $0.2 million for the extended term. On November 2, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the sublease through January 31, 2016, for a maximum sublease payment of approximately $0.1 million. The extension of the sublease was terminated as of December 30, 2015.

Related/Corvex: On July 31, 2014, at the reconvened session of our 2014 annual meeting of shareholders, our shareholders voted to approve the reimbursement of approximately $33.5 million of expenses incurred by Related/Corvex in connection with their consent solicitations to remove our former Trustees and elect the new Board of Trustees and to engage in related litigation. Approximately $16.7 million was paid during the year ended December 31, 2014.  Approximately $8.4 million was to be reimbursed only if the average closing price of our common shares is at least $26.00 (as adjusted for any share splits or share dividends) during the one year period after the date on which the reimbursement was approved by shareholders, and the remaining approximately $8.4 million will be reimbursed only if the average closing price of our common shares is at least $26.00 (as adjusted for any share splits or share dividends) during the one year period between the first and second anniversaries of the date on which the reimbursement was approved by shareholders. The average closing price of our common shares was at least $26.00 during the first one year period after the date on which the reimbursement was approved by shareholders, and in August 2015, we paid $8.4 million to Related/Corvex.

Transactions with Prior Related Persons:

RMR: Prior to entering into the Termination and Cooperation Agreement with RMR, as further described below, we had three primary agreements with RMR and its affiliates to provide management and administrative services to us: (i) a business management agreement, which relates to our business generally, (ii) a property management agreement, which relates to our property level operations, and (iii) an Australia business and property management agreement, which relates to our Australian properties.

During the time we were externally managed by RMR, one of our former Managing Trustees, Mr. Barry Portnoy, was Chairman, majority owner and an employee of RMR. Another former Managing Trustee and our former President, Mr. Adam Portnoy, is the son of Mr. Barry Portnoy, and was an owner, President, Chief Executive Officer and a director of RMR. Mr. John Popeo, our former Treasurer and Chief Financial Officer, and Mr. David Lepore, our former Chief Operating Officer, were also officers of RMR. Two of our former independent Trustees served as independent directors or independent trustees of other public companies to which RMR provided management services. Mr. Barry Portnoy served as a managing director or managing trustee of a majority of the public companies to which RMR or its affiliate provided management services and Mr. Adam Portnoy served as a managing trustee of a majority of those companies. In addition, officers of RMR served as officers of those companies. As a result of the removal, effective March 25, 2014, of Mr. Barry Portnoy and Mr. Adam Portnoy as Trustees of the Company and the resignation on May 23, 2014, of Mr. Adam D. Portnoy, Mr. John C. Popeo, Mr. David M. Lepore and other officers of RMR from their respective positions as officers of the Company, they, RMR, RMR Australia Asset Management Pty Limited, or RMR Australia, GOV, SIR and AIC have ceased to be related persons of the Company. Therefore, we only present related person transactions with these entities through June 30, 2014.

On December 19, 2013, we and RMR entered into an amended and restated business management agreement, effective with respect to services performed on and after January 1, 2014. Under the terms of this amended and restated business management agreement:

• The annual amount of the base management fee which was to be paid to RMR by us for each applicable period was to be equal to the lesser of:

• the sum of (a) 0.7% of the average historical cost of our real estate investments during such period up to $250.0 million, plus (b) 1.0% of the average historical cost of our real estate investments located outside the United States, Puerto Rico and Canada during such period, plus (c) 0.5% of the average historical cost of our real estate investments during such period exceeding $250.0 million and the average historical cost of our real estate investments located outside the United States, Puerto Rico and Canada combined; and

• the sum of (a) 0.7% of the average closing price per share of our common shares on the NYSE, during such period, multiplied by the average number of our common shares outstanding during such period, plus the daily weighted average of the aggregate liquidation preference of each class of our preferred shares outstanding during such period, plus the daily weighted average of the aggregate principal amount of our consolidated

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indebtedness during such period, or, together, our Average Market Capitalization, up to $250.0 million, plus (b) 1.0% of the average historical cost of our real estate investments located outside the United States, Puerto Rico and Canada during such period, plus (c) 0.5% of our Average Market Capitalization exceeding $250.0 million and the average historical cost of our real estate investments located outside the United States, Puerto Rico and Canada during such period combined.

The average historical cost of our real estate investments will include our consolidated assets invested, directly or indirectly, in equity interests in or loans secured by real estate and personal property owned in connection with such real estate (including acquisition related costs and costs which may be allocated to intangibles or are unallocated), all before reserves for depreciation, amortization, impairment charges or bad debts or other similar noncash reserves. Our investment in SIR (or in any other company which has a management agreement with RMR) is not counted for purposes of calculating the fees payable by us to RMR.

• Although the fee calculation is stated in annual percentages, the base management fee is paid monthly to RMR, ninety percent (90%) in cash and ten percent (10%) in our common shares, which shall be fully-vested when issued. The number of our common shares to be issued in payment of the base management fee for each month is equal to the value of 10.0% of the total base management fee for that month divided by the average daily closing price of our common shares during that month.

• The incentive management fee which may be earned by RMR for an annual period will be an amount, subject to a cap based on the value of our outstanding common shares, equal to 12.0% of the product of (a) our equity market capitalization on the last trading day on the year immediately prior to the relevant measurement period, and (b) the amount (expressed as a percentage) by which the total returns per share realized by the holders of our common shares (i.e., share price appreciation plus dividends) exceeds the total shareholder return of the SNL Office REIT Index (in each case subject to certain adjustments) for the relevant measurement period. The measurement periods are generally three-year periods ending with the year for which the incentive management fee is being calculated, with shorter periods applicable in the case of the calculation of the incentive management fee for 2014 (one year) and 2015 (two years).

• The incentive management fee is payable in our common shares, with one-third of our common shares issued in payment of an incentive management fee vested on the date of issuance, and the remaining two-thirds vesting thereafter in two equal annual installments. If the issuance of common shares in payment of a portion of the base management fee or incentive management fee would be limited by applicable law and regulations, such portion of the applicable fee will instead be paid in cash.

• RMR and certain eligible transferees of our common shares issued in payment of the base management fee or incentive management fee are entitled to demand registration rights, exercisable not more frequently than twice per year, and to "piggy-back" registration rights, with certain expenses to be paid by us. We and applicable selling shareholders also have agreed to indemnify each other (and their officers, trustees, directors and controlling persons) against certain liabilities, including liabilities under the Securities Act in connection with any such registration.

Pursuant to our business management agreement with RMR as described above, we recognized business management fee expense of $31.7 million for the six months ended June 30, 2014. The fees for the six months ended June 30, 2014, include estimated 2014 incentive fees payable in common shares based on our common share total return. These amounts are included in general and administrative expenses, in our consolidated financial statements. In accordance with the terms of our business management agreement, as amended in December 2013, we issued 68,206 of our common shares to RMR for the six months ended June 30, 2014 as payment for 10% of the base business management fee we recognized for such period.

For 2013, our business management agreement provided for the base business management fee to be paid to RMR at an annual rate equal to (a) 0.7% of the historical cost of our real estate investments, as described in the business management agreement, located in the United States, Puerto Rico or Canada, for the first $250.0 million of such investments, and 0.5% thereafter, plus (b) 1.0% of the historical cost of our real estate investments located outside the United States, Puerto Rico and Canada. In addition, for 2013, our business management agreement provided for RMR to be paid an incentive fee equal to 15.0% of the product of (i) the weighted average of our common shares outstanding on a fully diluted basis during a fiscal year and (ii) the excess, if any, of the FFO Per Share, as defined in the business management agreement, for such fiscal year over the FFO Per Share for the preceding fiscal year. Our investments in GOV and SIR, which are described below, were not counted for purposes of determining the business management fees payable by us to RMR; however, we reported the business management fees payable to RMR by SIR in our consolidated 2013 results until we deconsolidated our investment in SIR on July 2, 2013.

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The business management fees, we and SIR (while SIR was a consolidated subsidiary of ours) recognized on a consolidated basis were $43.3 million for 2013. This amount is included in general and administrative expenses and income from discontinued operations, as appropriate, in our consolidated financial statements. No incentive fees were paid by us to RMR for 2013.

Our property management agreement with RMR provided for management fees equal to 3.0% of gross collected rents and construction supervision fees for construction equal to 5.0% of construction costs. The aggregate property management and construction supervision fees we and SIR (while SIR was a consolidated subsidiary of ours) recognized on a consolidated basis were $13.8 million for the six months ended June 30, 2014, and $32.5 million for 2013. These amounts are included in operating expenses and income from discontinued operations or have been capitalized, as appropriate, in our consolidated financial statements.

MacarthurCook Fund Management Limited (MacarthurCook) previously provided us with business and property management services related to our Australian properties. Our contract with MacarthurCook terminated on January 31, 2013, and on that date we entered into a business and property management agreement (Australia Management Agreement) with RMR Australia for the benefit of CWH Australia Trust, a subsidiary of ours (CWHAT). RMR Australia is owned by two of our former Trustees and our former President and it has been granted an Australian financial services license by the Australian Securities & Investments Commission. The Australia Management Agreement provides for compensation to RMR Australia for business management and real estate investment services at an annual rate equal to 0.5% of the average historical cost of CWHAT's real estate investments, as described in the Australia Management Agreement. The Australia Management Agreement also provides for additional compensation to RMR Australia (i) for property management services at an annual rate equal to 50% of the difference between 3.0% of collected gross rents and the aggregate of all amounts paid or payable by or on behalf of CWHAT to third party property managers, and (ii) for construction supervision services at an annual rate equal to 50% of the difference between 5.0% of constructions costs and any amounts paid to third parties for construction management and/or supervision. Similar to our prior arrangement with respect to fees we paid to MacarthurCook, RMR has agreed to waive half of the fees payable by us under our property management agreement with RMR and half of the business management fees otherwise payable by us under our business management agreement with RMR related to real estate investments that are subject to the Australia Management Agreement for so long as the Australia Management Agreement is in effect and we or any of our subsidiaries are paying the fees under that agreement. The aggregate business and property management fees we recognized pursuant to the Australia Management Agreement were $0.9 million for the six months ended June 30, 2014, which amounts are equal to the fees waived by RMR and excluded from the amount that was payable to RMR during the six months ended June 30, 2014.  Pursuant to the Australia Management Agreement, we recognized aggregate business and property management fees of $1.6 million for the year ended December 31, 2013, which amount is equal to the fees waived by RMR and excluded from the amounts that were payable to RMR during 2013.

For January 2013, with respect to our investments in Australia, RMR agreed to waive half of the fees payable by us under our property management agreement and half of the business management fees related to real estate investments located outside of the United States, Puerto Rico and Canada, so long as our business and property management agreement with MacarthurCook, with respect to those investments, was in effect and we or any of our subsidiaries were paying fees under that agreement. MacarthurCook earned $0.2 million in January 2013, with respect to our Australian properties, which amounts are equal to the fees waived by RMR and excluded from the amounts that were payable to RMR during those periods.

RMR also provided internal audit services to us in return for our share of the total internal audit costs incurred by RMR for us and other publicly owned companies managed by RMR and its affiliates, which amounts were subject to approval by our former Compensation Committee. Our former Audit Committee appointed our Director of Internal Audit. Our and SIR's (while SIR was a consolidated subsidiary of ours) share of RMR's costs of providing this internal audit function was, on a consolidated basis, approximately $0.3 million for 2013, which amounts are included in general and administrative expenses in our consolidated financial statements. These allocated costs are in addition to the business and property management fees we and SIR paid to RMR.

RMR also leased from us office space for eleven of its regional offices. We earned approximately $0.4 million for the six months ended June 30, 2014 and $0.8 million in rental income from RMR in 2013, with respect to approximately 36,500 square feet of office space, which we believe was commercially reasonable rent for this office space, not all of which was leased to RMR for the entire three-year period. These leases were terminated when our management agreements with RMR terminated.

Under our share award plans, we granted restricted shares to certain employees of RMR, some of whom are our former officers. We granted a total of 73,450 restricted shares with an aggregate value of $1.7 million to such persons in 2013, based

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EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

on upon the closing price of our common shares on the NYSE on the dates of grants. One fifth of those restricted shares vested on the grant dates and one fifth vests on each of the next four anniversaries of the grant dates. These share grants to RMR employees were in addition to the fees we pay to RMR. On occasion, we have entered into arrangements with former employees of RMR in connection with the termination of their employment with RMR, providing for the acceleration of vesting of restricted shares previously granted to them under our share award plan. Additionally, each of our former President, former Treasurer and former Chief Financial Officer and former Senior Vice President and former Chief Operating Officer received grants of restricted shares of other companies to which RMR provides management services in their capacities as officers of RMR. As a result of the removal of our former Trustees on March 25, 2014, the vesting of common shares previously issued to our former officers and certain employees of RMR pursuant to our equity compensation plans accelerated in accordance with the terms of their governing share grants (Note 14).

Termination and Cooperation Agreement: On September 30, 2014, we entered into a termination and cooperation agreement (Cooperation Agreement) with RMR and RMR Australia (together, Manager). Under the terms of the agreement, the existing business and property management agreements with RMR terminated effective September 30, 2014.

Pursuant to the Cooperation Agreement, through February 28, 2015, Manager agreed to use best efforts to assist us in the transition of our management and operations. We paid Manager $1.2 million per month for transition services from October 1, 2014 to February 28, 2015, which included continued management and other services for the Australian assets pursuant to the Australian Management Agreement. Beginning March 1, 2015, we agreed to pay Manager $0.1 million per month until we no longer required such services or until the Australia Management Agreement was terminated, which was terminated in the third quarter of 2015, effective October 31, 2015. There is no future obligation to pay any fees to Manager.

RMR is responsible for any severance payments to its employees. We paid accrued vacation benefits for any of Manager’s employees that were terminated as a result of the transition and we paid Manager the $15.3 million pro-rata portion of the current year’s incentive fee under the existing business management agreement for the period from January 1, 2014 to September 30, 2014. This incentive fee relates to the business management agreement entered into prior to the election of our new Board of Trustees on May 23, 2014. There is no future obligation to pay an incentive fee to RMR.

GOV:    GOV was formerly our 100% owned subsidiary. In 2009, GOV completed an initial public offering pursuant to which GOV ceased to be a majority owned subsidiary of ours. To facilitate this offering, we and GOV entered into a transaction agreement that governs our separation from and relationship with GOV. Pursuant to this transaction agreement and subject to certain conditions, among other things, we granted GOV the right of first purchase to acquire any property owned by us that we determine to divest (including sale, mortgage or other financing), if the property is then, or is reasonably expected within twelve (12) months to be, majority leased to a government tenant, which right of first purchase will also apply in the event of an indirect sale of any such properties as a result of a change of control of us. On July 23, 2014, we and GOV entered into a letter agreement whereby GOV irrevocably waived and released us from the right of first purchase described above. Additionally, pursuant to the letter agreement we and GOV each agreed to waive certain consent rights over the other party’s investments in certain categories of properties.

During the time we were externally managed by RMR, RMR provided management services to both us and GOV, two of our former Trustees and our former President were managing trustees of GOV and GOV’s executive officers were officers of RMR. On March 15, 2013, we sold all of our 9,950,000 common shares of GOV in a public offering for net proceeds (after deducting underwriters' discounts and commissions and expenses) of $239.6 million and we realized a gain of $66.3 million. In connection with this public offering, on March 11, 2013, we entered into a registration agreement with GOV under which we agreed to pay all expenses incurred by GOV relating to the registration and sale of our GOV common shares. We incurred and paid $0.3 million of reimbursements to GOV pursuant to this agreement during 2013. In addition, under the registration agreement, GOV agreed to indemnify us and our officers, Trustees and controlling persons, and we agreed to indemnify GOV and its officers, trustees and controlling persons, against certain liabilities related to the public offering, including liabilities under the Securities Act of 1933, as amended, (Securities Act).

SIR:  SIR was formerly our 100% owned subsidiary. In March 2012, SIR completed an initial public offering, or the SIR IPO. As of June 30, 2014, we owned 22,000,000 common shares of SIR, which represented approximately 36.7% of SIR’s outstanding common shares. Two of our former Trustees and our former President were managing trustees of SIR and our former Treasurer and Chief Financial Officer served as the treasurer and chief financial officer of SIR and SIR’s executive officers were officers of RMR. In addition, one of our former independent Trustees was an independent trustee of SIR.

F-44

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

In March 2012, SIR completed an initial public offering pursuant to which it issued 9,200,000 of its common shares for net proceeds (after deducting underwriters' discounts and commissions and expenses) of $180.8 million. SIR applied those net proceeds, along with proceeds from drawings under SIR's revolving credit facility, to repay in full a $400.0 million demand promissory note that we received from SIR on February 16, 2012, along with 22,000,000 SIR common shares (including SIR common shares that had been previously issued to us in connection with SIR's formation), in exchange for our transfer to SIR of 79 properties (251 separate buildings or land parcels with a combined approximately 21,400,000 rentable square feet). SIR also reimbursed us for costs that we incurred in connection with SIR's organization and preparation for the SIR IPO.

In March 2013, we entered into a registration agreement with SIR, pursuant to which SIR agreed to, among other things, file a registration statement with respect to an offering of up to all of the 22,000,000 common shares of SIR that we owned, and SIR filed a registration statement on Form S-3 to permit the resale by us of some or all of the common shares of SIR we owned. Under the registration agreement, we agreed to pay all expenses incurred by SIR relating to the registration and sale of the shares in an offering. We incurred and paid $0.6 million of reimbursements to SIR pursuant to this agreement. By letter dated March 31, 2014, SIR notified us that, effective that same day, SIR had elected to terminate the registration agreement with us as a result of the removal of all the former Trustees effective March 25, 2014, which constituted a change of control of us as provided in that agreement. The letter also noted that SIR would welcome the opportunity to meet with our new Board of Trustees to discuss mutually beneficial arrangements regarding the registration of the shares of SIR owned by EQC.  On July 9, 2014, we sold our entire stake of 22,000,000 common shares of SIR, for $32.04 per share, raising aggregate gross proceeds of $704.8 million.  As a result of this sale, we no longer hold any interest in SIR.

AIC:  We previously owned 12.5% of AIC, an Indiana insurance company, and, as of May 9, 2014, had invested $5.2 million in AIC since we became an equity owner of AIC in 2009. RMR, GOV, SIR and four other companies to which RMR provides management services also own shares of AIC. During the time we were externally managed by RMR, RMR provided management and administrative services to AIC pursuant to a management and administrative services agreement with AIC and a majority of the former Trustees, our former President and most of the trustees and directors of the other AIC shareholders served on the board of directors of AIC. On March 25, 2014, as a result of the removal of the former Trustees, we underwent a change in control, as defined in the shareholders’ agreement among us, the other shareholders of AIC and AIC. As a result of that change in control and in accordance with the terms of the shareholders agreement, the other shareholders of AIC, on May 9, 2014, exercised their right to purchase the 20,000 shares of AIC we then owned. We received $5.8 million in aggregate proceeds from this sale and we no longer own any interest in AIC.

We previously purchased property insurance providing $500.0 million of coverage pursuant to an insurance program arranged by AIC and with respect to which AIC was a reinsurer of certain coverage amounts. This program expired in June 2014. We paid AIC a premium, including taxes and fees, of approximately $6.0 million in connection with that policy.

Indemnification:  Pursuant to our declaration of trust and separate indemnification agreements, we have advanced amounts incurred for legal fees and costs on behalf of certain of the former Trustees and officers with respect to the legal proceedings described in Part I, Item 3, “Legal Proceedings” in this Annual Report on Form 10-K. Pursuant to indemnification provisions in our business and property management agreements with RMR, we have also incurred legal fees and costs on behalf of RMR for claims brought against RMR in its capacity as our business and property manager with respect to certain legal proceedings described in Part I, Item 3, “Legal Proceedings” in this Annual Report on Form 10-K. For the six months ended June 30, 2014, we incurred approximately $5.4 million in such legal fees and costs, and for the year ended December 31, 2013, we incurred approximately $30.4 million in such legal fees and costs, including our costs.

Settlement of Certain Tenant Litigation: On March 1, 2014, pursuant to mediation, we and an affiliate of RMR agreed to terms of a settlement of a long running litigation with an unrelated third party that was a tenant, or the Tenant, of two separate properties: one property owned by us and one property owned by the RMR affiliate. This litigation arose as a result of flooding in 1999 and 2001 at both of these properties. After the flooding, the Tenant filed a complaint seeking declaratory and injunctive relief providing that Tenant was no longer obligated to pay rent at the two properties in question and brought claims against EQC and the RMR affiliate, as landlords, for, among other things, breach of the covenants of quiet enjoyment and habitability. We and RMR counterclaimed, seeking damages based in part upon Tenant’s failure to pay rent and make repairs. The settlement agreement regarding this litigation provides for a payment by Tenant of $12.0 million to EQC and the RMR affiliate, payable in three installments ($6.0 million on June 30, 2014 and $3.0 million on each of September 30, 2014 and December 31, 2014), split pro-rata between EQC and the RMR affiliate based upon the balance of the rent due under each lease. The total rent due

F-45

EQUITY COMMONWEALTH

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

under the EQC lease was approximately $9.2 million; the total rent due under the lease with the RMR affiliate was approximately $1.1 million. This settlement was approved by the court on May 6, 2014.

Note 20. Selected Quarterly Financial Data (Unaudited)

The following is a summary of our unaudited quarterly results of operations for 2015 and 2014 (dollars in thousands):

	2015
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Total revenues	$	213,055	$	203,694	$	159,208	$	138,934
Net income attributable to Equity Commonwealth common shareholders	6,649		5,635		23,485		36,164
Net income attributable to Equity Commonwealth common shareholders per share—basic	0.05		0.04		0.18		0.29
Net income attributable to Equity Commonwealth common shareholders per share—diluted	0.05		0.04		0.18		0.28

The decrease in the third and fourth quarter 2015 total revenues and net income attributable to Equity Commonwealth common shareholders was primarily attributable to properties sold in the second, third and fourth quarters of 2015.

	2014
	First Quarter		Second Quarter			Third Quarter		Fourth Quarter
Total revenues	$	217,260	$	215,194		$	216,595	$	212,808
Net income (loss) attributable to Equity Commonwealth common shareholders	9,297		(17,802		)	149,759		(165,542		)
Net income (loss) attributable to Equity Commonwealth common shareholders per share—basic	0.08		(0.14		)	1.16		(1.28		)
Net income (loss) attributable to Equity Commonwealth common shareholders per share—diluted	0.08		(0.14		)	1.16		(1.28		)
Common distributions declared	0.25		—			—		—

The decrease in the second quarter 2014 net loss attributable to Equity Commonwealth common shareholders was primarily attributable to a loss on asset impairment of $22.7 million. The increase in third quarter 2014 net income attributable to Equity Commonwealth common shareholders was largely attributable to the gain on equity investment in SIR of $171.8 million. The decrease in the fourth quarter 2014 net loss attributable to Equity Commonwealth common shareholders was impacted by a loss on asset impairment of $167.1 million.

Note 21.  Subsequent Events

On February 16, 2016, we redeemed at par $139.1 million of our 6.25% senior unsecured notes due 2016.

On February 16, 2016, we sold Executive Park (9 buildings), with 427,443 square feet for $50.9 million.  

From January 1, 2016 through February 16, 2016, share buyback activity has totaled 861,162 common shares at a weighted average price of $25.94 per share.

F-46

EQUITY COMMONWEALTH

SCHEDULE II

VALUATION AND QUALIFYING ACCOUNTS

December 31, 2015

(dollars in thousands)

Description	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions			Balance at End of Period
Year Ended December 31, 2013:
Allowance for doubtful accounts	$	9,962	$	818	$	(2,895	)	$	7,885
Year Ended December 31, 2014:
Allowance for doubtful accounts	$	7,885	$	2,196	$	(3,516	)	$	6,565
Year Ended December 31, 2015:
Allowance for doubtful accounts	$	6,565	$	4,533	$	(3,383	)	$	7,715

S-1

EQUITY COMMONWEALTH

SCHEDULE III

REAL ESTATE AND ACCUMULATED DEPRECIATION

December 31, 2015

(dollars in thousands)

				Initial Cost to Company						Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)	Land	Buildings and Improvements	Costs Capitalized Subsequent to Acquisition, Net		Impairment/Write Downs		Land	Buildings and Improvements	Total(2)	Accumulated Depreciation(3)	Date Acquired	Original Construction Date
785 Schilinger Road South	Mobile	AL	—	1,540	9,732	(3	)	—		1,540	9,729	11,269	1,990	10/22/2007	1998
Parkshore Plaza	Folsom	CA	41,275	4,370	41,749	3,063		(3	)	4,370	44,809	49,179	5,086	6/16/2011	1999
Leased Land	Gonzalez	CA	—	18,941	9,060	3,967		—		18,940	13,028	31,968	2,862	8/31/2010	-
Sky Park Centre	San Diego	CA	—	936	8,094	756		—		936	8,850	9,786	3,308	6/24/2002	1986
9110 East Nichols Avenue	Centennial	CO	—	1,708	14,616	4,002		—		1,708	18,618	20,326	6,438	11/2/2001	1984
1225 Seventeenth Street	Denver	CO	—	22,400	110,090	17,269		—		22,400	127,359	149,759	21,595	6/24/2009	1982
5073, 5075, & 5085 S. Syracuse Street	Denver	CO	—	4,720	58,890	—		—		4,720	58,890	63,610	8,343	4/16/2010	2007
1601 Dry Creek Drive	Longmont	CO	—	3,714	24,397	5,535		—		3,715	29,931	33,646	9,165	10/26/2004	1982
97 Newberry Road	East Windsor	CT	6,375	2,960	12,360	30		—		2,943	12,407	15,350	2,865	10/24/2006	1989
33 Stiles Lane	North Haven	CT	2,785	2,090	9,141	216		(1,654	)	1,799	7,994	9,793	2,161	10/24/2006	1970
1250 H Street, NW	Washington	DC	—	5,975	53,778	10,947		(2	)	5,975	64,723	70,698	26,030	6/23/1998	1992
Georgetown-Green and Harris Buildings	Washington	DC	—	24,000	35,979	44		—		24,000	36,023	60,023	5,700	9/3/2009	1960;1975
802 Delaware Avenue	Wilmington	DE	—	4,409	39,681	10,533		(11,156	)	3,390	40,077	43,467	23,091	7/23/1998	1986
6600 North Military Trail	Boca Raton	FL	—	15,900	129,790	123		—		15,900	129,913	145,813	16,224	1/11/2011	2008
Executive Park	Atlanta	GA	—	13,729	78,032	6,776		(54,313	)	10,954	33,270	44,224	14,859	7/16/2004; 7/26/2007	1972
633 Ahua Street	Honolulu	HI	—	1,256	3	18,054		(2,912	)	1,100	15,301	16,401	3,765	12/5/2003	2006
625 Crane Street	Aurora	IL	—	1,180	3,411	(2	)	(2,978	)	533	1,078	1,611	87	4/2/2007	1977
1200 Lakeside Drive	Bannockburn	IL	—	5,846	48,568	14,768		(7,610	)	5,858	55,714	61,572	12,601	12/29/2005	1999
600 West Chicago Avenue	Chicago	IL	—	34,980	315,643	12,058		—		34,980	327,701	362,681	35,679	8/10/2011	1908
8750 Bryn Mawr Avenue	Chicago	IL	—	6,600	77,764	7,400		(170	)	6,600	84,994	91,594	11,705	10/28/2010	1985
101-115 W. Washington Street	Indianapolis	IN	—	7,495	60,465	23,210		—		7,496	83,674	91,170	23,976	5/10/2005	1977
111 Monument Circle	Indianapolis	IN	—	9,670	158,085	8,556		—		9,670	166,641	176,311	13,115	10/22/2012	1959;1990
109 Brookline Avenue	Boston	MA	—	3,168	30,397	12,684		—		3,168	43,081	46,249	18,718	9/28/1995	1915
Cabot Business Park Land	Mansfield	MA	—	1,033	—	—		—		1,033	—	1,033	—	8/1/2003	-
111 Market Place	Baltimore	MD	—	6,328	54,645	16,152		—		6,328	70,797	77,125	24,753	1/28/2003	1990
25 S. Charles Street	Baltimore	MD	—	2,830	22,996	12,678		—		2,830	35,674	38,504	12,479	7/16/2004	1972
820 W. Diamond	Gaithersburg	MD	—	4,381	18,798	10,538		(35	)	4,461	29,221	33,682	11,487	3/31/1997	1995
Danac Stiles Business Park	Rockville	MD	—	7,638	62,572	6,329		(10,975	)	6,595	58,969	65,564	18,984	7/20/2004	2002

S-2

EQUITY COMMONWEALTH

SCHEDULE III

REAL ESTATE AND ACCUMULATED DEPRECIATION

December 31, 2015

(dollars in thousands)

				Initial Cost to Company						Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)	Land	Buildings and Improvements	Costs Capitalized Subsequent to Acquisition, Net		Impairment/Write Downs		Land	Buildings and Improvements	Total(2)	Accumulated Depreciation(3)	Date Acquired	Original Construction Date
East Eisenhower Parkway	Ann Arbor	MI	—	6,760	46,988	1,513		—		6,760	48,501	55,261	6,836	6/15/2010	1975;2006
2250 Pilot Knob Road	Mendota Heights	MN	—	533	4,795	1,202		—		533	5,997	6,530	2,643	3/19/1998	1995
411 Farwell Avenue	South St. Paul	MN	—	1,303	10,451	4,603		—		1,304	15,053	16,357	3,526	6/2/2004	1970
6200 Glenn Carlson Drive	St. Cloud	MN	—	1,950	13,803	—		—		1,950	13,803	15,753	2,156	10/15/2009	1999
4700 Belleview Avenue	Kansas City	MO	—	1,165	3,097	2,895		—		1,165	5,992	7,157	1,029	7/17/2008	1986
111 River Street (4)	Hoboken	NJ	—	—	134,199	1,871		—		—	136,070	136,070	21,630	8/11/2009	2002
North Point Office Complex	Cleveland	OH	—	12,000	94,448	18,136		—		12,000	112,584	124,584	22,363	2/12/2008	1985;1989;1990
Raintree Industrial Park	Solon	OH	—	1,808	16,620	2,270		(8,387	)	1,339	10,972	12,311	858	7/16/2004	1975
401 Vine Street	Delmont	PA	—	1,575	5,542	—		—		1,575	5,542	7,117	1,130	10/22/2007	1999
Cherrington Corporate Center	Moon Township	PA	—	11,369	39,892	28,367		(5,454	)	11,164	63,010	74,174	21,480	9/14/1998; 8/23/1999	1987;1988; 1989;1990; 1991;1992; 1994
1500 Market Street	Philadelphia	PA	—	18,758	167,487	104,542		(388	)	18,758	271,641	290,399	78,551	10/10/2002	1974
1525 Locust Street	Philadelphia	PA	—	931	8,377	1,902		—		930	10,280	11,210	4,122	6/11/1999	1987
1600 Market Street	Philadelphia	PA	—	3,462	111,946	18,259		—		3,462	130,205	133,667	55,534	3/30/1998	1983
1735 Market Street	Philadelphia	PA	169,612	24,753	222,775	52,107		—		24,747	274,888	299,635	121,238	6/30/1998	1990
Foster Plaza	Pittsburgh	PA	—	6,168	51,588	17,969		—		6,171	69,554	75,725	19,771	9/16/2005	1987;1990; 1994; 1995; 1996
128 Crews Drive	Columbia	SC	—	2,420	4,017	1,322		(4,012	)	1,024	2,723	3,747	489	4/2/2007	1968
111 Southchase Boulevard	Fountain Inn	SC	—	520	6,822	1,734		(2,912	)	390	5,774	6,164	1,531	5/23/2007	1987
1043 Global Avenue	Graniteville	SC	—	720	15,552	603		—		720	16,155	16,875	3,537	4/2/2007	1998
633 Frazier Drive	Franklin	TN	—	5,800	13,190	(10	)	—		5,800	13,180	18,980	2,711	10/22/2007	1999
1601 Rio Grande Street	Austin	TX	—	688	6,192	1,539		(23	)	697	7,699	8,396	3,106	6/3/1999	1985
206 East 9th Street	Austin	TX	27,515	7,900	38,533	2,166		—		7,900	40,699	48,599	3,702	5/31/2012	1984
4515 Seton Center Parkway	Austin	TX	—	2,038	18,338	2,731		—		2,037	21,070	23,107	9,110	10/8/1999	1997
4516 Seton Center Parkway	Austin	TX	—	2,028	18,251	3,022		—		2,027	21,274	23,301	9,681	10/8/1999	1985
7800 Shoal Creek Boulevard	Austin	TX	—	1,731	14,921	4,614		(14	)	1,731	19,521	21,252	7,672	6/30/1999	1974
812 San Antonio Street	Austin	TX	—	626	5,636	2,564		—		621	8,205	8,826	3,115	8/18/1999	1987
8701 N Mopac	Austin	TX	—	1,574	14,168	2,677		—		1,573	16,846	18,419	6,751	8/3/1999	1982
Bridgepoint Parkway	Austin	TX	—	7,784	70,526	10,214		(97	)	7,785	80,642	88,427	37,559	12/5/1997	1986;1996;1997

S-3

EQUITY COMMONWEALTH

SCHEDULE III

REAL ESTATE AND ACCUMULATED DEPRECIATION

December 31, 2015

(dollars in thousands)

					Initial Cost to Company										Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)		Land		Buildings and Improvements		Costs Capitalized Subsequent to Acquisition, Net			Impairment/Write Downs			Land		Buildings and Improvements		Total(2)		Accumulated Depreciation(3)		Date Acquired	Original Construction Date
Lakewood on the Park	Austin	TX	—		3,548		31,936		1,704			(77		)	3,548		33,563		37,111		14,554		10/20/1998	1998
Research Park	Austin	TX	—		15,859		60,175		14,601			—			18,411		72,224		90,635		29,564		10/7/1998	1968;1998; 2001
9840 Gateway Boulevard North	El Paso	TX	—		1,700		9,736		(4		)	—			1,700		9,732		11,432		1,996		10/22/2007	1999
3003 South Expressway 281	Hidalgo	TX	—		1,480		15,533		(9		)	—			1,480		15,524		17,004		3,193		10/22/2007	1999
3330 N Washington Boulevard	Arlington	VA	—		810		7,289		724			—			811		8,012		8,823		3,304		8/26/1998	1987
333 108th Avenue NE	Bellevue	WA	—		14,400		136,412		1,745			—			14,400		138,157		152,557		22,060		11/12/2009	2008
600 108th Avenue NE	Bellevue	WA	—		3,555		30,244		14,252			—			3,555		44,496		48,051		11,904		7/16/2004	1980
1331 North Center Parkway	Kennewick	WA	—		1,850		7,339		(2		)	—			1,850		7,337		9,187		1,506		10/22/2007	1999
100 East Wisconsin Avenue	Milwaukee	WI	—		3,150		72,113		7,733			—			3,150		79,846		82,996		11,433		8/11/2010	1989
111 East Kilbourn Avenue	Milwaukee	WI	—		2,400		47,562		5,143			—			2,400		52,705		55,105		10,528		6/12/2008	1988
			$	247,562	$	394,913	$	3,065,229	$	540,382		$	(113,172	)	$	389,410	$	3,497,942	$	3,887,352	$	898,939

S-4

EQUITY COMMONWEALTH

SCHEDULE III

REAL ESTATE AND ACCUMULATED DEPRECIATION

December 31, 2015

(dollars in thousands)

Analysis of the carrying amount of real estate properties and accumulated depreciation:

	Real Estate Properties			Accumulated Depreciation
Balance at January 1, 2013	$	7,829,409		$	1,007,606
Additions(5)	231,485			176,777
Loss on asset impairment	(384,141		)	(185,795		)
Deconsolidation of SIR	(1,446,781		)	(56,023		)
Properties reclassified to discontinued operations	(552,024		)	(15,471		)
Disposals	(140,783		)	(32,035		)
Balance at December 31, 2013	5,537,165			895,059
Additions(5)	70,963			164,815
Loss on asset impairment	(191,490		)	(6,423		)
Properties reclassified to continuing operations	341,024			5,724
Disposals	(29,219		)	(28,730		)
Balance at December 31, 2014	5,728,443			1,030,445
Additions(5)	68,118			144,844
Loss on asset impairment	(17,162		)	—
Disposals	(1,892,047		)	(276,350		)
Balance at December 31, 2015	$	3,887,352		$	898,939

(1) Excludes net unamortized premiums and discounts.

(2) Excludes value of real estate intangibles. Aggregate cost for federal income tax purposes is approximately $4,160,805.

(3) Depreciation is calculated using the straight line method over estimated useful lives of up to 40 years for buildings and improvements and up to 12 years for personal property.

(4) Property is subject to a ground lease.

(5) Includes adjustments to real estate properties additions of $(13,217), $(20,445) and $(40,020), and adjustments to accumulated depreciation additions of $(887), $(1,279) and $(1,528), related to changes in foreign currency exchange rates during 2015, 2014 and 2013, respectively.

S-5

EQUITY COMMONWEALTH

SCHEDULE IV

MORTGAGE LOANS ON REAL ESTATE

December 31, 2015

(dollars in thousands)

Location	Interest Rate	Final Maturity Date	Periodic Payment Terms	Face Amount of Mortgage(1)			Carrying Amount of Mortgage		Principal Amount of Loans Subject to Delinquent Principal or Interest
Salina, NY	6.00%	4/30/2019	Interest payable monthly in arrears. $419 due at maturity.	$	419		399		$	—
Dearborn, MI	6.00%	1/24/2023	Interest payable monthly in arrears. $7,688 due at maturity.	7,688			7,688		—
				$	8,107		$	8,087	$	—
Reconciliation of the carrying amount of mortgage loans at the beginning of the period:
Balance at January 1, 2013				$	1,419
New mortgage loans				7,688
Collections of principal				(1,000		)
Balance at December 31, 2013				$	8,107
Balance at December 31, 2014				$	8,107
Balance at December 31, 2015				$	8,107

(1) Also represents cost for federal income tax purposes.

S-6

SIGNATURES

Pursuant to the requirements of Section 13 and 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. 

EQUITY COMMONWEALTH
By:	/s/ David A. Helfand
	David A. Helfand
	President and Chief Executive Officer
	Dated: February 18, 2016

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant, in the capacities and on the dates indicated.

Signature	Title	Date
/s/ David A. Helfand	President and Chief Executive Officer (principal executive officer), Trustee	February 18, 2016
David A. Helfand
/s/ Adam S. Markman	Executive Vice President, Chief Financial Officer and Treasurer (principal financial officer)	February 18, 2016
Adam S. Markman
/s/ Sam Zell	Chairman of the Board of Trustees	February 18, 2016
Sam Zell
/s/ James S. Corl	Trustee	February 18, 2016
James S. Corl
/s/ Martin L. Edelman	Trustee	February 18, 2016
Martin L. Edelman
/s/ Edward A. Glickman	Trustee	February 18, 2016
Edward A. Glickman
/s/ Peter Linneman	Trustee	February 18, 2016
Peter Linneman
/s/ James L. Lozier, Jr.	Trustee	February 18, 2016
James L. Lozier, Jr.
/s/ Mary Jane Robertson	Trustee	February 18, 2016
Mary Jane Robertson
/s/ Kenneth Shea	Trustee	February 18, 2016
Kenneth Shea
/s/ Gerald A. Spector	Trustee	February 18, 2016
Gerald A. Spector
/s/ James A. Star	Trustee	February 18, 2016
James A. Star

EX-10.4

Exhibit 10.4

Amendment No. 1

To The

Equity Commonwealth 2015 Omnibus Incentive Plan

Pursuant to Section 5.2 of the Equity Commonwealth 2015 Omnibus Incentive Plan (the “Plan”), the Board of Directors of Equity Commonwealth (the “Board”), at a meeting of the Board held on January 26, 2016, has duly adopted a resolution approving this Amendment No. 1 to the Plan (this “Amendment”) to amend the Plan as set forth below. Unless otherwise defined herein, capitalized terms used in this Amendment shall have the meaning given to them in the Plan.

1. Section 10.2. The last sentence of Section 10.2 of the Plan is hereby amended to read in its entirety as follows:

Except as provided in Section 10.9, Awards of Restricted Stock and Stock Units may not be sold, transferred, assigned, pledged or otherwise encumbered or disposed of during the Restricted Period or prior to the satisfaction of any other restrictions prescribed by the Committee with respect to such Awards.

2. Section 10. The following provision shall be added to the Plan immediately following Section 10.8 of the Plan:

10.9Family Transfers.

If authorized in the applicable Award Agreement and by the Committee, in its sole discretion, a Grantee may transfer, not for value, all or part of an Award of Restricted Stock or Stock Units to any Family Member. For the purpose of this Section 10.9, a transfer “not for value” is a transfer which is (a) a gift, (b) a transfer under a domestic relations order in settlement of marital property rights or (c) unless Applicable Laws do not permit such transfer, a transfer to an entity in which more than fifty percent (50%) of the voting interests are owned by Family Members (and/or the Grantee) in exchange for an interest in such entity. Following a transfer under this Section 10.9, any such Award of Restricted Stock or Stock Units shall continue to be subject to the same terms and conditions as were applicable immediately prior to such transfer, and the shares of Stock acquired pursuant to such Award of Restricted Stock or Stock Units shall be subject to the same restrictions with respect to transfers of such shares of Stock as would have applied to the Grantee thereof. Subsequent transfers of transferred Awards of Restricted Stock or Stock Units shall be prohibited except to Family Members of the original Grantee in accordance with this Section 10.9 or by will or the laws of descent and distribution. The provisions of Section 10.6 relating to termination of Service shall

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continue to be applied with respect to the original Grantee of the Award of Restricted Stock or Stock Units.

3. Section 11. The following provision shall be added to the Plan immediately following Section 11.3 of the Plan:

11.4 Family Transfers

If authorized in the applicable Award Agreement and by the Committee, in its sole discretion, a Grantee may transfer, not for value, all or part of an Award of OP Units to any Family Member. For the purpose of this Section 11.4, a transfer “not for value” is a transfer which is (a) a gift, (b) a transfer under a domestic relations order in settlement of marital property rights or (c) unless Applicable Laws do not permit such transfer, a transfer to an entity in which more than fifty percent (50%) of the voting interests are owned by Family Members (and/or the Grantee) in exchange for an interest in such entity. Following a transfer under this Section 11.4, any such Award of OP Units shall continue to be subject to the same terms and conditions as were applicable immediately prior to such transfer, and the shares of Stock acquired pursuant to such Award of OP Units shall be subject to the same restrictions with respect to transfers of such shares of Stock as would have applied to the Grantee thereof. Subsequent transfers of transferred Awards of OP Units shall be prohibited except to Family Members of the original Grantee in accordance with this Section 11.4 or by will or the laws of descent and distribution.

4. This Amendment shall be and is hereby incorporated into and forms a part of the Plan.

5. Except as modified by the Amendment, the terms of the Plan remain unmodified and in full force and effect.

IN WITNESS WHEREOF, this Amendment is made effective as of June 16, 2015.

EQUITY COMMONWEALTH

By:	/s/ Adam Markman
	Adam Markman
	Executive Vice President, CFO and Treasurer

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EX-10.5

Exhibit 10.5

EQUITY COMMONWEALTH

RESTRICTED STOCK AGREEMENT FOR EMPLOYEES

This Restricted Stock Agreement (this “Agreement”) is made effective as of «DATE», between the recipient set forth on the Schedule to Restricted Stock Agreement attached hereto (the “Recipient”) and Equity Commonwealth (the “Company”).

In consideration of the mutual promises and covenants contained in this Agreement, and for other valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1.Grant of Restricted Stock. Subject to the terms and conditions hereinafter set forth and the terms and conditions of the Equity Commonwealth 2015 Omnibus Incentive Plan, as it may be amended from time to time (the “Plan”), the Company hereby grants to the Recipient, effective as of the date of this Agreement (the “Grant Date”), the number of shares of Stock set forth on the Schedule to Restricted Stock Agreement attached hereto. The shares of Stock so granted are hereinafter referred to as the “Restricted Stock,” which term shall also include any shares of Stock issued to the Recipient by virtue of his or her ownership of the shares of Restricted Stock, by stock dividend, stock split, recapitalization or otherwise. Capitalized terms that are used but not defined herein have the meanings ascribed to them in the Plan.

2.Vesting; Forfeiture.

(a)Subject to Sections 2(b) and 3 hereof, the shares of Restricted Stock shall vest as follows: (i) 25% of the shares of Restricted Stock shall vest on the second anniversary of the Grant Date, (ii) 25% of the shares of Restricted Stock shall vest on the third anniversary of the Grant Date, and (iv) 50% of the shares of Restricted Stock shall vest on the fourth anniversary of the Grant Date. Any shares of Restricted Stock not vested as of any date are herein referred to as “Unvested Stock.”

(b)Subject to Section 3(a) hereof, in the event the Recipient’s employment with the Company and the Affiliates is terminated, all shares of Unvested Stock shall be forfeited by the Recipient as of the date of the Recipient’s termination of employment.

3.Termination of Employment; Change in Control.

(a)If the Recipient’s employment is terminated (i) by the Company or an Affiliate without Cause, (ii) by the Recipient for “Good Reason” (as such term is defined in Section 3(c) hereof), (iii) due to the Recipient’s “Retirement” (as such term is defined in Section 3(c) hereof), or (iv) due to the Recipient’s death or Disability (such termination, a “Qualified Termination”), then the shares of Restricted Stock shall become vested as of the date of the termination of the Recipient’s employment on a pro rata basis, determined based on (x) the number of days that have elapsed from the Grant Date through the date the Recipient ceases to be an employee of the Company or an Affiliate, compared to (y) the total number of days during the period commencing on the Grant Date and ending on the fourth anniversary of the Grant Date. Notwithstanding the foregoing, if the Recipient’s Qualified Termination occurs within twelve (12) months after a Change in Control in which the shares of Restricted Stock are assumed by the acquirer or surviving entity in the Change

in Control transaction, then the shares of Restricted Stock shall become fully vested as of the date of the termination of the Recipient’s employment.

(b)If a Change in Control occurs prior to the fourth anniversary of the Grant Date and while the Recipient is an employee of the Company or an Affiliate, and the shares of Restricted Stock are not assumed by the acquirer or surviving entity in the Change in Control transaction, then the Recipient’s shares of Unvested Stock shall become fully vested as of the date of the Change in Control.

(c)For purposes of this Agreement, the term “Good Reason” shall mean, unless otherwise provided in an applicable agreement between the Recipient and the Company or an Affiliate, the occurrence of one or more of the following without the Recipient’s express written consent, which circumstances are not remedied by the Company within thirty (30) days of its receipt of a written notice from the Recipient describing the applicable circumstances (which notice must be provided by the Recipient within ninety (90) days of the Recipient’s knowledge of the applicable circumstances): (i) any material, adverse change in the Recipient’s duties, responsibilities, authority, title, status or reporting structure; (ii) a material reduction in the Recipient’s base salary or bonus opportunity; or (iii) a geographical relocation of the Recipient’s principal office location by more than fifty (50) miles. For purposes of this Agreement, the term “Retirement” shall mean retirement from active employment with the Company or an Affiliate pursuant to its relevant policy on retirement as determined by the Committee, or, if no such policy is in place, retirement from active employment with the Company or an Affiliate on or after age 65.

4.Transferability of Restricted Stock. Prior to the shares of Restricted Stock becoming vested as set forth in Sections 2 or 3 hereof, the shares of Restricted Stock may not be transferred, pledged, assigned, or otherwise disposed of, except (i) by will or the laws of descent and distribution or (ii) the Recipient may transfer all or part of the shares of Restricted Stock to any Family Member under the terms set forth in Section 10.9 of the Plan, including the requirement that any such transfer be “not for value” (as such term is defined in Section 10.9 of the Plan). Following any such transfer to a Family Member, the provisions of Section 3 hereof relating to termination of employment shall continue to be applied with respect to the original Recipient of the shares of Restricted Stock. Notwithstanding any transfer made by the Recipient pursuant to this Section 4, the Recipient (or the Recipient’s beneficiary or estate, as applicable) shall be responsible for all income and other taxes associated with the shares of Restricted Stock.

5.Legends. Share certificates, if any, evidencing the shares of Restricted Stock shall prominently bear legends in substantially the following terms:

“THE SHARES EVIDENCED BY THIS CERTIFICATE WERE ISSUED PURSUANT TO AN EQUITY COMPENSATION PLAN MAINTAINED BY THE TRUST. THESE SHARES MAY BE SUBJECT TO TRANSFER AND/OR VESTING RESTRICTIONS, AND UNVESTED SHARES ARE SUBJECT TO FORFEITURE CONDITIONS CONTAINED IN THE PLAN, THE RELATED GRANT OF SHARES OR AN AGREEMENT BETWEEN THE TRUST AND THE INITIAL HOLDER OF THESE SHARES. A COPY OF APPLICABLE RESTRICTIONS AND FORFEITURE CONDITIONS WILL BE FURNISHED TO THE HOLDER OF THIS CERTIFICATE WITHOUT CHARGE UPON REQUEST TO THE SECRETARY OF THE TRUST.”

In the event that the shares of Restricted Stock are not evidenced by share certificates, the share books and records of the Company shall contain a notation in substantially the following terms:

“THE SHARES COVERED BY THIS STATEMENT WERE ISSUED PURSUANT TO AN EQUITY COMPENSATION PLAN MAINTAINED BY THE TRUST. THESE SHARES MAY BE SUBJECT TO TRANSFER AND/OR VESTING RESTRICTIONS, AND UNVESTED SHARES ARE SUBJECT TO FORFEITURE CONDITIONS CONTAINED IN THE PLAN, THE RELATED GRANT OF SHARES OR AN AGREEMENT BETWEEN THE TRUST AND THE INITIAL HOLDER OF THESE SHARES. A COPY OF APPLICABLE RESTRICTIONS AND FORFEITURE CONDITIONS WILL BE FURNISHED TO THE HOLDER OF THE SHARES COVERED BY THIS STATEMENT WITHOUT CHARGE UPON REQUEST TO THE SECRETARY OF THE TRUST.”

Certificates evidencing shares of Restricted Stock and shares of Restricted Stock not evidenced by certificates shall also bear or contain, as applicable, legends and notations as may be required by the Plan or the Company’s declaration of trust, any applicable supplement thereto or bylaws, each as in effect from time to time, or as the Company may otherwise determine appropriate.

Promptly following the request of the Recipient with respect to any shares of Restricted Stock (or any other shares of Stock previously granted to the Recipient) which have become vested, the Company shall take, at its sole cost and expense, all such actions as may be required to permit the Recipient to resell such shares including, without limitation, providing to the Company’s transfer agent certificates of officers of the Company, and opinions of counsel, and taking all such other actions as may be required to remove the legends set forth above with respect to transfer and vesting restrictions from the certificates evidencing such shares and, if applicable, from the share books and records of the Company.

6.Tax Withholding. To the extent required by law, the Company shall withhold or cause to be withheld income and other taxes incurred by the Recipient by reason of a grant of shares of Restricted Stock, and the Recipient agrees that he or she shall upon request of the Company pay to the Company an amount sufficient to satisfy its tax withholding obligations from time to time (including as shares of Restricted Stock become vested) as the Company may request.

7.Miscellaneous.

(a)Amendments. Neither this Agreement nor any provision hereof may be changed or modified except by an agreement in writing executed by the Recipient and the Company; provided, however, that any change or modification that does not adversely affect the rights hereunder of the Recipient, as they may exist immediately prior to the effective date of such change or modification, may be adopted by the Company without an agreement in writing executed by the Recipient, and the Company shall give the Recipient written notice of such change or modification reasonably promptly following the adoption of such change or modification.

(b)Binding Effect of the Agreement. This Agreement shall inure to the benefit of, and be binding upon, the Company, the Recipient and their respective estates, heirs, executors, transferees, successors, assigns and legal representatives.

(c)Provisions Separable. In the event that any of the terms of this Agreement shall be or become or is declared to be illegal or unenforceable by any court or other authority of competent jurisdiction, such terms shall be null and void and shall be deemed deleted from this Agreement, and all the remaining terms of this Agreement shall remain in full force and effect.

(d)Notices. Any notice in connection with this Agreement shall be deemed to have been properly delivered if it is in writing and is delivered by hand or by facsimile or sent by registered certified mail, postage prepaid, to the party addressed as follows, unless another address has been substituted by notice so given:

To the Recipient:    To the Recipient’s address as set forth on the signature page hereof.

To the Company: Equity CommonwealthTwo North Riverside Plaza, Suite 2100Chicago, IL 60606Attn: Secretary

(e)Construction. The headings and subheadings of this Agreement have been inserted for convenience only, and shall not affect the construction of the provisions hereof. All references to sections of this Agreement shall be deemed to refer as well to all subsections which form a part of such section.

(f)No Right to Continued Employment. This Agreement shall not be construed as an agreement by the Company or any Affiliate to employ or otherwise retain in any position the Recipient, nor is the Company or any Affiliate obligated to continue employing or otherwise retaining in any position the Recipient by reason of this Agreement or the grant of shares of Restricted Stock to the Recipient hereunder.

(g)Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original but all of which together will constitute one and the same instrument.

(h)Applicable Law. This Agreement shall be construed and enforced in accordance with the laws of the State of Maryland.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement, or caused this Agreement to be executed under seal, as of the date first above written.

Schedule to Restricted Stock Agreement

(See Attachment)

Company Name            Equity Commonwealth

Recipient Id

Recipient Name

Recipient Address

Grant Type                Restricted Stock Award

Number of Shares

Grant Date                

EX-10.6

Exhibit 10.6

EQUITY COMMONWEALTH

RESTRICTED STOCK UNIT AGREEMENT FOR EMPLOYEES

This Restricted Stock Unit Agreement (this “Agreement”) is made effective as of «DATE», between the recipient set forth on the Schedule to Restricted Stock Unit Agreement attached hereto (the “Recipient”) and Equity Commonwealth (the “Company”).

In consideration of the mutual promises and covenants contained in this Agreement, and for other valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1.Grant of Restricted Stock Units. Subject to the terms and conditions hereinafter set forth and the terms and conditions of the Equity Commonwealth 2015 Omnibus Incentive Plan, as it may be amended from time to time (the “Plan”), the Company hereby grants to the Recipient, effective as of the date of this Agreement, the number of restricted stock units set forth on the Schedule to Restricted Stock Unit Agreement attached hereto (the “RSUs”). Each RSU represents the right to receive one share of Stock, subject to the terms and conditions set forth in this Agreement and the Plan. The number of RSUs that the Recipient actually earns for the Performance Period will be determined by the level of achievement of the Performance Criteria in accordance with Exhibit A attached hereto, and may be higher or lower than the number of RSUs granted to the Recipient. Capitalized terms that are used but not defined herein have the meanings ascribed to them in the Plan.

2.Performance Period. For purposes of this Agreement, the term “Performance Period” shall be the period commencing on «Commencement Date» and ending on «Third Anniversary of Commencement Date».

3.Performance Criteria.

(a)The number of RSUs earned by the Recipient for the Performance Period (the “Earned RSUs”) shall be determined at the end of the Performance Period based on the level of achievement of the Performance Criteria in accordance with Exhibit A. All determinations of whether and to what extent the Performance Criteria has been achieved, the number of RSUs earned by the Recipient, and all other matters related to this Section 3 shall be made by the Committee in its sole discretion. Any RSUs that do not become Earned RSUs at the end of the Performance Period, as determined by the Committee in its sole discretion, shall be immediately forfeited by the Recipient.

(b)Following the completion of the Performance Period, the Committee shall determine (i) whether, and to what extent, the Performance Criteria has been achieved, and (ii) the number of RSUs that shall be deemed Earned RSUs, if any. Such determination shall be final, conclusive and binding on the Recipient, and on all other persons, to the maximum extent permitted by law.

4.Vesting; Forfeiture.

(a)50% of the Earned RSUs shall vest on the date that the Committee determines the achievement of the Performance Criteria in accordance with Section 3(a) hereof, subject to the Recipient’s continued employment with the Company or an Affiliate through such date.

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(b)50% of the Earned RSUs shall vest on «Fourth Anniversary of Commencement Date», subject to the Recipient’s continued employment with the Company or an Affiliate through such date.

(c)Subject to Section 5 hereof, in the event the Recipient’s employment with the Company and the Affiliates is terminated, all unvested RSUs shall be forfeited by the Recipient as of the date of the Recipient’s termination of employment.

5.Termination of Employment; Change in Control.

(a)If, during the Performance Period, the Recipient’s employment is terminated (i) by the Company or an Affiliate without Cause, (ii) by the Recipient for “Good Reason” (as such term is defined in Section 5(c) hereof), (iii) due to the Recipient’s “Retirement” (as such term is defined in Section 5(c) hereof), or (iv) due to the Recipient’s death or Disability (such termination, a “Qualified Termination”), then the number of RSUs that are earned by the Recipient shall be determined at the end of the Performance Period in accordance with Section 3 hereof, and the Recipient’s Earned RSUs, if any, shall become vested as of the date that the Committee determines the achievement of the Performance Criteria in accordance with Section 3(a) hereof on a pro rata basis, determined based on (x) the number of days that have elapsed from the beginning of the Performance Period through the date the Recipient ceases to be an employee of the Company or an Affiliate, compared to (y) the total number of days during the period commencing on «Commencement Date» and ending on «Fourth Anniversary of Commencement Date». Notwithstanding the foregoing, if the Recipient’s Qualified Termination occurs during the Performance Period and within twelve (12) months after a Change in Control in which the RSUs are assumed by the acquirer or surviving entity in the Change in Control transaction, then any such Earned RSUs shall become fully vested as of the date that the Committee determines the achievement of the Performance Criteria in accordance with Section 3(a) hereof. With respect to Earned RSUs held by the Recipient for which the Performance Period is complete but for which the additional vesting period is incomplete prior to the Recipient’s Qualified Termination, any restrictions on the Earned RSUs shall lapse and such Earned RSUs shall automatically become fully vested as of the date of the termination of the Recipient’s employment.

(b)If, during the Performance Period, a Change in Control occurs while the Recipient is an employee of the Company or an Affiliate, and the RSUs are not assumed by the acquirer or surviving entity in the Change in Control transaction, then the Recipient’s RSUs shall be deemed earned based on the actual level of achievement of the Performance Criteria measured as of the date of the Change in Control, as determined by the Committee based on a then forty (40) day trailing average price per share of Stock. Any such Earned RSUs shall be fully vested. With respect to Earned RSUs held by the Recipient for which the Performance Period is complete but for which the additional vesting period is incomplete, any restrictions on the Earned RSUs shall lapse and such Earned RSUs shall automatically become fully vested as of the date of the Change in Control. As of the date of the Change in Control, the Company shall cause one share of Stock to be issued to the Recipient for each such Earned RSU that fully vests, less applicable withholding taxes pursuant to Section 9 hereof. Notwithstanding the foregoing, to the extent necessary for the Recipient to avoid taxes and/or penalties under Section 409A of the Code, a Change in Control shall not be deemed to occur unless it constitutes a “change in control event” within the meaning of Section 1.409A-3(i)(5) of the Treasury Regulations promulgated under Section 409A of the Code.

(c)For purposes of this Agreement, the term “Good Reason” shall mean, unless otherwise provided in an applicable agreement between the Recipient and the Company or an Affiliate, the occurrence of one or more of the following without the Recipient’s express written

2

consent, which circumstances are not remedied by the Company within thirty (30) days of its receipt of a written notice from the Recipient describing the applicable circumstances (which notice must be provided by the Recipient within ninety (90) days of the Recipient’s knowledge of the applicable circumstances): (i) any material, adverse change in the Recipient’s duties, responsibilities, authority, title, status or reporting structure; (ii) a material reduction in the Recipient’s base salary or bonus opportunity; or (iii) a geographical relocation of the Recipient’s principal office location by more than fifty (50) miles. For purposes of this Agreement, the term “Retirement” shall mean retirement from active employment with the Company or an Affiliate pursuant to its relevant policy on retirement as determined by the Committee, or, if no such policy is in place, retirement from active employment with the Company or an Affiliate on or after age 65.

6.Settlement of RSUs. Except as provided in Section 5(b) hereof, as soon as practicable following the applicable vesting date of any Earned RSUs held by the Recipient, but in no event later than 60 days after such vesting date, the Company shall cause one share of Stock to be issued to the Recipient for each such Earned RSU, less applicable withholding taxes pursuant to Section 9 hereof. The Company shall cause such shares of Stock (less any shares withheld to pay taxes) to be delivered, either by book-entry registration or in the form of a stock certificate or certificates, registered in the Recipient’s name or in the names of the Recipient’s legal representatives, beneficiaries or heirs, as the case may be. Notwithstanding the foregoing, in the event any settlement of the RSUs hereunder constitutes “deferred compensation” within the meaning of Section 409A of the Code, and the Recipient is a “specified employee” (as determined under the Company's policy for identifying specified employees) on the date of his or her “separation from service” (within the meaning of Section 409A of the Code), the date for settlement shall be the earlier of (i) death or (ii) the later of (x) the date that settlement would otherwise be made hereunder or (y) the first business day following the end of the sixth-month period following the date of the Recipient's separation from service.

7.Rights as a Shareholder; Dividend Equivalents.

(a)The Recipient shall not have any rights of a shareholder with respect to the shares of Stock underlying the RSUs unless and until the RSUs vest and are settled by the issuance of such shares of Stock.

(b)The Recipient shall not be entitled to receive any dividends with respect to the shares of Stock underlying the RSUs unless and until such RSUs become Earned RSUs. Within 60 days following the Committee’s determination of whether, and to what extent, the Performance Criteria has been achieved, the Company shall pay to the Recipient, in respect of each Earned RSU held by the Recipient, if any, an amount in cash equal to the aggregate amount of dividends that would have been paid in respect of the shares of Stock underlying such Earned RSUs had such shares of Stock been issued to the Recipient on the first day of the Performance Period. Thereafter, the Company shall pay to the Recipient, in respect of each Earned RSU held by the Recipient, if any, whether or not vested, an amount in cash equal to the per share amount of any dividend paid to holders of shares of Stock by the Company. The Company shall pay any such amount(s) to the Recipient within 60days following the date that the dividend is paid to holders of shares of Stock. The Recipient shall be entitled to receive such dividend equivalent payments for so long as his or her Earned RSUs remain outstanding. Upon and following the vesting of the Recipient’s Earned RSUs and the settlement of such RSUs in shares of Stock, the Recipient shall be the record owner of the shares of Stock underlying the Earned RSUs unless and until such shares of Stock are sold or otherwise disposed of, and as the record owner shall be entitled to all rights of a shareholder of the Company (including voting and dividend rights).

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8.Transferability. The RSUs or the rights relating thereto may not be assigned, alienated, pledged, attached, sold or otherwise transferred or encumbered by the Recipient, except by will or the laws of descent and distribution, and upon any such transfer by will or the laws of descent and distribution, the transferee shall hold such RSUs subject to all of the terms and conditions that were applicable to the Recipient immediately prior to such transfer. Notwithstanding the foregoing, the Recipient may transfer all or part of the RSUs to any Family Member under the terms set forth in Section 10.9 of the Plan, including the requirement that any such transfer be “not for value” (as such term is defined in Section 10.9 of the Plan). Following any such transfer, the provisions of Section 5 hereof relating to termination of employment shall continue to be applied with respect to the original Recipient of the RSUs.

9.Tax Withholding. The Company shall have the right to withhold or cause to be withheld from any compensation paid to the Recipient pursuant to the Plan, the amount of any required withholding taxes in respect of the RSUs and to take all such other action as the Company deems necessary to satisfy all obligations for the payment of such withholding taxes. The Recipient agrees that if the amount payable to the Recipient by the Company in the ordinary course is insufficient to pay such withholding taxes, then the Recipient shall, upon the request of the Company, pay to the Company an amount sufficient to satisfy its tax withholding obligations.

10.Miscellaneous.

(a)Amendments. Neither this Agreement nor any provision hereof may be changed or modified except by an agreement in writing executed by the Recipient and the Company; provided, however, that any change or modification that does not adversely affect the rights hereunder of the Recipient, as they may exist immediately prior to the effective date of such change or modification, may be adopted by the Committee without an agreement in writing executed by the Recipient, and the Committee shall give the Recipient written notice of such change or modification reasonably promptly following the adoption of such change or modification.

(b)Binding Effect of the Agreement. This Agreement shall inure to the benefit of, and be binding upon, the Company, the Recipient and their respective estates, heirs, executors, transferees, successors, assigns and legal representatives.

(c)Section 409A. This Agreement is intended to comply with, or be exempt from, the requirements of Section 409A of the Code and any regulations or other effective guidance promulgated thereunder by the U.S. Department of the Treasury or the Internal Revenue Service, and shall be construed and interpreted in a manner that is consistent with such intent. To the extent that the Company determines that the Recipient would be subject to the additional taxes or penalties imposed on certain nonqualified deferred compensation plans pursuant to Section 409A of the Code as a result of any provision of this Agreement, such provision shall be deemed amended to the minimum extent necessary to avoid application of such additional taxes or penalties. The nature of any such amendment shall be determined by the Committee.

(d)Provisions Separable. In the event that any of the terms of this Agreement shall be or become or is declared to be illegal or unenforceable by any court or other authority of competent jurisdiction, such terms shall be null and void and shall be deemed deleted from this Agreement, and all the remaining terms of this Agreement shall remain in full force and effect.

(e)Notices. Any notice in connection with this Agreement shall be deemed to have been properly delivered if it is in writing and is delivered by hand or by facsimile or sent by registered certified mail, postage prepaid, to the party addressed as follows, unless another address has been substituted by notice so given:

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To the Recipient:    To the Recipient’s address as set forth on the signature page hereof.

To the Company: Equity CommonwealthTwo North Riverside Plaza, Suite 2100Chicago, IL 60606Attn: Secretary

(f)Construction. The headings and subheadings of this Agreement have been inserted for convenience only, and shall not affect the construction of the provisions hereof. All references to sections of this Agreement shall be deemed to refer as well to all subsections which form a part of such section.

(g)No Right to Continued Employment. This Agreement shall not be construed as an agreement by the Company or any Affiliate to employ or otherwise retain in any position the Recipient, nor is the Company or any Affiliate obligated to continue employing or otherwise retaining in any position the Recipient by reason of this Agreement or the grant of RSUs to the Recipient hereunder.

(h)Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original but all of which together will constitute one and the same instrument.

(i)Applicable Law. This Agreement shall be construed and enforced in accordance with the laws of the State of Maryland.

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IN WITNESS WHEREOF, the parties hereto have executed this Agreement, or caused this Agreement to be executed under seal, as of the date first above written.

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Exhibit A

Performance Criteria

Performance Criteria: The RSUs shall be earned based on the Company’s total shareholder return (“TSR”) for the Performance Period relative to the TSRs of the companies that comprise the NAREIT Office Index for the Performance Period, as set forth in the table below. Depending on the Company’s TSR relative to the TSRs of the companies that comprise the NAREIT Office Index for the Performance Period, the Recipient may earn between 0% and 249.25% of the RSUs.

Performance Criteria: Company Performance vs. NAREIT Office Index Performance	% of RSUs Earned
90th Percentile and Above (Maximum Award)	249.25	%
80th Percentile	211.87	%
70th Percentile	174.48	%
60th Percentile	137.09	%
50th Percentile (Target Award)	100.00	%
40th Percentile	68.55	%
30th Percentile	37.39	%
25th Percentile (Threshold Award)	25.37	%
Below 25th Percentile	0.00	%

Absolute Modifier: If the Company’s total TSR for the Performance Period is negative, any RSUs deemed earned based on the table above shall be reduced by 25%.

Interpolation: To the extent performance falls between two levels in the table above, linear interpolation shall apply in determining the percentage of the RSUs that are earned.

TSR Calculation: TSR performance shall be calculated as the compounded annual growth rate, expressed as a percentage (rounded to the nearest tenth of a percent (0.1%)), in the value per share during the Performance Period due to the appreciation in the price per share and dividends paid during the Performance Period, assuming dividends are reinvested. “D” is the amount of dividends paid to a shareholder of record of the Company with respect to one share during the Performance Period. The absolute TSR percentage is calculated pursuant to the formula set forth below.

Cumulative TSR = ((1*(1+TSR Year 1)*(1+TSR Year 2)*(1+TSR Year 3))-1)

=(1*(1+Cumulative TSR))^(1/3)-1

TSR for a given year shall be calculated as follows:

((Ending Share Price+D)/Beginning Share Price)-1

The performance for the companies comprising the NAREIT Office Index shall be calculated in the same manner as described above and the difference between the absolute TSR of the Company and

the average absolute TSR for the companies within the NAREIT Office Index, expressed in terms of relative percentile ranking, shall be applied to the matrix set forth above. Only companies that are public throughout the entire Performance Period shall be included for purposes of calculating the relative TSR comparison (i.e., companies that may become acquired, have an initial public offering, etc. during the Performance Period shall be excluded from the calculation altogether). For purposes of the calculation above, the Ending Share Price shall be based on a 40-day trailing average closing stock price as of the last day of the Performance Period.

Schedule toRestricted Stock Unit Agreement

(See Attachment)

Company Name            Equity Commonwealth    

Recipient Id

Recipient Name

Recipient Address

Grant Type                Restricted Stock Unit Award

Number of Units

Grant Date                

EX-10.7

Exhibit 10.7

EQUITY COMMONWEALTH

RESTRICTED STOCK AGREEMENT FOR CHAIRMAN OF THE BOARD

This Restricted Stock Agreement (this “Agreement”) is made effective as of «DATE», between the recipient set forth on the Schedule to Restricted Stock Agreement attached hereto (the “Recipient”) and Equity Commonwealth (the “Company”).

In consideration of the mutual promises and covenants contained in this Agreement, and for other valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1.Grant of Restricted Stock. Subject to the terms and conditions hereinafter set forth and the terms and conditions of the Equity Commonwealth 2015 Omnibus Incentive Plan, as it may be amended from time to time (the “Plan”), the Company hereby grants to the Recipient, effective as of the date of this Agreement (the “Grant Date”), the number of shares of Stock set forth on the Schedule to Restricted Stock Agreement attached hereto. The shares of Stock so granted are hereinafter referred to as the “Restricted Stock,” which term shall also include any shares of Stock issued to the Recipient by virtue of his or her ownership of the shares of Restricted Stock, by stock dividend, stock split, recapitalization or otherwise. Capitalized terms that are used but not defined herein have the meanings ascribed to them in the Plan.

2.Vesting; Forfeiture.

(a)Subject to Sections 2(b) and 3 hereof, the shares of Restricted Stock shall vest as follows: (i) 25% of the shares of Restricted Stock shall vest on the second anniversary of the Grant Date, (ii) 25% of the shares of Restricted Stock shall vest on the third anniversary of the Grant Date, and (iv) 50% of the shares of Restricted Stock shall vest on the fourth anniversary of the Grant Date. Any shares of Restricted Stock not vested as of any date are herein referred to as “Unvested Stock.”

(b)Subject to Section 3(a) hereof, in the event the Recipient ceases to render services to the Company as a Trustee, all shares of Unvested Stock shall be forfeited by the Recipient as of the date the Recipient ceases to render such services.

3.Termination of Service; Change in Control.

(a)If the Recipient’s service as a Trustee terminates due to the Recipient’s death, then the shares of Restricted Stock shall become vested as of the date of the termination of the Recipient’s service with the Company on a pro rata basis, determined based on (x) the number of days that have elapsed from the Grant Date through the date the Recipient ceases to be a Trustee of the Company, compared to (y) the total number of days during the period commencing on the Grant Date and ending on the fourth anniversary of the Grant Date. Notwithstanding the foregoing, if, within twelve (12) months after a Change in Control in which the shares of Restricted Stock are assumed by the acquirer or surviving entity in the Change in Control transaction, the Recipient dies or is no longer Chairman of the Board, then the shares of Restricted Stock shall become fully vested as of the date of the Recipient’s death or the date the Recipient is no longer Chairman of the Board, as applicable.

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(b)If a Change in Control occurs prior to the fourth anniversary of the Grant Date and while the Recipient is a Trustee of the Company, and the shares of Restricted Stock are not assumed by the acquirer or surviving entity in the Change in Control transaction, then the Recipient’s shares of Unvested Stock shall become fully vested as of the date of the Change in Control.

4.Transferability of Restricted Stock. Prior to the shares of Restricted Stock becoming vested as set forth in Sections 2 or 3 hereof, the shares of Restricted Stock may not be transferred, pledged, assigned, or otherwise disposed of, except (i) by will or the laws of descent and distribution or (ii) the Recipient may transfer all or part of the shares of Restricted Stock to any Family Member under the terms set forth in Section 10.9 of the Plan, including the requirement that any such transfer be “not for value” (as such term is defined in Section 10.9 of the Plan). Following any such transfer to a Family Member, the provisions of Section 3 hereof relating to termination of service shall continue to be applied with respect to the original Recipient of the shares of Restricted Stock. Notwithstanding any transfer made by the Recipient pursuant to this Section 4, the Recipient (or the Recipient’s beneficiary or estate, as applicable) shall be responsible for all income and other taxes associated with the shares of Restricted Stock.

5.Legends. Share certificates, if any, evidencing the shares of Restricted Stock shall prominently bear legends in substantially the following terms:

“THE SHARES EVIDENCED BY THIS CERTIFICATE WERE ISSUED PURSUANT TO AN EQUITY COMPENSATION PLAN MAINTAINED BY THE TRUST. THESE SHARES MAY BE SUBJECT TO TRANSFER AND/OR VESTING RESTRICTIONS, AND UNVESTED SHARES ARE SUBJECT TO FORFEITURE CONDITIONS CONTAINED IN THE PLAN, THE RELATED GRANT OF SHARES OR AN AGREEMENT BETWEEN THE TRUST AND THE INITIAL HOLDER OF THESE SHARES. A COPY OF APPLICABLE RESTRICTIONS AND FORFEITURE CONDITIONS WILL BE FURNISHED TO THE HOLDER OF THIS CERTIFICATE WITHOUT CHARGE UPON REQUEST TO THE SECRETARY OF THE TRUST.”

In the event that the shares of Restricted Stock are not evidenced by share certificates, the share books and records of the Company shall contain a notation in substantially the following terms:

“THE SHARES COVERED BY THIS STATEMENT WERE ISSUED PURSUANT TO AN EQUITY COMPENSATION PLAN MAINTAINED BY THE TRUST. THESE SHARES MAY BE SUBJECT TO TRANSFER AND/OR VESTING RESTRICTIONS, AND UNVESTED SHARES ARE SUBJECT TO FORFEITURE CONDITIONS CONTAINED IN THE PLAN, THE RELATED GRANT OF SHARES OR AN AGREEMENT BETWEEN THE TRUST AND THE INITIAL HOLDER OF THESE SHARES. A COPY OF APPLICABLE RESTRICTIONS AND FORFEITURE CONDITIONS WILL BE FURNISHED TO THE HOLDER OF THE SHARES COVERED BY THIS STATEMENT WITHOUT CHARGE UPON REQUEST TO THE SECRETARY OF THE TRUST.”

Certificates evidencing shares of Restricted Stock and shares of Restricted Stock not evidenced by certificates shall also bear or contain, as applicable, legends and notations as may be required by the Plan or the Company’s declaration of trust, any applicable supplement thereto or bylaws, each as in effect from time to time, or as the Company may otherwise determine appropriate.

Promptly following the request of the Recipient with respect to any shares of Restricted Stock (or any other shares of Stock previously granted to the Recipient) which have become vested, the

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Company shall take, at its sole cost and expense, all such actions as may be required to permit the Recipient to resell such shares including, without limitation, providing to the Company’s transfer agent certificates of officers of the Company, and opinions of counsel, and taking all such other actions as may be required to remove the legends set forth above with respect to transfer and vesting restrictions from the certificates evidencing such shares and, if applicable, from the share books and records of the Company.

6.Tax Withholding. To the extent required by law, the Company shall withhold or cause to be withheld income and other taxes incurred by the Recipient by reason of a grant of shares of Restricted Stock, and the Recipient agrees that he or she shall upon request of the Company pay to the Company an amount sufficient to satisfy its tax withholding obligations from time to time (including as shares of Restricted Stock become vested) as the Company may request.

7.Miscellaneous.

(a)Amendments. Neither this Agreement nor any provision hereof may be changed or modified except by an agreement in writing executed by the Recipient and the Company; provided, however, that any change or modification that does not adversely affect the rights hereunder of the Recipient, as they may exist immediately prior to the effective date of such change or modification, may be adopted by the Company without an agreement in writing executed by the Recipient, and the Company shall give the Recipient written notice of such change or modification reasonably promptly following the adoption of such change or modification.

(b)Binding Effect of the Agreement. This Agreement shall inure to the benefit of, and be binding upon, the Company, the Recipient and their respective estates, heirs, executors, transferees, successors, assigns and legal representatives.

(c)Provisions Separable. In the event that any of the terms of this Agreement shall be or become or is declared to be illegal or unenforceable by any court or other authority of competent jurisdiction, such terms shall be null and void and shall be deemed deleted from this Agreement, and all the remaining terms of this Agreement shall remain in full force and effect.

(d)Notices. Any notice in connection with this Agreement shall be deemed to have been properly delivered if it is in writing and is delivered by hand or by facsimile or sent by registered certified mail, postage prepaid, to the party addressed as follows, unless another address has been substituted by notice so given:

To the Recipient:    To the Recipient’s address as set forth on the signature page hereof.

To the Company: Equity CommonwealthTwo North Riverside Plaza, Suite 2100Chicago, IL 60606Attn: Secretary

(e)Construction. The headings and subheadings of this Agreement have been inserted for convenience only, and shall not affect the construction of the provisions hereof. All references to sections of this Agreement shall be deemed to refer as well to all subsections which form a part of such section.

(f)No Right to Continued Service. This Agreement shall not be construed as an agreement by the Company or any Affiliate to retain in any position the Recipient, nor is the

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Company or any Affiliate obligated to continue retaining in any position the Recipient by reason of this Agreement or the grant of shares of Restricted Stock to the Recipient hereunder.

(g)Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original but all of which together will constitute one and the same instrument.

(h)Applicable Law. This Agreement shall be construed and enforced in accordance with the laws of the State of Maryland.

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IN WITNESS WHEREOF, the parties hereto have executed this Agreement, or caused this Agreement to be executed under seal, as of the date first above written.

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Schedule to Restricted Stock Agreement

(See Attachment)

6

Company Name            Equity Commonwealth

Recipient Id

Recipient Name

Recipient Address

Grant Type                Restricted Stock Award

Number of Shares

Grant Date                

EX-10.8

Exhibit 10.8

EQUITY COMMONWEALTH

RESTRICTED STOCK UNIT AGREEMENT FOR CHAIRMAN OF THE BOARD

This Restricted Stock Unit Agreement (this “Agreement”) is made effective as of «DATE», between the recipient set forth on the Schedule to Restricted Stock Unit Agreement attached hereto (the “Recipient”) and Equity Commonwealth (the “Company”).

In consideration of the mutual promises and covenants contained in this Agreement, and for other valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1.Grant of Restricted Stock Units. Subject to the terms and conditions hereinafter set forth and the terms and conditions of the Equity Commonwealth 2015 Omnibus Incentive Plan, as it may be amended from time to time (the “Plan”), the Company hereby grants to the Recipient, effective as of the date of this Agreement, the number of restricted stock units set forth on the Schedule to Restricted Stock Unit Agreement attached hereto (the “RSUs”). Each RSU represents the right to receive one share of Stock, subject to the terms and conditions set forth in this Agreement and the Plan. The number of RSUs that the Recipient actually earns for the Performance Period will be determined by the level of achievement of the Performance Criteria in accordance with Exhibit A attached hereto, and may be higher or lower than the number of RSUs granted to the Recipient. Capitalized terms that are used but not defined herein have the meanings ascribed to them in the Plan.

2.Performance Period. For purposes of this Agreement, the term “Performance Period” shall be the period commencing on «Commencement Date» and ending on «Third Anniversary of Commencement Date».

3.Performance Criteria.

(a)The number of RSUs earned by the Recipient for the Performance Period (the “Earned RSUs”) shall be determined at the end of the Performance Period based on the level of achievement of the Performance Criteria in accordance with Exhibit A. All determinations of whether and to what extent the Performance Criteria has been achieved, the number of RSUs earned by the Recipient, and all other matters related to this Section 3 shall be made by the Committee in its sole discretion. Any RSUs that do not become Earned RSUs at the end of the Performance Period, as determined by the Committee in its sole discretion, shall be immediately forfeited by the Recipient.

(b)Following the completion of the Performance Period, the Committee shall determine (i) whether, and to what extent, the Performance Criteria has been achieved, and (ii) the number of RSUs that shall be deemed Earned RSUs, if any. Such determination shall be final, conclusive and binding on the Recipient, and on all other persons, to the maximum extent permitted by law.

4.Vesting; Forfeiture.

(a)50% of the Earned RSUs shall vest on the date that the Committee determines the achievement of the Performance Criteria in accordance with Section 3(a) hereof, subject to the Recipient’s continued service with the Company through such date.

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(b)50% of the Earned RSUs shall vest on «Fourth Anniversary of Commencement Date», subject to the Recipient’s continued service with the Company through such date.

(c)Subject to Section 5 hereof, in the event the Recipient ceases to render services to the Company as a Trustee, all unvested RSUs shall be forfeited by the Recipient as of the date the Recipient ceases to render such services.

5.Termination of Service; Change in Control.

(a)If, during the Performance Period, the Recipient’s service as a Trustee terminates due to the Recipient’s death, then the number of RSUs that are earned by the Recipient shall be determined at the end of the Performance Period in accordance with Section 3 hereof, and the Recipient’s Earned RSUs, if any, shall become vested as of the date that the Committee determines the achievement of the Performance Criteria in accordance with Section 3(a) hereof on a pro rata basis, determined based on (x) the number of days that have elapsed from the beginning of the Performance Period through the date of the Recipient’s death, compared to (y) the total number of days during the period commencing on «Commencement Date» and ending on «Fourth Anniversary of Commencement Date». Notwithstanding the foregoing, if, during the Performance Period and within twelve (12) months after a Change in Control in which the RSUs are assumed by the acquirer or surviving entity in the Change in Control transaction, the Recipient dies or is no longer Chairman of the Board, then any such Earned RSUs shall become fully vested as of the date that the Committee determines the achievement of the Performance Criteria in accordance with Section 3(a) hereof. With respect to Earned RSUs held by the Recipient for which the Performance Period is complete but for which the additional vesting period is incomplete, any restrictions on the Earned RSUs shall lapse and such Earned RSUs shall automatically become fully vested as of (1) the date the Recipient is no longer Chairman of the Board, provided such date occurs within twelve (12) months after a Change in Control in which the RSUs are assumed by the acquirer or surviving entity in the Change in Control transaction, or (2) the date of the Recipient’s death. The number of shares of Stock that become vested in accordance with this Section 5(a) shall be issued to the Recipient as soon as practicable, but no later than 60 days, following the later to occur of (i) the date that the Committee determines the achievement of the Performance Criteria in accordance with Section 3(a) hereof and (ii) the earlier to occur of (x) the date of the Recipient’s death and (y) «Fourth Anniversary of Commencement Date».

(b)If, during the Performance Period, a Change in Control occurs while the Recipient is a Trustee of the Company, and the RSUs are not assumed by the acquirer or surviving entity in the Change in Control transaction, then the Recipient’s RSUs shall be deemed earned based on the actual level of achievement of the Performance Criteria measured as of the date of the Change in Control, as determined by the Committee based on a then forty (40) day trailing average price per share of Stock. Any such Earned RSUs shall be fully vested. With respect to Earned RSUs held by the Recipient for which the Performance Period is complete but for which the additional vesting period is incomplete, any restrictions on the Earned RSUs shall lapse and such Earned RSUs shall automatically become fully vested as of the date of the Change in Control. As of the date of the Change in Control, the Company shall cause one share of Stock to be issued to the Recipient for each such Earned RSU that fully vests, less applicable withholding taxes pursuant to Section 9 hereof. Notwithstanding the foregoing, to the extent necessary for the Recipient to avoid taxes and/or penalties under Section 409A of the Code, a Change in Control shall not be deemed to occur unless it constitutes a “change in control event” within the meaning of Section 1.409A-3(i)(5) of the Treasury Regulations promulgated under Section 409A of the Code.

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6.Settlement of RSUs. Except as provided in Section 5 hereof, as soon as practicable following the applicable vesting date of any Earned RSUs held by the Recipient, but in no event later than 60 days after such vesting date, the Company shall cause one share of Stock to be issued to the Recipient for each such Earned RSU, less applicable withholding taxes pursuant to Section 9 hereof. The Company shall cause such shares of Stock (less any shares withheld to pay taxes) to be delivered, either by book-entry registration or in the form of a stock certificate or certificates, registered in the Recipient’s name or in the names of the Recipient’s legal representatives, beneficiaries or heirs, as the case may be. Notwithstanding the foregoing, in the event any settlement of the RSUs hereunder constitutes “deferred compensation” within the meaning of Section 409A of the Code, and the Recipient is a “specified employee” (as determined under the Company's policy for identifying specified employees) on the date of his or her “separation from service” (within the meaning of Section 409A of the Code), the date for settlement shall be the earlier of (i) death or (ii) the later of (x) the date that settlement would otherwise be made hereunder or (y) the first business day following the end of the sixth-month period following the date of the Recipient's separation from service.

7.Rights as a Shareholder; Dividend Equivalents.

(a)The Recipient shall not have any rights of a shareholder with respect to the shares of Stock underlying the RSUs unless and until the RSUs vest and are settled by the issuance of such shares of Stock.

(b)The Recipient shall not be entitled to receive any dividends with respect to the shares of Stock underlying the RSUs unless and until such RSUs become Earned RSUs. Within 60 days following the Committee’s determination of whether, and to what extent, the Performance Criteria has been achieved, the Company shall pay to the Recipient, in respect of each Earned RSU held by the Recipient, if any, an amount in cash equal to the aggregate amount of dividends that would have been paid in respect of the shares of Stock underlying such Earned RSUs had such shares of Stock been issued to the Recipient on the first day of the Performance Period. Thereafter, the Company shall pay to the Recipient, in respect of each Earned RSU held by the Recipient, if any, whether or not vested, an amount in cash equal to the per share amount of any dividend paid to holders of shares of Stock by the Company. The Company shall pay any such amount(s) to the Recipient within 60days following the date that the dividend is paid to holders of shares of Stock. The Recipient shall be entitled to receive such dividend equivalent payments for so long as his or her Earned RSUs remain outstanding. Upon and following the vesting of the Recipient’s Earned RSUs and the settlement of such RSUs in shares of Stock, the Recipient shall be the record owner of the shares of Stock underlying the Earned RSUs unless and until such shares of Stock are sold or otherwise disposed of, and as the record owner shall be entitled to all rights of a shareholder of the Company (including voting and dividend rights).

8.Transferability. The RSUs or the rights relating thereto may not be assigned, alienated, pledged, attached, sold or otherwise transferred or encumbered by the Recipient, except by will or the laws of descent and distribution, and upon any such transfer by will or the laws of descent and distribution, the transferee shall hold such RSUs subject to all of the terms and conditions that were applicable to the Recipient immediately prior to such transfer. Notwithstanding the foregoing, the Recipient may transfer all or part of the RSUs to any Family Member under the terms set forth in Section 10.9 of the Plan, including the requirement that any such transfer be “not for value” (as such term is defined in Section 10.9 of the Plan). Following any such transfer, the provisions of Section 5 hereof relating to termination of service shall continue to be applied with respect to the original Recipient of the RSUs.

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9.Tax Withholding. The Company shall have the right to withhold or cause to be withheld from any compensation paid to the Recipient pursuant to the Plan, the amount of any required withholding taxes in respect of the RSUs and to take all such other action as the Company deems necessary to satisfy all obligations for the payment of such withholding taxes. The Recipient agrees that if the amount payable to the Recipient by the Company in the ordinary course is insufficient to pay such withholding taxes, then the Recipient shall, upon the request of the Company, pay to the Company an amount sufficient to satisfy its tax withholding obligations.

10.Miscellaneous.

(a)Amendments. Neither this Agreement nor any provision hereof may be changed or modified except by an agreement in writing executed by the Recipient and the Company; provided, however, that any change or modification that does not adversely affect the rights hereunder of the Recipient, as they may exist immediately prior to the effective date of such change or modification, may be adopted by the Committee without an agreement in writing executed by the Recipient, and the Committee shall give the Recipient written notice of such change or modification reasonably promptly following the adoption of such change or modification.

(b)Binding Effect of the Agreement. This Agreement shall inure to the benefit of, and be binding upon, the Company, the Recipient and their respective estates, heirs, executors, transferees, successors, assigns and legal representatives.

(c)Section 409A. This Agreement is intended to comply with, or be exempt from, the requirements of Section 409A of the Code and any regulations or other effective guidance promulgated thereunder by the U.S. Department of the Treasury or the Internal Revenue Service, and shall be construed and interpreted in a manner that is consistent with such intent. To the extent that the Company determines that the Recipient would be subject to the additional taxes or penalties imposed on certain nonqualified deferred compensation plans pursuant to Section 409A of the Code as a result of any provision of this Agreement, such provision shall be deemed amended to the minimum extent necessary to avoid application of such additional taxes or penalties. The nature of any such amendment shall be determined by the Committee.

(d)Provisions Separable. In the event that any of the terms of this Agreement shall be or become or is declared to be illegal or unenforceable by any court or other authority of competent jurisdiction, such terms shall be null and void and shall be deemed deleted from this Agreement, and all the remaining terms of this Agreement shall remain in full force and effect.

(e)Notices. Any notice in connection with this Agreement shall be deemed to have been properly delivered if it is in writing and is delivered by hand or by facsimile or sent by registered certified mail, postage prepaid, to the party addressed as follows, unless another address has been substituted by notice so given:

To the Recipient:    To the Recipient’s address as set forth on the signature page hereof.

To the Company: Equity CommonwealthTwo North Riverside Plaza, Suite 2100Chicago, IL 60606Attn: Secretary

(f)Construction. The headings and subheadings of this Agreement have been inserted for convenience only, and shall not affect the construction of the provisions hereof. All

4

references to sections of this Agreement shall be deemed to refer as well to all subsections which form a part of such section.

(g)No Right to Continued Service. This Agreement shall not be construed as an agreement by the Company or any Affiliate to retain in any position the Recipient, nor is the Company or any Affiliate obligated to continue retaining in any position the Recipient by reason of this Agreement or the grant of RSUs to the Recipient hereunder.

(h)Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original but all of which together will constitute one and the same instrument.

(i)Applicable Law. This Agreement shall be construed and enforced in accordance with the laws of the State of Maryland.

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IN WITNESS WHEREOF, the parties hereto have executed this Agreement, or caused this Agreement to be executed under seal, as of the date first above written.

6

Exhibit A

Performance Criteria

Performance Criteria: The RSUs shall be earned based on the Company’s total shareholder return (“TSR”) for the Performance Period relative to the TSRs of the companies that comprise the NAREIT Office Index for the Performance Period, as set forth in the table below. Depending on the Company’s TSR relative to the TSRs of the companies that comprise the NAREIT Office Index for the Performance Period, the Recipient may earn between 0% and 249.25% of the RSUs.

Performance Criteria: Company Performance vs. NAREIT Office Index Performance	% of RSUs Earned
90th Percentile and Above (Maximum Award)	249.25	%
80th Percentile	211.87	%
70th Percentile	174.48	%
60th Percentile	137.09	%
50th Percentile (Target Award)	100.00	%
40th Percentile	68.55	%
30th Percentile	37.39	%
25th Percentile (Threshold Award)	25.37	%
Below 25th Percentile	0.00	%

Absolute Modifier: If the Company’s total TSR for the Performance Period is negative, any RSUs deemed earned based on the table above shall be reduced by 25%.

Interpolation: To the extent performance falls between two levels in the table above, linear interpolation shall apply in determining the percentage of the RSUs that are earned.

TSR Calculation: TSR performance shall be calculated as the compounded annual growth rate, expressed as a percentage (rounded to the nearest tenth of a percent (0.1%)), in the value per share during the Performance Period due to the appreciation in the price per share and dividends paid during the Performance Period, assuming dividends are reinvested. “D” is the amount of dividends paid to a shareholder of record of the Company with respect to one share during the Performance Period. The absolute TSR percentage is calculated pursuant to the formula set forth below.

Cumulative TSR = ((1*(1+TSR Year 1)*(1+TSR Year 2)*(1+TSR Year 3))-1)

=(1*(1+Cumulative TSR))^(1/3)-1

TSR for a given year shall be calculated as follows:

((Ending Share Price+D)/Beginning Share Price)-1

The performance for the companies comprising the NAREIT Office Index shall be calculated in the same manner as described above and the difference between the absolute TSR of the Company and

the average absolute TSR for the companies within the NAREIT Office Index, expressed in terms of relative percentile ranking, shall be applied to the matrix set forth above. Only companies that are public throughout the entire Performance Period shall be included for purposes of calculating the relative TSR comparison (i.e., companies that may become acquired, have an initial public offering, etc. during the Performance Period shall be excluded from the calculation altogether). For purposes of the calculation above, the Ending Share Price shall be based on a 40-day trailing average closing stock price as of the last day of the Performance Period.

Schedule to Restricted Stock Unit Agreement

(See Attachment)

Company Name            Equity Commonwealth    

Recipient Id

Recipient Name

Recipient Address

Grant Type                Restricted Stock Unit Award

Number of Units

Grant Date                

EX-10.18

Exhibit 10.18

EQUITY COMMONWEALTH

Schedule of Annual Independent Trustee Fees and Other Compensation

The independent trustees of Equity Commonwealth are entitled to the following annual compensation:

Annual Retainer - Cash	$60,000
Annual Retainer - Restricted Share Awards	Each independent trustee will receive restricted common shares with a value of $100,000 on an annual basis, which shares will vest on the one-year anniversary of the grant date.
Lead Trustee Annual Retainer	$30,000
Audit Committee Chair Annual Retainer	$20,000
Compensation Committee Chair Annual Retainer	$15,000
Nominating and Corporate Governance Committee Chair Annual Retainer	$15,000
Audit Committee Member	$8,000
Compensation Committee Member	$6, 000
Governance Committee Member	$6,000
Independent Special Litigation Committee Member	$6,000
Reimbursements	Each independent trustee will be entitled to reimbursement for travel expenses related to a Board or Committee meeting.

Annual Compensation for Chairman of the Board of Trustees

The Chairman of the Board is entitled to the following annual compensation:

Annual Retainer - LTIP Awards

The Chairman of the Board will receive equity awards pursuant to the Company’s Long-Term Incentive Plan (the “LTIP Awards”). 33% of the target LTIP Awards will consist of restricted common shares subject to time-based vesting restrictions. 67% of the target LTIP Awards will consist of restricted share units (“RSUs”) subject to time-based and performance-based vesting restrictions. The LTIP Awards issued will have a target value of $2,000,000. The number of RSUs that will be earned by the Chairman of the Board, if any, will not be determined until the end of a three-year performance period, and therefore the actual value of the RSUs could be higher or lower than the foregoing target level, depending on the Company’s achievement of the applicable performance criteria.

Reimbursements

The Chairman of the Board will be entitled to reimbursement for travel expenses related to company business and Board or Committee meetings.

EX-12.1

Exhibit 12.1

EQUITY COMMONWEALTH

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(dollars in thousands)

	Year Ended December 31,
	2015			2014			2013(1)				2012(1)			2011(1)
Earnings:
Income (loss) from continuing operations before income tax expense and equity in earnings of investees	$	102,221		$	(63	)	$	(62,034	)		$	84,484		$	53,992
Gains on equity transactions of investees	—			(17,020		)	—				(7,246		)	(11,177		)
Fixed charges	107,316			143,838			174,753				204,244			195,024
Distributions from investees	—			20,680			24,079				16,816			16,617
Adjusted Earnings	$	209,537		$	147,435		$	136,798			$	298,298		$	254,456
Fixed Charges:
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees)	$	107,316		$	143,838		$	174,753			$	204,244		$	195,024
Total Fixed Charges	$	107,316		$	143,838		$	174,753			$	204,244		$	195,024
Ratio of Earnings to Fixed Charges	2.0		x	1.0x			0.8x			(2)	1.5x			1.3x

(1) Reclassifications have been made to the prior years' financial statements to conform to the current year's presentation.

(2) The deficiency for this period was $37,995.

EX-12.2

Exhibit 12.2

EQUITY COMMONWEALTH

COMPUTATION OF RATIO OF EARNINGS TO COMBINED

FIXED CHARGES AND PREFERRED DISTRIBUTIONS

(dollars in thousands)

	Year Ended December 31,
	2015			2014				2013(1)				2012(1)			2011(1)
Earnings:
Income (loss) from continuing operations before income tax expense and equity in earnings of investees	102,221			$	(63	)		$	(62,034	)		$	84,484		$	53,992
Gains on equity transactions of investees	—			(17,020		)		—				(7,246		)	(11,177		)
Fixed charges before preferred distributions	107,316			143,838				174,753				204,244			195,024
Distributions from investees	—			20,680				24,079				16,816			16,617
Adjusted Earnings	$	209,537		$	147,435			$	136,798			$	298,298		$	254,456
Fixed Charges and Preferred Distributions:
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees)	$	107,316		$	143,838			$	174,753			$	204,244		$	195,024
Preferred distributions	27,924			32,095				44,604				51,552			46,985
Combined Fixed Charges and Preferred Distributions	$	135,240		$	175,933			$	219,357			$	255,796		$	242,009
Ratio of Earnings to Combined Fixed Charges and Preferred Distributions	1.5		x	0.8x			(2)	0.6x			(3)	1.2x			1.1x

(1) Reclassifications have been made to the prior years' financial statements to conform to the current year's presentation.

(2) The deficiency for this period was $28,498.

(3) The deficiency for this period was $82,559.

EX-21.1

Exhibit 21.1

EQUITY COMMONWEALTH

SUBSIDIARIES OF THE REGISTRANT

Name	State of Formation, Organization or Incorporation
ASA Properties Trust	Maryland
BD 33 Stiles Lane Property LLC	Maryland
Blue Dog LLC	Maryland
Blue Dog Properties Trust	Maryland
Candler Associates, L.L.C.	Maryland
Candler Property Trust	Maryland
CW 111 East Wacker LLC	Delaware
CW 600 West Chicago LLC	Delaware
CW Meridian Inc.	Maryland
CW Monument Circle Inc.	Maryland
CW Nom LLC	Delaware
CW Parkshore Plaza LLC	Delaware
CW Wisconsin Avenue LLC	Delaware
CWH Capitol Tower Inc.	Maryland
CWH Vineyard Properties Trust	Maryland
EQC Securities LLC	Delaware
Equity Commonwealth EQC	Delaware
Equity Commonwealth Management LLC	Delaware
Diamond Head LLC	Maryland
First Associates LLC	Maryland
Herald Square LLC	Delaware
HRPT Lenexa Properties Trust	Maryland
HRPT Medical Buildings Realty Trust (Nominee Trust)	Massachusetts
HRPT TRS, Inc.	Delaware
Hub Acquisition Trust	Maryland
Hub Highridge, LLC	Delaware
Hub Highridge Properties Trust	Maryland
Hub Mid-West LLC	Maryland
Hub Milwaukee Center Properties LLC	Delaware
Hub OEC Properties LLC	Delaware
Hub Properties GA LLC	Maryland
Hub Properties Trust	Maryland
Hub Realty Funding, Inc.	Delaware
Nine Penn Center Associates, L.P.	Pennsylvania
Nine Penn Center Properties Trust	Maryland
Oscar Properties Trust	Maryland

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statements (Form S-3 No. 333-205055 and Form S-8 No. 333-205068) of Equity Commonwealth and in the related Prospectus of our reports dated February 18, 2016, with respect to the consolidated financial statements and schedules of Equity Commonwealth, and the effectiveness of internal control over financial reporting of Equity Commonwealth included in this Annual Report (Form 10-K) for the year ended December 31, 2015.

/s/ Ernst & Young LLP

Chicago, Illinois

February 18, 2016

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO EXCHANGE ACT RULES 13a-14(a) AND 15d-14(a)

I, David A. Helfand, certify that:

1.I have reviewed this Annual Report on Form 10-K of Equity Commonwealth;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 18, 2016	/s/ David A. Helfand
		David A. Helfand
		President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION PURSUANT TO EXCHANGE ACT RULES 13a-14(a) AND 15d-14(a)

I, Adam S. Markman, certify that:

1.I have reviewed this Annual Report on Form 10-K of Equity Commonwealth;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 18, 2016	/s/Adam S. Markman
		Adam S. Markman
		Executive Vice President, Chief
		Financial Officer and Treasurer

EX-32.1

Exhibit 32.1

Certification Pursuant to 18 U.S.C. Sec. 1350

In connection with the filing by Equity Commonwealth (the “Company”) of the Annual Report on Form 10-K for the year ended December 31, 2015 (the “Report”), each of the undersigned hereby certifies, to the best of his knowledge:

1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ David A. Helfand	/s/ Adam S. Markman
David A. Helfand	Adam S. Markman
President and Chief Executive Officer	Executive Vice President, Chief Financial Officer
	and Treasurer
Date: February 18, 2016

XML

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2015	Feb. 16, 2016	Jun. 30, 2015
Document and Entity Information
Entity Registrant Name	Equity Commonwealth
Entity Central Index Key	0000803649
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		125,925,375
Entity Public Float			$ 3.3

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Real estate properties:
Land	$ 389,410	$ 714,238
Buildings and improvements	3,497,942	5,014,205
Total real estate properties, at cost, gross	3,887,352	5,728,443
Accumulated depreciation	(898,939)	(1,030,445)
Total real estate properties, at cost, net	2,988,413	4,697,998
Acquired real estate leases, net	88,760	198,287
Cash and cash equivalents	1,802,729	364,516
Restricted cash	32,245	32,257
Rents receivable, net of allowance for doubtful accounts of $7,715 and $6,565, respectively	174,676	248,101
Other assets, net	157,549	220,480
Total assets	5,244,372	5,761,639
LIABILITIES AND SHAREHOLDERS’ EQUITY
Senior unsecured debt, net	1,460,592	1,598,416
Mortgage notes payable, net	249,732	609,249
Accounts payable and accrued expenses	123,587	162,204
Assumed real estate lease obligations, net	4,296	26,784
Rent collected in advance	27,340	31,359
Security deposits	10,338	14,044
Total liabilities	$ 1,875,885	$ 2,442,056
Commitments and Contingencies
Preferred shares of beneficial interest, $0.01 par value: 50,000,000 shares authorized;
Common shares of beneficial interest, $0.01 par value: 350,000,000 shares authorized; 126,349,914 and 129,607,279 shares issued and outstanding, respectively	$ 1,263	$ 1,296
Additional paid in capital	4,414,611	4,487,133
Cumulative net income	2,333,709	2,233,852
Cumulative other comprehensive loss	(3,687)	(53,216)
Cumulative common distributions	(3,111,868)	(3,111,868)
Cumulative preferred distributions	(650,195)	(622,271)
Total shareholders’ equity	3,368,487	3,319,583
Total liabilities and shareholders’ equity	5,244,372	5,761,639
Series D
Preferred shares of beneficial interest, $0.01 par value: 50,000,000 shares authorized;
Series D preferred shares; 6 1/2% cumulative convertible; 4,915,196 and 4,915,497 shares issued and outstanding, respectively, aggregate liquidation preference of $122,880 and $122,887, respectively	119,263	119,266
Total shareholders’ equity	119,263	119,266
Series E
Preferred shares of beneficial interest, $0.01 par value: 50,000,000 shares authorized;
Series E preferred shares; 7 1/4% cumulative redeemable on or after May 15, 2016; 11,000,000 shares issued and outstanding, aggregate liquidation preference $275,000	265,391	265,391
Total shareholders’ equity	$ 265,391	$ 265,391

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Rents receivable, allowance for doubtful accounts	$ 7,715	$ 6,565
Common shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares of beneficial interest, shares authorized (in shares)	350,000,000	350,000,000
Common shares of beneficial interest, shares issued (in shares)	126,349,914	129,607,279
Common shares of beneficial interest, shares outstanding (in shares)	126,349,914	129,607,279
Series D
Preferred shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares of beneficial interest, shares authorized (in shares)	50,000,000	50,000,000
Preferred shares, dividend yield	6.50%	6.50%
Preferred shares of beneficial interest, shares issued (in shares)	4,915,196	4,915,497
Preferred shares, of beneficial interest, shares outstanding (in shares)	4,915,196	4,915,497
Preferred shares, aggregate liquidation preference	$ 122,880	$ 122,887
Common shares of beneficial interest, shares issued (in shares)	4,915,196	4,915,497
Series E
Preferred shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares of beneficial interest, shares authorized (in shares)	50,000,000	50,000,000
Preferred shares, dividend yield	7.25%	7.25%
Preferred shares of beneficial interest, shares issued (in shares)	11,000,000	11,000,000
Preferred shares, of beneficial interest, shares outstanding (in shares)	11,000,000	11,000,000
Preferred shares, aggregate liquidation preference	$ 275,000	$ 275,000
Common shares of beneficial interest, shares issued (in shares)	11,000,000	11,000,000

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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Rental income	$ 570,382	$ 691,699	$ 763,262
Tenant reimbursements and other income	144,509	170,158	189,767
Total revenues	714,891	861,857	953,029
Expenses:
Operating expenses	324,948	387,982	410,045
Depreciation and amortization	194,001	227,532	234,402
General and administrative	57,457	113,155	80,504
Loss on asset impairment	17,162	185,067	124,253
Acquisition related costs	0	5	318
Total expenses	593,568	913,741	849,522
Operating income (loss)	121,323	(51,884)	103,507
Interest and other income	5,989	1,561	1,229
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of $1,028, $(549), and $9, respectively)	(107,316)	(143,230)	(173,011)
Gain (loss) on early extinguishment of debt	6,661	4,909	(60,052)
Gain on sale of equity investment	0	171,561	66,293
Gain on issuance of shares by an equity investee	0	17,020	0
Foreign currency exchange loss	(8,857)	0	0
Gain on sale of properties	84,421	0	1,596
Income (loss) from continuing operations before income taxes and equity in earnings of investees	102,221	(63)	(60,438)
Income tax expense	(2,364)	(3,191)	(2,634)
Equity in earnings of investees	0	24,460	25,754
Income (loss) from continuing operations	99,857	21,206	(37,318)
Discontinued operations:
Income from discontinued operations	0	8,389	6,393
Loss on asset impairment from discontinued operations	0	(2,238)	(102,869)
Loss on early extinguishment of debt from discontinued operations	0	(3,345)	(1,011)
Net loss on sale of properties from discontinued operations	0	0	(22,162)
Net income attributable to noncontrolling interest in consolidated subsidiary	0	0	(20,093)
Net income (loss) attributable to Equity Commonwealth	99,857	24,012	(177,060)
Net income (loss)	99,857	24,012	(156,967)
Preferred distributions	(27,924)	(32,095)	(44,604)
Excess fair value of consideration over carrying value of preferred shares	0	(16,205)	0
Numerator for net income (loss) per share - basic	71,933	(24,288)	(221,664)
Amounts attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations	71,933	(27,094)	(102,015)
Income from discontinued operations	0	8,389	6,393
Loss on asset impairment from discontinued operations	0	(2,238)	(102,869)
Loss on early extinguishment of debt from discontinued operations	0	(3,345)	(1,011)
Numerator for net income (loss) per share - basic	$ 71,933	$ (24,288)	$ (221,664)
Weighted average common shares outstanding — basic (in shares)	128,621	125,163	112,378
Weighted average common shares outstanding — diluted (in shares)	129,437	125,163	112,378
Basic earnings per common share attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations (in dollars per share)	$ 0.56	$ (0.21)	$ (0.91)
Income (loss) from discontinued operations (in dollars per share)	0.00	0.02	(1.06)
Net income (loss) (in dollars per share)	0.56	(0.19)	(1.97)
Diluted earnings per common share attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations (in dollars per share)	0.56	(0.21)	(0.91)
Income (loss) from discontinued operations (in dollars per share)	0.00	0.02	(1.06)
Net income (loss) (in dollars per share)	$ 0.56	$ (0.19)	$ (1.97)

XML

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Debt discounts, premiums and deferred financing fees	$ 1,028	$ (549)	$ 9

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 99,857	$ 24,012	$ (156,967)
Other comprehensive income (loss), net of tax:
Unrealized gain on derivative instruments and other assets	612	7,407	4,918
Foreign currency translation adjustments	48,917	(22,270)	(43,718)
Equity in unrealized loss of an investee	0	(22)	(132)
Total comprehensive income (loss)	149,386	9,127	(195,899)
Less: comprehensive income attributable to noncontrolling interest in consolidated subsidiary	0	0	(20,057)
Comprehensive income (loss) attributable to Equity Commonwealth	$ 149,386	$ 9,127	$ (215,956)

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Series D	Series E	Cumulative Preferred Distributions	Common Stock	Cumulative Common Distributions	Additional Paid-in Capital	Cumulative Net Income	Cumulative Other Comprehensive Income (Loss)	Noncontrolling Interest in Consolidated Subsidiary
Net income (loss)	$ (156,967)							$ (177,060)		$ 20,093
Balance at Dec. 31, 2012	3,501,468	$ 368,270	$ 265,391	$ (529,367)	$ 838	$ (2,972,569)	$ 3,585,400	2,386,900	$ 565	396,040
Balance (in shares) at Dec. 31, 2012		15,180,000	11,000,000		83,804,068
Comprehensive income (loss):
Unrealized loss on derivative instrument	4,918								4,918
Foreign currency translation adjustments	(43,718)								(43,718)
Equity in unrealized income of an investee	(132)								(96)	(36)
Total comprehensive income (loss)	(195,899)
Issuance of shares, net	626,809				$ 345		626,506			(42)
Issuance of shares, net (in shares)					34,500,000
Share grants	1,821				$ 1		1,536			284
Share grants (in shares)					82,850
Adjustments to noncontrolling interest resulting from changes in ownership of a subsidiary	0						32			(32)
Distributions	(169,169)			(44,604)		(109,702)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(14,863)
Deconsolidation of a subsidiary	(401,444)									(401,444)
Balance at Dec. 31, 2013	3,363,586	$ 368,270	$ 265,391	(573,971)	$ 1,184	(3,082,271)	4,213,474	2,209,840	(38,331)	0
Balance (in shares) at Dec. 31, 2013		15,180,000	11,000,000		118,386,918
Net income (loss)	24,012							24,012		0
Comprehensive income (loss):
Unrealized loss on derivative instrument	7,407								7,407
Foreign currency translation adjustments	(22,270)								(22,270)
Equity in unrealized income of an investee	(22)								(22)	0
Total comprehensive income (loss)	9,127
Issuance of shares, net	2,402				$ 0		2,402			0
Issuance of shares, net (in shares)					90,135
Share grants	6,160				$ 8		6,152
Share grants (in shares)					717,727
Distributions	(61,692)			(32,095)		(29,597)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Redemption of shares	0	$ (249,004)		(16,205)	$ 104		265,105
Redemption of shares (in shares)		10,264,503			10,412,499
Balance at Dec. 31, 2014	$ 3,319,583	$ 119,266	$ 265,391	(622,271)	$ 1,296	(3,111,868)	4,487,133	2,233,852	(53,216)	0
Balance (in shares) at Dec. 31, 2014	129,607,279	4,915,497	11,000,000		129,607,279
Net income (loss)	$ 99,857							99,857		0
Comprehensive income (loss):
Unrealized loss on derivative instrument	612								612
Foreign currency translation adjustments	48,917								48,917
Equity in unrealized income of an investee	0
Total comprehensive income (loss)	149,386
Issuance of shares, net	0				$ 0		0			0
Stock Repurchased During Period, Shares					(3,410,300)
Stock Repurchased During Period, Value	(87,983)				$ (35)		(87,948)
Issuance of shares, net (in shares)					0
Share grants	15,425				$ 2		15,423
Share grants (in shares)					152,791
Distributions	(27,924)			(27,924)		0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Redemption of shares	0	$ (3)		0	$ 0		3
Redemption of shares (in shares)		301			144
Balance at Dec. 31, 2015	$ 3,368,487	$ 119,263	$ 265,391	$ (650,195)	$ 1,263	$ (3,111,868)	$ 4,414,611	$ 2,333,709	$ (3,687)	$ 0
Balance (in shares) at Dec. 31, 2015	126,349,914	4,915,196	11,000,000		126,349,914

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 99,857	$ 24,012	$ (156,967)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation	145,888	166,076	178,353
Net amortization of debt discounts, premiums and deferred financing fees	1,028	(552)	81
Straight line rental income	(5,255)	(12,759)	(31,229)
Amortization of acquired real estate leases	34,277	51,140	59,274
Other amortization	21,309	20,931	18,850
Share-based compensation	15,425	5,733	0
Loss on asset impairment	17,162	187,305	227,122
(Gain) loss on early extinguishment of debt	(6,661)	(1,564)	61,063
Equity in earnings of investees	0	(24,460)	(25,754)
Gain on sale of equity investments	0	(171,561)	(66,293)
Gain on issuance of shares by an equity investee	0	(17,020)	0
Distributions of earnings from investees	0	20,680	23,911
Foreign currency exchange loss	8,857	0	0
Net (gain) loss on sale of properties	(84,421)	0	20,566
Other non-cash expenses	0	2,402	0
Change in assets and liabilities:
Restricted cash	(6,570)	3,486	(1,832)
Rents receivable and other assets	(47,472)	(30,785)	(57,039)
Accounts payable and accrued expenses	(4,643)	10,389	(14,333)
Rent collected in advance	(8,462)	(229)	125
Security deposits	1,225	433	611
Due to related persons	0	(9,277)	(1,858)
Cash provided by operating activities	181,544	224,380	234,651
CASH FLOWS FROM INVESTING ACTIVITIES:
Real estate acquisitions	0	0	(154,370)
Real estate improvements	(70,633)	(99,651)	(114,451)
Principal payments received from direct financing lease	7,352	7,311	6,970
Principal payments received from real estate mortgages receivable	0	0	1,000
Proceeds from sale of properties, net	1,691,831	185,299	224,976
Purchase of securities	0	23,988	0
Proceeds from sale of securities	27,068	0	0
Proceeds from sale of equity investments, net	0	710,492	239,576
Distributions in excess of earnings from investees	0	0	168
Increase in restricted cash	(6,725)	(8,225)	(9,102)
Deconsolidation of a subsidiary	0	0	(12,286)
Cash provided by investing activities	1,648,893	771,238	182,481
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common shares, net	0	0	626,809
Purchase and retirement of common shares	(87,983)	0	0
Repurchase and retirement of outstanding debt securities	0	0	(728,021)
Proceeds from borrowings	0	0	1,036,000
Payments on borrowings	(259,672)	(785,316)	(1,065,432)
Deferred financing fees	(7,143)	0	(1,204)
Distributions to common shareholders	0	(29,597)	(109,702)
Distributions to preferred shareholders	(27,924)	(32,095)	(44,604)
Distributions to noncontrolling interest in consolidated subsidiary	0	0	(14,863)
Cash used in financing activities	(382,722)	(847,008)	(301,017)
Effect of exchange rate changes on cash	(9,502)	(1,126)	(1,302)
Increase in cash and cash equivalents	1,438,213	147,484	114,813
Cash and cash equivalents at beginning of period	364,516	217,032	102,219
Cash and cash equivalents at end of period	1,802,729	364,516	217,032
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	111,324	146,265	192,010
Taxes paid	6,028	2,732	1,303
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Investment in real estate mortgage receivable	0	0	(7,688)
Net assets transferred to Select Income REIT	0	0	492,736
(Decrease) increase in capital expenditures recorded as liabilities	(13,528)	7,690	(8,475)
Mortgage note payable and interest payable transferred in consensual foreclosure	$ 43,255	$ 0	$ 0

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Organization

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

Organization

Equity Commonwealth is a real estate investment trust, or REIT, formed in 1986 under the laws of the State of Maryland. Our primary business is the ownership and operation of real estate, primarily office buildings, throughout the United States. All number of properties, number of buildings and square feet are unaudited.

At December 31, 2015, our portfolio included the following (square feet in thousands):

	Number of Properties	Number of Buildings	Square Feet
Total portfolio	65	127	23,952

From July 2, 2013 through July 9, 2014 we also owned 22,000,000 common shares of Select Income REIT and its consolidated subsidiaries (SIR), and accounted for our investment in SIR under the equity method. On July 9, 2014, we sold our entire stake of 22,000,000 common shares of SIR. SIR was a 100% owned subsidiary of ours until March 12, 2012, on which date SIR completed an initial public offering of 9,200,000 of its common shares (SIR IPO), and became a publicly owned company with shares listed on the New York Stock Exchange (NYSE). On July 2, 2013, SIR issued and sold to the public 10,500,000 of its common shares. Prior to the completion of this offering, our 22,000,000 common shares of SIR represented approximately 56.0% of SIR's outstanding common shares, and SIR was one of our consolidated subsidiaries. Following the completion of this offering, our 22,000,000 common shares of SIR represented approximately 44.2% of SIR's outstanding common shares, and SIR ceased to be our consolidated subsidiary. See Notes 7 and 19 for additional information regarding SIR.

Until March 15, 2013, we also owned 9,950,000, or approximately 18.2%, of the common shares of Government Properties Income Trust (GOV). GOV was our wholly owned subsidiary until its initial public offering in June 2009, when it became a publicly owned company with shares listed on the NYSE. On March 15, 2013, we sold all shares that we owned of GOV. See Notes 7 and 19 for additional information regarding GOV.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation.    The consolidated financial statements include our investments in 100% owned subsidiaries and majority owned subsidiaries that are controlled by us. References to we, us, our and the Company, refer to Equity Commonwealth and its consolidated subsidiaries as of December 31, 2015, unless the context indicates otherwise. The portion of a consolidated subsidiary that is not controlled by us, or the noncontrolling interest, is presented as a separate component of equity in our consolidated balance sheets. In addition, net income attributable to the noncontrolling interest is presented separately in our consolidated statements of operations. All intercompany transactions and balances have been eliminated.

We account for our investments in 50% or less owned companies, including our investments in SIR (beginning on July 2, 2013 when SIR ceased to be our consolidated subsidiary through the sale date on July 9, 2014), GOV (until March 15, 2013, when we sold all of our GOV common shares) and Affiliates Insurance Company, or AIC (until May 9, 2014, when we sold all of our AIC shares), over which we can exercise influence, but do not control, using the equity method of accounting. We used the income statement method to account for issuance of common shares of beneficial interest by SIR and GOV, and shares of common stock by AIC. Under this method, gains and losses reflecting changes in the value of our investments at the date of issuance of additional common shares by SIR and GOV, or common stock by AIC, are recognized in our income statement.

Real Estate Properties.    We record real estate properties at cost. We depreciate real estate investments on a straight line basis over estimated useful lives of up to 40 years for buildings and improvements, and up to 12 years for personal property.

Each time we enter into a new lease, or materially modify an existing lease, we evaluate its classification as either a capital or operating lease. The classification of a lease as capital or operating affects the carrying value of a property, as well as our recognition of rental payments as revenue. These evaluations require us to make estimates of, among other things, the remaining useful life and fair market value of a leased property, appropriate discount rates and future cash flows.

We allocate the consideration paid for our properties among land, buildings and improvements and, for properties that qualify as acquired businesses under the Business Combinations Topic of the FASB Accounting Standards Codification™, or the Codification, to identified intangible assets and liabilities, consisting of the value of above market and below market leases, the value of acquired in place leases and the value of tenant relationships. Purchase price allocations and the determination of useful lives are based on our estimates and, under some circumstances, studies from independent real estate appraisal firms to provide market information and evaluations that are relevant to our purchase price allocations and determinations of useful lives; however, we are ultimately responsible for the purchase price allocations and determination of useful lives.

We allocate the consideration to land, buildings and improvements based on a determination of the fair values of these assets assuming the property is vacant. We determine the fair value of a property using methods that we believe are similar to those used by independent appraisers. Purchase price allocations to above market and below market leases are based on the estimated present value (using an interest rate which reflects our assessment of the risks associated with the leases acquired) of the difference between (1) the contractual amounts to be paid pursuant to the acquired in place leases and (2) our estimate of fair market lease rates for the corresponding leases, measured over a period equal to the remaining non-cancelable terms of the respective leases. Purchase price allocations to acquired in place leases and tenant relationships are determined as the excess of (1) the purchase price paid for a property after adjusting existing in place leases to estimated market rental rates over (2) the estimated fair value of the property as if vacant. We aggregate this value between acquired in place lease values and tenant relationships based on our evaluation of the specific characteristics of each tenant's lease; however, the value of tenant relationships has not been separated from acquired in place lease value for our properties because we believe such value and related amortization expense is immaterial for acquisitions reflected in our historical financial statements. We consider certain factors in performing these analyses including estimates of carrying costs during the expected lease up periods, including real estate taxes, insurance and other operating income and expenses and costs to execute similar leases in current market conditions, such as leasing commissions, legal and other related costs. If we believe the value of tenant relationships is material in the future, those amounts will be separately allocated and amortized over the estimated lives of the relationships. We recognize the excess, if any, of the consideration paid over amounts allocated to land, buildings and improvements and identified intangible assets and liabilities as goodwill and we recognize gains if amounts allocated exceed the consideration paid.

We amortize capitalized above market lease values (presented in our consolidated balance sheets as acquired real estate leases) as a reduction to rental income over the remaining terms of the respective leases. We amortize capitalized below market lease values (presented in our consolidated balance sheets as assumed real estate lease obligations) as an increase to rental income over the remaining terms of the respective leases. We amortize the value of acquired in place leases exclusive of the value of above market and below market acquired in place leases to expense over the remaining terms of the respective leases. If a lease is terminated prior to its stated expiration, the unamortized lease intangibles relating to that lease is written off.

We review our properties for impairment quarterly, or whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. Impairment indicators may include declining tenant occupancy, lack of progress releasing vacant space, tenant bankruptcies, low long term prospects for improvement in property performance, weak or declining tenant profitability, cash flow or liquidity, our decision to dispose of an asset before the end of its estimated useful life. When indicators of potential impairment are present that suggest that the carrying amounts of real estate assets may not be recoverable, we assess the recoverability of these assets by determining whether the respective carrying values will be recovered through the estimated undiscounted future operating cash flows expected from the use of the assets and their eventual disposition. The determination of undiscounted cash flow includes consideration of many factors including income to be earned from the investment, holding costs (exclusive of interest), estimated selling prices, and prevailing economic and market conditions. In the event that such expected undiscounted future cash flows do not exceed the carrying values, we estimate the fair value of the assets and record an impairment charge equal to the amount by which the carrying value exceeds the estimated fair value. Estimated fair values are calculated based on the following information, (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of future cash flows. During the years ended December 31, 2015 and 2014, we recorded a loss on asset impairment in continuing operations totaling $17.2 million and $185.1 million, respectively, to reduce the carrying value of properties to their estimated fair values (see Note 16).

When we classify properties as held for sale, we discontinue the recording of depreciation expense and estimate their fair value less costs to sell. If we determine that the carrying value for these properties exceed their estimated fair value less costs to sell, we record a loss on asset impairment. During the year ended December 31, 2013, we recorded a loss on asset impairment of $79.8 million in discontinued operations and a loss on asset impairment of $124.3 million in continuing operations to reduce the carrying value of 39 properties (93 buildings) classified as held for sale to their estimated fair value less costs to sell. In addition, we recorded losses on asset impairment for properties sold during 2013 totaling $23.1 million.

Certain of our real estate assets contain hazardous substances, including asbestos. We believe any asbestos in our buildings is contained in accordance with current regulations, and we have no current plans to remove any such asbestos. If we remove the asbestos or renovate or demolish these properties, certain environmental regulations govern the manner in which the asbestos must be handled and removed. We do not believe that there are other environmental conditions at any of our properties that have a material adverse effect on us. However, no assurances can be given that such conditions are not present in our properties or that other costs we incur to remediate contamination will not have a material adverse effect on our business or financial condition. As of December 31, 2015, we did not have any accrued environmental remediation costs. As of December 31, 2014, accrued environmental remediation costs by us totaling $0.5 million were included in accounts payable and accrued expenses in our consolidated balance sheets.

Cash and Cash Equivalents.    Our cash and cash equivalents consists of cash maintained in time deposits, depository accounts and money market accounts.  From time-to-time we may also invest in various U.S. government securities.  We continually monitor the credit ratings of the financial institutions holding our deposits to minimize our exposure to credit risk.  Throughout the year, we have cash balances in excess of federally insured limits deposited with various financial institutions. We do not believe we are exposed to any significant credit risk on cash and cash equivalents.

Restricted Cash.    Restricted cash consists of amounts escrowed for future real estate taxes, insurance, leasing costs, capital expenditures and debt service, as required by some of our mortgage debts, as well as security deposits paid to us by some of our tenants.

Other Assets, Net.    Other assets consist principally of deferred financing fees, deferred leasing costs, capitalized lease incentives and prepaid property operating expenses. Deferred financing fees include issuance costs related to borrowings and are capitalized and amortized over the terms of the respective loans. Deferred leasing costs include brokerage, legal and other fees associated with the successful negotiation of leases and are amortized on a straight line basis over the terms of the respective leases. Capitalized lease incentives are amortized on a straight line basis against rental income over the terms of the respective leases.

Accounting Policy for Derivative Instruments.    The Derivatives and Hedging Topic of the Codification requires companies to recognize all their derivative instruments as either assets or liabilities in the statement of financial position at fair value. The accounting for changes in the fair value of a derivative instrument depends on whether such instrument has been designated and qualifies as part of a hedging relationship and, further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, we must designate the hedging instrument, based upon the exposure being hedged, as a fair value hedge, cash flow hedge or a hedge of a net investment in a foreign operation. In December 2009, we entered into interest rate swap agreements that qualify as cash flow hedges.

We are exposed to certain risks relating to our ongoing business operations. The primary risk managed by using derivative instruments is interest rate risk. Interest rate swaps are entered into to manage interest rate risk associated with our floating rate borrowings. We designate interest rate swaps as cash flow hedges of floating rate borrowings.

Revenue Recognition.    Rental income from operating leases, which includes rent concessions (including free rent and other lease incentives) and scheduled increases in rental rates during the lease term, is recognized on a straight line basis over the life of the lease agreements. We defer the recognition of contingent rental income, such as percentage rents, until the specific targets that trigger the contingent rental income are achieved. Tenant reimbursements and other income includes property level operating expenses reimbursed by our tenants, as well as other incidental revenues, which are recorded as expenses are incurred.

Allowance for Doubtful Accounts.    We maintain an allowance for doubtful accounts for estimated losses resulting from the inability or unwillingness of certain tenants to make payments required under their leases. The computation of the allowance is based on the tenants' payment histories and current credit profiles, as well as other considerations.

Share-Based Compensation. All share-based compensation is measured at fair value on the grant date or date of modification, as applicable, and recognized in earnings over the requisite service period. Depending upon the settlement terms of the awards, all or a portion of the fair value of share-based awards may be presented as a liability or as equity in the consolidated balance sheets.

Earnings Per Common Share.    Earnings per common share, or EPS, is computed using the weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if our series D convertible preferred shares or our restricted share units (RSUs) were converted into our common shares, which could result in a lower EPS amount. The effect of our series D convertible preferred shares on income from continuing operations and net income attributable to common shareholders is anti-dilutive for all periods presented.

Reclassifications.    Reclassifications have been made to the prior years' financial statements and notes to conform to the current year's presentation.

Income Taxes.    We are a REIT under the Internal Revenue Code of 1986, as amended, and are generally not subject to federal and state income taxes provided we distribute our taxable income to our shareholders and meet other requirements for qualifying as a real estate investment trust. However, we are subject to certain state and local taxes without regard to our REIT status.

The Income Taxes Topic of the Codification prescribes how we should recognize, measure and present in our financial statements uncertain tax positions that have been taken or are expected to be taken in a tax return. Deferred tax assets are recognized to the extent that it is "more likely than not" that a particular tax position will be sustained upon examination or audit. To the extent the "more likely than not" standard has been satisfied, the benefit associated with a tax position is measured as the largest amount that has a greater than 50% likelihood of being realized upon settlement. We classify interest and penalties related to uncertain tax positions, if any, in our financial statements as a component of general and administrative expense.

Use of Estimates.    Preparation of these financial statements in conformity with U.S. generally accepted accounting principles, or GAAP, requires us to make estimates and assumptions that may affect the amounts reported in these financial statements and related notes. The actual results could differ from these estimates.

Foreign Operations.    During the year ended December 31, 2015, we sold our Australian properties (Note 4) and as of December 31, 2015, we do not have any foreign operations. The U.S. dollar was the functional currency for our consolidated subsidiaries operating in the United States prior to the sale of the Australian portfolio. The functional currency for our consolidated subsidiaries in countries other than the United States was the principal currency in which the entity's assets, liabilities, income and expenses were denominated. The functional currency of our consolidated subsidiary that operated in Australia was the Australian dollar. We translated our Australian subsidiary's financial statements into U.S. dollars when we consolidated that subsidiary's financial statements on a quarterly basis. Generally, we translated assets and liabilities at the exchange rate in effect as of the balance sheet date. The resulting translation adjustments were included in cumulative other comprehensive loss in our consolidated balance sheets. We translated income statement accounts using the average exchange rate for the period and income statement accounts that include significant non-recurring transactions at the rate in effect as of the date of the transaction. We were subject to foreign currency risk due to potential fluctuations in exchange rates between Australian and U.S. currencies.

Subsequent to the disposition of the Australian properties, we recognized a foreign currency exchange loss of $8.9 million in our consolidated statement of operations for the year ended December 31, 2015. The foreign currency exchange loss for the year ended December 31, 2015 relates to the change in foreign currency rates resulting in losses on cash proceeds from the Australian portfolio disposition maintained in an Australian bank account prior to the transfer of cash from our Australian subsidiary to our U.S bank accounts. As of December 31, 2015, we did not have any cumulative foreign currency translation adjustments as the cumulative foreign currency translation adjustment of $63.2 million was reclassified from other comprehensive loss to earnings upon disposition of the Australian properties. As of December 31, 2014, cumulative foreign currency translation adjustments were $(48.9) million.

New Accounting Pronouncements. In April 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, or ASU 2014-08.  ASU 2014-08 changes the criteria for reporting a discontinued operation.  Under the new pronouncement, a disposal of a part of an organization that has a major effect on its operations and financial results is a discontinued operation.  We adopted ASU 2014-08 on January 1, 2015, and determined that our 2015 dispositions do not individually represent a strategic shift, as defined by the standard, that has or will have a major effect on our operations and financial results. As a result, the 2015 dispositions have not been presented as discontinued operations in the 2015 statements of operations.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which provides guidance for revenue recognition. This update is effective for interim and annual reporting periods beginning after December 15, 2017.  We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs. This standard amends existing guidance to require the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of as a deferred charge. It is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. We do not expect that the adoption of this standard will have a material impact on our consolidated financial statements.

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Board of Trustees

12 Months Ended

Dec. 31, 2015

Board of Trustees

Board of Trustees

Board of Trustees

On March 18, 2014, Related Fund Management, LLC (Related) and Corvex Management LP (Corvex) together, (Related/Corvex), delivered written consents which they represented were from a sufficient number of holders of our outstanding common shares to remove all of our then Trustees (former Trustees) and any other person or persons elected or appointed to our Board of Trustees prior to the effective time of the Related/Corvex removal proposal. After inspection, our then Board of Trustees determined that holders of more than two-thirds of our outstanding common shares as of the February 18, 2014, record date consented to the Related/Corvex proposal, reaching the threshold required to remove all of our then Trustees and any other person or persons appointed as a Trustee prior to the effective time of the Related/Corvex removal proposal. Accordingly, on March 25, 2014, all of our former Trustees certified their removal as Trustees of EQC.

On May 23, 2014, at a special meeting of our shareholders (Special Meeting), the following seven individuals were elected to serve on our Board of Trustees: Sam Zell, who serves as the Chairman of the new Board of Trustees, James S. Corl, Edward A. Glickman, David A. Helfand, Peter Linneman, James L. Lozier, Jr. and Kenneth Shea.  Each of the foregoing individuals was nominated to serve on the new Board of Trustees by Related/Corvex. On July 31, 2014, our shareholders re-elected the seven individuals listed above and elected Martin L. Edelman, Mary Jane Robertson, Gerald A. Spector and James A. Star to serve on our Board of Trustees, bringing our total number of Trustees to eleven (new Board of Trustees). At the 2015 annual meeting of shareholders held on June 16, 2015, our shareholders re-elected each of our eleven Trustees to serve on our Board of Trustees for the 2015-2016 term.

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Real Estate Properties

12 Months Ended

Dec. 31, 2015

Real Estate [Abstract]

Real Estate Properties

Real Estate Properties

The information presented in this Note 4 excludes information related to SIR and its consolidated subsidiaries, unless the context indicates otherwise.

We did not make any acquisitions during the years ended December 31, 2015, or 2014.

During the years ended December 31, 2015, 2014, and 2013, we made improvements, excluding tenant-funded improvements, to our properties totaling $75.7 million, $91.6 million and $122.9 million, respectively. Improvements made during the year ended December 31, 2013, include improvements made by SIR to its properties for the period that SIR was our consolidated subsidiary until July 2, 2013.

We committed $156.4 million for expenditures related to 4,900,000 square feet of leases executed during 2015. Committed but unspent tenant related obligations, including leasing commissions and tenant improvements, based on existing leases as of December 31, 2015, were $118.9 million.

Properties Held For Sale:

We classify all properties that meet the criteria outlined in the Property, Plant and Equipment Topic of the FASB Accounting Standards Codification (Codification) as held for sale on our consolidated balance sheets.  During March 2014, the former management team ceased to actively market 31 properties (67 buildings) with a combined 5,641,450 square feet that we had previously classified as held for sale as of December 31, 2013.  These properties were not under agreement for sale when our former Trustees were removed in March 2014.  These properties were reclassified to properties held and used in operations because they no longer met the requirements under GAAP for classification as held for sale.  Operating results for these properties were reclassified from discontinued operations to continuing operations for all periods presented herein.  In connection with this reclassification, we reversed previously recorded impairment losses totaling $4.8 million, which included the elimination of estimated costs to sell. As of December 31, 2015, and 2014, we had no properties classified as held for sale.

Property Dispositions:

During the year ended December 31, 2015, we disposed of the following properties (dollars in thousands):

Asset	Date Disposed	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
Properties
11350 North Meridian Street	January 2015	1	1	72,264	$	4,200	$	766
333 Laurel Oak Drive(1)	March 2015	—	1	27,164	2,450		251
1921 E. Alton Avenue	March 2015	1	1	67,846	14,533		4,851
46 Inverness Center Parkway	April 2015	—	—	—	2,000		1,857
225 Water Street(2)	May 2015	1	1	318,997	—		—
Sorrento Valley Business Park	June 2015	1	4	105,003	23,500		11,896
Illinois Center	August 2015	1	2	2,090,162	376,000		26,956
16th and Race Street	August 2015	1	1	608,625	43,000		7,922
185 Asylum Street	September 2015	1	1	868,395	113,250		17,619
One South Church Avenue	October 2015	1	1	240,811	32,000		4,282
775 Ridge Lake Boulevard	October 2015	1	1	120,678	16,300		(360		)
One Park Square	October 2015	1	6	259,737	34,300		9,512
Arizona Center	December 2015	1	4	1,070,724	126,000		22,838
4 South 84th Avenue	December 2015	1	1	236,007	18,000		8,393
Portfolio of properties
7450 Campus Drive	May 2015	1	1	77,411
129 Worthington Ridge Road	May 2015	1	1	227,500
599 Research Parkway	May 2015	1	1	48,249
181 Marsh Hill Road	May 2015	1	1	162,036
101 Barnes Road	May 2015	1	1	45,755
15 Sterling Drive	May 2015	1	1	173,015
35 Thorpe Avenue	May 2015	1	1	79,862
50 Barnes Industrial Road North	May 2015	1	1	154,255
5-9 Barnes Industrial Road	May 2015	1	1	38,006
860 North Main Street	May 2015	1	1	31,165
One Barnes Industrial Road South	May 2015	1	1	30,170
Village Lane	May 2015	1	2	58,185
100 Northfield Drive	May 2015	1	1	116,986
905 Meridian Lake Drive	May 2015	1	1	74,652
1717 Deerfield Road	May 2015	1	1	141,186
1955 West Field Court	May 2015	1	1	59,130
5015 S. Water Circle	May 2015	1	1	113,524
Adams Place	May 2015	1	2	230,259
Cabot Business Park	May 2015	1	2	252,755
2300 Crown Colony Drive	May 2015	1	1	45,974
Myles Standish Industrial Park	May 2015	1	2	74,800
340 Thompson Road	May 2015	1	1	25,000
100 South Charles Street	May 2015	1	1	159,616
6710 Oxon Hill	May 2015	1	1	118,336
8800 Queen Avenue South	May 2015	1	1	280,822

Asset	Date Disposed	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
9800 Sherlard Parkway	May 2015	1	1	46,765
Rosedale Corporate Plaza	May 2015	1	3	149,116
1000 Shelard Parkway	May 2015	1	1	62,499
525 Park Street	May 2015	1	1	75,636
1900 Meyer Drury Drive	May 2015	1	1	65,225
131-165 West Ninth Street	May 2015	1	1	75,517
7-9 Vreeland Road	May 2015	1	1	155,891
5 Paragon Drive	May 2015	1	1	119,089
1000 Voorhees Drive and 400 Laurel Oak Drive(1)	May 2015	1	2	125,415
1601 Veterans Highway	May 2015	1	1	63,608
Two Corporate Center Drive	May 2015	1	1	291,230
11311 Cornell Park Drive	May 2015	1	1	93,413
5300 Kings Island Drive	May 2015	1	1	159,421
3 Crown Point Court	May 2015	1	1	73,987
515 Pennsylvania Avenue	May 2015	1	1	82,000
443 Gulph Road	May 2015	1	1	21,000
4350 Northern Pike	May 2015	1	1	503,885
Thunderbolt Place	May 2015	1	2	100,505
6160 Kempsville Circle	May 2015	1	1	129,565
448 Viking Drive	May 2015	1	1	75,374
Portfolio of small office and industrial assets		45	53	5,287,790	$	376,000	$	(8,160	)
2501 20th Place South	June 2015	1	1	125,722
420 20th Street North	June 2015	1	1	514,893
Inverness Center	June 2015	1	4	475,882
701 Poydras Street	June 2015	1	1	1,256,971
300 North Greene Street	June 2015	1	1	324,305
1320 Main Street	June 2015	1	1	334,075
AL, LA, NC, SC office portfolio		6	9	3,031,848	$	417,450	$	41,596
12655 Olive Boulevard	June 2015	1	1	98,588
1285 Fern Ridge Parkway	June 2015	1	1	66,510
St. Louis portfolio(3)		2	2	165,098	$	14,300	$	(2,349	)
310-314 Invermay Road(4)	April 2015	1	1	47,480
253-293 George Town Road(4)	April 2015	1	1	143,914
7 Modal Crescent	June 2015	1	1	164,160
71-93 Whiteside Road	June 2015	1	1	303,488
9-13 Titanium Court	June 2015	1	1	69,664
16 Rodborough Road	June 2015	1	1	90,525
22 Rodborough Road	June 2015	1	1	43,427
127-161 Cherry Lane	June 2015	1	1	278,570
310-320 Pitt Street	June 2015	1	1	313,865

Asset	Date Disposed	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
44-46 Mandarin Street	June 2015	1	1	226,718
19 Leadership Way	June 2015	1	1	76,714
Australia portfolio(5)		11	11	1,758,525	$	232,955	$	(47,872	)
Widewaters Parkway	August 2015	1	8	514,241
5062 Brittonfield Parkway	August 2015	1	1	40,162
Woodcliff Drive	August 2015	1	6	516,760
Interstate Place	August 2015	1	2	61,399
1000 Pittsford - Victor Road	August 2015	1	1	73,358
1200 Pittsford - Victor Road	August 2015	1	1	18,900
Corporate Crossing	August 2015	1	5	216,126
Canal View Boulevard	August 2015	1	3	118,375
14 Classic Street	August 2015	1	1	37,084
110 W Fayette Street	August 2015	1	1	304,906
251 Salina Meadows Parkway	August 2015	1	1	65,617
Upstate New York portfolio(3)		11	30	1,966,928	$	104,625	$	(12,518	)
9040 Roswell Road	October 2015	1	1	178,941
The Exchange	October 2015	1	2	187,632
3920 Arkwright Road	October 2015	1	1	196,156
1775 West Oak Commons Court	October 2015	1	1	79,854
Georgia portfolio(3)		4	5	642,583	$	48,550	$	(3,059	)
		91	135	18,939,185	$	1,999,413	$	84,421

(1) This property contains three buildings. We sold one building in March 2015 and two buildings in May 2015.

(2) Title to this property was transferred to the lender pursuant to a consensual foreclosure in full satisfaction of the mortgage debt with a principal balance of $40.1 million, resulting in a gain on early extinguishment of debt of $17.3 million for the year ended December 31, 2015. See Note 9 for additional information.

(3) Prior to the disposition of these properties, we recorded a total impairment charge of $17.2 million during the year ended December 31, 2015, based upon updated market information in accordance with our impairment analysis procedures.

(4) These properties were sold in a separate transaction to a different buyer than other Australian properties.

(5) The loss on sale includes a $63.2 million cumulative foreign currency translation adjustment reclassified from cumulative other comprehensive loss due to the disposition of the Australian portfolio.

During the years ended December 31, 2014 and 2013, we sold the following properties (dollars in thousands):

Date Sold	Number of Properties	Number of Buildings	Square Footage	Sales Price		Gain (Loss) on Sale
Sales of properties resulting in gains and losses
December 2013	3	40	1,670,104	$	89,000	$	(25,521	)
June 2013(6)	—	—	—	2,551		1,765
June 2013	1	1	30,105	1,600		317
March 2013(6)	—	—	—	1,806		1,596
January 2013(7)	3	18	1,060,026	10,250		1,277
	7	59	2,760,235	$	105,207	$	(20,566	)
Sales of properties with previously recorded asset impairment losses:
June 2014(8)	14	43	2,784,098	$	215,900
December 2013	2	2	77,394	$	2,020
November 2013	18	21	2,125,278	50,500
October 2013	1	2	199,418	4,000
October 2013	1	1	665,545	13,900
October 2013	9	41	1,211,536	43,000
August 2013	1	3	129,452	4,100
June 2013	1	1	143,802	5,250
June 2013	1	2	356,045	16,300
May 2013	1	1	57,250	4,025
April 2013	1	1	618,000	830
	36	75	5,583,720	$	143,925

(6) We sold a land parcel.

(7) We provided mortgage financing to the buyer, an unrelated third party, totaling $7.7 million at 6.0% per annum (Note 8).

(8) In connection with this transaction, we recognized a loss on asset impairment of $2.2 million and a loss on early extinguishment of debt of $3.3 million for the year ended December 31, 2014.  The sales price excludes mortgage debt repayments. These properties are included in income from discontinued operations for all years presented.

Results of operations for properties sold prior to December 31, 2014, are included in discontinued operations in our consolidated statements of operations. Summarized income statement information for properties included in discontinued operations is as follows (in thousands):

	Year Ended December 31,
	2014			2013
Rental income	$	14,243		$	55,073
Tenant reimbursements and other income	1,900			6,842
Total revenues	16,143			61,915
Operating expenses	7,138			37,027
Depreciation and amortization	—			12,550
General and administrative	10			4,268
Total expenses	7,148			53,845
Operating income	8,995			8,070
Interest and other income	2			65
Interest expense	(608		)	(1,742		)
Income from discontinued operations	$	8,389		$	6,393

Lease Payments

Our real estate properties are generally leased on gross lease, modified gross lease or triple net lease bases pursuant to non-cancelable, fixed term operating leases expiring between 2016 and 2033. Our triple net leases generally require the lessee to pay all property operating costs. Our gross leases and modified gross leases require us to pay all or some property operating expenses and to provide all or some property management services. A portion of these property operating expenses are reimbursed by the tenants.

The future minimum lease payments, excluding tenant reimbursement revenue, scheduled to be received by us during the current terms of our leases as of December 31, 2015 are as follows (in thousands):

2016	$	400,987
2017	380,501
2018	353,286
2019	313,563
2020	275,406
Thereafter	1,175,661
	$	2,899,404

One of our real estate properties, 111 River Street in Hoboken, New Jersey, is subject to a ground lease. The land on this property is leased pursuant to a non-cancelable, fixed term operating ground lease that expires in 2098.

The future minimum lease payments scheduled to be paid by us during the current terms of this ground lease under which we are the lessee, as of December 31, 2015, are as follows (in thousands):

2016	$	1,477
2017	1,477
2018	1,483
2019	1,503
2020	1,503
Thereafter	128,491
	$	135,934

The amount of ground lease expense included in operating expenses during the years ended December 31, 2015, 2014 and 2013, totaled $1.8 million, $1.8 million and $1.9 million, respectively. Ground lease expense includes percentage rent.

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Lease Intangibles

12 Months Ended

Dec. 31, 2015

Leases [Abstract]

Leases Intangibles

Lease Intangibles

The following table summarizes the carrying amounts for our acquired real estate leases and assumed real estate lease obligations as of December 31, 2015, and 2014, and (in thousands):

	December 31,
	2015			2014
Acquired in-place leases	$	147,056		$	272,077
Acquired above market leases	78,210			121,969
Acquired real estate leases	225,266			394,046
Accumulated amortization, acquired in-place leases	(91,301		)	(136,089		)
Accumulated amortization, acquired above market leases	(45,205		)	(59,670		)
Acquired real estate leases, net	$	88,760		$	198,287
Acquired below market leases	19,742			56,541
Accumulated amortization	(15,446		)	(29,757		)
Assumed real estate lease obligations, net	$	4,296		$	26,784

Amortization of the lease intangibles for the years ended December 31, 2015, 2014, and 2013, is as follows (in thousands):

		December 31,
	Income Statement Location	2015			2014			2013
Amortization of acquired in-place leases	Depreciation and amortization	$	26,787		$	40,493		$	48,023
Amortization of acquired in-place leases	Discontinued operations	—			—			1,720
Amortization of above and below market leases	Increase (decrease) to rental income	(7,515		)	(10,650		)	(10,310		)
Amortization of above and below market leases	Discontinued operations	—			—			775

Future amortization of net intangible lease assets and liabilities to be recognized by us during the current terms of our leases as of December 31, 2015, are approximately (in thousands):

2016	$	18,054
2017	15,213
2018	12,619
2019	8,778
2020	7,535
Thereafter	22,265
	$	84,464

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Investment in Direct Financing Lease

12 Months Ended

Dec. 31, 2015

Capital Leases, Net Investment in Direct Financing Leases [Abstract]

Investment in Direct Financing Lease

Investment in Direct Financing Lease

We had an investment in a direct financing lease that related to a lease with a term that exceeded 75% of the useful life of an office tower located within a mixed use property in Phoenix, AZ.  In December 2015, we sold this property. Prior to the sale of the property, we recognized income using the effective interest method to produce a level yield on funds not yet recovered.  The carrying amount of our net investment of $12.5 million as of December 31, 2014, is included in other assets in our consolidated balance sheets. 

We monitored the payment history and credit profile of the tenant and have determined that no allowance for losses related to our direct financing lease was necessary at December 31, 2014.

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Equity Investments

12 Months Ended

Dec. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Equity Investments

Equity Investments

At December 31, 2015, and 2014, we did not have any ownership interests in equity investments. For the years ended December 31, 2014, and 2013, equity in earnings is as follows (in thousands):

	Year Ended December 31,
	2014			2013
SIR	$	24,516		$	21,153
GOV	—			4,111
AIC	(56		)	490
	$	24,460		$	25,754

Investment in SIR

SIR was one of our consolidated subsidiaries until July 2, 2013 and was an unconsolidated equity investment from July 2, 2013 until July 9, 2014. On July 9, 2014, we sold our entire stake of 22,000,000 common shares of SIR. We received $704.8 million in cash representing $32.04 per share and recognized a gain on sale of equity investment of $171.8 million in our consolidated statement of operations. Proceeds from this sale were used to repay our revolving credit facility and certain mortgage loans (Note 9). As a result of this sale, we no longer hold any interest in SIR.

During the second quarter of 2014, SIR issued 10,000,000 common shares in a public offering for $29.00 per common share, raising net proceeds (after deducting underwriters’ discounts and commissions and expenses) of approximately $277.4 million.  We recognized a gain on this sale by an equity investee of $16.9 million as a result of the per share sales price of this transaction being above our per share carrying value.  Our ownership percentage in SIR was reduced to 36.7% as a result of the transaction.

On July 2, 2013, SIR issued and sold to the public 10,500,000 of its common shares for $28.25 per common share. Prior to the completion of this offering, our 22,000,000 common shares of SIR represented approximately 56.0% of SIR's outstanding common shares, and SIR was one of our consolidated subsidiaries. Following the completion of this offering, our 22,000,000 common shares of SIR represented approximately 44.2% of SIR's outstanding common shares and SIR ceased to be our consolidated subsidiary.

Accordingly, after the completion of this offering on July 2, 2013, we no longer consolidated our investment in SIR, but instead accounted for this investment under the equity method. Under the equity method, we recorded our percentage share of net earnings of SIR in our consolidated statements of operations. Prior to July 2, 2013, the operating results and investments of SIR were included in our consolidated results of operations and financial position. On July 2, 2013, our share of the underlying equity of SIR exceeded our carrying value by $17.6 million. As required under GAAP, we amortized this difference to equity in earnings of investees over a 34 year period, which approximates the average remaining useful lives of the buildings owned by SIR as of July 2, 2013. See Notes 1 and 19 for additional information regarding SIR.

For the period from January 1, 2014, through July 9, 2014, we received cash distributions from SIR totaling $20.7 million.

For the period from July 2, 2013, through December 31, 2013, we received cash distributions from SIR totaling $19.8 million.

The following unaudited summarized income statement information of SIR for the period from January 1, 2014, through July 9, 2014, and for the year ended December 31, 2013, is as follows (in thousands, except per share data):

	For the Period from January 1, 2014 through July 9, 2014			Year Ended December 31, 2013
Rental income	98,226			$	159,011
Tenant reimbursements and other income	16,980			29,312
Total revenues	115,206			188,323
Operating expenses	20,982			36,382
Depreciation and amortization	20,832			31,091
Acquisition related costs	374			2,002
General and administrative	7,731			12,423
Total expenses	49,919			81,898
Operating income	65,287			106,425
Interest expense	(7,287		)	(13,763		)
Gain on early extinguishment of debt	243			—
Income before income tax expense and equity in earnings of an investee	58,243			92,662
Income tax expense	(90		)	96
Equity in earnings of an investee	32			334
Net income	$	58,185		$	93,092
Weighted average common shares outstanding	52,394			44,565
Net income per common share	$	1.11		$	2.09

Investment in GOV

On March 15, 2013, we sold all 9,950,000 common shares that we owned of GOV in a public offering for $25.20 per common share, raising gross proceeds of $250.7 million ($239.6 million after deducting underwriters' discounts and commissions and expenses). We recognized a gain on this sale of an equity investment of $66.3 million as a result of the per share sales price of this transaction being above our per share carrying value. GOV was our wholly owned subsidiary until its initial public offering in June 2009 when it became a separate public entity.

During the year ended December 31, 2013, we received cash distributions from GOV totaling $4.3 million. We no longer own any interest in GOV.

Investment in AIC

As of May 9, 2014, we had a net investment of $5.8 million in AIC, an insurance company that was owned in equal proportion by us, our former manager Reit Management & Research LLC (RMR), SIR and five other companies to which RMR provides management services.  On May 9, 2014, as a result of the removal of the former Trustees and in accordance with the terms of the shareholder agreement between us and the other AIC shareholders, the other AIC shareholders exercised their right to purchase all of the 20,000 shares of AIC we then owned.  We received $5.8 million in aggregate proceeds from this sale.  We no longer own any interest in AIC.  

Our participation in the AIC property insurance program expired in June 2014.  See Note 19 for additional information about our investment in AIC.

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Other Assets

12 Months Ended

Dec. 31, 2015

Other Assets [Abstract]

Other Assets

Other Assets

Real Estate Mortgages Receivable

As of December 31, 2015, and 2014, we had total real estate mortgages receivable with an aggregate carrying value of $8.1 million included in other assets in our consolidated balance sheets.  We provided mortgage financing totaling $7.7 million at 6.0% per annum in connection with our sale of three properties (18 buildings) in January 2013 in Dearborn, MI; this real estate mortgage requires monthly interest payments and matures on January 24, 2023.  We also provided mortgage financing totaling $0.4 million at 6.0% per annum in connection with our sale of a property in Salina, NY in April 2012. This real estate mortgage requires monthly interest payments and matures on April 30, 2019. In addition, in September 2013, another buyer of a property we sold prepaid to us in full a $1.0 million real estate mortgage that was scheduled to mature on July 1, 2017.

We monitor the payment history of the borrowers and have determined that no allowance for losses related to these real estate mortgages receivable were necessary at December 31, 2015, and 2014. 

Deferred Financing Fees, Deferred Leasing Costs and Capitalized Lease Incentives

The following table summarizes our deferred financing fees, deferred leasing costs and capitalized lease incentives as of December 31, 2015, and 2014 (in thousands):

	December 31,
	2015			2014
Deferred financing fees	$	43,346		$	41,339
Accumulated amortization	(25,158		)	(24,478		)
Deferred financing fees, net	$	18,188		$	16,861
Deferred leasing costs	$	166,390		$	184,600
Accumulated amortization	(56,162		)	(58,348		)
Deferred leasing costs, net	$	110,228		$	126,252
Capitalized lease incentives	$	11,623		$	22,650
Accumulated amortization	(2,498		)	(7,459		)
Capitalized lease incentives, net	$	9,125		$	15,191

Future amortization of deferred leasing costs and capitalized lease incentives to be recognized by us during the current terms of our leases as of December 31, 2015 are approximately (in thousands):

	Deferred Leasing Costs		Capitalized Lease Incentives
2016	$	15,933	$	1,528
2017	14,870		1,477
2018	13,369		779
2019	12,246		704
2020	10,324		608
Thereafter	43,486		4,029
	$	110,228	$	9,125

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Indebtedness

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Indebtedness

Indebtedness

At December 31, 2015 and 2014, our outstanding indebtedness included the following (in thousands):

					December 31,
	Interest Rate at December 31, 2015			Maturity Date	2015			2014
Unsecured revolving credit facility, at LIBOR plus a premium	1.68	%		1/28/2019	$	—		$	—
5-year unsecured term loan, at LIBOR plus a premium	1.83	%		1/28/2020	200,000			—
7-year unsecured term loan, at LIBOR plus a premium	2.23	%		1/28/2022	200,000			—
Unsecured term loan, at LIBOR plus a premium	—	%		—	—			400,000
Unsecured floating rate debt	2.03	%	(1)		$	400,000		$	400,000
5.75% Senior Unsecured Notes due 2015	—	%		—	$	—		$	138,773
6.25% Senior Unsecured Notes due 2016	6.25	%		8/15/2016	139,104			139,104
6.25% Senior Unsecured Notes due 2017	6.25	%		6/15/2017	250,000			250,000
6.65% Senior Unsecured Notes due 2018	6.65	%		1/15/2018	250,000			250,000
5.875% Senior Unsecured Notes due 2020	5.88	%		9/15/2020	250,000			250,000
5.75% Senior Unsecured Notes due 2042	5.75	%		8/1/2042	175,000			175,000
Unsecured fixed rate debt	6.17	%	(1)		$	1,064,104		$	1,202,877
111 Monument Circle	—	%		—	$	—		$	116,000
225 Water Street	—	%		—	—			40,059
111 East Wacker Drive	—	%		—	—			142,666
2501 20th Place South	—	%		—	—			10,267
Parkshore Plaza	5.67	%		5/1/2017	41,275			41,275
1735 Market Street(2)	5.66	%		12/2/2019	169,612			171,498
206 East 9th Street	5.69	%		1/5/2021	27,515			27,965
1320 Main Street	—	%		—	—			38,979
33 Stiles Lane	6.75	%		3/1/2022	2,785			3,132
97 Newberry Road	5.71	%		3/1/2026	6,375			6,819
Secured fixed rate debt	5.68	%	(1)		$	247,562		$	598,660
					$	1,711,666		$	2,201,537
Unamortized net premiums and discounts					(1,342		)	6,128
					$	1,710,324		$	2,207,665

(1) Represents weighted average interest rate at December 31, 2015.

(2) Interest on this loan is payable at LIBOR plus 2.625% but has been fixed for the first seven years to December 1, 2016 by a cash flow hedge which sets the rate at approximately 5.66%.

Unsecured Revolving Credit Facility and Term Loan:

Prior to January 29, 2015, we had a $750.0 million unsecured revolving credit facility. The unsecured revolving credit facility was set to mature on October 19, 2015, and had an interest rate of LIBOR plus a spread, which was 150 basis points as of December 31, 2014.  We paid a facility fee of 35 basis points per annum on the total amount of lending commitments under our revolving credit facility.  Prior to January 29, 2015, we also had a $500.0 million unsecured term loan that was set to mature on December 15, 2016.  Our term loan had an interest rate of LIBOR plus a spread, which was 185 basis points as of December 31, 2014. On December 5, 2014, we paid $100.0 million of our unsecured term loan, reducing our term loan borrowings to $400.0 million.

On January 29, 2015, we entered into a new credit agreement, pursuant to which the lenders agreed to provide (i) a $750.0 million unsecured revolving credit facility, (ii) a $200.0 million5-year term loan facility and (iii) a $200.0 million7-year term loan facility. The new agreement replaced our prior credit agreement, dated as of August 9, 2010, and our prior term loan agreement, dated as of December 16, 2010.  In connection with the new agreement, we recognized a loss on early extinguishment of debt of $0.4 million from the write-off of unamortized deferred financing fees for the year ended December 31, 2015. The revolving credit facility has a scheduled maturity date of January 28, 2019, which maturity date may be extended for up to two additional periods of six months at our option subject to satisfaction of certain conditions and the payment of an extension fee of 0.075% of the aggregate amount available under the revolving credit facility. The 5-year term loan and the 7-year term loan have scheduled maturity dates of January 28, 2020 and January 28, 2022, respectively. We used the proceeds of borrowings under the credit agreement to repay all amounts outstanding and due under the previous term loan agreement.

The credit agreement permits us to utilize up to $100.0 million of the revolving credit facility for the issuance of letters of credit. Amounts outstanding under the credit agreement generally may be prepaid at any time without premium or penalty, subject to certain exceptions. We have the right to request increases in the aggregate maximum amount of borrowings available under the revolving credit facility and term loans up to an additional $1.15 billion, subject to certain conditions.

Borrowings under the 5-year term loan and 7-year term loan will, subject to certain exceptions, bear interest at a LIBOR rate plus a margin of 90 to 180 basis points for the 5-year term loan and 140 to 235 basis points for the 7-year term loan, in each case depending on our credit rating. Borrowings under the revolving credit facility will, subject to certain exceptions, bear interest at a rate equal to, at our option, either a LIBOR rate or a base rate plus a margin of 87.5 to 155 basis points for LIBOR rate advances and 0 to 55 basis points for base rate advances, in each case depending on our credit rating. In addition, we are required to pay a facility fee of 12.5 to 30 basis points, depending on our credit rating, on the borrowings available under the revolving credit facility, whether or not utilized.

Borrowings under our revolving credit facility currently bear interest at LIBOR plus a spread, which was 125 basis points as of December 31, 2015.  As of December 31, 2015, the interest rate payable on borrowings under our revolving credit facility was 1.68%.  As of December 31, 2015, we had no balance outstanding and $750.0 million available under our revolving credit facility. Our term loans currently bear interest at a rate of LIBOR plus a spread, which was 140 and 180 basis points for the 5-year and 7-year term loan, respectively, as of December 31, 2015.  As of December 31, 2015, the interest rates for the amounts outstanding under our 5-year term loan and 7-year term loan were 1.83% and 2.23%, respectively.  As of December 31, 2015, we had $200.0 million outstanding under each of our 5-year and 7-year term loans.

Debt Covenants:

Our public debt indenture and related supplements, our revolving credit facility agreement and our term loan agreement contain a number of financial and other covenants, including covenants that restrict our ability to incur indebtedness or to make distributions under certain circumstances and require us to maintain financial ratios and a minimum net worth.  At December 31, 2015, we believe we were in compliance with all of our respective covenants under our public debt indenture and related supplements, our revolving credit facility and our term loan agreements.

Senior Unsecured Notes:

On May 1, 2015, we redeemed at par $138.8 million of our 5.75% senior unsecured notes due 2015 and recognized a loss on early extinguishment of debt of $0.1 million from the write-off of an unamortized discount and unamortized deferred financing fees.

On November 17, 2014, we redeemed at par $125.0 million of our 7.50% unsecured senior notes due 2019 and recognized a loss on early extinguishment of debt of $1.8 million from the write-off of an unamortized discount and deferred financing fees.

On September 15, 2014, we redeemed at par $33.4 million of our 6.40% unsecured senior notes due 2015.

In March 2013, we purchased a total of $670.3 million of the outstanding principal amount of senior notes for $726.2 million, excluding transaction costs, pursuant to a tender offer. In connection with the purchase of these senior notes, we recognized a combined loss on early extinguishment of debt totaling $60.0 million, which includes the write-off of unamortized discounts and deferred financing fees and expenses.

Mortgage Notes Payable:

At December 31, 2015, five of our properties (8 buildings) with an aggregate net book value of $287.5 million had secured mortgage notes totaling $249.7 million (including net premiums and discounts) maturing from 2017 through 2026.

On December 1, 2015, we repaid at par $116.0 million of 5.24% mortgage debt at 111 Monument Circle and recognized a gain on early extinguishment of debt of $0.6 million for the year ended December 31, 2015 from the write-off of an unamortized premium, net of the write-off of unamortized deferred financing fees.

In accordance with the agreement to sell Illinois Center, we were required to deliver the property unencumbered. On August 3, 2015, prior to the sale, we defeased the outstanding $141.4 million balance of the mortgage loan secured by 111 East Wacker Drive, one of the buildings included in Illinois Center. The defeasance costs and write off of the unamortized deferred financing costs, net of the write off of the unamortized premium, resulted in a net loss on early extinguishment of debt of $3.9 million for the year ended December 31, 2015.

In accordance with the agreement to sell 2501 20th Place South, we were required to deliver the property unencumbered. On June 5, 2015, we prepaid $10.0 million of 7.36% mortgage debt at 2501 20th Place South and recognized a loss on early extinguishment of debt totaling $0.6 million for the year ended December 31, 2015, which consisted of a prepayment premium and the write off of unamortized deferred financing fees, net of the write off of an unamortized premium.

In accordance with the agreement to sell 1320 Main Street, we were required to deliver the property unencumbered. On June 3, 2015, prior to the sale, we defeased the $38.7 million outstanding balance of the mortgage loan secured by 1320 Main Street. The defeasance costs and write off of the unamortized deferred financing costs, net of the write off of the unamortized premium, resulted in a net loss on early extinguishment of debt of $6.2 million for the year ended December 31, 2015.

During the quarter ended June 30, 2014, we made the decision to cease making loan servicing payments on 225 Water Street in Jacksonville, Florida.  The first payment we determined not to make for this property was due on June 11, 2014.  The property was secured by a non-recourse mortgage loan. On October 10, 2014, we were notified by the lender that our decision to cease making loan servicing payments created an event of default effective July 11, 2014, and the lender exercised its option to accelerate the maturity of the unpaid balance of the loan. Beginning July 11, 2014, we accrued interest on this loan at 10.03%, to include the 4.0% of default interest. The lender filed a suit of foreclosure for this property and we cooperated with the lender to allow for a consensual foreclosure process.  On May 22, 2015, title to 225 Water Street was transferred to the lender pursuant to the consensual foreclosure in full satisfaction of the mortgage debt, with a principal balance of $40.1 million. The transaction resulted in a gain on early extinguishment of debt of $17.3 million for the excess of the debt principal balance over the net book value of the property for the year ended December 31, 2015.

On October 31, 2014, we repaid at par the $7.8 million mortgage loan encumbering 6200 Glenn Carlson Drive.

On August 1, 2014, we prepaid at par the $265.0 million of 5.68% mortgage debt at 600 West Chicago Avenue and recognized a net gain on early extinguishment of debt of $6.7 million from the write-off of an unamortized premium, net of the write-off of unamortized deferred financing fees.

On June 27, 2014, we repaid $11.2 million of 6.14% mortgage debt and $8.5 million of 5.78% mortgage debt in connection with the sale of the related properties and recognized a loss on early extinguishment of debt of $3.3 million, included in loss on early extinguishment of debt from discontinued operations, from prepayment penalties and the write-off of unamortized discounts and deferred financing fees.

On March 11, 2014, we prepaid at par the $12.0 million of 4.95% mortgage debt at 3920 Arkwright Road.

Required Principal Payments:

The required principal payments due during the next five years and thereafter under all of our outstanding debt at December 31, 2015 are as follows (in thousands):

2016	$	142,450
2017	294,865
2018	253,847
2019	164,613
2020	451,674
Thereafter	404,217
	$	1,711,666

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Shareholders' Equity

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders’ Equity

Common Share Issuances:

During the year ended December 31, 2015, we issued 144 common shares to holders of 301 of our series D cumulative convertible preferred shares (series D preferred shares) who elected to convert their series D preferred shares into our common shares.

During the year ended December 31, 2014, we issued 10,412,499 common shares to holders of 10,264,503 of our series D preferred shares who converted their series D preferred shares into our common shares.

During the year ended December 31, 2014, we issued 90,135 common shares to RMR pursuant to the amended and restated business management agreement. See Note 19 for further information regarding this agreement.

See Note 14 for information regarding equity issuances related to share-based compensation.

Common Share Repurchases:

On August 24, 2015, our Board of Trustees approved a common share repurchase plan, which authorizes the repurchase of up to $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. On September 14, 2015, our Board of Trustees authorized the repurchase of up to an additional $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. During the year ended December 31, 2015, we purchased and retired 3,410,300 of our common shares at a weighted average price of $25.76 per share.

Common Share Distributions:

In January 2014, we declared a distribution of $0.25 per common share, or $29.6 million, which we paid on February 21, 2014 to shareholders of record on January 13, 2014. Our revolving credit facility agreement and term loan agreement contain a number of financial and other covenants, including a covenant which restricts our ability to make distributions under certain circumstances. See Note 9 for additional information regarding our revolving credit facility agreement and term loan agreement.

The following characterizes distributions paid per common share for the years ended December 31, 2015, 2014, and 2013:

	Year Ended December 31,
	2015		2014		2013
Ordinary income	—	%	—	%	—	%
Return of capital	—	%	—	%	100.00	%
Capital gain	—	%	100.00	%	—	%
Unrecaptured Section 1250 gain	—	%	—	%	—	%
	—	%	100.00	%	100.00	%

Series D Preferred Shares:

Each of our 4,915,196 series D cumulative convertible preferred shares accrue dividends of $1.625, or 6.50% per annum of the liquidation amount, payable in equal quarterly payments. Our series D preferred shares are convertible, at the holder's option, into our common shares at an initial conversion rate of 0.480775 common shares per series D preferred share, which is equivalent to an initial conversion price of $52.00 per common share, or 2,363,103 additional common shares at December 31, 2015. On or after November 20, 2011, if our common shares trade at or above the then applicable conversion price, we may, at our option, convert some or all of the series D preferred shares into common shares at the then applicable conversion rate. If a fundamental change occurs, which generally will be deemed to occur upon a change in control of us or a termination of trading of our common shares (or other equity securities into which our series D preferred shares are then convertible), holders of our series D preferred shares will have a special right to convert their series D preferred shares into a number of our common shares per $25.00 liquidation preference, plus accrued and unpaid distributions, divided by 98% of the average closing market price of our common shares for a specified period before such event is effective, unless we exercise our right to repurchase these series D preferred shares for cash, at a purchase price equal to 100% of their liquidation preference, plus accrued and unpaid distributions. The issuance of a large number of common shares as a result of the exercise of this conversion right after a fundamental change may have a dilutive effect on income from continuing operations attributable to Equity Commonwealth common shareholders per share for future periods.

The removal of our former Trustees on March 25, 2014, triggered a Fundamental Change Conversion Right of the series D preferred shares, as defined in our Articles Supplementary dated October 10, 2006, setting forth the terms of the series D preferred shares.  Pursuant to such right, the holders of series D preferred shares had the option to elect to convert all or any portion of their series D preferred shares at any time from April 9, 2014 until the close of business on May 14, 2014 into a number of common shares per $25.00 liquidation preference of the series D preferred shares equal to the sum of such $25.00 liquidation preference plus accrued and unpaid dividends to, but not including, May 14, 2014, divided by 98% of the average of the closing sale prices of the common shares for the five consecutive trading days ending on May 9, 2014, or the Fundamental Change Conversion Rate.  Holders of 10,263,003 series D preferred shares elected to exercise their Fundamental Change Conversion Right and converted their series D preferred shares into 10,411,779 of our common shares.  As a result of this transaction, we recognized a non-cash preferred distribution of $16.2 million, for the excess of the market value of the common shares issued above the carrying value of the series D preferred shares redeemed. As of December 31, 2015, we had 4,915,196 outstanding series D preferred shares that were convertible into 2,363,103 of our common shares.

Series E Preferred Shares:

Each of our 11,000,000 series E preferred shares has a liquidation preference of $25.00 and requires dividends of $1.8125, or 7.25% per annum of the liquidation amount, payable in equal quarterly payments. The series E preferred shares are redeemable at our option for $25.00 each plus accrued and unpaid distributions at any time on or after May 15, 2016 or if a change of control occurs which results in our common shares (or the common securities of an acquiring or surviving entity) not being listed or quoted on the NYSE or certain other exchanges or quotation systems. Also, upon the occurrence of such a change of control, holders of series E preferred shares that we do not elect to redeem may at their option convert those series E preferred shares into our common shares (or certain alternative consideration) at a conversion rate generally based on their $25.00 liquidation preference per share, plus accrued and unpaid distributions, and the market price of our common shares at the time of conversion, subject to a cap.

Preferred Share Distributions:

In 2015, our Board of Trustees declared distributions on our series D preferred shares and series E cumulative redeemable preferred shares to date as follows:

Declaration Date	Record Date	Payment Date	Series D Dividend Per Share		Series E Dividend Per Share
January 16, 2015	February 2, 2015	February 17, 2015	$	0.40625	$	0.453125
April 8, 2015	May 1, 2015	May 15, 2015	$	0.40625	$	0.453125
July 9, 2015	July 31, 2015	August 17, 2015	$	0.40625	$	0.453125
October 9, 2015	November 2, 2015	November 16, 2015	$	0.40625	$	0.453125

Under our governing documents and Maryland law, distributions to our shareholders are to be authorized and declared by our Board of Trustees.  Additionally, the removal of our former Trustees, which occurred on March 25, 2014, constituted an event of default under our term loan and revolving credit facility agreements, under which we generally are prevented from making any distributions or paying any dividends during the pendency of an event of default.  As a result of the foregoing, we were unable to declare and pay dividends between March 25, 2014, and June 6, 2014, the date on which we obtained waivers of the aforementioned events of default from our lenders. 

Alternative Minimum Tax:

Alternative minimum tax adjustments are to be apportioned between a REIT and its shareholders under Internal Revenue Code Section 59(d). Although regulations have not yet been issued under that provision, based on regulations issued pursuant to a similar provision of prior law and the legislative history of the current provision, it appears that such alternative minimum tax adjustments are to be apportioned to a REIT’s shareholders to the extent that the REIT distributes its regular taxable income. It is our policy to distribute all of our regular taxable income and accordingly, all of our alternative minimum tax adjustments are being apportioned to our shareholders.

We have determined that 0%, 15.41% and 0% of each distribution to our shareholders for the tax years ended December 31, 2015, 2014, and 2013, respectively, consists of an alternative minimum tax adjustment.

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Cumulative Other Comprehensive Loss

12 Months Ended

Dec. 31, 2015

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Cumulative Other Comprehensive Loss

Cumulative Other Comprehensive Loss

The following tables present the amounts recognized in cumulative other comprehensive loss by component for the year ended December 31, 2015 (in thousands):

	Year Ended December 31, 2015
	Unrealized Loss on Derivative Instruments and Other Assets			Foreign Currency Translation Adjustments			Total
Balances as of January 1, 2015	$	(4,299	)	$	(48,917	)	$	(53,216	)
Other comprehensive loss before reclassifications	(1,232		)	(14,290		)	(15,522		)
Amounts reclassified from cumulative other comprehensive loss to net income	1,844			63,207			65,051
Net current period other comprehensive income	612			48,917			49,529
Balances as of December 31, 2015	$	(3,687	)	$	—		$	(3,687	)

The following tables present reclassifications out of cumulative other comprehensive loss for the year ended December 31, 2015 (in thousands):

	Year Ended December 31, 2015
Details about Cumulative Other Comprehensive Loss Components	Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income			Affected Line Items in the Statement of Operations
Interest rate swap contracts	$	4,924		Interest expense
Foreign currency translation adjustment activity	63,207			Gain on sale of properties
Realized gain on available for sale securities	(3,080		)	Interest and other income
	$	65,051

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Income Taxes

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Our provision for income taxes consists of the following (in thousands):

	Year Ended December 31,
	2015			2014		2013
Current:
State	$	270		$	350	$	519
Federal	513			—		—
Foreign	2,336			2,772		2,572
	3,119			3,122		3,091
Deferred:
Foreign	(755		)	69		(457		)
	(755		)	69		(457		)
Income tax expense	$	2,364		$	3,191	$	2,634

Federal income tax expense for the year ended December 31, 2015 relates to taxes incurred as a result of a taxable built-in gain triggered by the sale of a property that was previously owned by a C corporation. As a result of the disposition of the Australian properties, we incurred net income tax expense of $1.6 million for the year ended December 31, 2015.

A reconciliation of our effective tax rate and the U.S. Federal statutory income tax rate is as follows:

	Year Ended December 31,
	2015		2014		2013
Taxes at statutory U.S. federal income tax rate	35.00	%	35.00	%	35.00	%
Dividends paid deduction and net operating loss utilization	(35.00	)%	(35.00	)%	(35.00	)%
Federal taxes on built-in gain	0.50	%	—	%	—	%
State, local, and foreign income taxes	1.81	%	11.73	%	(1.71	)%
Effective tax rate	2.31	%	11.73	%	(1.71	)%

Deferred income tax assets and liabilities, net of a valuation allowance, represent the tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes, and are determined using tax rates expected to be in effect when the deferred income tax assets and liabilities are anticipated to be paid or recovered. At December 31, 2014, we had deferred tax assets of $2.4 million, net of a valuation allowance of $0.6 million, and deferred tax liabilities of $3.1 million, which primarily relate to different carrying amounts for financial reporting and for Australian income tax purposes related to our properties and operations in Australia. The deferred tax assets primarily relate to depreciation differences and the deferred tax liabilities primarily relate to straight line rent adjustments. During the year ended December 31, 2015, we sold our Australian properties (Note 4) and as of December 31, 2015, we do not have any deferred tax assets or liabilities related to our Australian properties. We generated significant net operating losses through the 2015 property sales and we have fully reserved the associated deferred tax assets due to the uncertainty of our ability to utilize the net operating losses in the future.

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Derivative Instruments

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

Risk Management Objective of Using Derivatives

We are exposed to certain risks relating to our ongoing business operations, including the effect of changes in interest rates.  The only risk we currently manage by using derivative instruments is a part of our interest rate risk. 

We may use derivative financial instruments, including interest rate swaps, caps, options, floors and other interest rate derivative contracts, to hedge all or a portion of the interest rate risk associated with our borrowings. The principal objective of such arrangements is to minimize the risks and/or costs associated with our operating and financial structure as well as to hedge specific anticipated transactions. We do not intend to utilize derivatives for speculative or other purposes other than interest rate risk management. The use of derivative financial instruments carries certain risks, including the risk that the counterparties to these contractual arrangements are not able to perform under the agreements. To mitigate this risk, we only enter into derivative financial instruments with counterparties with high credit ratings and with major financial institutions with which we and our affiliates may also have other financial relationships. We do not anticipate that any of the counterparties will fail to meet their obligations.

Cash Flow Hedges of Interest Rate Risk

Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we periodically use interest rate swaps, caps, or other similar instruments as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for us making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in cumulative other comprehensive income (loss) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During 2015, such derivatives were used to hedge the variable cash flows associated with variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings.

Amounts reported in cumulative other comprehensive loss related to derivatives will be reclassified to interest expense as interest payments are made on our variable-rate debt. During the next twelve months, we estimate that an additional $3.7 million will be reclassified from cumulative other comprehensive loss as an increase to interest expense.

We have interest rate swap agreements to manage our interest rate risk exposure on $169.6 million of mortgage debt due 2019, which require interest at a spread over LIBOR.  The interest rate swap agreements utilized by us qualify as cash flow hedges and effectively modify our exposure to interest rate risk by converting our floating interest rate debt to a fixed interest rate basis for this loan through December 1, 2016, thus reducing the impact of interest rate changes on future interest expense.  As of December 31, 2015, we had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk:

Interest Rate Derivative	Number of Instruments	Notional Amount (in thousands)
Interest rate swap	2	$169,612

The table below presents the fair value of our derivative financial instruments as well as their classification on the consolidated balance sheets as of December 31, 2015, and 2014 (amounts in thousands):

		Fair Value as of December 31,
Interest Rate Derivative Designated as Hedging Instrument	Balance Sheet Location	2015		2014
Pay-fixed swaps	Accounts payable and accrued expenses	$	3,687	$	7,462

The table below details the location in the financial statements of the gain or loss recognized on interest rate derivatives designated as cash flow hedges for the years ended December 31, 2015, 2014, and 2013 (amounts in thousands):

	Year Ended December 31,
	2015			2014			2013
Balance at beginning of period	$	(7,462	)	$	(11,706	)	$	(16,624	)
Amount of loss recognized in cumulative other comprehensive loss	(1,149		)	(776		)	(103		)
Amount of loss reclassified from cumulative other comprehensive loss into interest expense	4,924			5,020			5,021
Unrealized gain on derivative instruments	3,775			4,244			4,918
Balance at end of period	$	(3,687	)	$	(7,462	)	$	(11,706	)

Credit-risk-related Contingent Features

We have agreements with each of our derivative counterparties that contain a provision where if we either default or are capable of being declared in default on any of our indebtedness, then we could also be declared in default on our derivative obligations.

As of December 31, 2015, the fair value of derivatives in a net liability position including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $4.1 million. As of December 31, 2015, we have not posted any collateral related to these agreements and were not in breach of any agreement provisions. If we had breached any of these provisions, we could have been required to settle our obligations under the agreements at their aggregate termination value of $4.1 million at December 31, 2015.

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Share-Based Compensation

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

Share-Based Compensation

Equity Commonwealth 2015 Omnibus Incentive Plan

On June 16, 2015, at our 2015 annual meeting of shareholders, our shareholders approved the Equity Commonwealth 2015 Omnibus Incentive Plan (the 2015 Incentive Plan). The 2015 Incentive Plan replaced the Equity Commonwealth 2012 Equity Compensation Plan (as amended, the 2012 Plan). The Board of Trustees approved the 2015 Incentive Plan, subject to shareholder approval, on March 18, 2015 (the Effective Date). On January 26, 2016, the Board of Trustees approved an amendment to the 2015 Incentive Plan to allow the Compensation Committee (Committee) to authorize in an award agreement a transfer of all or a part of certain equity awards not for value to a “family member” (as defined in the 2015 Incentive Plan). The following description of certain terms of the 2015 Incentive Plan is qualified in all respects by the terms of the 2015 Incentive Plan.

Eligibility. Awards may be granted under the 2015 Incentive Plan to employees, officers and non-employee directors of the Company, its subsidiaries or its affiliates, or consultants and advisors (who are natural persons) providing services to the Company, its subsidiaries or its affiliates, or any other person whose participation in the 2015 Incentive Plan is determined by the Committee to be in the best interests of the Company.

Term. The 2015 Incentive Plan terminates automatically ten years after the Effective Date, unless it is terminated earlier by the Board of Trustees.

Shares Available for Issuance. Subject to adjustment as provided in the 2015 Incentive Plan, the maximum number of common shares of the Company that are available for issuance under the 2015 Incentive Plan is 3,250,000 shares.

Awards. The following types of awards may be made under the 2015 Incentive Plan, subject to limitations set forth in the 2015 Incentive Plan:

· Stock options;

· Stock appreciation rights;

· Restricted stock;

· Restricted stock units;

· Unrestricted stock;

· Dividend equivalent rights;

· Performance shares and other performance-based awards;

· Limited partnership interests in any partnership entity through which the Company may conduct its business in the future;

· Other equity-based awards; and

· Cash bonus awards.

Recipients of the Company’s restricted shares have the same voting rights as any other common shareholder. During the period of restriction, the Company’s unvested restricted shareholders are eligible to receive dividend payments on their shares at the same rate and on the same date as any other common shareholder. Recipients of the Company’s restricted stock units (RSUs) are entitled to receive dividends with respect to the common shares underlying the RSUs if and when the RSUs are earned, at which time the recipient will be entitled to receive an amount in cash equal to the aggregate amount of ordinary cash dividends that would have been paid in respect of the common shares underlying the recipient’s earned RSUs had such common shares been issued to the recipient on the first day of the performance period.

Administration. The 2015 Incentive Plan will be administered by the Committee, which will determine all terms and recipients of awards under the 2015 Incentive Plan.

2015 Equity Award Activity

On June 16, 2015, in accordance with the Company’s compensation plan for independent Trustees, the Committee awarded each of the nine independent Trustees $0.1 million in restricted shares as part of their compensation for the 2015-2016 year of service on the Board of Trustees. These awards equated to 3,843 shares per Trustee, for a total of 34,587 shares, valued at $26.02 per share, the closing price of our common shares on the NYSE on that day. These shares vest one year after the date of the award.

On January 28, 2015, the Committee approved a grant of 126,319 restricted common shares and 639,250 RSUs at target to the Company’s officers, certain employees and to Mr. Zell, the Chairman of our Board of Trustees, as part of their compensation for fiscal year 2014.  

The restricted shares are service based awards and vest over a four-year period. The restricted shares were granted on January 28, 2015 and were valued at $26.58 per share, the closing price of our common shares on the NYSE on that day.

The 776,456 unvested restricted shares as of December 31, 2015 are scheduled to vest as follows: 188,879 shares in 2016, 185,467 shares in 2017, 339,759 shares in 2018 and 62,351 shares in 2019. As of December 31, 2015, the estimated future compensation expense for all unvested restricted share grants was $14.6 million. Compensation expense for the restricted share awards is being recognized on a straight-line basis over the requisite service period for each separately vesting portion of the award. The weighted average period over which the future compensation expense will be recorded for the restricted shares is approximately 2.8 years.

The RSUs are market based awards with a service condition and grant recipients may earn the RSU grants based on the Company’s total shareholder return (TSR) relative to the TSR's for the constituent REITs that comprise the NAREIT Office Index for the performance period of January 28, 2015 - January 28, 2018. Following the end of the performance period on January 28, 2018, the number of earned awards will be determined. The earned awards vest in two tranches with 50% of the earned award vesting on January 28, 2018 and the remaining 50% of the earned award vesting on January 28, 2019, subject to the grant recipient’s continued employment. Recipients of the Company’s RSUs are entitled to receive dividends with respect to the common shares underlying the RSUs if and when the RSUs are earned. To the extent that an award does not vest, the dividends will be forfeited. Compensation expense for the RSU awards was determined using a Monte Carlo simulation model and is being recognized ratably from the grant date to the vesting date of each tranche.

2014 Equity Award Activity

On October 28, 2014, the Committee approved the one-time grant of restricted common shares and restricted share units under the 2012 Plan to certain of the Company’s officers and employees and to Mr. Zell, the Chairman of our Board of Trustees.  The Committee also approved the one-time grant of restricted common shares under the 2012 Plan to our independent Trustees, a grant of restricted common shares to each independent Trustee as annual compensation for his or her service as a Trustee, and a pro-rata grant of fully vested common shares for five of our independent Trustees for their service from May 23, 2014 through July 31, 2014. 

Outstanding Equity Awards

The table below presents a summary of restricted share and RSU activity under the 2015 Incentive Plan and the 2012 Plan for the years ended December 31, 2015, and 2014, excluding restricted shares granted to our former Trustees, former officers and certain employees of RMR under the terms of our 2012 Plan (which grants are further described below):

	Number of Restricted Shares		Weighted Average Grant Date Fair Value		Number of RSUs		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013	—		$	—	—		$	—
Granted	713,727		26.66		1,266,237		15.99
Vested	(3,545	)	26.66		—		—
Outstanding at December 31, 2014	710,182				1,266,237
Granted	160,906		26.46		639,250		15.47
Vested	(86,517	)	26.02		—		—
Forfeited	(8,115	)	26.64		(21,377	)	15.80
Outstanding at December 31, 2015	776,456				1,884,110

The RSUs are market based awards with a service condition and grant recipients may earn between 0% - 100% of the RSU grant based on the Company’s TSR relative to the TSR for the NAREIT Office Index for the period from October 28, 2014 - October 28, 2017. Following the end of the performance period on October 28, 2017, the number of earned awards will be determined. The earned awards vest in two tranches with 50% of the earned award vesting on October 28, 2017 and the remaining 50% of the earned award vesting on October 28, 2018 subject to the grant recipient’s continued employment.

As of December 31, 2015, the estimated future compensation expense for all unvested RSUs was $20.3 million. The weighted average period over which the future compensation expense will be recorded for the RSUs is approximately 2.4 years.

The assumptions and fair values for the RSUs granted for the years ended December 31, 2015, and 2014 are included in the following table on a per share basis.

	2015			2014
Fair value of RSUs granted	$	15.47		$	15.99
Expected term (years)	4			4
Expected volatility	—			—
Expected dividend yield	1.88		%	1.88		%
Risk-free rate	0.81		%	0.84		%

During the years ended December 31, 2015 and 2014, we recorded $15.4 million and $2.6 million, respectively, of compensation expense, net of forfeitures, in general and administrative expense for grants to our Board of Trustees and the Company's employees related to our Plan. At December 31, 2015, 3,215,413 common shares remain available for issuance under the Plan.

2012 Equity Compensation Plan

Prior to the adoption of the 2015 Incentive Plan, we had common shares available for issuance under the 2012 Plan. The 2012 Plan was adopted in May 2012 and replaced our 2003 Incentive Share Award Plan, or the 2003 Plan. We awarded common shares to our former officers and certain employees of RMR pursuant to both of these plans. On January 28, 2014, we granted 2,000 common shares of beneficial interest, par value $0.01 per share, valued at $23.46 per share, the closing price of our common shares on the New York Stock Exchange, or NYSE, on that day, to two of our former Trustees as part of their then annual compensation. We also awarded each of our former Trustees 2,000 common shares in 2013 with an aggregate market value of $0.2 million on the date of grant, as part of their annual compensation. The common shares awarded to our former Trustees vested immediately. We include the value of awarded shares in general and administrative expenses at the time the awards vest. See Note 19 for further information regarding grants of restricted shares we made to our former officers and certain employees of RMR. 

On October 28, 2014, the Board of Trustees approved an amendment to the 2012 Plan to permit the Company to issue RSUs.  Additionally, on October 28, 2014, the Committee approved new forms of Restricted Share and Restricted Share Unit Agreements to be used for grants of restricted common shares to members of the Board of Trustees, as well as grants of restricted common shares and restricted share units to officers and employees of the Company. 

The 2015 Incentive Plan replaced the 2012 Plan. No future grants will be made under the 2012 Plan, although the terms and conditions of the 2012 Plan will continue to govern any outstanding awards granted under the 2012 Plan. A summary of shares granted and vested to our former Trustees, former officers and certain employees of RMR under the terms of our 2012 Plan and our 2003 Plan for the years ended December 31, 2014, and 2013, is as follows:

	Number of Shares		Weighted Average Grant Date Fair Value
Unvested shares at December 31, 2012	114,703		19.39
Granted	83,450		23.29
Vested	(66,639	)	23.06
Forfeited	(600	)	22.49
Unvested shares at December 31, 2013	130,914		20.70
Granted	4,000		23.46
Vested	(134,914	)	25.79
Unvested shares at December 31, 2014	—		—

As a result of the removal of our former Trustees on March 25, 2014, the vesting of 130,914 common shares previously issued to our former officers and certain employees of RMR pursuant to our equity compensation plans accelerated in accordance with the terms of their governing share grants.  During the year ended December 31, 2014, we recorded $3.4 million of general and administrative expense related to the vesting of these shares.

During the years ended December 31, 2014, and 2013, we recorded $3.4 million and $1.8 million, respectively, of compensation expense for former Trustees, former officers and certain employees of RMR under the terms of our 2012 Plan and our 2003 Plan. In addition, during the period that SIR was our consolidated subsidiary, we recorded compensation expense related to SIR's equity compensation plan of $0.4 million for the year ended December 31, 2013.

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Defined Contribution Plan (Notes)

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Defined Contribution Plan

Defined Contribution Plan

We have a defined contribution plan that covers employees meeting eligibility requirements. We match 100% of the first 3% of compensation that an employee elects to defer plus 50% of compensation that an employee elects to defer exceeding 3% but not exceeding 5%, subject to a maximum of $8,000. The Company’s matching contribution vests immediately. The Company's contributions were $0.3 million for the year ended December 31, 2015.

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Fair Value of Assets and Liabilities

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value of Assets and Liabilities

Fair Value of Assets and Liabilities

The table below presents certain of our assets and liabilities measured at fair value during 2015 and 2014, categorized by the level of inputs used in the valuation of each asset and liability (dollars in thousands):

				Fair Value at December 31, 2015 Using
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
Description	Total			(Level 1)		(Level 2)			(Level 3)
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$	(3,687	)	$	—	$	(3,687	)	$	—
Derivative liability	(7,219		)	—		—			(7,219		)

				Fair Value at December 31, 2014 Using
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
Description	Total			(Level 1)		(Level 2)			(Level 3)
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$	(7,462	)	$	—	$	(7,462	)	$	—
Derivative liability	(6,658		)	—		—			(6,658		)

Effective Portion of Interest Rate Swap Contracts

The fair value of our interest rate swap contracts is determined using the net discounted cash flows of each derivative based on the market based interest rate curve (level 2 inputs) and adjusted for our credit spread and the actual and estimated credit spreads of the counterparties (level 3 inputs).  Although we have determined that the majority of the inputs used to value our derivatives fall within level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default by us and the counterparties.  As of December 31, 2015, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivatives.  As a result, we have determined that our derivative valuations in their entirety are classified as level 2 inputs in the fair value hierarchy.

Derivative Liability

On July 31, 2014, our shareholders voted to approve the reimbursement of expenses incurred by Related/Corvex (Note 17). Approximately $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period after the date on which the reimbursement was approved by shareholders, and the remaining approximately $8.4 million will be reimbursed only if the average closing price of our common shares is at least $26.00 (as adjusted for any share splits or share dividends) during the one year period between the first and second anniversaries of the date on which the reimbursement was approved by shareholders. The average closing price of our common shares was at least $26.00 during the first one year period after the date on which the reimbursement was approved by shareholders, and in August 2015, we paid $8.4 million to Related/Corvex. The potential future reimbursement represents a derivative instrument as codified in ASC 815 Derivatives and Hedging which requires the potential future reimbursement to be recorded at fair value at each reporting date.

We recognized expense of $9.0 million for the year ended December 31, 2015, which was recorded in general and administrative expenses in our consolidated statement of operations for the year ended December 31, 2015. The valuation techniques and significant unobservable inputs used for our level 3 fair value measurement at December 31, 2015, and 2014 were as follows:

Description	Fair Value at December 31, 2015		Primary Valuation  Technique	Unobservable Inputs	Rate
Derivative liability	$	7,219	Monte Carlo simulation	Risk-free rate	0.52%
				Volatility	20.0%

Description	Fair Value at December 31, 2014		Primary Valuation  Technique	Unobservable Inputs	Rate
Derivative liability	$	6,658	Monte Carlo simulation	Risk-free rate	0.50%
				Volatility	20.0%

Properties Held and Used

As part of our disposition plan, and pursuant to our accounting policy, in 2015, we evaluated the recoverability of the carrying values of each of the real estate assets that comprised our portfolio and determined that due to the shortening of the expected periods of ownership as a result of the disposition plan, it was necessary to reduce the net book value of a portion of the real estate assets in our portfolio to reduce the assets to their estimated fair values.  During the year ended December 31, 2015, we recorded an impairment charge of $17.2 million in accordance with our impairment analysis procedures.

In 2014, we ceased to actively market 31 properties with a combined 5.6 million square feet which we had previously classified as held for sale as of December 31, 2013, which were not under agreement for sale when our former Trustees were removed. These properties were reclassified to properties held and used in operations because they no longer meet the requirements for classification as held for sale. Operating results for these properties were reclassified from discontinued operations to continuing operations for all periods presented herein. In connection with this reclassification, we reversed previously recorded impairment losses totaling $4.8 million in 2014, which includes the elimination of estimated costs to sell.

In connection with the internalization of management, we developed a disposition plan in the fourth quarter of 2014. Through this plan, we expect to dispose of many of our assets in the coming years. Pursuant to our accounting policy, we evaluated the recoverability of the carrying values of each of the real estate assets that comprised our portfolio and determined that due to the shortening of the expected periods of ownership, as a result of the disposition plan, that it was necessary to reduce the net book value of a portion of the real estate assets in our portfolio.  As a result, we recorded a loss on asset impairment for 34 properties of $167.1 million in 2014, to reflect the estimated fair values of those real estate assets in our portfolio that failed the recoverability test because the net book values exceeded their fair values.  We reduced the aggregate carrying value of these properties from $581.7 million to their estimated fair value of $414.6 million, reflected in the table below.

The fair value measurements used in the evaluation of our real estate assets are considered to be Level 3 valuations within the fair value hierarchy outlined above, as there are significant unobservable inputs. Examples of inputs that were utilized in the fair value calculations include estimated holding periods, discount rates, market capitalization rates, expected lease rental rates, and third party broker information. The valuation techniques and significant unobservable inputs used for our level 3 fair value measurements at December 31, 2014 were as follows:

Description	Fair Value at December 31, 2014		Primary Valuation Techniques	Unobservable Inputs	Weighted Average(1)
Properties held and used on which we recognized impairment losses	$	414,625	Discounted cash flows	Discount rate	10.2%
				Exit capitalization rate	9.1%

(1) Calculated as a weighted average based on the fair value at December 31, 2014.

In 2014, we made the decision to cease making loan servicing payments on 225 Water Steet in Jacksonville, Florida (Note 9).  As a result of the decision to discontinue making loan servicing payments on this property, we recorded a loss on asset impairment totaling $22.7 million to reduce the aggregate carrying value of this property from $42.3 million to its estimated fair value of $19.6 million.  We used discounted cash flow analysis and third party broker information (level 3 inputs) in determining the fair value of this property.  The valuation techniques and significant unobservable inputs used for our level 3 fair value measurements at June 30, 2014 were as follows:

Description	Fair Value at June 30, 2014		Primary Valuation Techniques	Unobservable Inputs	Rate
225 Water Street	$	19,589	Discounted cash flows	Discount rate	8%
				Exit capitalization rate	8%

Financial Instruments

In addition to the assets and liabilities described in the above table, our financial instruments include our cash and cash equivalents, real estate mortgages receivable, restricted cash, senior unsecured debt and mortgage notes payable.  At December 31, 2015 and 2014, the fair value of these additional financial instruments were not materially different from their carrying values, except as follows (in thousands):

	December 31, 2015				December 31, 2014
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Senior unsecured debt and mortgage notes payable, net	$	1,710,324	$	1,749,211	$	2,207,665	$	2,263,535

The fair values of our senior notes and mortgage notes payable are based on estimates using discounted cash flow analyses and currently prevailing interest rates adjusted by credit risk spreads (level 3 inputs).

Other financial instruments that potentially subject us to concentrations of credit risk consist principally of rents receivable; however, as of December 31, 2015, no single tenant of ours is responsible for more than 4% of our total annualized rents.

Our derivative financial instruments, including interest rate swaps, are entered with major financial institutions and we monitor the amount of credit exposure to any one counterparty.

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Earnings Per Common Share

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Common Share

Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per share (amounts in thousands except per share amounts):

	Year Ended December 31,
	2015			2014			2013
Numerator for earnings per common share - basic and diluted:
Income (loss) from continuing operations	$	99,857		$	21,206		$	(37,318	)
Net income attributable to noncontrolling interest in consolidated subsidiary	—			—			(20,093		)
Preferred distributions	(27,924		)	(32,095		)	(44,604		)
Excess fair value of consideration over carrying vale of preferred shares	—			(16,205		)	—
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders	71,933			(27,094		)	(102,015		)
Discontinued operations	—			2,806			(119,649		)
Numerator for net income (loss) per share - basic and diluted	$	71,933		$	(24,288	)	$	(221,664	)
Denominator for earnings per common share - basic and diluted:
Weighted average number of common shares outstanding - basic	128,621			125,163			112,378
Weighted average number of common shares outstanding - diluted(1)	129,437			125,163			112,378
Earnings per share - basic:
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders	$	0.56		$	(0.21	)	$	(0.91	)
Discontinued operations	—			0.02			(1.06		)
Net income (loss) per share - basic	$	0.56		$	(0.19	)	$	(1.97	)
Earnings per share - diluted:
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders	$	0.56		$	(0.21	)	$	(0.91	)
Discontinued operations	—			0.02			(1.06		)
Net income (loss) per share - diluted	$	0.56		$	(0.19	)	$	(1.97	)
Anti-dilutive securities:
Effect of Series D preferred shares; 6 1/2% cumulative convertible(2)	2,363			4,175			7,298

(1) As of December 31, 2015, we had granted RSUs to certain employees, officers, and the chairman of the Board of Trustees.  The RSUs contain both service and market-based vesting components.  None of the RSUs have vested.  If the market-based vesting component was measured as of December 31, 2015, 1,143 common shares would be issued to the RSU holders, and no shares would have been issued for the other periods presented.  Using a weighted average basis, 816 common shares are reflected in diluted earnings per share for the year ended ended December 31, 2015.

(2) The Series D preferred shares are excluded from the diluted earnings per share calculation because including the Series D preferred shares would also require that the preferred distributions be added back to net income, resulting in anti-dilution during the periods presented.

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Segment Information

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Segment Information

Segment Information

Our primary business is the ownership and operation of office properties.  Due to significant dispositions during 2015, during the fourth quarter of 2015 we changed the composition of our operating segments from two reportable segments (central business district properties and suburban properties) to one reportable segment. This change was made based on the financial information reviewed and used by the chief operating decision maker to make operating decisions, assess performance, develop strategy and allocate capital resources. More than 90% of our revenues are from office properties.

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Related Person Transactions

12 Months Ended

Dec. 31, 2015

Related Party Transactions [Abstract]

Related Person Transactions

Related Person Transactions

The following discussion includes a description of our related person transactions for the years ended December 31, 2015, 2014 and 2013. Certain of these related person transactions, and their approvals, occurred prior to the election of our new Board of Trustees at the Special Meeting and the appointment of our current executive officers following the Special Meeting. The disclosure below under “—Transactions with Prior Related Persons” describes our transactions and approvals with our prior related persons.

Related Person Transactions Following the Special Meeting:

Equity Group Investments and associated entities: Effective February 1, 2016, we entered into a lease with Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman, for storage space in the basement of the building. The lease expires December 31, 2020, provided each party has the right to terminate on 30 days' prior written notice, and the payment is nominal. This lease was approved by the Audit Committee of the Board of Trustees.

Effective July 20, 2015, we entered into a lease with Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman, to occupy office space on the twentieth and twenty-first floors of Two North Riverside Plaza in Chicago, Illinois. The initial term of the lease is approximately five years, with one5-year renewal option. The lease payment is approximately $0.5 million for the initial year beginning in 2016, and $0.8 million annually thereafter. This lease was approved by the Audit Committee of the Board of Trustees on June 16, 2015.

Effective June 1, 2014, we entered into a one-year license agreement with Equity Group Investments, a private investment firm (Equity Group), to use office space on the sixth floor at Two North Riverside Plaza in Chicago, Illinois. The license fee was $0.2 million for the initial year. The license fee includes the non-exclusive use of additional areas on the sixth floor (such as conference rooms and common areas), certain administrative services (such as mail room services and reception desk staffing), office equipment, office furniture, supplies, licensee’s share of building operating expenses and real estate taxes and access to one parking space. Mr. Zell, our Chairman, is the Chairman and Chief Executive Officer of Equity Group, and Mr. Helfand, our President and Chief Executive Officer, is the Co-President of Equity Group. This license agreement was approved by the Audit Committee of the Board of Trustees and was scheduled to expire on May 31, 2015. On May 4, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the license agreement through November 30, 2015. The license fee payment is approximately $0.1 million for the extended term. On November 2, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the license agreement through January 31, 2016, for a maximum license fee payment of approximately $0.1 million. The extension of the license agreement was terminated as of December 30, 2015.

Effective June 1, 2014, we entered into a one-year lease with one3-month renewal option with Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman, to occupy office space on the fourteenth floor at Two North Riverside Plaza in Chicago, Illinois. The lease payment was $0.2 million for the initial term. This lease was terminated, effective January 31, 2015. This lease was approved by the Audit Committee of the Board of Trustees.

Effective July 31, 2014, we entered into a sublease with Equity Residential Management, L.L.C. to occupy office space on the tenth floor of Two North Riverside Plaza in Chicago, Illinois. Equity Residential Management, L.L.C. leases the space from Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman. The initial term of the sublease was approximately seven months commencing on or about October 22, 2014, expiring on May 31, 2015, with one3-month renewal option. The sublease payment was approximately $0.2 million for the initial term. This sublease was approved by the Audit Committee of the Board of Trustees. On May 4, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the sublease through November 30, 2015. The sublease payment is approximately $0.2 million for the extended term. On November 2, 2015, the Audit Committee of the Board of Trustees approved an agreement to extend the term of the sublease through January 31, 2016, for a maximum sublease payment of approximately $0.1 million. The extension of the sublease was terminated as of December 30, 2015.

Related/Corvex: On July 31, 2014, at the reconvened session of our 2014 annual meeting of shareholders, our shareholders voted to approve the reimbursement of approximately $33.5 million of expenses incurred by Related/Corvex in connection with their consent solicitations to remove our former Trustees and elect the new Board of Trustees and to engage in related litigation. Approximately $16.7 million was paid during the year ended December 31, 2014.  Approximately $8.4 million was to be reimbursed only if the average closing price of our common shares is at least $26.00 (as adjusted for any share splits or share dividends) during the one year period after the date on which the reimbursement was approved by shareholders, and the remaining approximately $8.4 million will be reimbursed only if the average closing price of our common shares is at least $26.00 (as adjusted for any share splits or share dividends) during the one year period between the first and second anniversaries of the date on which the reimbursement was approved by shareholders. The average closing price of our common shares was at least $26.00 during the first one year period after the date on which the reimbursement was approved by shareholders, and in August 2015, we paid $8.4 million to Related/Corvex.

Transactions with Prior Related Persons:

RMR: Prior to entering into the Termination and Cooperation Agreement with RMR, as further described below, we had three primary agreements with RMR and its affiliates to provide management and administrative services to us: (i) a business management agreement, which relates to our business generally, (ii) a property management agreement, which relates to our property level operations, and (iii) an Australia business and property management agreement, which relates to our Australian properties.

During the time we were externally managed by RMR, one of our former Managing Trustees, Mr. Barry Portnoy, was Chairman, majority owner and an employee of RMR. Another former Managing Trustee and our former President, Mr. Adam Portnoy, is the son of Mr. Barry Portnoy, and was an owner, President, Chief Executive Officer and a director of RMR. Mr. John Popeo, our former Treasurer and Chief Financial Officer, and Mr. David Lepore, our former Chief Operating Officer, were also officers of RMR. Two of our former independent Trustees served as independent directors or independent trustees of other public companies to which RMR provided management services. Mr. Barry Portnoy served as a managing director or managing trustee of a majority of the public companies to which RMR or its affiliate provided management services and Mr. Adam Portnoy served as a managing trustee of a majority of those companies. In addition, officers of RMR served as officers of those companies. As a result of the removal, effective March 25, 2014, of Mr. Barry Portnoy and Mr. Adam Portnoy as Trustees of the Company and the resignation on May 23, 2014, of Mr. Adam D. Portnoy, Mr. John C. Popeo, Mr. David M. Lepore and other officers of RMR from their respective positions as officers of the Company, they, RMR, RMR Australia Asset Management Pty Limited, or RMR Australia, GOV, SIR and AIC have ceased to be related persons of the Company. Therefore, we only present related person transactions with these entities through June 30, 2014.

On December 19, 2013, we and RMR entered into an amended and restated business management agreement, effective with respect to services performed on and after January 1, 2014. Under the terms of this amended and restated business management agreement:

• The annual amount of the base management fee which was to be paid to RMR by us for each applicable period was to be equal to the lesser of:

• the sum of (a) 0.7% of the average historical cost of our real estate investments during such period up to $250.0 million, plus (b) 1.0% of the average historical cost of our real estate investments located outside the United States, Puerto Rico and Canada during such period, plus (c) 0.5% of the average historical cost of our real estate investments during such period exceeding $250.0 million and the average historical cost of our real estate investments located outside the United States, Puerto Rico and Canada combined; and

• the sum of (a) 0.7% of the average closing price per share of our common shares on the NYSE, during such period, multiplied by the average number of our common shares outstanding during such period, plus the daily weighted average of the aggregate liquidation preference of each class of our preferred shares outstanding during such period, plus the daily weighted average of the aggregate principal amount of our consolidated indebtedness during such period, or, together, our Average Market Capitalization, up to $250.0 million, plus (b) 1.0% of the average historical cost of our real estate investments located outside the United States, Puerto Rico and Canada during such period, plus (c) 0.5% of our Average Market Capitalization exceeding $250.0 million and the average historical cost of our real estate investments located outside the United States, Puerto Rico and Canada during such period combined.

The average historical cost of our real estate investments will include our consolidated assets invested, directly or indirectly, in equity interests in or loans secured by real estate and personal property owned in connection with such real estate (including acquisition related costs and costs which may be allocated to intangibles or are unallocated), all before reserves for depreciation, amortization, impairment charges or bad debts or other similar noncash reserves. Our investment in SIR (or in any other company which has a management agreement with RMR) is not counted for purposes of calculating the fees payable by us to RMR.

• Although the fee calculation is stated in annual percentages, the base management fee is paid monthly to RMR, ninety percent (90%) in cash and ten percent (10%) in our common shares, which shall be fully-vested when issued. The number of our common shares to be issued in payment of the base management fee for each month is equal to the value of 10.0% of the total base management fee for that month divided by the average daily closing price of our common shares during that month.

• The incentive management fee which may be earned by RMR for an annual period will be an amount, subject to a cap based on the value of our outstanding common shares, equal to 12.0% of the product of (a) our equity market capitalization on the last trading day on the year immediately prior to the relevant measurement period, and (b) the amount (expressed as a percentage) by which the total returns per share realized by the holders of our common shares (i.e., share price appreciation plus dividends) exceeds the total shareholder return of the SNL Office REIT Index (in each case subject to certain adjustments) for the relevant measurement period. The measurement periods are generally three-year periods ending with the year for which the incentive management fee is being calculated, with shorter periods applicable in the case of the calculation of the incentive management fee for 2014 (one year) and 2015 (two years).

• The incentive management fee is payable in our common shares, with one-third of our common shares issued in payment of an incentive management fee vested on the date of issuance, and the remaining two-thirds vesting thereafter in two equal annual installments. If the issuance of common shares in payment of a portion of the base management fee or incentive management fee would be limited by applicable law and regulations, such portion of the applicable fee will instead be paid in cash.

• RMR and certain eligible transferees of our common shares issued in payment of the base management fee or incentive management fee are entitled to demand registration rights, exercisable not more frequently than twice per year, and to "piggy-back" registration rights, with certain expenses to be paid by us. We and applicable selling shareholders also have agreed to indemnify each other (and their officers, trustees, directors and controlling persons) against certain liabilities, including liabilities under the Securities Act in connection with any such registration.

Pursuant to our business management agreement with RMR as described above, we recognized business management fee expense of $31.7 million for the six months ended June 30, 2014. The fees for the six months ended June 30, 2014, include estimated 2014 incentive fees payable in common shares based on our common share total return. These amounts are included in general and administrative expenses, in our consolidated financial statements. In accordance with the terms of our business management agreement, as amended in December 2013, we issued 68,206 of our common shares to RMR for the six months ended June 30, 2014 as payment for 10% of the base business management fee we recognized for such period.

For 2013, our business management agreement provided for the base business management fee to be paid to RMR at an annual rate equal to (a) 0.7% of the historical cost of our real estate investments, as described in the business management agreement, located in the United States, Puerto Rico or Canada, for the first $250.0 million of such investments, and 0.5% thereafter, plus (b) 1.0% of the historical cost of our real estate investments located outside the United States, Puerto Rico and Canada. In addition, for 2013, our business management agreement provided for RMR to be paid an incentive fee equal to 15.0% of the product of (i) the weighted average of our common shares outstanding on a fully diluted basis during a fiscal year and (ii) the excess, if any, of the FFO Per Share, as defined in the business management agreement, for such fiscal year over the FFO Per Share for the preceding fiscal year. Our investments in GOV and SIR, which are described below, were not counted for purposes of determining the business management fees payable by us to RMR; however, we reported the business management fees payable to RMR by SIR in our consolidated 2013 results until we deconsolidated our investment in SIR on July 2, 2013. The business management fees, we and SIR (while SIR was a consolidated subsidiary of ours) recognized on a consolidated basis were $43.3 million for 2013. This amount is included in general and administrative expenses and income from discontinued operations, as appropriate, in our consolidated financial statements. No incentive fees were paid by us to RMR for 2013.

Our property management agreement with RMR provided for management fees equal to 3.0% of gross collected rents and construction supervision fees for construction equal to 5.0% of construction costs. The aggregate property management and construction supervision fees we and SIR (while SIR was a consolidated subsidiary of ours) recognized on a consolidated basis were $13.8 million for the six months ended June 30, 2014, and $32.5 million for 2013. These amounts are included in operating expenses and income from discontinued operations or have been capitalized, as appropriate, in our consolidated financial statements.

MacarthurCook Fund Management Limited (MacarthurCook) previously provided us with business and property management services related to our Australian properties. Our contract with MacarthurCook terminated on January 31, 2013, and on that date we entered into a business and property management agreement (Australia Management Agreement) with RMR Australia for the benefit of CWH Australia Trust, a subsidiary of ours (CWHAT). RMR Australia is owned by two of our former Trustees and our former President and it has been granted an Australian financial services license by the Australian Securities & Investments Commission. The Australia Management Agreement provides for compensation to RMR Australia for business management and real estate investment services at an annual rate equal to 0.5% of the average historical cost of CWHAT's real estate investments, as described in the Australia Management Agreement. The Australia Management Agreement also provides for additional compensation to RMR Australia (i) for property management services at an annual rate equal to 50% of the difference between 3.0% of collected gross rents and the aggregate of all amounts paid or payable by or on behalf of CWHAT to third party property managers, and (ii) for construction supervision services at an annual rate equal to 50% of the difference between 5.0% of constructions costs and any amounts paid to third parties for construction management and/or supervision. Similar to our prior arrangement with respect to fees we paid to MacarthurCook, RMR has agreed to waive half of the fees payable by us under our property management agreement with RMR and half of the business management fees otherwise payable by us under our business management agreement with RMR related to real estate investments that are subject to the Australia Management Agreement for so long as the Australia Management Agreement is in effect and we or any of our subsidiaries are paying the fees under that agreement. The aggregate business and property management fees we recognized pursuant to the Australia Management Agreement were $0.9 million for the six months ended June 30, 2014, which amounts are equal to the fees waived by RMR and excluded from the amount that was payable to RMR during the six months ended June 30, 2014.  Pursuant to the Australia Management Agreement, we recognized aggregate business and property management fees of $1.6 million for the year ended December 31, 2013, which amount is equal to the fees waived by RMR and excluded from the amounts that were payable to RMR during 2013.

For January 2013, with respect to our investments in Australia, RMR agreed to waive half of the fees payable by us under our property management agreement and half of the business management fees related to real estate investments located outside of the United States, Puerto Rico and Canada, so long as our business and property management agreement with MacarthurCook, with respect to those investments, was in effect and we or any of our subsidiaries were paying fees under that agreement. MacarthurCook earned $0.2 million in January 2013, with respect to our Australian properties, which amounts are equal to the fees waived by RMR and excluded from the amounts that were payable to RMR during those periods.

RMR also provided internal audit services to us in return for our share of the total internal audit costs incurred by RMR for us and other publicly owned companies managed by RMR and its affiliates, which amounts were subject to approval by our former Compensation Committee. Our former Audit Committee appointed our Director of Internal Audit. Our and SIR's (while SIR was a consolidated subsidiary of ours) share of RMR's costs of providing this internal audit function was, on a consolidated basis, approximately $0.3 million for 2013, which amounts are included in general and administrative expenses in our consolidated financial statements. These allocated costs are in addition to the business and property management fees we and SIR paid to RMR.

RMR also leased from us office space for eleven of its regional offices. We earned approximately $0.4 million for the six months ended June 30, 2014 and $0.8 million in rental income from RMR in 2013, with respect to approximately 36,500 square feet of office space, which we believe was commercially reasonable rent for this office space, not all of which was leased to RMR for the entire three-year period. These leases were terminated when our management agreements with RMR terminated.

Under our share award plans, we granted restricted shares to certain employees of RMR, some of whom are our former officers. We granted a total of 73,450 restricted shares with an aggregate value of $1.7 million to such persons in 2013, based on upon the closing price of our common shares on the NYSE on the dates of grants. One fifth of those restricted shares vested on the grant dates and one fifth vests on each of the next four anniversaries of the grant dates. These share grants to RMR employees were in addition to the fees we pay to RMR. On occasion, we have entered into arrangements with former employees of RMR in connection with the termination of their employment with RMR, providing for the acceleration of vesting of restricted shares previously granted to them under our share award plan. Additionally, each of our former President, former Treasurer and former Chief Financial Officer and former Senior Vice President and former Chief Operating Officer received grants of restricted shares of other companies to which RMR provides management services in their capacities as officers of RMR. As a result of the removal of our former Trustees on March 25, 2014, the vesting of common shares previously issued to our former officers and certain employees of RMR pursuant to our equity compensation plans accelerated in accordance with the terms of their governing share grants (Note 14).

Termination and Cooperation Agreement: On September 30, 2014, we entered into a termination and cooperation agreement (Cooperation Agreement) with RMR and RMR Australia (together, Manager). Under the terms of the agreement, the existing business and property management agreements with RMR terminated effective September 30, 2014.

Pursuant to the Cooperation Agreement, through February 28, 2015, Manager agreed to use best efforts to assist us in the transition of our management and operations. We paid Manager $1.2 million per month for transition services from October 1, 2014 to February 28, 2015, which included continued management and other services for the Australian assets pursuant to the Australian Management Agreement. Beginning March 1, 2015, we agreed to pay Manager $0.1 million per month until we no longer required such services or until the Australia Management Agreement was terminated, which was terminated in the third quarter of 2015, effective October 31, 2015. There is no future obligation to pay any fees to Manager.

RMR is responsible for any severance payments to its employees. We paid accrued vacation benefits for any of Manager’s employees that were terminated as a result of the transition and we paid Manager the $15.3 million pro-rata portion of the current year’s incentive fee under the existing business management agreement for the period from January 1, 2014 to September 30, 2014. This incentive fee relates to the business management agreement entered into prior to the election of our new Board of Trustees on May 23, 2014. There is no future obligation to pay an incentive fee to RMR.

GOV:    GOV was formerly our 100% owned subsidiary. In 2009, GOV completed an initial public offering pursuant to which GOV ceased to be a majority owned subsidiary of ours. To facilitate this offering, we and GOV entered into a transaction agreement that governs our separation from and relationship with GOV. Pursuant to this transaction agreement and subject to certain conditions, among other things, we granted GOV the right of first purchase to acquire any property owned by us that we determine to divest (including sale, mortgage or other financing), if the property is then, or is reasonably expected within twelve (12) months to be, majority leased to a government tenant, which right of first purchase will also apply in the event of an indirect sale of any such properties as a result of a change of control of us. On July 23, 2014, we and GOV entered into a letter agreement whereby GOV irrevocably waived and released us from the right of first purchase described above. Additionally, pursuant to the letter agreement we and GOV each agreed to waive certain consent rights over the other party’s investments in certain categories of properties.

During the time we were externally managed by RMR, RMR provided management services to both us and GOV, two of our former Trustees and our former President were managing trustees of GOV and GOV’s executive officers were officers of RMR. On March 15, 2013, we sold all of our 9,950,000 common shares of GOV in a public offering for net proceeds (after deducting underwriters' discounts and commissions and expenses) of $239.6 million and we realized a gain of $66.3 million. In connection with this public offering, on March 11, 2013, we entered into a registration agreement with GOV under which we agreed to pay all expenses incurred by GOV relating to the registration and sale of our GOV common shares. We incurred and paid $0.3 million of reimbursements to GOV pursuant to this agreement during 2013. In addition, under the registration agreement, GOV agreed to indemnify us and our officers, Trustees and controlling persons, and we agreed to indemnify GOV and its officers, trustees and controlling persons, against certain liabilities related to the public offering, including liabilities under the Securities Act of 1933, as amended, (Securities Act).

SIR:  SIR was formerly our 100% owned subsidiary. In March 2012, SIR completed an initial public offering, or the SIR IPO. As of June 30, 2014, we owned 22,000,000 common shares of SIR, which represented approximately 36.7% of SIR’s outstanding common shares. Two of our former Trustees and our former President were managing trustees of SIR and our former Treasurer and Chief Financial Officer served as the treasurer and chief financial officer of SIR and SIR’s executive officers were officers of RMR. In addition, one of our former independent Trustees was an independent trustee of SIR.

In March 2012, SIR completed an initial public offering pursuant to which it issued 9,200,000 of its common shares for net proceeds (after deducting underwriters' discounts and commissions and expenses) of $180.8 million. SIR applied those net proceeds, along with proceeds from drawings under SIR's revolving credit facility, to repay in full a $400.0 million demand promissory note that we received from SIR on February 16, 2012, along with 22,000,000 SIR common shares (including SIR common shares that had been previously issued to us in connection with SIR's formation), in exchange for our transfer to SIR of 79 properties (251 separate buildings or land parcels with a combined approximately 21,400,000 rentable square feet). SIR also reimbursed us for costs that we incurred in connection with SIR's organization and preparation for the SIR IPO.

In March 2013, we entered into a registration agreement with SIR, pursuant to which SIR agreed to, among other things, file a registration statement with respect to an offering of up to all of the 22,000,000 common shares of SIR that we owned, and SIR filed a registration statement on Form S-3 to permit the resale by us of some or all of the common shares of SIR we owned. Under the registration agreement, we agreed to pay all expenses incurred by SIR relating to the registration and sale of the shares in an offering. We incurred and paid $0.6 million of reimbursements to SIR pursuant to this agreement. By letter dated March 31, 2014, SIR notified us that, effective that same day, SIR had elected to terminate the registration agreement with us as a result of the removal of all the former Trustees effective March 25, 2014, which constituted a change of control of us as provided in that agreement. The letter also noted that SIR would welcome the opportunity to meet with our new Board of Trustees to discuss mutually beneficial arrangements regarding the registration of the shares of SIR owned by EQC.  On July 9, 2014, we sold our entire stake of 22,000,000 common shares of SIR, for $32.04 per share, raising aggregate gross proceeds of $704.8 million.  As a result of this sale, we no longer hold any interest in SIR.

AIC:  We previously owned 12.5% of AIC, an Indiana insurance company, and, as of May 9, 2014, had invested $5.2 million in AIC since we became an equity owner of AIC in 2009. RMR, GOV, SIR and four other companies to which RMR provides management services also own shares of AIC. During the time we were externally managed by RMR, RMR provided management and administrative services to AIC pursuant to a management and administrative services agreement with AIC and a majority of the former Trustees, our former President and most of the trustees and directors of the other AIC shareholders served on the board of directors of AIC. On March 25, 2014, as a result of the removal of the former Trustees, we underwent a change in control, as defined in the shareholders’ agreement among us, the other shareholders of AIC and AIC. As a result of that change in control and in accordance with the terms of the shareholders agreement, the other shareholders of AIC, on May 9, 2014, exercised their right to purchase the 20,000 shares of AIC we then owned. We received $5.8 million in aggregate proceeds from this sale and we no longer own any interest in AIC.

We previously purchased property insurance providing $500.0 million of coverage pursuant to an insurance program arranged by AIC and with respect to which AIC was a reinsurer of certain coverage amounts. This program expired in June 2014. We paid AIC a premium, including taxes and fees, of approximately $6.0 million in connection with that policy.

Indemnification:  Pursuant to our declaration of trust and separate indemnification agreements, we have advanced amounts incurred for legal fees and costs on behalf of certain of the former Trustees and officers with respect to the legal proceedings described in Part I, Item 3, “Legal Proceedings” in this Annual Report on Form 10-K. Pursuant to indemnification provisions in our business and property management agreements with RMR, we have also incurred legal fees and costs on behalf of RMR for claims brought against RMR in its capacity as our business and property manager with respect to certain legal proceedings described in Part I, Item 3, “Legal Proceedings” in this Annual Report on Form 10-K. For the six months ended June 30, 2014, we incurred approximately $5.4 million in such legal fees and costs, and for the year ended December 31, 2013, we incurred approximately $30.4 million in such legal fees and costs, including our costs.

Settlement of Certain Tenant Litigation: On March 1, 2014, pursuant to mediation, we and an affiliate of RMR agreed to terms of a settlement of a long running litigation with an unrelated third party that was a tenant, or the Tenant, of two separate properties: one property owned by us and one property owned by the RMR affiliate. This litigation arose as a result of flooding in 1999 and 2001 at both of these properties. After the flooding, the Tenant filed a complaint seeking declaratory and injunctive relief providing that Tenant was no longer obligated to pay rent at the two properties in question and brought claims against EQC and the RMR affiliate, as landlords, for, among other things, breach of the covenants of quiet enjoyment and habitability. We and RMR counterclaimed, seeking damages based in part upon Tenant’s failure to pay rent and make repairs. The settlement agreement regarding this litigation provides for a payment by Tenant of $12.0 million to EQC and the RMR affiliate, payable in three installments ($6.0 million on June 30, 2014 and $3.0 million on each of September 30, 2014 and December 31, 2014), split pro-rata between EQC and the RMR affiliate based upon the balance of the rent due under each lease. The total rent due under the EQC lease was approximately $9.2 million; the total rent due under the lease with the RMR affiliate was approximately $1.1 million. This settlement was approved by the court on May 6, 2014.

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Selected Quarterly Financial Data

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (Unaudited)

Selected Quarterly Financial Data (Unaudited)

The following is a summary of our unaudited quarterly results of operations for 2015 and 2014 (dollars in thousands):

	2015
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Total revenues	$	213,055	$	203,694	$	159,208	$	138,934
Net income attributable to Equity Commonwealth common shareholders	6,649		5,635		23,485		36,164
Net income attributable to Equity Commonwealth common shareholders per share—basic	0.05		0.04		0.18		0.29
Net income attributable to Equity Commonwealth common shareholders per share—diluted	0.05		0.04		0.18		0.28

The decrease in the third and fourth quarter 2015 total revenues and net income attributable to Equity Commonwealth common shareholders was primarily attributable to properties sold in the second, third and fourth quarters of 2015.

	2014
	First Quarter		Second Quarter			Third Quarter		Fourth Quarter
Total revenues	$	217,260	$	215,194		$	216,595	$	212,808
Net income (loss) attributable to Equity Commonwealth common shareholders	9,297		(17,802		)	149,759		(165,542		)
Net income (loss) attributable to Equity Commonwealth common shareholders per share—basic	0.08		(0.14		)	1.16		(1.28		)
Net income (loss) attributable to Equity Commonwealth common shareholders per share—diluted	0.08		(0.14		)	1.16		(1.28		)
Common distributions declared	0.25		—			—		—

The decrease in the second quarter 2014 net loss attributable to Equity Commonwealth common shareholders was primarily attributable to a loss on asset impairment of $22.7 million. The increase in third quarter 2014 net income attributable to Equity Commonwealth common shareholders was largely attributable to the gain on equity investment in SIR of $171.8 million. The decrease in the fourth quarter 2014 net loss attributable to Equity Commonwealth common shareholders was impacted by a loss on asset impairment of $167.1 million.

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Subsequent Events

12 Months Ended

Dec. 31, 2015

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

On February 16, 2016, we redeemed at par $139.1 million of our 6.25% senior unsecured notes due 2016.

On February 16, 2016, we sold Executive Park (9 buildings), with 427,443 square feet for $50.9 million.  

From January 1, 2016 through February 16, 2016, share buyback activity has totaled 861,162 common shares at a weighted average price of $25.94 per share.

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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2015

Valuation and Qualifying Accounts [Abstract]

Schedule II Valuation and Qualifying Accounts

Description	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions			Balance at End of Period
Year Ended December 31, 2013:
Allowance for doubtful accounts	$	9,962	$	818	$	(2,895	)	$	7,885
Year Ended December 31, 2014:
Allowance for doubtful accounts	$	7,885	$	2,196	$	(3,516	)	$	6,565
Year Ended December 31, 2015:
Allowance for doubtful accounts	$	6,565	$	4,533	$	(3,383	)	$	7,715

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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION

12 Months Ended

Dec. 31, 2015

SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]

Schedule III Real Estate and Accumulated Depreciation

				Initial Cost to Company						Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)	Land	Buildings and Improvements	Costs Capitalized Subsequent to Acquisition, Net		Impairment/Write Downs		Land	Buildings and Improvements	Total(2)	Accumulated Depreciation(3)	Date Acquired	Original Construction Date
785 Schilinger Road South	Mobile	AL	—	1,540	9,732	(3	)	—		1,540	9,729	11,269	1,990	10/22/2007	1998
Parkshore Plaza	Folsom	CA	41,275	4,370	41,749	3,063		(3	)	4,370	44,809	49,179	5,086	6/16/2011	1999
Leased Land	Gonzalez	CA	—	18,941	9,060	3,967		—		18,940	13,028	31,968	2,862	8/31/2010	-
Sky Park Centre	San Diego	CA	—	936	8,094	756		—		936	8,850	9,786	3,308	6/24/2002	1986
9110 East Nichols Avenue	Centennial	CO	—	1,708	14,616	4,002		—		1,708	18,618	20,326	6,438	11/2/2001	1984
1225 Seventeenth Street	Denver	CO	—	22,400	110,090	17,269		—		22,400	127,359	149,759	21,595	6/24/2009	1982
5073, 5075, & 5085 S. Syracuse Street	Denver	CO	—	4,720	58,890	—		—		4,720	58,890	63,610	8,343	4/16/2010	2007
1601 Dry Creek Drive	Longmont	CO	—	3,714	24,397	5,535		—		3,715	29,931	33,646	9,165	10/26/2004	1982
97 Newberry Road	East Windsor	CT	6,375	2,960	12,360	30		—		2,943	12,407	15,350	2,865	10/24/2006	1989
33 Stiles Lane	North Haven	CT	2,785	2,090	9,141	216		(1,654	)	1,799	7,994	9,793	2,161	10/24/2006	1970
1250 H Street, NW	Washington	DC	—	5,975	53,778	10,947		(2	)	5,975	64,723	70,698	26,030	6/23/1998	1992
Georgetown-Green and Harris Buildings	Washington	DC	—	24,000	35,979	44		—		24,000	36,023	60,023	5,700	9/3/2009	1960;1975
802 Delaware Avenue	Wilmington	DE	—	4,409	39,681	10,533		(11,156	)	3,390	40,077	43,467	23,091	7/23/1998	1986
6600 North Military Trail	Boca Raton	FL	—	15,900	129,790	123		—		15,900	129,913	145,813	16,224	1/11/2011	2008
Executive Park	Atlanta	GA	—	13,729	78,032	6,776		(54,313	)	10,954	33,270	44,224	14,859	7/16/2004; 7/26/2007	1972
633 Ahua Street	Honolulu	HI	—	1,256	3	18,054		(2,912	)	1,100	15,301	16,401	3,765	12/5/2003	2006
625 Crane Street	Aurora	IL	—	1,180	3,411	(2	)	(2,978	)	533	1,078	1,611	87	4/2/2007	1977
1200 Lakeside Drive	Bannockburn	IL	—	5,846	48,568	14,768		(7,610	)	5,858	55,714	61,572	12,601	12/29/2005	1999
600 West Chicago Avenue	Chicago	IL	—	34,980	315,643	12,058		—		34,980	327,701	362,681	35,679	8/10/2011	1908
8750 Bryn Mawr Avenue	Chicago	IL	—	6,600	77,764	7,400		(170	)	6,600	84,994	91,594	11,705	10/28/2010	1985
101-115 W. Washington Street	Indianapolis	IN	—	7,495	60,465	23,210		—		7,496	83,674	91,170	23,976	5/10/2005	1977
111 Monument Circle	Indianapolis	IN	—	9,670	158,085	8,556		—		9,670	166,641	176,311	13,115	10/22/2012	1959;1990
109 Brookline Avenue	Boston	MA	—	3,168	30,397	12,684		—		3,168	43,081	46,249	18,718	9/28/1995	1915
Cabot Business Park Land	Mansfield	MA	—	1,033	—	—		—		1,033	—	1,033	—	8/1/2003	-
111 Market Place	Baltimore	MD	—	6,328	54,645	16,152		—		6,328	70,797	77,125	24,753	1/28/2003	1990
25 S. Charles Street	Baltimore	MD	—	2,830	22,996	12,678		—		2,830	35,674	38,504	12,479	7/16/2004	1972
820 W. Diamond	Gaithersburg	MD	—	4,381	18,798	10,538		(35	)	4,461	29,221	33,682	11,487	3/31/1997	1995
Danac Stiles Business Park	Rockville	MD	—	7,638	62,572	6,329		(10,975	)	6,595	58,969	65,564	18,984	7/20/2004	2002

				Initial Cost to Company						Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)	Land	Buildings and Improvements	Costs Capitalized Subsequent to Acquisition, Net		Impairment/Write Downs		Land	Buildings and Improvements	Total(2)	Accumulated Depreciation(3)	Date Acquired	Original Construction Date
East Eisenhower Parkway	Ann Arbor	MI	—	6,760	46,988	1,513		—		6,760	48,501	55,261	6,836	6/15/2010	1975;2006
2250 Pilot Knob Road	Mendota Heights	MN	—	533	4,795	1,202		—		533	5,997	6,530	2,643	3/19/1998	1995
411 Farwell Avenue	South St. Paul	MN	—	1,303	10,451	4,603		—		1,304	15,053	16,357	3,526	6/2/2004	1970
6200 Glenn Carlson Drive	St. Cloud	MN	—	1,950	13,803	—		—		1,950	13,803	15,753	2,156	10/15/2009	1999
4700 Belleview Avenue	Kansas City	MO	—	1,165	3,097	2,895		—		1,165	5,992	7,157	1,029	7/17/2008	1986
111 River Street (4)	Hoboken	NJ	—	—	134,199	1,871		—		—	136,070	136,070	21,630	8/11/2009	2002
North Point Office Complex	Cleveland	OH	—	12,000	94,448	18,136		—		12,000	112,584	124,584	22,363	2/12/2008	1985;1989;1990
Raintree Industrial Park	Solon	OH	—	1,808	16,620	2,270		(8,387	)	1,339	10,972	12,311	858	7/16/2004	1975
401 Vine Street	Delmont	PA	—	1,575	5,542	—		—		1,575	5,542	7,117	1,130	10/22/2007	1999
Cherrington Corporate Center	Moon Township	PA	—	11,369	39,892	28,367		(5,454	)	11,164	63,010	74,174	21,480	9/14/1998; 8/23/1999	1987;1988; 1989;1990; 1991;1992; 1994
1500 Market Street	Philadelphia	PA	—	18,758	167,487	104,542		(388	)	18,758	271,641	290,399	78,551	10/10/2002	1974
1525 Locust Street	Philadelphia	PA	—	931	8,377	1,902		—		930	10,280	11,210	4,122	6/11/1999	1987
1600 Market Street	Philadelphia	PA	—	3,462	111,946	18,259		—		3,462	130,205	133,667	55,534	3/30/1998	1983
1735 Market Street	Philadelphia	PA	169,612	24,753	222,775	52,107		—		24,747	274,888	299,635	121,238	6/30/1998	1990
Foster Plaza	Pittsburgh	PA	—	6,168	51,588	17,969		—		6,171	69,554	75,725	19,771	9/16/2005	1987;1990; 1994; 1995; 1996
128 Crews Drive	Columbia	SC	—	2,420	4,017	1,322		(4,012	)	1,024	2,723	3,747	489	4/2/2007	1968
111 Southchase Boulevard	Fountain Inn	SC	—	520	6,822	1,734		(2,912	)	390	5,774	6,164	1,531	5/23/2007	1987
1043 Global Avenue	Graniteville	SC	—	720	15,552	603		—		720	16,155	16,875	3,537	4/2/2007	1998
633 Frazier Drive	Franklin	TN	—	5,800	13,190	(10	)	—		5,800	13,180	18,980	2,711	10/22/2007	1999
1601 Rio Grande Street	Austin	TX	—	688	6,192	1,539		(23	)	697	7,699	8,396	3,106	6/3/1999	1985
206 East 9th Street	Austin	TX	27,515	7,900	38,533	2,166		—		7,900	40,699	48,599	3,702	5/31/2012	1984
4515 Seton Center Parkway	Austin	TX	—	2,038	18,338	2,731		—		2,037	21,070	23,107	9,110	10/8/1999	1997
4516 Seton Center Parkway	Austin	TX	—	2,028	18,251	3,022		—		2,027	21,274	23,301	9,681	10/8/1999	1985
7800 Shoal Creek Boulevard	Austin	TX	—	1,731	14,921	4,614		(14	)	1,731	19,521	21,252	7,672	6/30/1999	1974
812 San Antonio Street	Austin	TX	—	626	5,636	2,564		—		621	8,205	8,826	3,115	8/18/1999	1987
8701 N Mopac	Austin	TX	—	1,574	14,168	2,677		—		1,573	16,846	18,419	6,751	8/3/1999	1982
Bridgepoint Parkway	Austin	TX	—	7,784	70,526	10,214		(97	)	7,785	80,642	88,427	37,559	12/5/1997	1986;1996;1997

					Initial Cost to Company										Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)		Land		Buildings and Improvements		Costs Capitalized Subsequent to Acquisition, Net			Impairment/Write Downs			Land		Buildings and Improvements		Total(2)		Accumulated Depreciation(3)		Date Acquired	Original Construction Date
Lakewood on the Park	Austin	TX	—		3,548		31,936		1,704			(77		)	3,548		33,563		37,111		14,554		10/20/1998	1998
Research Park	Austin	TX	—		15,859		60,175		14,601			—			18,411		72,224		90,635		29,564		10/7/1998	1968;1998; 2001
9840 Gateway Boulevard North	El Paso	TX	—		1,700		9,736		(4		)	—			1,700		9,732		11,432		1,996		10/22/2007	1999
3003 South Expressway 281	Hidalgo	TX	—		1,480		15,533		(9		)	—			1,480		15,524		17,004		3,193		10/22/2007	1999
3330 N Washington Boulevard	Arlington	VA	—		810		7,289		724			—			811		8,012		8,823		3,304		8/26/1998	1987
333 108th Avenue NE	Bellevue	WA	—		14,400		136,412		1,745			—			14,400		138,157		152,557		22,060		11/12/2009	2008
600 108th Avenue NE	Bellevue	WA	—		3,555		30,244		14,252			—			3,555		44,496		48,051		11,904		7/16/2004	1980
1331 North Center Parkway	Kennewick	WA	—		1,850		7,339		(2		)	—			1,850		7,337		9,187		1,506		10/22/2007	1999
100 East Wisconsin Avenue	Milwaukee	WI	—		3,150		72,113		7,733			—			3,150		79,846		82,996		11,433		8/11/2010	1989
111 East Kilbourn Avenue	Milwaukee	WI	—		2,400		47,562		5,143			—			2,400		52,705		55,105		10,528		6/12/2008	1988
			$	247,562	$	394,913	$	3,065,229	$	540,382		$	(113,172	)	$	389,410	$	3,497,942	$	3,887,352	$	898,939

Analysis of the carrying amount of real estate properties and accumulated depreciation:

	Real Estate Properties			Accumulated Depreciation
Balance at January 1, 2013	$	7,829,409		$	1,007,606
Additions(5)	231,485			176,777
Loss on asset impairment	(384,141		)	(185,795		)
Deconsolidation of SIR	(1,446,781		)	(56,023		)
Properties reclassified to discontinued operations	(552,024		)	(15,471		)
Disposals	(140,783		)	(32,035		)
Balance at December 31, 2013	5,537,165			895,059
Additions(5)	70,963			164,815
Loss on asset impairment	(191,490		)	(6,423		)
Properties reclassified to continuing operations	341,024			5,724
Disposals	(29,219		)	(28,730		)
Balance at December 31, 2014	5,728,443			1,030,445
Additions(5)	68,118			144,844
Loss on asset impairment	(17,162		)	—
Disposals	(1,892,047		)	(276,350		)
Balance at December 31, 2015	$	3,887,352		$	898,939

(1) Excludes net unamortized premiums and discounts.

(2) Excludes value of real estate intangibles. Aggregate cost for federal income tax purposes is approximately $4,160,805.

(3) Depreciation is calculated using the straight line method over estimated useful lives of up to 40 years for buildings and improvements and up to 12 years for personal property.

(4) Property is subject to a ground lease.

(5) Includes adjustments to real estate properties additions of $(13,217), $(20,445) and $(40,020), and adjustments to accumulated depreciation additions of $(887), $(1,279) and $(1,528), related to changes in foreign currency exchange rates during 2015, 2014 and 2013, respectively.

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SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE (Schedule)

12 Months Ended

Dec. 31, 2015

Mortgage Loans on Real Estate [Abstract]

Schedule IV Mortgage Loans on Real Estate

Location	Interest Rate	Final Maturity Date	Periodic Payment Terms	Face Amount of Mortgage(1)			Carrying Amount of Mortgage		Principal Amount of Loans Subject to Delinquent Principal or Interest
Salina, NY	6.00%	4/30/2019	Interest payable monthly in arrears. $419 due at maturity.	$	419		399		$	—
Dearborn, MI	6.00%	1/24/2023	Interest payable monthly in arrears. $7,688 due at maturity.	7,688			7,688		—
				$	8,107		$	8,087	$	—
Reconciliation of the carrying amount of mortgage loans at the beginning of the period:
Balance at January 1, 2013				$	1,419
New mortgage loans				7,688
Collections of principal				(1,000		)
Balance at December 31, 2013				$	8,107
Balance at December 31, 2014				$	8,107
Balance at December 31, 2015				$	8,107

(1) Also represents cost for federal income tax purposes.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation.    The consolidated financial statements include our investments in 100% owned subsidiaries and majority owned subsidiaries that are controlled by us. References to we, us, our and the Company, refer to Equity Commonwealth and its consolidated subsidiaries as of December 31, 2015, unless the context indicates otherwise. The portion of a consolidated subsidiary that is not controlled by us, or the noncontrolling interest, is presented as a separate component of equity in our consolidated balance sheets. In addition, net income attributable to the noncontrolling interest is presented separately in our consolidated statements of operations. All intercompany transactions and balances have been eliminated.

We account for our investments in 50% or less owned companies, including our investments in SIR (beginning on July 2, 2013 when SIR ceased to be our consolidated subsidiary through the sale date on July 9, 2014), GOV (until March 15, 2013, when we sold all of our GOV common shares) and Affiliates Insurance Company, or AIC (until May 9, 2014, when we sold all of our AIC shares), over which we can exercise influence, but do not control, using the equity method of accounting. We used the income statement method to account for issuance of common shares of beneficial interest by SIR and GOV, and shares of common stock by AIC. Under this method, gains and losses reflecting changes in the value of our investments at the date of issuance of additional common shares by SIR and GOV, or common stock by AIC, are recognized in our income statement.

Real Estate Properties

Real Estate Properties.    We record real estate properties at cost. We depreciate real estate investments on a straight line basis over estimated useful lives of up to 40 years for buildings and improvements, and up to 12 years for personal property.

Each time we enter into a new lease, or materially modify an existing lease, we evaluate its classification as either a capital or operating lease. The classification of a lease as capital or operating affects the carrying value of a property, as well as our recognition of rental payments as revenue. These evaluations require us to make estimates of, among other things, the remaining useful life and fair market value of a leased property, appropriate discount rates and future cash flows.

We allocate the consideration paid for our properties among land, buildings and improvements and, for properties that qualify as acquired businesses under the Business Combinations Topic of the FASB Accounting Standards Codification™, or the Codification, to identified intangible assets and liabilities, consisting of the value of above market and below market leases, the value of acquired in place leases and the value of tenant relationships. Purchase price allocations and the determination of useful lives are based on our estimates and, under some circumstances, studies from independent real estate appraisal firms to provide market information and evaluations that are relevant to our purchase price allocations and determinations of useful lives; however, we are ultimately responsible for the purchase price allocations and determination of useful lives.

We allocate the consideration to land, buildings and improvements based on a determination of the fair values of these assets assuming the property is vacant. We determine the fair value of a property using methods that we believe are similar to those used by independent appraisers. Purchase price allocations to above market and below market leases are based on the estimated present value (using an interest rate which reflects our assessment of the risks associated with the leases acquired) of the difference between (1) the contractual amounts to be paid pursuant to the acquired in place leases and (2) our estimate of fair market lease rates for the corresponding leases, measured over a period equal to the remaining non-cancelable terms of the respective leases. Purchase price allocations to acquired in place leases and tenant relationships are determined as the excess of (1) the purchase price paid for a property after adjusting existing in place leases to estimated market rental rates over (2) the estimated fair value of the property as if vacant. We aggregate this value between acquired in place lease values and tenant relationships based on our evaluation of the specific characteristics of each tenant's lease; however, the value of tenant relationships has not been separated from acquired in place lease value for our properties because we believe such value and related amortization expense is immaterial for acquisitions reflected in our historical financial statements. We consider certain factors in performing these analyses including estimates of carrying costs during the expected lease up periods, including real estate taxes, insurance and other operating income and expenses and costs to execute similar leases in current market conditions, such as leasing commissions, legal and other related costs. If we believe the value of tenant relationships is material in the future, those amounts will be separately allocated and amortized over the estimated lives of the relationships. We recognize the excess, if any, of the consideration paid over amounts allocated to land, buildings and improvements and identified intangible assets and liabilities as goodwill and we recognize gains if amounts allocated exceed the consideration paid.

We amortize capitalized above market lease values (presented in our consolidated balance sheets as acquired real estate leases) as a reduction to rental income over the remaining terms of the respective leases. We amortize capitalized below market lease values (presented in our consolidated balance sheets as assumed real estate lease obligations) as an increase to rental income over the remaining terms of the respective leases. We amortize the value of acquired in place leases exclusive of the value of above market and below market acquired in place leases to expense over the remaining terms of the respective leases. If a lease is terminated prior to its stated expiration, the unamortized lease intangibles relating to that lease is written off.

We review our properties for impairment quarterly, or whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. Impairment indicators may include declining tenant occupancy, lack of progress releasing vacant space, tenant bankruptcies, low long term prospects for improvement in property performance, weak or declining tenant profitability, cash flow or liquidity, our decision to dispose of an asset before the end of its estimated useful life. When indicators of potential impairment are present that suggest that the carrying amounts of real estate assets may not be recoverable, we assess the recoverability of these assets by determining whether the respective carrying values will be recovered through the estimated undiscounted future operating cash flows expected from the use of the assets and their eventual disposition. The determination of undiscounted cash flow includes consideration of many factors including income to be earned from the investment, holding costs (exclusive of interest), estimated selling prices, and prevailing economic and market conditions. In the event that such expected undiscounted future cash flows do not exceed the carrying values, we estimate the fair value of the assets and record an impairment charge equal to the amount by which the carrying value exceeds the estimated fair value. Estimated fair values are calculated based on the following information, (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of future cash flows. During the years ended December 31, 2015 and 2014, we recorded a loss on asset impairment in continuing operations totaling $17.2 million and $185.1 million, respectively, to reduce the carrying value of properties to their estimated fair values (see Note 16).

When we classify properties as held for sale, we discontinue the recording of depreciation expense and estimate their fair value less costs to sell. If we determine that the carrying value for these properties exceed their estimated fair value less costs to sell, we record a loss on asset impairment. During the year ended December 31, 2013, we recorded a loss on asset impairment of $79.8 million in discontinued operations and a loss on asset impairment of $124.3 million in continuing operations to reduce the carrying value of 39 properties (93 buildings) classified as held for sale to their estimated fair value less costs to sell. In addition, we recorded losses on asset impairment for properties sold during 2013 totaling $23.1 million.

Certain of our real estate assets contain hazardous substances, including asbestos. We believe any asbestos in our buildings is contained in accordance with current regulations, and we have no current plans to remove any such asbestos. If we remove the asbestos or renovate or demolish these properties, certain environmental regulations govern the manner in which the asbestos must be handled and removed. We do not believe that there are other environmental conditions at any of our properties that have a material adverse effect on us. However, no assurances can be given that such conditions are not present in our properties or that other costs we incur to remediate contamination will not have a material adverse effect on our business or financial condition. As of December 31, 2015, we did not have any accrued environmental remediation costs. As of December 31, 2014, accrued environmental remediation costs by us totaling $0.5 million were included in accounts payable and accrued expenses in our consolidated balance sheets.

Cash and Cash Equivalents

Cash and Cash Equivalents.    Our cash and cash equivalents consists of cash maintained in time deposits, depository accounts and money market accounts.  From time-to-time we may also invest in various U.S. government securities.  We continually monitor the credit ratings of the financial institutions holding our deposits to minimize our exposure to credit risk.  Throughout the year, we have cash balances in excess of federally insured limits deposited with various financial institutions. We do not believe we are exposed to any significant credit risk on cash and cash equivalents.

Restricted Cash

Restricted Cash.    Restricted cash consists of amounts escrowed for future real estate taxes, insurance, leasing costs, capital expenditures and debt service, as required by some of our mortgage debts, as well as security deposits paid to us by some of our tenants.

Other Assets, Net

Other Assets, Net.    Other assets consist principally of deferred financing fees, deferred leasing costs, capitalized lease incentives and prepaid property operating expenses. Deferred financing fees include issuance costs related to borrowings and are capitalized and amortized over the terms of the respective loans. Deferred leasing costs include brokerage, legal and other fees associated with the successful negotiation of leases and are amortized on a straight line basis over the terms of the respective leases. Capitalized lease incentives are amortized on a straight line basis against rental income over the terms of the respective leases.

Accounting Policy for Derivative Instruments

Accounting Policy for Derivative Instruments.    The Derivatives and Hedging Topic of the Codification requires companies to recognize all their derivative instruments as either assets or liabilities in the statement of financial position at fair value. The accounting for changes in the fair value of a derivative instrument depends on whether such instrument has been designated and qualifies as part of a hedging relationship and, further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, we must designate the hedging instrument, based upon the exposure being hedged, as a fair value hedge, cash flow hedge or a hedge of a net investment in a foreign operation. In December 2009, we entered into interest rate swap agreements that qualify as cash flow hedges.

We are exposed to certain risks relating to our ongoing business operations. The primary risk managed by using derivative instruments is interest rate risk. Interest rate swaps are entered into to manage interest rate risk associated with our floating rate borrowings. We designate interest rate swaps as cash flow hedges of floating rate borrowings.

Revenue Recognition

Revenue Recognition.    Rental income from operating leases, which includes rent concessions (including free rent and other lease incentives) and scheduled increases in rental rates during the lease term, is recognized on a straight line basis over the life of the lease agreements. We defer the recognition of contingent rental income, such as percentage rents, until the specific targets that trigger the contingent rental income are achieved. Tenant reimbursements and other income includes property level operating expenses reimbursed by our tenants, as well as other incidental revenues, which are recorded as expenses are incurred.

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts.    We maintain an allowance for doubtful accounts for estimated losses resulting from the inability or unwillingness of certain tenants to make payments required under their leases. The computation of the allowance is based on the tenants' payment histories and current credit profiles, as well as other considerations.

Share-Based Compensation

Share-Based Compensation. All share-based compensation is measured at fair value on the grant date or date of modification, as applicable, and recognized in earnings over the requisite service period. Depending upon the settlement terms of the awards, all or a portion of the fair value of share-based awards may be presented as a liability or as equity in the consolidated balance sheets.

Earnings Per Common Share

Earnings Per Common Share.    Earnings per common share, or EPS, is computed using the weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if our series D convertible preferred shares or our restricted share units (RSUs) were converted into our common shares, which could result in a lower EPS amount. The effect of our series D convertible preferred shares on income from continuing operations and net income attributable to common shareholders is anti-dilutive for all periods presented.

Reclassifications

Reclassifications.    Reclassifications have been made to the prior years' financial statements and notes to conform to the current year's presentation.

Income Taxes

Income Taxes.    We are a REIT under the Internal Revenue Code of 1986, as amended, and are generally not subject to federal and state income taxes provided we distribute our taxable income to our shareholders and meet other requirements for qualifying as a real estate investment trust. However, we are subject to certain state and local taxes without regard to our REIT status.

The Income Taxes Topic of the Codification prescribes how we should recognize, measure and present in our financial statements uncertain tax positions that have been taken or are expected to be taken in a tax return. Deferred tax assets are recognized to the extent that it is "more likely than not" that a particular tax position will be sustained upon examination or audit. To the extent the "more likely than not" standard has been satisfied, the benefit associated with a tax position is measured as the largest amount that has a greater than 50% likelihood of being realized upon settlement. We classify interest and penalties related to uncertain tax positions, if any, in our financial statements as a component of general and administrative expense.

Use of Estimates

Use of Estimates.    Preparation of these financial statements in conformity with U.S. generally accepted accounting principles, or GAAP, requires us to make estimates and assumptions that may affect the amounts reported in these financial statements and related notes. The actual results could differ from these estimates.

Foreign Operations

Foreign Operations.    During the year ended December 31, 2015, we sold our Australian properties (Note 4) and as of December 31, 2015, we do not have any foreign operations. The U.S. dollar was the functional currency for our consolidated subsidiaries operating in the United States prior to the sale of the Australian portfolio. The functional currency for our consolidated subsidiaries in countries other than the United States was the principal currency in which the entity's assets, liabilities, income and expenses were denominated. The functional currency of our consolidated subsidiary that operated in Australia was the Australian dollar. We translated our Australian subsidiary's financial statements into U.S. dollars when we consolidated that subsidiary's financial statements on a quarterly basis. Generally, we translated assets and liabilities at the exchange rate in effect as of the balance sheet date. The resulting translation adjustments were included in cumulative other comprehensive loss in our consolidated balance sheets. We translated income statement accounts using the average exchange rate for the period and income statement accounts that include significant non-recurring transactions at the rate in effect as of the date of the transaction. We were subject to foreign currency risk due to potential fluctuations in exchange rates between Australian and U.S. currencies.

Subsequent to the disposition of the Australian properties, we recognized a foreign currency exchange loss of $8.9 million in our consolidated statement of operations for the year ended December 31, 2015. The foreign currency exchange loss for the year ended December 31, 2015 relates to the change in foreign currency rates resulting in losses on cash proceeds from the Australian portfolio disposition maintained in an Australian bank account prior to the transfer of cash from our Australian subsidiary to our U.S bank accounts. As of December 31, 2015, we did not have any cumulative foreign currency translation adjustments as the cumulative foreign currency translation adjustment of $63.2 million was reclassified from other comprehensive loss to earnings upon disposition of the Australian properties. As of December 31, 2014, cumulative foreign currency translation adjustments were $(48.9) million.

New Accounting Pronouncements

New Accounting Pronouncements. In April 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, or ASU 2014-08.  ASU 2014-08 changes the criteria for reporting a discontinued operation.  Under the new pronouncement, a disposal of a part of an organization that has a major effect on its operations and financial results is a discontinued operation.  We adopted ASU 2014-08 on January 1, 2015, and determined that our 2015 dispositions do not individually represent a strategic shift, as defined by the standard, that has or will have a major effect on our operations and financial results. As a result, the 2015 dispositions have not been presented as discontinued operations in the 2015 statements of operations.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which provides guidance for revenue recognition. This update is effective for interim and annual reporting periods beginning after December 15, 2017.  We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs. This standard amends existing guidance to require the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of as a deferred charge. It is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. We do not expect that the adoption of this standard will have a material impact on our consolidated financial statements.

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Organization (Tables)

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Portfolio

At December 31, 2015, our portfolio included the following (square feet in thousands):

	Number of Properties	Number of Buildings	Square Feet
Total portfolio	65	127	23,952

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Real Estate Properties (Tables)

12 Months Ended

Dec. 31, 2015

Real Estate [Abstract]

Summary of Properties Disposed and Income Statement Information for Properties Included in Discontinued Operations

Summarized income statement information for properties included in discontinued operations is as follows (in thousands):

	Year Ended December 31,
	2014			2013
Rental income	$	14,243		$	55,073
Tenant reimbursements and other income	1,900			6,842
Total revenues	16,143			61,915
Operating expenses	7,138			37,027
Depreciation and amortization	—			12,550
General and administrative	10			4,268
Total expenses	7,148			53,845
Operating income	8,995			8,070
Interest and other income	2			65
Interest expense	(608		)	(1,742		)
Income from discontinued operations	$	8,389		$	6,393

During the year ended December 31, 2015, we disposed of the following properties (dollars in thousands):

Asset	Date Disposed	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
Properties
11350 North Meridian Street	January 2015	1	1	72,264	$	4,200	$	766
333 Laurel Oak Drive(1)	March 2015	—	1	27,164	2,450		251
1921 E. Alton Avenue	March 2015	1	1	67,846	14,533		4,851
46 Inverness Center Parkway	April 2015	—	—	—	2,000		1,857
225 Water Street(2)	May 2015	1	1	318,997	—		—
Sorrento Valley Business Park	June 2015	1	4	105,003	23,500		11,896
Illinois Center	August 2015	1	2	2,090,162	376,000		26,956
16th and Race Street	August 2015	1	1	608,625	43,000		7,922
185 Asylum Street	September 2015	1	1	868,395	113,250		17,619
One South Church Avenue	October 2015	1	1	240,811	32,000		4,282
775 Ridge Lake Boulevard	October 2015	1	1	120,678	16,300		(360		)
One Park Square	October 2015	1	6	259,737	34,300		9,512
Arizona Center	December 2015	1	4	1,070,724	126,000		22,838
4 South 84th Avenue	December 2015	1	1	236,007	18,000		8,393
Portfolio of properties
7450 Campus Drive	May 2015	1	1	77,411
129 Worthington Ridge Road	May 2015	1	1	227,500
599 Research Parkway	May 2015	1	1	48,249
181 Marsh Hill Road	May 2015	1	1	162,036
101 Barnes Road	May 2015	1	1	45,755
15 Sterling Drive	May 2015	1	1	173,015
35 Thorpe Avenue	May 2015	1	1	79,862
50 Barnes Industrial Road North	May 2015	1	1	154,255
5-9 Barnes Industrial Road	May 2015	1	1	38,006
860 North Main Street	May 2015	1	1	31,165
One Barnes Industrial Road South	May 2015	1	1	30,170
Village Lane	May 2015	1	2	58,185
100 Northfield Drive	May 2015	1	1	116,986
905 Meridian Lake Drive	May 2015	1	1	74,652
1717 Deerfield Road	May 2015	1	1	141,186
1955 West Field Court	May 2015	1	1	59,130
5015 S. Water Circle	May 2015	1	1	113,524
Adams Place	May 2015	1	2	230,259
Cabot Business Park	May 2015	1	2	252,755
2300 Crown Colony Drive	May 2015	1	1	45,974
Myles Standish Industrial Park	May 2015	1	2	74,800
340 Thompson Road	May 2015	1	1	25,000
100 South Charles Street	May 2015	1	1	159,616
6710 Oxon Hill	May 2015	1	1	118,336
8800 Queen Avenue South	May 2015	1	1	280,822

Asset	Date Disposed	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
9800 Sherlard Parkway	May 2015	1	1	46,765
Rosedale Corporate Plaza	May 2015	1	3	149,116
1000 Shelard Parkway	May 2015	1	1	62,499
525 Park Street	May 2015	1	1	75,636
1900 Meyer Drury Drive	May 2015	1	1	65,225
131-165 West Ninth Street	May 2015	1	1	75,517
7-9 Vreeland Road	May 2015	1	1	155,891
5 Paragon Drive	May 2015	1	1	119,089
1000 Voorhees Drive and 400 Laurel Oak Drive(1)	May 2015	1	2	125,415
1601 Veterans Highway	May 2015	1	1	63,608
Two Corporate Center Drive	May 2015	1	1	291,230
11311 Cornell Park Drive	May 2015	1	1	93,413
5300 Kings Island Drive	May 2015	1	1	159,421
3 Crown Point Court	May 2015	1	1	73,987
515 Pennsylvania Avenue	May 2015	1	1	82,000
443 Gulph Road	May 2015	1	1	21,000
4350 Northern Pike	May 2015	1	1	503,885
Thunderbolt Place	May 2015	1	2	100,505
6160 Kempsville Circle	May 2015	1	1	129,565
448 Viking Drive	May 2015	1	1	75,374
Portfolio of small office and industrial assets		45	53	5,287,790	$	376,000	$	(8,160	)
2501 20th Place South	June 2015	1	1	125,722
420 20th Street North	June 2015	1	1	514,893
Inverness Center	June 2015	1	4	475,882
701 Poydras Street	June 2015	1	1	1,256,971
300 North Greene Street	June 2015	1	1	324,305
1320 Main Street	June 2015	1	1	334,075
AL, LA, NC, SC office portfolio		6	9	3,031,848	$	417,450	$	41,596
12655 Olive Boulevard	June 2015	1	1	98,588
1285 Fern Ridge Parkway	June 2015	1	1	66,510
St. Louis portfolio(3)		2	2	165,098	$	14,300	$	(2,349	)
310-314 Invermay Road(4)	April 2015	1	1	47,480
253-293 George Town Road(4)	April 2015	1	1	143,914
7 Modal Crescent	June 2015	1	1	164,160
71-93 Whiteside Road	June 2015	1	1	303,488
9-13 Titanium Court	June 2015	1	1	69,664
16 Rodborough Road	June 2015	1	1	90,525
22 Rodborough Road	June 2015	1	1	43,427
127-161 Cherry Lane	June 2015	1	1	278,570
310-320 Pitt Street	June 2015	1	1	313,865

Asset	Date Disposed	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
44-46 Mandarin Street	June 2015	1	1	226,718
19 Leadership Way	June 2015	1	1	76,714
Australia portfolio(5)		11	11	1,758,525	$	232,955	$	(47,872	)
Widewaters Parkway	August 2015	1	8	514,241
5062 Brittonfield Parkway	August 2015	1	1	40,162
Woodcliff Drive	August 2015	1	6	516,760
Interstate Place	August 2015	1	2	61,399
1000 Pittsford - Victor Road	August 2015	1	1	73,358
1200 Pittsford - Victor Road	August 2015	1	1	18,900
Corporate Crossing	August 2015	1	5	216,126
Canal View Boulevard	August 2015	1	3	118,375
14 Classic Street	August 2015	1	1	37,084
110 W Fayette Street	August 2015	1	1	304,906
251 Salina Meadows Parkway	August 2015	1	1	65,617
Upstate New York portfolio(3)		11	30	1,966,928	$	104,625	$	(12,518	)
9040 Roswell Road	October 2015	1	1	178,941
The Exchange	October 2015	1	2	187,632
3920 Arkwright Road	October 2015	1	1	196,156
1775 West Oak Commons Court	October 2015	1	1	79,854
Georgia portfolio(3)		4	5	642,583	$	48,550	$	(3,059	)
		91	135	18,939,185	$	1,999,413	$	84,421

(1) This property contains three buildings. We sold one building in March 2015 and two buildings in May 2015.

(2) Title to this property was transferred to the lender pursuant to a consensual foreclosure in full satisfaction of the mortgage debt with a principal balance of $40.1 million, resulting in a gain on early extinguishment of debt of $17.3 million for the year ended December 31, 2015. See Note 9 for additional information.

(3) Prior to the disposition of these properties, we recorded a total impairment charge of $17.2 million during the year ended December 31, 2015, based upon updated market information in accordance with our impairment analysis procedures.

(4) These properties were sold in a separate transaction to a different buyer than other Australian properties.

(5) The loss on sale includes a $63.2 million cumulative foreign currency translation adjustment reclassified from cumulative other comprehensive loss due to the disposition of the Australian portfolio.

During the years ended December 31, 2014 and 2013, we sold the following properties (dollars in thousands):

Date Sold	Number of Properties	Number of Buildings	Square Footage	Sales Price		Gain (Loss) on Sale
Sales of properties resulting in gains and losses
December 2013	3	40	1,670,104	$	89,000	$	(25,521	)
June 2013(6)	—	—	—	2,551		1,765
June 2013	1	1	30,105	1,600		317
March 2013(6)	—	—	—	1,806		1,596
January 2013(7)	3	18	1,060,026	10,250		1,277
	7	59	2,760,235	$	105,207	$	(20,566	)
Sales of properties with previously recorded asset impairment losses:
June 2014(8)	14	43	2,784,098	$	215,900
December 2013	2	2	77,394	$	2,020
November 2013	18	21	2,125,278	50,500
October 2013	1	2	199,418	4,000
October 2013	1	1	665,545	13,900
October 2013	9	41	1,211,536	43,000
August 2013	1	3	129,452	4,100
June 2013	1	1	143,802	5,250
June 2013	1	2	356,045	16,300
May 2013	1	1	57,250	4,025
April 2013	1	1	618,000	830
	36	75	5,583,720	$	143,925

(6) We sold a land parcel.

(7) We provided mortgage financing to the buyer, an unrelated third party, totaling $7.7 million at 6.0% per annum (Note 8).

(8) In connection with this transaction, we recognized a loss on asset impairment of $2.2 million and a loss on early extinguishment of debt of $3.3 million for the year ended December 31, 2014.  The sales price excludes mortgage debt repayments. These properties are included in income from discontinued operations for all years presented.

Schedule of Future Minimum Lease Payments

The future minimum lease payments, excluding tenant reimbursement revenue, scheduled to be received by us during the current terms of our leases as of December 31, 2015 are as follows (in thousands):

2016	$	400,987
2017	380,501
2018	353,286
2019	313,563
2020	275,406
Thereafter	1,175,661
	$	2,899,404

Schedule of Future Minimum Lease Payment Receivables

The future minimum lease payments scheduled to be paid by us during the current terms of this ground lease under which we are the lessee, as of December 31, 2015, are as follows (in thousands):

2016	$	1,477
2017	1,477
2018	1,483
2019	1,503
2020	1,503
Thereafter	128,491
	$	135,934

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Lease Intangibles (Tables)

12 Months Ended

Dec. 31, 2015

Leases [Abstract]

Summary of the Carrying Amounts for Acquired Real Estate Leases and Assumed Real Estate Lease Obligations

The following table summarizes the carrying amounts for our acquired real estate leases and assumed real estate lease obligations as of December 31, 2015, and 2014, and (in thousands):

	December 31,
	2015			2014
Acquired in-place leases	$	147,056		$	272,077
Acquired above market leases	78,210			121,969
Acquired real estate leases	225,266			394,046
Accumulated amortization, acquired in-place leases	(91,301		)	(136,089		)
Accumulated amortization, acquired above market leases	(45,205		)	(59,670		)
Acquired real estate leases, net	$	88,760		$	198,287
Acquired below market leases	19,742			56,541
Accumulated amortization	(15,446		)	(29,757		)
Assumed real estate lease obligations, net	$	4,296		$	26,784

Schedule of Amortization of Lease Intangibles

Amortization of the lease intangibles for the years ended December 31, 2015, 2014, and 2013, is as follows (in thousands):

		December 31,
	Income Statement Location	2015			2014			2013
Amortization of acquired in-place leases	Depreciation and amortization	$	26,787		$	40,493		$	48,023
Amortization of acquired in-place leases	Discontinued operations	—			—			1,720
Amortization of above and below market leases	Increase (decrease) to rental income	(7,515		)	(10,650		)	(10,310		)
Amortization of above and below market leases	Discontinued operations	—			—			775

Schedule of Future Amortization of Net Intangible Lease Assets and Liabilities

Future amortization of net intangible lease assets and liabilities to be recognized by us during the current terms of our leases as of December 31, 2015, are approximately (in thousands):

2016	$	18,054
2017	15,213
2018	12,619
2019	8,778
2020	7,535
Thereafter	22,265
	$	84,464

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Equity Investments (Tables)

12 Months Ended

Dec. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Equity Investments

At December 31, 2015, and 2014, we did not have any ownership interests in equity investments. For the years ended December 31, 2014, and 2013, equity in earnings is as follows (in thousands):

	Year Ended December 31,
	2014			2013
SIR	$	24,516		$	21,153
GOV	—			4,111
AIC	(56		)	490
	$	24,460		$	25,754

Summary of Unaudited Income Statement Information of Equity Method Investee

The following unaudited summarized income statement information of SIR for the period from January 1, 2014, through July 9, 2014, and for the year ended December 31, 2013, is as follows (in thousands, except per share data):

	For the Period from January 1, 2014 through July 9, 2014			Year Ended December 31, 2013
Rental income	98,226			$	159,011
Tenant reimbursements and other income	16,980			29,312
Total revenues	115,206			188,323
Operating expenses	20,982			36,382
Depreciation and amortization	20,832			31,091
Acquisition related costs	374			2,002
General and administrative	7,731			12,423
Total expenses	49,919			81,898
Operating income	65,287			106,425
Interest expense	(7,287		)	(13,763		)
Gain on early extinguishment of debt	243			—
Income before income tax expense and equity in earnings of an investee	58,243			92,662
Income tax expense	(90		)	96
Equity in earnings of an investee	32			334
Net income	$	58,185		$	93,092
Weighted average common shares outstanding	52,394			44,565
Net income per common share	$	1.11		$	2.09

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Other Assets (Tables)

12 Months Ended

Dec. 31, 2015

Other Assets [Abstract]

Summary of Deferred Financing Fees, Deferred Leasing Costs and Capitalized Lease Incentives

The following table summarizes our deferred financing fees, deferred leasing costs and capitalized lease incentives as of December 31, 2015, and 2014 (in thousands):

	December 31,
	2015			2014
Deferred financing fees	$	43,346		$	41,339
Accumulated amortization	(25,158		)	(24,478		)
Deferred financing fees, net	$	18,188		$	16,861
Deferred leasing costs	$	166,390		$	184,600
Accumulated amortization	(56,162		)	(58,348		)
Deferred leasing costs, net	$	110,228		$	126,252
Capitalized lease incentives	$	11,623		$	22,650
Accumulated amortization	(2,498		)	(7,459		)
Capitalized lease incentives, net	$	9,125		$	15,191

Summary of Future Amortization of Deferred Leasing Costs and Capitalized Lease Incentives

Future amortization of deferred leasing costs and capitalized lease incentives to be recognized by us during the current terms of our leases as of December 31, 2015 are approximately (in thousands):

	Deferred Leasing Costs		Capitalized Lease Incentives
2016	$	15,933	$	1,528
2017	14,870		1,477
2018	13,369		779
2019	12,246		704
2020	10,324		608
Thereafter	43,486		4,029
	$	110,228	$	9,125

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Indebtedness (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Outstanding Indebtedness

At December 31, 2015 and 2014, our outstanding indebtedness included the following (in thousands):

					December 31,
	Interest Rate at December 31, 2015			Maturity Date	2015			2014
Unsecured revolving credit facility, at LIBOR plus a premium	1.68	%		1/28/2019	$	—		$	—
5-year unsecured term loan, at LIBOR plus a premium	1.83	%		1/28/2020	200,000			—
7-year unsecured term loan, at LIBOR plus a premium	2.23	%		1/28/2022	200,000			—
Unsecured term loan, at LIBOR plus a premium	—	%		—	—			400,000
Unsecured floating rate debt	2.03	%	(1)		$	400,000		$	400,000
5.75% Senior Unsecured Notes due 2015	—	%		—	$	—		$	138,773
6.25% Senior Unsecured Notes due 2016	6.25	%		8/15/2016	139,104			139,104
6.25% Senior Unsecured Notes due 2017	6.25	%		6/15/2017	250,000			250,000
6.65% Senior Unsecured Notes due 2018	6.65	%		1/15/2018	250,000			250,000
5.875% Senior Unsecured Notes due 2020	5.88	%		9/15/2020	250,000			250,000
5.75% Senior Unsecured Notes due 2042	5.75	%		8/1/2042	175,000			175,000
Unsecured fixed rate debt	6.17	%	(1)		$	1,064,104		$	1,202,877
111 Monument Circle	—	%		—	$	—		$	116,000
225 Water Street	—	%		—	—			40,059
111 East Wacker Drive	—	%		—	—			142,666
2501 20th Place South	—	%		—	—			10,267
Parkshore Plaza	5.67	%		5/1/2017	41,275			41,275
1735 Market Street(2)	5.66	%		12/2/2019	169,612			171,498
206 East 9th Street	5.69	%		1/5/2021	27,515			27,965
1320 Main Street	—	%		—	—			38,979
33 Stiles Lane	6.75	%		3/1/2022	2,785			3,132
97 Newberry Road	5.71	%		3/1/2026	6,375			6,819
Secured fixed rate debt	5.68	%	(1)		$	247,562		$	598,660
					$	1,711,666		$	2,201,537
Unamortized net premiums and discounts					(1,342		)	6,128
					$	1,710,324		$	2,207,665

(1) Represents weighted average interest rate at December 31, 2015.

(2) Interest on this loan is payable at LIBOR plus 2.625% but has been fixed for the first seven years to December 1, 2016 by a cash flow hedge which sets the rate at approximately 5.66%.

Schedule of Required Principal Payments on Outstanding Debt

The required principal payments due during the next five years and thereafter under all of our outstanding debt at December 31, 2015 are as follows (in thousands):

2016	$	142,450
2017	294,865
2018	253,847
2019	164,613
2020	451,674
Thereafter	404,217
	$	1,711,666

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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Schedule of Declared Distributions

The following characterizes distributions paid per common share for the years ended December 31, 2015, 2014, and 2013:

	Year Ended December 31,
	2015		2014		2013
Ordinary income	—	%	—	%	—	%
Return of capital	—	%	—	%	100.00	%
Capital gain	—	%	100.00	%	—	%
Unrecaptured Section 1250 gain	—	%	—	%	—	%
	—	%	100.00	%	100.00	%

In 2015, our Board of Trustees declared distributions on our series D preferred shares and series E cumulative redeemable preferred shares to date as follows:

Declaration Date	Record Date	Payment Date	Series D Dividend Per Share		Series E Dividend Per Share
January 16, 2015	February 2, 2015	February 17, 2015	$	0.40625	$	0.453125
April 8, 2015	May 1, 2015	May 15, 2015	$	0.40625	$	0.453125
July 9, 2015	July 31, 2015	August 17, 2015	$	0.40625	$	0.453125
October 9, 2015	November 2, 2015	November 16, 2015	$	0.40625	$	0.453125

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Cumulative Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2015

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Amounts Recognized in Cumulative Other Comprehensive Loss

The following tables present the amounts recognized in cumulative other comprehensive loss by component for the year ended December 31, 2015 (in thousands):

	Year Ended December 31, 2015
	Unrealized Loss on Derivative Instruments and Other Assets			Foreign Currency Translation Adjustments			Total
Balances as of January 1, 2015	$	(4,299	)	$	(48,917	)	$	(53,216	)
Other comprehensive loss before reclassifications	(1,232		)	(14,290		)	(15,522		)
Amounts reclassified from cumulative other comprehensive loss to net income	1,844			63,207			65,051
Net current period other comprehensive income	612			48,917			49,529
Balances as of December 31, 2015	$	(3,687	)	$	—		$	(3,687	)

Schedule of Reclassifications Out of Cumulative Other Comprehensive Loss

The following tables present reclassifications out of cumulative other comprehensive loss for the year ended December 31, 2015 (in thousands):

	Year Ended December 31, 2015
Details about Cumulative Other Comprehensive Loss Components	Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income			Affected Line Items in the Statement of Operations
Interest rate swap contracts	$	4,924		Interest expense
Foreign currency translation adjustment activity	63,207			Gain on sale of properties
Realized gain on available for sale securities	(3,080		)	Interest and other income
	$	65,051

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Provision for Income Taxes

Our provision for income taxes consists of the following (in thousands):

	Year Ended December 31,
	2015			2014		2013
Current:
State	$	270		$	350	$	519
Federal	513			—		—
Foreign	2,336			2,772		2,572
	3,119			3,122		3,091
Deferred:
Foreign	(755		)	69		(457		)
	(755		)	69		(457		)
Income tax expense	$	2,364		$	3,191	$	2,634

Schedule of Reconciliation of Effective Tax Rate and the U.S. Federal Statutory Income Tax Rate

A reconciliation of our effective tax rate and the U.S. Federal statutory income tax rate is as follows:

	Year Ended December 31,
	2015		2014		2013
Taxes at statutory U.S. federal income tax rate	35.00	%	35.00	%	35.00	%
Dividends paid deduction and net operating loss utilization	(35.00	)%	(35.00	)%	(35.00	)%
Federal taxes on built-in gain	0.50	%	—	%	—	%
State, local, and foreign income taxes	1.81	%	11.73	%	(1.71	)%
Effective tax rate	2.31	%	11.73	%	(1.71	)%

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Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk

As of December 31, 2015, we had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk:

Interest Rate Derivative	Number of Instruments	Notional Amount (in thousands)
Interest rate swap	2	$169,612

Schedule of Fair Value of Derivative Financial Instruments

The table below presents the fair value of our derivative financial instruments as well as their classification on the consolidated balance sheets as of December 31, 2015, and 2014 (amounts in thousands):

		Fair Value as of December 31,
Interest Rate Derivative Designated as Hedging Instrument	Balance Sheet Location	2015		2014
Pay-fixed swaps	Accounts payable and accrued expenses	$	3,687	$	7,462

Schedule of Gain or Loss Recognized on Interest Rate Derivatives Designated as Cash Flow Hedges

The table below details the location in the financial statements of the gain or loss recognized on interest rate derivatives designated as cash flow hedges for the years ended December 31, 2015, 2014, and 2013 (amounts in thousands):

	Year Ended December 31,
	2015			2014			2013
Balance at beginning of period	$	(7,462	)	$	(11,706	)	$	(16,624	)
Amount of loss recognized in cumulative other comprehensive loss	(1,149		)	(776		)	(103		)
Amount of loss reclassified from cumulative other comprehensive loss into interest expense	4,924			5,020			5,021
Unrealized gain on derivative instruments	3,775			4,244			4,918
Balance at end of period	$	(3,687	)	$	(7,462	)	$	(11,706	)

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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Restricted Share and Restricted Stock Unit Activity

The table below presents a summary of restricted share and RSU activity under the 2015 Incentive Plan and the 2012 Plan for the years ended December 31, 2015, and 2014, excluding restricted shares granted to our former Trustees, former officers and certain employees of RMR under the terms of our 2012 Plan (which grants are further described below):

	Number of Restricted Shares		Weighted Average Grant Date Fair Value		Number of RSUs		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013	—		$	—	—		$	—
Granted	713,727		26.66		1,266,237		15.99
Vested	(3,545	)	26.66		—		—
Outstanding at December 31, 2014	710,182				1,266,237
Granted	160,906		26.46		639,250		15.47
Vested	(86,517	)	26.02		—		—
Forfeited	(8,115	)	26.64		(21,377	)	15.80
Outstanding at December 31, 2015	776,456				1,884,110

Summary of Assumptions and Fair Values for Restricted Stock Units Granted in the Period

The assumptions and fair values for the RSUs granted for the years ended December 31, 2015, and 2014 are included in the following table on a per share basis.

	2015			2014
Fair value of RSUs granted	$	15.47		$	15.99
Expected term (years)	4			4
Expected volatility	—			—
Expected dividend yield	1.88		%	1.88		%
Risk-free rate	0.81		%	0.84		%

Schedule of Shares Granted and Vested

A summary of shares granted and vested to our former Trustees, former officers and certain employees of RMR under the terms of our 2012 Plan and our 2003 Plan for the years ended December 31, 2014, and 2013, is as follows:

	Number of Shares		Weighted Average Grant Date Fair Value
Unvested shares at December 31, 2012	114,703		19.39
Granted	83,450		23.29
Vested	(66,639	)	23.06
Forfeited	(600	)	22.49
Unvested shares at December 31, 2013	130,914		20.70
Granted	4,000		23.46
Vested	(134,914	)	25.79
Unvested shares at December 31, 2014	—		—

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Fair Value of Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value

The table below presents certain of our assets and liabilities measured at fair value during 2015 and 2014, categorized by the level of inputs used in the valuation of each asset and liability (dollars in thousands):

				Fair Value at December 31, 2015 Using
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
Description	Total			(Level 1)		(Level 2)			(Level 3)
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$	(3,687	)	$	—	$	(3,687	)	$	—
Derivative liability	(7,219		)	—		—			(7,219		)

				Fair Value at December 31, 2014 Using
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
Description	Total			(Level 1)		(Level 2)			(Level 3)
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$	(7,462	)	$	—	$	(7,462	)	$	—
Derivative liability	(6,658		)	—		—			(6,658		)

Schedule of Valuation Techniques and Significant Unobservable Inputs used for Level 3 Fair Value Measurements

The valuation techniques and significant unobservable inputs used for our level 3 fair value measurement at December 31, 2015, and 2014 were as follows:

Description	Fair Value at December 31, 2015		Primary Valuation  Technique	Unobservable Inputs	Rate
Derivative liability	$	7,219	Monte Carlo simulation	Risk-free rate	0.52%
				Volatility	20.0%

Description	Fair Value at December 31, 2014		Primary Valuation  Technique	Unobservable Inputs	Rate
Derivative liability	$	6,658	Monte Carlo simulation	Risk-free rate	0.50%
				Volatility	20.0%

The valuation techniques and significant unobservable inputs used for our level 3 fair value measurements at June 30, 2014 were as follows:

Description	Fair Value at June 30, 2014		Primary Valuation Techniques	Unobservable Inputs	Rate
225 Water Street	$	19,589	Discounted cash flows	Discount rate	8%
				Exit capitalization rate	8%

The valuation techniques and significant unobservable inputs used for our level 3 fair value measurements at December 31, 2014 were as follows:

Description	Fair Value at December 31, 2014		Primary Valuation Techniques	Unobservable Inputs	Weighted Average(1)
Properties held and used on which we recognized impairment losses	$	414,625	Discounted cash flows	Discount rate	10.2%
				Exit capitalization rate	9.1%

(1) Calculated as a weighted average based on the fair value at December 31, 2014.

Schedule of Fair Value and Carrying Value of Financial Instruments

At December 31, 2015 and 2014, the fair value of these additional financial instruments were not materially different from their carrying values, except as follows (in thousands):

	December 31, 2015				December 31, 2014
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Senior unsecured debt and mortgage notes payable, net	$	1,710,324	$	1,749,211	$	2,207,665	$	2,263,535

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Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (amounts in thousands except per share amounts):

	Year Ended December 31,
	2015			2014			2013
Numerator for earnings per common share - basic and diluted:
Income (loss) from continuing operations	$	99,857		$	21,206		$	(37,318	)
Net income attributable to noncontrolling interest in consolidated subsidiary	—			—			(20,093		)
Preferred distributions	(27,924		)	(32,095		)	(44,604		)
Excess fair value of consideration over carrying vale of preferred shares	—			(16,205		)	—
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders	71,933			(27,094		)	(102,015		)
Discontinued operations	—			2,806			(119,649		)
Numerator for net income (loss) per share - basic and diluted	$	71,933		$	(24,288	)	$	(221,664	)
Denominator for earnings per common share - basic and diluted:
Weighted average number of common shares outstanding - basic	128,621			125,163			112,378
Weighted average number of common shares outstanding - diluted(1)	129,437			125,163			112,378
Earnings per share - basic:
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders	$	0.56		$	(0.21	)	$	(0.91	)
Discontinued operations	—			0.02			(1.06		)
Net income (loss) per share - basic	$	0.56		$	(0.19	)	$	(1.97	)
Earnings per share - diluted:
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders	$	0.56		$	(0.21	)	$	(0.91	)
Discontinued operations	—			0.02			(1.06		)
Net income (loss) per share - diluted	$	0.56		$	(0.19	)	$	(1.97	)
Anti-dilutive securities:
Effect of Series D preferred shares; 6 1/2% cumulative convertible(2)	2,363			4,175			7,298

(1) As of December 31, 2015, we had granted RSUs to certain employees, officers, and the chairman of the Board of Trustees.  The RSUs contain both service and market-based vesting components.  None of the RSUs have vested.  If the market-based vesting component was measured as of December 31, 2015, 1,143 common shares would be issued to the RSU holders, and no shares would have been issued for the other periods presented.  Using a weighted average basis, 816 common shares are reflected in diluted earnings per share for the year ended ended December 31, 2015.

(2) The Series D preferred shares are excluded from the diluted earnings per share calculation because including the Series D preferred shares would also require that the preferred distributions be added back to net income, resulting in anti-dilution during the periods presented.

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Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Summary of Unaudited Quarterly Results of Operations

The following is a summary of our unaudited quarterly results of operations for 2015 and 2014 (dollars in thousands):

	2015
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Total revenues	$	213,055	$	203,694	$	159,208	$	138,934
Net income attributable to Equity Commonwealth common shareholders	6,649		5,635		23,485		36,164
Net income attributable to Equity Commonwealth common shareholders per share—basic	0.05		0.04		0.18		0.29
Net income attributable to Equity Commonwealth common shareholders per share—diluted	0.05		0.04		0.18		0.28

The decrease in the third and fourth quarter 2015 total revenues and net income attributable to Equity Commonwealth common shareholders was primarily attributable to properties sold in the second, third and fourth quarters of 2015.

	2014
	First Quarter		Second Quarter			Third Quarter		Fourth Quarter
Total revenues	$	217,260	$	215,194		$	216,595	$	212,808
Net income (loss) attributable to Equity Commonwealth common shareholders	9,297		(17,802		)	149,759		(165,542		)
Net income (loss) attributable to Equity Commonwealth common shareholders per share—basic	0.08		(0.14		)	1.16		(1.28		)
Net income (loss) attributable to Equity Commonwealth common shareholders per share—diluted	0.08		(0.14		)	1.16		(1.28		)
Common distributions declared	0.25		—			—		—

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Organization - Schedule of Portfolio (Details)	Dec. 31, 2015 ft² building property	Dec. 31, 2014 ft² property	Mar. 31, 2014 ft²
Segment Reporting Information [Line Items]
Number of Properties | property		31
Square Footage | ft²		5,600,000	5,641,450
Consolidated portfolio
Segment Reporting Information [Line Items]
Number of Properties | property	65
Number of Buildings | building	127
Square Footage | ft²	23,952,000

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Organization - Narrative (Details) - shares					1 Months Ended	3 Months Ended
	Jul. 09, 2014	Jul. 02, 2013	Mar. 12, 2012	Feb. 29, 2012	Mar. 31, 2012	Jun. 30, 2014	Jul. 03, 2013	Jul. 01, 2013	Mar. 15, 2013
SIR
Organization
Equity investments, number of shares sold (in shares)	22,000,000
Issuance of shares, net (in shares)		10,500,000				10,000,000
Ownership percentage							44.20%
Ownership Percentage	0.00%	56.00%				36.70%
Equity investments, common shares owned (in shares)		22,000,000					22,000,000
GOV
Organization
Ownership Percentage									18.20%
Equity investments, common shares owned (in shares)									9,950,000
SIR
Organization
Less than wholly owned subsidiary, common shares owned (in shares)	22,000,000					22,000,000		22,000,000
Equity investments, number of shares sold (in shares)	22,000,000
Ownership percentage prior to initial public offering			100.00%	100.00%
Issuance of shares, net (in shares)		10,500,000	9,200,000		9,200,000
Ownership Percentage	0.00%	44.20%				36.70%
SIR | Previously reported
Organization
Ownership percentage								56.00%

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Summary of Significant Accounting Policies - Narrative (Details)	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) property
Property, Plant and Equipment [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax				$ 8,857,000	$ 0	$ 0
Percentage of investments in subsidiaries				100.00%
Loss on asset impairment		$ 167,100,000	$ 22,700,000	$ 17,162,000	185,067,000	124,253,000
Loss on asset impairment in discontinuing operations						$ 79,800,000
Number of properties impaired | property						39
Number of buildings impaired | property						93
Losses on asset impairment for properties sold						$ 23,100,000
Accrued environmental remediation costs		500,000			$ 500,000
Minimum percentage of likelihood of realization of tax benefits					50.00%
Foreign currency translation adjustments		$ (48,900,000)		0	$ (48,900,000)
Total amounts reclassified				$ (65,051,000)
Maximum
Property, Plant and Equipment [Line Items]
Maximum percentage of investment accounted for under equity method of accounting				50.00%
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Maximum estimated useful life				40 years
Maximum | Personal property
Property, Plant and Equipment [Line Items]
Maximum estimated useful life				12 years
Foreign Currency Translation Adjustments
Property, Plant and Equipment [Line Items]
Total amounts reclassified				$ (63,207,000)
Foreign Currency Translation Adjustments | Australia Portfolio
Property, Plant and Equipment [Line Items]
Total amounts reclassified	$ 63,200,000

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Board of Trustees - Narrative (Details) - trustee	Jun. 16, 2015	Jul. 31, 2014	May. 23, 2014	Feb. 18, 2014
Board of Trustees
Number of trustees elected		7	7
Total number of trustees	11	11
Minimum holders of outstanding common shares consented to the proposal, reaching the required threshold (as a percent)				66.67%

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Real Estate Properties - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2014 USD ($) ft² building property	Dec. 31, 2014 USD ($) ft² property	Jun. 30, 2014 USD ($)	Dec. 31, 2015 USD ($) ft² property	Dec. 31, 2014 USD ($) ft² property	Dec. 31, 2013 USD ($)
Real Estate Properties [Line Items]
Loss on asset impairment		$ 167,100	$ 22,700	$ 17,162	$ 185,067	$ 124,253
Real estate property improvements				75,700	$ 91,600	122,900
Committed expenditures on leases executed during period				$ 156,400
Square feet of leases committed for expenditures during the period | ft²				4,900,000
Committed but unspent tenant related obligations based on existing leases				$ 118,900
Number of real estate properties held for use | property	31
Number of buildings held for use | building	67
Property square feet | ft²	5,641,450	5,600,000			5,600,000
Reversal of previously recorded impairment losses	$ 4,800
Number of real estate properties held for sale | property		0		0	0
Ground lease expenses				$ 1,800	$ 1,800	$ 1,900
Disposed of by Sale
Real Estate Properties [Line Items]
Property square feet | ft²				18,939,185

XML

Real Estate Properties - Summary of Properties Held for Sale (Details)	Dec. 31, 2015 property	Dec. 31, 2014 ft² property	Mar. 31, 2014 ft²
Real Estate [Abstract]
Number of Real Estate Properties Held for Sale | property	0	0
Square Footage | ft²		5,600,000	5,641,450

XML

Real Estate Properties - Summary of Properties Disposed (Details) $ in Thousands	1 Months Ended										3 Months Ended		12 Months Ended
	Dec. 31, 2015 USD ($) ft² building property	Oct. 31, 2015 USD ($) ft² building property	Sep. 30, 2015 USD ($) ft² building property	Aug. 31, 2015 USD ($) ft² building property	Jun. 30, 2015 USD ($) ft² building property	May. 31, 2015 USD ($) ft² building property	Apr. 30, 2015 USD ($) ft² building property	Mar. 31, 2015 USD ($) ft² building property	Jan. 31, 2015 USD ($) ft² building property	Jan. 31, 2013 building	Jun. 30, 2015 USD ($) ft² building property	May. 31, 2015 ft² building	Dec. 31, 2015 USD ($) ft² building property	Dec. 31, 2014 USD ($) ft²	Dec. 31, 2013 USD ($)	Mar. 31, 2014 ft²
Real Estate Properties [Line Items]
Number of Buildings										18
Square Footage | ft²														5,600,000		5,641,450
Gain (Loss) on Sale | $													$ 84,421	$ 0	$ 1,596
333 Laurel Oak Drive
Real Estate Properties [Line Items]
Number of Buildings												3
Disposed of by Sale
Real Estate Properties [Line Items]
Number of Properties | property													91
Number of Buildings													135
Square Footage | ft²	18,939,185												18,939,185
Gross Sales Price | $													$ 1,999,413
Gain (Loss) on Sale | $													$ 84,421
Disposed of by Sale | 11350 North Meridian Street
Real Estate Properties [Line Items]
Number of Properties | property									1
Number of Buildings									1
Square Footage | ft²									72,264
Gross Sales Price | $									$ 4,200
Gain (Loss) on Sale | $									$ 766
Disposed of by Sale | 333 Laurel Oak Drive
Real Estate Properties [Line Items]
Number of Properties | property								0
Number of Buildings						2		1
Square Footage | ft²								27,164
Gross Sales Price | $								$ 2,450
Gain (Loss) on Sale | $								$ 251
Disposed of by Sale | 1921 E. Alton Avenue
Real Estate Properties [Line Items]
Number of Properties | property								1
Number of Buildings								1
Square Footage | ft²								67,846
Gross Sales Price | $								$ 14,533
Gain (Loss) on Sale | $								$ 4,851
Disposed of by Sale | 46 Inverness Center Parkway
Real Estate Properties [Line Items]
Number of Properties | property							0
Number of Buildings							0
Square Footage | ft²							0
Gross Sales Price | $							$ 2,000
Gain (Loss) on Sale | $							$ 1,857
Disposed of by Sale | Sorrento Valley Business Park
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					4
Square Footage | ft²					105,003						105,003
Gross Sales Price | $					$ 23,500
Gain (Loss) on Sale | $					$ 11,896
Disposed of by Sale | Illinois Center
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				2
Square Footage | ft²				2,090,162
Gross Sales Price | $				$ 376,000
Gain (Loss) on Sale | $				$ 26,956
Disposed of by Sale | 16th and Race Street
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				1
Square Footage | ft²				608,625
Gross Sales Price | $				$ 43,000
Gain (Loss) on Sale | $				$ 7,922
Disposed of by Sale | 185 Asylum Street
Real Estate Properties [Line Items]
Number of Properties | property			1
Number of Buildings			1
Square Footage | ft²			868,395
Gross Sales Price | $			$ 113,250
Gain (Loss) on Sale | $			$ 17,619
Disposed of by Sale | One South Church Avenue
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings		1
Square Footage | ft²		240,811
Gross Sales Price | $		$ 32,000
Gain (Loss) on Sale | $		$ 4,282
Disposed of by Sale | 775 Ridge Lake Boulevard
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings		1
Square Footage | ft²		120,678
Gross Sales Price | $		$ 16,300
Gain (Loss) on Sale | $		$ (360)
Disposed of by Sale | One Park Square
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings		6
Square Footage | ft²		259,737
Gross Sales Price | $		$ 34,300
Gain (Loss) on Sale | $		$ 9,512
Disposed of by Sale | Arizona Center
Real Estate Properties [Line Items]
Number of Properties | property	1
Number of Buildings	4
Square Footage | ft²	1,070,724												1,070,724
Gross Sales Price | $	$ 126,000
Gain (Loss) on Sale | $	$ 22,838
Disposed of by Sale | 4 South 84th Avenue
Real Estate Properties [Line Items]
Number of Properties | property	1
Number of Buildings	1
Square Footage | ft²	236,007												236,007
Gross Sales Price | $	$ 18,000
Gain (Loss) on Sale | $	$ 8,393
Disposed of by Sale | 7450 Campus Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						77,411						77,411
Disposed of by Sale | 129 Worthington Ridge Road
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						227,500						227,500
Disposed of by Sale | 599 Research Parkway
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						48,249						48,249
Disposed of by Sale | 181 Marsh Hill Road
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						162,036						162,036
Disposed of by Sale | 101 Barnes Road
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						45,755						45,755
Disposed of by Sale | 15 Sterling Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						173,015						173,015
Disposed of by Sale | 35 Thorpe Avenue
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						79,862						79,862
Disposed of by Sale | 50 Barnes Industrial Road North
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						154,255						154,255
Disposed of by Sale | 5-9 Barnes Industrial Road
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						38,006						38,006
Disposed of by Sale | 860 North Main Street
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						31,165						31,165
Disposed of by Sale | One Barnes Industrial Road South
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						30,170						30,170
Disposed of by Sale | Village Lane
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						2
Square Footage | ft²						58,185						58,185
Disposed of by Sale | 100 Northfield Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						116,986						116,986
Disposed of by Sale | 905 Meridian Lake Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						74,652						74,652
Disposed of by Sale | 1717 Deerfield Road
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						141,186						141,186
Disposed of by Sale | 1955 West Field Court
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						59,130						59,130
Disposed of by Sale | 5015 S. Water Circle
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						113,524						113,524
Disposed of by Sale | Adams Place
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						2
Square Footage | ft²						230,259						230,259
Disposed of by Sale | Cabot Business Park
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						2
Square Footage | ft²						252,755						252,755
Disposed of by Sale | 2300 Crown Colony Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						45,974						45,974
Disposed of by Sale | Myles Standish Industrial Park
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						2
Square Footage | ft²						74,800						74,800
Disposed of by Sale | 340 Thompson Road
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						25,000						25,000
Disposed of by Sale | 100 South Charles Street
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						159,616						159,616
Disposed of by Sale | 6710 Oxon Hill
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						118,336						118,336
Disposed of by Sale | 8800 Queen Avenue South
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						280,822						280,822
Disposed of by Sale | 9800 Sherlard Parkway
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						46,765						46,765
Disposed of by Sale | Rosedale Corporate Plaza
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						3
Square Footage | ft²						149,116						149,116
Disposed of by Sale | 1000 Shelard Parkway
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						62,499						62,499
Disposed of by Sale | 525 Park Street
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						75,636						75,636
Disposed of by Sale | 1900 Meyer Drury Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						65,225						65,225
Disposed of by Sale | 131-165 West Ninth Street
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						75,517						75,517
Disposed of by Sale | 7-9 Vreeland Road
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						155,891						155,891
Disposed of by Sale | 5 Paragon Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						119,089						119,089
Disposed of by Sale | 1000 Voorhees Drive and 400 Laurel Oak Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						2
Square Footage | ft²						125,415						125,415
Disposed of by Sale | 1601 Veterans Highway
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						63,608						63,608
Disposed of by Sale | Two Corporate Center Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						291,230						291,230
Disposed of by Sale | 11311 Cornell Center Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						93,413						93,413
Disposed of by Sale | 5300 Kings Island Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						159,421						159,421
Disposed of by Sale | 3 Crown Point Court
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						73,987						73,987
Disposed of by Sale | 515 Pennsylvania Avenue
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						82,000						82,000
Disposed of by Sale | 443 Gulph Road
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						21,000						21,000
Disposed of by Sale | 4350 Northern Pike
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						503,885						503,885
Disposed of by Sale | Thunderbolt Place
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						2
Square Footage | ft²						100,505						100,505
Disposed of by Sale | 6160 Kempsville Circle
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						129,565						129,565
Disposed of by Sale | 448 Viking Drive
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						75,374						75,374
Disposed of by Sale | Portfolio of Small Office and Industrial Assets
Real Estate Properties [Line Items]
Number of Properties | property						45
Number of Buildings						53
Square Footage | ft²						5,287,790						5,287,790
Gross Sales Price | $						$ 376,000
Gain (Loss) on Sale | $						$ (8,160)
Disposed of by Sale | 2501 20th Place South
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					125,722						125,722
Disposed of by Sale | 420 20th Street North
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					514,893						514,893
Disposed of by Sale | Inverness Center
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					4
Square Footage | ft²					475,882						475,882
Disposed of by Sale | 701 Poydras Street
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					1,256,971						1,256,971
Disposed of by Sale | 300 North Greene Street
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					324,305						324,305
Disposed of by Sale | 1320 Main Street
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					334,075						334,075
Disposed of by Sale | AL, LA, NC, SC Office Portfolio
Real Estate Properties [Line Items]
Number of Properties | property					6
Number of Buildings					9
Square Footage | ft²					3,031,848						3,031,848
Gross Sales Price | $					$ 417,450
Gain (Loss) on Sale | $					$ 41,596
Disposed of by Sale | 12655 Olive Boulevard
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					98,588						98,588
Disposed of by Sale | 1285 Fern Ridge Parkway
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					66,510						66,510
Disposed of by Sale | St. Louis Portfolio
Real Estate Properties [Line Items]
Number of Properties | property					2
Number of Buildings					2
Square Footage | ft²					165,098						165,098
Gross Sales Price | $					$ 14,300
Gain (Loss) on Sale | $					$ (2,349)
Disposed of by Sale | 310-314 Invermay Road
Real Estate Properties [Line Items]
Number of Properties | property							1
Number of Buildings							1
Square Footage | ft²							47,480
Disposed of by Sale | 253-293 George Town Road
Real Estate Properties [Line Items]
Number of Properties | property							1
Number of Buildings							1
Square Footage | ft²							143,914
Disposed of by Sale | 7 Modal Crescent
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					164,160						164,160
Disposed of by Sale | 71-93 Whiteside Road
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					303,488						303,488
Disposed of by Sale | 9-13 Titanium Court
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					69,664						69,664
Disposed of by Sale | 16 Rodborough Road
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					90,525						90,525
Disposed of by Sale | 22 Rodborough Road
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					43,427						43,427
Disposed of by Sale | 127-161 Cherry Lane
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					278,570						278,570
Disposed of by Sale | 310-320 Pitt Street
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					313,865						313,865
Disposed of by Sale | 44-46 Mandarin Street
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					226,718						226,718
Disposed of by Sale | 19 Leadership Way
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings					1
Square Footage | ft²					76,714						76,714
Disposed of by Sale | Australia Portfolio
Real Estate Properties [Line Items]
Number of Properties | property											11
Number of Buildings											11
Square Footage | ft²					1,758,525						1,758,525
Gross Sales Price | $											$ 232,955
Gain (Loss) on Sale | $											$ (47,872)
Disposed of by Sale | Widewaters Parkway
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				8
Square Footage | ft²				514,241
Disposed of by Sale | 5062 Brittonfield Parkway
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				1
Square Footage | ft²				40,162
Disposed of by Sale | Woodcliff Drive
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				6
Square Footage | ft²				516,760
Disposed of by Sale | Interstate Place
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				2
Square Footage | ft²				61,399
Disposed of by Sale | 1000 Pittsford - Victor Road
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				1
Square Footage | ft²				73,358
Disposed of by Sale | 1200 Pittsford - Victor Road
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				1
Square Footage | ft²				18,900
Disposed of by Sale | Corporate Crossing
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				5
Square Footage | ft²				216,126
Disposed of by Sale | Canal View Boulevard
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				3
Square Footage | ft²				118,375
Disposed of by Sale | 14 Classic Street
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				1
Square Footage | ft²				37,084
Disposed of by Sale | 110 W Fayette Street
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				1
Square Footage | ft²				304,906
Disposed of by Sale | 251 Salina Meadows Parkway
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings				1
Square Footage | ft²				65,617
Disposed of by Sale | Upstate New York Portfolio
Real Estate Properties [Line Items]
Number of Properties | property				11
Number of Buildings				30
Square Footage | ft²				1,966,928
Gross Sales Price | $				$ 104,625
Gain (Loss) on Sale | $				$ (12,518)
Disposed of by Sale | 9040 Roswell Road
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings		1
Square Footage | ft²		178,941
Disposed of by Sale | The Exchange
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings		2
Square Footage | ft²		187,632
Disposed of by Sale | 3920 Arkwright Road
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings		1
Square Footage | ft²		196,156
Disposed of by Sale | 1775 West Oak Commons Court
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings		1
Square Footage | ft²		79,854
Disposed of by Sale | Georgia Portfolio
Real Estate Properties [Line Items]
Number of Properties | property		4
Number of Buildings		5
Square Footage | ft²		642,583
Gross Sales Price | $		$ 48,550
Gain (Loss) on Sale | $		$ (3,059)
Foreclosure | 225 Water Street
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings						1
Square Footage | ft²						318,997						318,997
Gross Sales Price | $						$ 0
Gain (Loss) on Sale | $						$ 0

XML

Real Estate Properties - Summary of Properties Disposed (Footnote) (Details) $ in Thousands	1 Months Ended					3 Months Ended				12 Months Ended
	Jun. 30, 2015 USD ($)	May. 31, 2015 USD ($) building	Mar. 31, 2015 building	Mar. 31, 2013 USD ($)	Jan. 31, 2013 building	Jun. 30, 2015 building	May. 31, 2015 USD ($) building	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2015 USD ($) building	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Real Estate Properties [Line Items]
Number of buildings sold | building					18
Principal balance								$ 2,201,537		$ 1,711,666	$ 2,201,537
Gain (loss) on early extinguishment of debt				$ (60,000)						6,661	4,909	$ (60,052)
Loss on asset impairment								$ 167,100	$ 22,700	17,162	$ 185,067	$ 124,253
Amounts reclassified from cumulative other comprehensive loss to net income										(65,051)
Foreign Currency Translation Adjustments
Real Estate Properties [Line Items]
Amounts reclassified from cumulative other comprehensive loss to net income										$ (63,207)
Disposed of by Sale
Real Estate Properties [Line Items]
Number of buildings sold | building										135
333 Laurel Oak Drive
Real Estate Properties [Line Items]
Number of buildings sold | building							3
333 Laurel Oak Drive | Disposed of by Sale
Real Estate Properties [Line Items]
Number of buildings sold | building		2	1
225 Water Street | Mortgage notes
Real Estate Properties [Line Items]
Principal balance		$ 40,100					$ 40,100
Gain (loss) on early extinguishment of debt										$ 17,300
Australia Portfolio | Foreign Currency Translation Adjustments
Real Estate Properties [Line Items]
Amounts reclassified from cumulative other comprehensive loss to net income	$ 63,200
Australia Portfolio | Disposed of by Sale
Real Estate Properties [Line Items]
Number of buildings sold | building						11

XML

Real Estate Properties - Summary of Properties Sold (Details) $ in Thousands	1 Months Ended										12 Months Ended
	Jun. 30, 2014 USD ($) ft² property	Dec. 31, 2013 USD ($) ft² building property	Nov. 30, 2013 USD ($) ft² building property	Oct. 31, 2013 USD ($) ft² building property	Aug. 31, 2013 USD ($) ft² building property	Jun. 30, 2013 USD ($) ft² building property	May. 31, 2013 USD ($) ft² building property	Apr. 30, 2013 USD ($) ft² building property	Mar. 31, 2013 USD ($) ft² building property	Jan. 31, 2013 USD ($) ft² building property	Dec. 31, 2015 USD ($) ft² building	Dec. 31, 2014 USD ($) ft²	Dec. 31, 2013 USD ($) ft² building property	Mar. 31, 2014 ft²
Real Estate Properties [Line Items]
Number of Properties | property										3
Number of Buildings | building										18
Square Footage | ft²												5,600,000		5,641,450
Gain (Loss) on Sale											$ 84,421	$ 0	$ 1,596
Disposed of by Sale
Real Estate Properties [Line Items]
Number of Buildings | building											135
Square Footage | ft²											18,939,185
Sales Price											$ 1,999,413
Gain (Loss) on Sale											$ 84,421
Disposed of by Sale | Sales of properties resulting in gains and losses
Real Estate Properties [Line Items]
Number of Properties | property						1				3			7
Number of Buildings | building						1				18			59
Square Footage | ft²		2,760,235				30,105				1,060,026			2,760,235
Sales Price						$ 1,600				$ 10,250			$ 105,207
Gain (Loss) on Sale						$ 317				$ 1,277			$ (20,566)
Disposed of by Sale | Sales of properties with previously recorded asset impairment losses:
Real Estate Properties [Line Items]
Number of Properties | property	14		18	9	1	1	1	1					36
Number of Buildings	43		21	41	3	2	1	1					75
Square Footage | ft²	2,784,098	5,583,720	2,125,278	1,211,536	129,452	356,045	57,250	618,000					5,583,720
Sales Price	$ 215,900		$ 50,500	$ 43,000	$ 4,100	$ 16,300	$ 4,025	$ 830					$ 143,925
Gain (Loss) on Sale
Disposed of by Sale | Properties Sold in December | Sales of properties resulting in gains and losses
Real Estate Properties [Line Items]
Number of Properties | property		3
Number of Buildings | building		40
Square Footage | ft²		1,670,104											1,670,104
Sales Price		$ 89,000
Gain (Loss) on Sale		$ (25,521)
Disposed of by Sale | Properties Sold in December | Sales of properties with previously recorded asset impairment losses:
Real Estate Properties [Line Items]
Number of Properties | property		2
Number of Buildings | building		2
Square Footage | ft²		77,394											77,394
Sales Price		$ 2,020
Disposed of by Sale | Land parcel | Sales of properties resulting in gains and losses
Real Estate Properties [Line Items]
Number of Properties | property						0			0
Number of Buildings | building						0			0
Square Footage | ft²						0			0
Sales Price						$ 2,551			$ 1,806
Gain (Loss) on Sale						$ 1,765			$ 1,596
Disposed of by Sale | Properties Sold in October | Sales of properties with previously recorded asset impairment losses:
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings | building				2
Square Footage | ft²				199,418
Sales Price				$ 4,000
Disposed of by Sale | Other Properties | Sales of properties with previously recorded asset impairment losses:
Real Estate Properties [Line Items]
Number of Properties | property				1		1
Number of Buildings | building				1		1
Square Footage | ft²				665,545		143,802
Sales Price				$ 13,900		$ 5,250

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Real Estate Properties - Summary of Properties Sold (Footnote) (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2014	Jan. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate Properties [Line Items]
Mortgage financing related to property sold					$ 7,688
Loss on asset impairment from discontinued operations			$ 0	$ (2,238)	(102,869)
Loss on early extinguishment of debt from discontinued operations			$ 0	$ (3,345)	$ (1,011)
Disposed of by Sale | Sales of properties resulting in gains and losses
Real Estate Properties [Line Items]
Mortgage financing related to property sold		$ 7,700
Interest rate on real estate mortgage receivable		6.00%
Disposed of by Sale | Sales of properties with previously recorded asset impairment losses:
Real Estate Properties [Line Items]
Loss on asset impairment from discontinued operations	$ 2,200
Loss on early extinguishment of debt from discontinued operations	$ 3,300

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Real Estate Properties - Summary of Income Statement Information for Properties Included in Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statements of Operations:
Rental income									$ 570,382	$ 691,699	$ 763,262
Tenant reimbursements and other income									144,509	170,158	189,767
Total revenues	$ 138,934	$ 159,208	$ 203,694	$ 213,055	$ 212,808	$ 216,595	$ 215,194	$ 217,260	714,891	861,857	953,029
Operating expenses									324,948	387,982	410,045
Depreciation and amortization									194,001	227,532	234,402
General and administrative									57,457	113,155	80,504
Total expenses									593,568	913,741	849,522
Operating income (loss)									121,323	(51,884)	103,507
Interest and other income									5,989	1,561	1,229
Interest expense									(107,316)	(143,230)	(173,011)
Income from discontinued operations									$ 0	8,389	6,393
Discontinued operations, properties sold
Statements of Operations:
Rental income										14,243	55,073
Tenant reimbursements and other income										1,900	6,842
Total revenues										16,143	61,915
Operating expenses										7,138	37,027
Depreciation and amortization										0	12,550
General and administrative										10	4,268
Total expenses										7,148	53,845
Operating income (loss)										8,995	8,070
Interest and other income										2	65
Interest expense										(608)	(1,742)
Income from discontinued operations										$ 8,389	$ 6,393

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Real Estate Properties - Schedule of Future Minimum Lease Payment Receivables and Payments (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Future minimum lease payments receivable:
2016	$ 400,987
2017	380,501
2018	353,286
2019	313,563
2020	275,406
Thereafter	1,175,661
Total	2,899,404
Future minimum lease payments:
2016	1,477
2017	1,477
2018	1,483
2019	1,503
2020	1,503
Thereafter	128,491
Total	$ 135,934

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Lease Intangibles - Summary of the Carrying Amounts for Acquired Real Estate Leases and Assumed Real Estate Lease Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Acquired real estate leases	$ 225,266	$ 394,046
Acquired real estate leases, net	88,760	198,287
Assumed real estate lease obligations, net	4,296	26,784
Leases, Acquired-in-Place
Finite-Lived Intangible Assets [Line Items]
Acquired real estate leases	147,056	272,077
Accumulated amortization	(91,301)	(136,089)
Leases Acquired-in-Place, Above Market Lease
Finite-Lived Intangible Assets [Line Items]
Acquired real estate leases	78,210	121,969
Accumulated amortization	(45,205)	(59,670)
Leases Acquired-in-Place, Below Market Lease
Finite-Lived Intangible Assets [Line Items]
Acquired real estate leases	19,742	56,541
Accumulated amortization	$ (15,446)	$ (29,757)

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Lease Intangibles - Schedule of Amortization of Lease Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Leases [Abstract]
Amortization of acquired in-place leases, Depreciation and amortization	$ 26,787	$ 40,493	$ 48,023
Amortization of acquired in-place leases, Discontinued operations	0	0	1,720
Amortization of above and below market leases, Increase (decrease) to rental income	(7,515)	(10,650)	(10,310)
Amortization of above and below market leases, Discontinued operations	$ 0	$ 0	$ 775

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Lease Intangibles - Schedule of Future Amortization of Net Intangible Lease Assets and Liabilities (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Leases [Abstract]
2016	$ 18,054
2017	15,213
2018	12,619
2019	8,778
2020	7,535
Thereafter	22,265
Total	$ 84,464

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Investment in Direct Financing Lease - Narrative (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Capital Leases, Net Investment in Direct Financing Leases [Abstract]
Percentage of term exceeding useful life of one office tower	75.00%
Carrying amount of net investment in direct financing lease		$ 12,500,000
Allowance for losses related to our direct financing lease		$ 0

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Equity Investments - Schedule of Equity Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Equity in earnings of investees	$ 0	$ 24,460	$ 25,754
SIR
Schedule of Equity Method Investments [Line Items]
Equity in earnings of investees		24,516	21,153
GOV
Schedule of Equity Method Investments [Line Items]
Equity in earnings of investees		0	4,111
AIC
Schedule of Equity Method Investments [Line Items]
Equity in earnings of investees		$ (56)	$ 490

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Equity Investments - Narrative (Details) $ / shares in Units, $ in Thousands					3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 09, 2014 USD ($) $ / shares shares	May. 09, 2014 USD ($) company shares	Jul. 02, 2013 USD ($) $ / shares shares	Mar. 15, 2013 USD ($) $ / shares shares	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($) $ / shares shares	Jul. 09, 2014 USD ($) $ / shares	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jul. 03, 2013 shares
Schedule of Equity Method Investments [Line Items]
Gain on sale of equity investment									$ 0	$ 171,561	$ 66,293
Proceeds from issuance of common shares, net									0	0	626,809
Gain on issuance of shares by an equity investee									$ 0	$ 17,020	0
AIC
Schedule of Equity Method Investments [Line Items]
Equity investments, number of shares sold (in shares) | shares		20,000
Equity investments, proceeds from sale		$ 5,800
Ownership Percentage		0.00%
Amount invested in equity investee		$ 5,800
Number of other companies which are shareholders of related party | company		5
SIR
Schedule of Equity Method Investments [Line Items]
Equity investments, number of shares sold (in shares) | shares	22,000,000
Equity investments, proceeds from sale	$ 704,800
Price per common share (in dollars per share) | $ / shares	$ 32.04						$ 32.04
Gain on sale of equity investment	$ 171,800				$ 171,800
Ownership Percentage	0.00%		56.00%			36.70%	0.00%
Issuance of shares, net (in shares) | shares			10,500,000			10,000,000
Common stock price per share (in dollars per share) | $ / shares			$ 28.25			$ 29.00
Proceeds from issuance of common shares, net						$ 277,400
Gain on issuance of shares by an equity investee						$ 16,900
Equity investments, common shares owned (in shares) | shares			22,000,000									22,000,000
Less than wholly owned subsidiary, parent ownership interest percentage												44.20%
Market value of common shares exceeding carrying value			$ 17,600
Amortization of the difference between carrying value and share of underlying equity			34 years
Cash distributions							$ 20,700	$ 19,800
GOV
Schedule of Equity Method Investments [Line Items]
Ownership Percentage				18.20%
Common stock price per share (in dollars per share) | $ / shares				$ 25.20
Gain on issuance of shares by an equity investee				$ 66,300
Equity investments, common shares owned (in shares) | shares				9,950,000
Cash distributions											$ 4,300
Gross proceeds received on issuance or sale of common stock				$ 250,700
Net proceeds received on issuance or sale of common shares				$ 239,600

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Equity Investments - Summary of Unaudited Income Statement Information of Equity Method Investee (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended								6 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jul. 09, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statements:
Rental income											$ 570,382	$ 691,699	$ 763,262
Tenant reimbursements and other income											144,509	170,158	189,767
Total revenues		$ 138,934	$ 159,208	$ 203,694	$ 213,055	$ 212,808	$ 216,595	$ 215,194	$ 217,260		714,891	861,857	953,029
Operating expenses											324,948	387,982	410,045
General and administrative											57,457	113,155	80,504
Total expenses											593,568	913,741	849,522
Operating income (loss)											121,323	(51,884)	103,507
Interest expense											(107,316)	(143,230)	(173,011)
Gain (loss) on early extinguishment of debt	$ (60,000)										6,661	4,909	(60,052)
Income (loss) from continuing operations before income taxes and equity in earnings of investees											102,221	(63)	(60,438)
Income tax expense											(2,364)	(3,191)	(2,634)
Equity in earnings of investees											0	24,460	25,754
Net income (loss)											$ 99,857	$ 24,012	$ (156,967)
Weighted average common shares outstanding (in shares)											128,621	125,163	112,378
Net income per common share (in dollars per share)		$ 0.29	$ 0.18	$ 0.04	$ 0.05	$ (1.28)	$ 1.16	$ (0.14)	$ 0.08		$ 0.56	$ (0.19)	$ (1.97)
SIR
Income Statements:
Rental income										$ 98,226			$ 159,011
Tenant reimbursements and other income										16,980			29,312
Total revenues										115,206			188,323
Operating expenses										20,982			36,382
Depreciation and amortization										20,832			31,091
Acquisition related costs										374			2,002
General and administrative										7,731			12,423
Total expenses										49,919			81,898
Operating income (loss)										65,287			106,425
Interest expense										(7,287)			(13,763)
Gain (loss) on early extinguishment of debt										243			0
Income (loss) from continuing operations before income taxes and equity in earnings of investees										58,243			92,662
Income tax expense										(90)			96
Equity in earnings of investees										32			334
Net income (loss)										$ 58,185			$ 93,092
Weighted average common shares outstanding (in shares)										52,394			44,565
Net income per common share (in dollars per share)										$ 1.11			$ 2.09

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Other Assets - Narrative (Details)	1 Months Ended					12 Months Ended
	Dec. 31, 2013 building property	Sep. 30, 2013 USD ($)	Jun. 30, 2013 building property	Jan. 31, 2013 USD ($) building property	Apr. 30, 2012 USD ($)	Dec. 31, 2015 USD ($) building	Dec. 31, 2013 USD ($) building property	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total real estate mortgage receivable included in other assets, carrying value						$ 8,087,000
Mortgage financing related to property sold							$ 7,688,000
Number of properties sold or agreed to be sold | property				3
Number of buildings sold | building				18
Real estate mortgages receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for losses related to real estate mortgages receivable						$ 0		$ 0
Sales of properties resulting in gains and losses | Properties Sold in December
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage financing related to property sold		$ 1,000,000			$ 400,000
Interest rate on real estate mortgage receivable					6.00%
Disposed of by Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of buildings sold | building						135
Disposed of by Sale | Sales of properties resulting in gains and losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage financing related to property sold				$ 7,700,000
Interest rate on real estate mortgage receivable				6.00%
Number of properties sold or agreed to be sold | property			1	3			7
Number of buildings sold | building			1	18			59
Disposed of by Sale | Sales of properties resulting in gains and losses | Properties Sold in December
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of properties sold or agreed to be sold | property	3
Number of buildings sold | building	40

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Other Assets - Summary of Deferred Financing Fees, Deferred Leasing Costs and Capitalized Lease Incentives (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Finance Costs [Abstract]
Deferred financing fees	$ 43,346	$ 41,339
Accumulated amortization	(25,158)	(24,478)
Deferred financing fees, net	18,188	16,861
Deferred Costs, Leasing, Net [Abstract]
Deferred leasing costs	166,390	184,600
Accumulated amortization	(56,162)	(58,348)
Deferred leasing costs, net	110,228	126,252
Capital Lease Incentives, Net [Abstract]
Capitalized lease incentives	11,623	22,650
Accumulated amortization	(2,498)	(7,459)
Capitalized lease incentives, net	$ 9,125	$ 15,191

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Other Assets - Summary of Future Amortization of Deferred Leasing Costs and Capitalized Lease Incentives (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Leasing, Amortization Expense, Fiscal Year Maturity [Abstract]
2016	$ 15,933
2017	14,870
2018	13,369
2019	12,246
2020	10,324
Thereafter	43,486
Deferred leasing costs, net	110,228	$ 126,252
Capitalized Lease Incentives, Amortization Expense, Fiscal Year Maturity [Abstract]
2016	1,528
2017	1,477
2018	779
2019	704
2020	608
Thereafter	4,029
Capitalized lease incentives, net	$ 9,125	$ 15,191

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Indebtedness - Schedule of Outstanding Indebtedness (Details) - USD ($)	Dec. 31, 2015	May. 01, 2015	Jan. 29, 2015	Jan. 28, 2015	Dec. 31, 2014	Dec. 05, 2014
Debt Instrument [Line Items]
Outstanding indebtedness	$ 1,711,666,000				$ 2,201,537,000
Unamortized net premiums and discounts	(1,342,000)				6,128,000
Total	$ 1,710,324,000				2,207,665,000
Unsecured revolving credit facility, at LIBOR plus a premium
Debt Instrument [Line Items]
Interest rate stated percentage	1.6795%
Outstanding indebtedness	$ 0				0
5-year unsecured term loan, at LIBOR plus a premium
Debt Instrument [Line Items]
Interest rate stated percentage	1.8295%
Outstanding indebtedness	$ 200,000,000				0
Total	$ 200,000,000		$ 200,000,000.0
7-year unsecured term loan, at LIBOR plus a premium
Debt Instrument [Line Items]
Interest rate stated percentage	2.2295%
Outstanding indebtedness	$ 200,000,000				0
Total	$ 200,000,000.0		$ 200,000,000.0
Unsecured term loan, at LIBOR plus a premium
Debt Instrument [Line Items]
Interest rate stated percentage	0.00%
Outstanding indebtedness	$ 0			$ 500,000,000.0	400,000,000	$ 400,000,000
Unsecured floating rate debt
Debt Instrument [Line Items]
Interest rate stated percentage	2.03%
Outstanding indebtedness	$ 400,000,000				400,000,000
5.75% Senior Unsecured Notes due 2015
Debt Instrument [Line Items]
Interest rate stated percentage	0.00%	5.75%
Outstanding indebtedness	$ 0				138,773,000
6.25% Senior Unsecured Notes due 2016
Debt Instrument [Line Items]
Interest rate stated percentage	6.25%
Outstanding indebtedness	$ 139,104,000				139,104,000
6.25% Senior Unsecured Notes due 2017
Debt Instrument [Line Items]
Interest rate stated percentage	6.25%
Outstanding indebtedness	$ 250,000,000				250,000,000
6.65% Senior Unsecured Notes due 2018
Debt Instrument [Line Items]
Interest rate stated percentage	6.65%
Outstanding indebtedness	$ 250,000,000				250,000,000
5.875% Senior Unsecured Notes due 2020
Debt Instrument [Line Items]
Interest rate stated percentage	5.875%
Outstanding indebtedness	$ 250,000,000				250,000,000
5.75% Senior Unsecured Notes due 2042
Debt Instrument [Line Items]
Interest rate stated percentage	5.75%
Outstanding indebtedness	$ 175,000,000				175,000,000
Unsecured fixed rate debt
Debt Instrument [Line Items]
Interest rate stated percentage	6.17%
Outstanding indebtedness	$ 1,064,104,000				1,202,877,000
Mortgage Notes Payable Encumbering 111 Monument Circle
Debt Instrument [Line Items]
Interest rate stated percentage	0.00%
Outstanding indebtedness	$ 0				116,000,000
Mortgage Notes Payable Encumbering 225 Water Street
Debt Instrument [Line Items]
Interest rate stated percentage	0.00%
Outstanding indebtedness	$ 0				40,059,000
Mortgage Notes Payable Encumbering 111 East Wacker Drive
Debt Instrument [Line Items]
Interest rate stated percentage	0.00%
Outstanding indebtedness	$ 0				142,666,000
Mortgage Notes Payable Encumbering 2501 20th Place South
Debt Instrument [Line Items]
Interest rate stated percentage	0.00%
Outstanding indebtedness	$ 0				10,267,000
Mortgage Notes Payable Encumbering Parkshore Plaza
Debt Instrument [Line Items]
Interest rate stated percentage	5.67%
Outstanding indebtedness	$ 41,275,000				41,275,000
Mortgage Notes Payable Encumbering 1735 Market Street
Debt Instrument [Line Items]
Interest rate stated percentage	5.66%
Outstanding indebtedness	$ 169,612,000				171,498,000
Mortgage Notes Payable Encumbering 206 East 9th Street
Debt Instrument [Line Items]
Interest rate stated percentage	5.69%
Outstanding indebtedness	$ 27,515,000				27,965,000
Mortgage Notes Payable Encumbering 1320 Main Street
Debt Instrument [Line Items]
Interest rate stated percentage	0.00%
Outstanding indebtedness	$ 0				38,979,000
Mortgage Notes Payable Encumbering 33 Stiles Lane
Debt Instrument [Line Items]
Interest rate stated percentage	6.75%
Outstanding indebtedness	$ 2,785,000				3,132,000
Mortgage Notes Payable Encumbering 97 Newberry Road
Debt Instrument [Line Items]
Interest rate stated percentage	5.71%
Outstanding indebtedness	$ 6,375,000				6,819,000
Secured Fixed Rate Debt
Debt Instrument [Line Items]
Interest rate stated percentage	5.68%
Outstanding indebtedness	$ 247,562,000				$ 598,660,000

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Indebtedness - Schedule of Outstanding Indebtedness (Footnote) (Details)	12 Months Ended
	Dec. 31, 2015
Mortgage Notes Payable Encumbering 1735 Market Street
Debt Instrument [Line Items]
Variable rate basis	LIBOR
Period for which interest on loan payable is fixed by a cash flow hedge	7 years
Interest accrual rate	5.66%
LIBOR
Debt Instrument [Line Items]
Basis points on variable rate	2.625%

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Indebtedness - Narrative (Details)														1 Months Ended	3 Months Ended	10 Months Ended	11 Months Ended	12 Months Ended
	Dec. 01, 2015 USD ($)	Aug. 03, 2015 USD ($)	Jun. 05, 2015 USD ($)	Jun. 03, 2015 USD ($)	May. 01, 2015 USD ($)	Jan. 29, 2015 USD ($) option	Dec. 05, 2014 USD ($)	Nov. 17, 2014 USD ($)	Oct. 31, 2014 USD ($)	Sep. 15, 2014 USD ($)	Aug. 01, 2014 USD ($)	Jun. 27, 2014 USD ($)	Mar. 11, 2014 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) building property	May. 22, 2015	Dec. 31, 2015 USD ($) building property	Dec. 31, 2015 USD ($) building property	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	May. 31, 2015 USD ($)	Jan. 28, 2015 USD ($)
Debt Instrument [Line Items]
Outstanding indebtedness															$ 1,711,666,000		$ 1,711,666,000	$ 1,711,666,000	$ 2,201,537,000
Term loan amount outstanding															1,710,324,000		1,710,324,000	1,710,324,000	2,207,665,000
Gain (loss) on early extinguishment of debt														$ (60,000,000)				6,661,000	4,909,000	$ (60,052,000)
Outstanding principal														670,300,000
Purchase price														$ 726,200,000
Real estate properties, net															2,988,413,000		2,988,413,000	2,988,413,000	4,697,998,000
Mortgage notes payable, net															249,732,000		249,732,000	$ 249,732,000	$ 609,249,000
LIBOR
Debt Instrument [Line Items]
Basis points on variable rate																		2.625%
Revolving credit facility
Debt Instrument [Line Items]
Interest rate payable percentage																		1.68%
Revolving credit facility															0		$ 0	$ 0
Revolving credit facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage																	0.125%
Revolving credit facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage																	0.30%
Revolving credit facility | LIBOR
Debt Instrument [Line Items]
Basis points on variable rate																	1.25%
Revolving credit facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis points on variable rate																	0.875%
Revolving credit facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis points on variable rate																	1.55%
Revolving credit facility | Base rate | Minimum
Debt Instrument [Line Items]
Basis points on variable rate																	0.00%
Revolving credit facility | Base rate | Maximum
Debt Instrument [Line Items]
Basis points on variable rate																	0.55%
Unsecured revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 750,000,000.0																$ 750,000,000.0
Gain (loss) on early extinguishment of debt																		(400,000)
Number of extension options | option						2
Extension option term						6 months
Extension option fee, percent						0.075%
Amount available for borrowing															750,000,000.0		$ 750,000,000.0	750,000,000.0
Basis points on variable rate																			1.50%
Commitment fee percentage																			0.35%
Unsecured revolving credit facility | Letter of credit
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 100,000,000.0
Unsecured term loan, due December 2016
Debt Instrument [Line Items]
Repayments of debt							$ 100,000,000
Outstanding indebtedness							$ 400,000,000								$ 0		$ 0	$ 0	$ 400,000,000			$ 500,000,000.0
Interest rate stated percentage															0.00%		0.00%	0.00%
Basis points on variable rate																			1.85%
Loan facility, 5-year term
Debt Instrument [Line Items]
Outstanding indebtedness															$ 200,000,000		$ 200,000,000	$ 200,000,000	$ 0
Term loan amount outstanding						$ 200,000,000.0									$ 200,000,000		$ 200,000,000	$ 200,000,000
Interest accrual rate																		1.83%
Interest rate stated percentage															1.8295%		1.8295%	1.8295%
Loan facility, 5-year term | LIBOR
Debt Instrument [Line Items]
Basis points on variable rate																	1.40%
Loan facility, 5-year term | LIBOR | Minimum
Debt Instrument [Line Items]
Basis points on variable rate																	0.90%
Loan facility, 5-year term | LIBOR | Maximum
Debt Instrument [Line Items]
Basis points on variable rate																	1.80%
Loan facility, 5-year term | Revolving credit facility
Debt Instrument [Line Items]
Debt instrument, term						5 years
Loan facility, 7-year term
Debt Instrument [Line Items]
Outstanding indebtedness															$ 200,000,000		$ 200,000,000	$ 200,000,000	0
Term loan amount outstanding						$ 200,000,000.0									$ 200,000,000.0		$ 200,000,000.0	$ 200,000,000.0
Interest accrual rate																		2.23%
Interest rate stated percentage															2.2295%		2.2295%	2.2295%
Loan facility, 7-year term | LIBOR
Debt Instrument [Line Items]
Basis points on variable rate																	1.80%
Loan facility, 7-year term | LIBOR | Minimum
Debt Instrument [Line Items]
Basis points on variable rate																	1.40%
Loan facility, 7-year term | LIBOR | Maximum
Debt Instrument [Line Items]
Basis points on variable rate																	2.35%
Loan facility, 7-year term | Revolving credit facility
Debt Instrument [Line Items]
Debt instrument, term						7 years
Revolving credit facility and term loans
Debt Instrument [Line Items]
Additional increases in maximum amount of borrowings available						$ 1,150,000,000.00
5.75% Senior Unsecured Notes due 2015
Debt Instrument [Line Items]
Outstanding indebtedness															$ 0		$ 0	$ 0	138,773,000
Gain (loss) on early extinguishment of debt					$ (100,000)
Amount of debt, redeemed, defeased, or prepaid					$ 138,800,000
Interest rate stated percentage					5.75%										0.00%		0.00%	0.00%
Senior Notes 7.50% Due 2019 | Mortgage notes
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt								$ (1,800,000)
Amount of debt, redeemed, defeased, or prepaid								$ 125,000,000
Interest rate stated percentage								7.50%
Senior Notes 6.40% Due 2015 | Mortgage notes
Debt Instrument [Line Items]
Amount of debt, redeemed, defeased, or prepaid										$ 33,400,000
Interest rate stated percentage										6.40%
Mortgage notes
Debt Instrument [Line Items]
Number of real estate properties secured by mortgage | property															5		5	5
Number of buildings secured by mortgage | building															8		8	8
Real estate properties, net															$ 287,500,000		$ 287,500,000	$ 287,500,000
Mortgage notes payable, net															249,700,000		249,700,000	249,700,000
Mortgage notes | 111 East Wacker Drive
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt															(3,900,000)
Amount of debt, redeemed, defeased, or prepaid		$ 141,400,000
Mortgage notes | 1320 Main Street
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt																		(6,200,000)
Amount of debt, redeemed, defeased, or prepaid				$ 38,700,000
Mortgage notes | 225 Water Street in Jacksonville, Florida
Debt Instrument [Line Items]
Outstanding indebtedness																					$ 40,100,000
Gain (loss) on early extinguishment of debt																		17,300,000
Interest accrual rate																10.03%
Default interest																4.00%
Mortgage notes | Mortgage notes
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt												$ (3,300,000)
Mortgage Notes Payable Encumbering 111 Monument Circle
Debt Instrument [Line Items]
Outstanding indebtedness															$ 0		$ 0	$ 0	$ 116,000,000
Interest rate stated percentage															0.00%		0.00%	0.00%
Mortgage Notes Payable Encumbering 111 Monument Circle | Mortgage notes
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt	$ 600,000
Amount of debt, redeemed, defeased, or prepaid	$ 116,000,000
Interest rate stated percentage	5.24%
7.36% Mortgage Debt | Mortgage notes | 2501 20th Place South
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt																		$ (600,000)
Amount of debt, redeemed, defeased, or prepaid			$ 10,000,000
Interest rate stated percentage			7.36%
Mortgage Notes Payable Encumbering 6200 Glenn Carlson Drive | Mortgage notes
Debt Instrument [Line Items]
Repayments of debt									$ 7,800,000
Mortgage Notes Payable Encumbering 600 West Chicago Avenue | Mortgage notes
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt											$ 6,700,000
Amount of debt, redeemed, defeased, or prepaid											$ 265,000,000
Interest rate stated percentage											5.68%
Mortgage Notes Payable Six Point One Four Percent Due in 2023 | Mortgage notes
Debt Instrument [Line Items]
Amount of debt, redeemed, defeased, or prepaid												$ 11,200,000
Interest rate stated percentage												6.14%
Mortgage Notes Payable 5.78% Due in 2015 | Mortgage notes
Debt Instrument [Line Items]
Amount of debt, redeemed, defeased, or prepaid												$ 8,500,000
Interest rate stated percentage												5.78%
Mortgage Notes Payable Encumbering 3920 Arkwright Road | Mortgage notes
Debt Instrument [Line Items]
Amount of debt, redeemed, defeased, or prepaid													$ 12,000,000
Interest rate stated percentage													4.95%

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Indebtedness - Schedule of Required Principal Payments on Outstanding Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
2016	$ 142,450
2017	294,865
2018	253,847
2019	164,613
2020	451,674
Thereafter	404,217
Total	$ 1,711,666	$ 2,201,537

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Shareholders' Equity - Narrative (Details)		1 Months Ended	3 Months Ended				12 Months Ended
	Mar. 25, 2014 USD ($) $ / shares shares	Jan. 31, 2014 USD ($) $ / shares	Dec. 31, 2014 $ / shares shares	Sep. 30, 2014 $ / shares	Jun. 30, 2014 $ / shares	Mar. 31, 2014 $ / shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($)	Sep. 14, 2015 USD ($)	Aug. 24, 2015 USD ($)
Class of Stock [Line Items]
Distributions on common stock declared (in dollars per share) | $ / shares		$ 0.25	$ 0	$ 0	$ 0	$ 0.25
Distributions paid or declared on common shares | $		$ 29,600,000
Distribution for the excess of the market value of common shares issued above carrying value of series D preferred shares redeemed | $							$ 0	$ 16,205,000	$ 0
Distribution percentage to shareholders consisting of an alternative minimum tax adjustment							0.00%	15.41%	0.00%
Common Shares
Class of Stock [Line Items]
Common shares issued to holders of preferred shares (in shares)							144	10,412,499
Stock repurchase program, authorized amount | $											$ 100,000,000.0
Stock repurchase program, additional authorized amount | $										$ 100,000,000.0
Number of shares repurchased (in shares)							3,410,300
Price per common share (in dollars per share) | $ / shares							$ 25.76
Common shares from conversion of preferred shares (in shares)							2,363,103
Common Shares | Fundamental change conversion right
Class of Stock [Line Items]
Preferred shares converted into common shares (in shares)	10,411,779
Series D
Class of Stock [Line Items]
Number of shares repurchased (in shares)							301	10,264,503
Preferred shares, of beneficial interest, shares outstanding (in shares)			4,915,497				4,915,196	4,915,497
Preferred shares dividend (in dollars per share) | $ / shares							$ 1.625
Preferred shares, dividend yield							6.50%	6.50%
Initial conversion rate							0.480775
Initial conversion price per share (in dollars per share) | $ / shares							$ 52.000
Additional common shares (in shares)							2,363,103
Liquidation preference (in dollars per share) | $ / shares	$ 25.00						$ 25.00
Percentage of average closing market price of the entity's common stock based on which ratio for conversion of preferred shares into common shares is determined	98.00%						98.00%
Purchase price as a percentage of liquidation preference							100.00%
Number of consecutive trading days for calculating the average closing sale price of common shares	5 days
Common shares from conversion of preferred shares (in shares)							4,915,196
Series D | Fundamental change conversion right
Class of Stock [Line Items]
Preferred shares converted into common shares (in shares)	10,263,003
Distribution for the excess of the market value of common shares issued above carrying value of series D preferred shares redeemed | $	$ 16,200,000
Series E
Class of Stock [Line Items]
Preferred shares, of beneficial interest, shares outstanding (in shares)			11,000,000				11,000,000	11,000,000
Preferred shares dividend (in dollars per share) | $ / shares							$ 1.8125
Preferred shares, dividend yield							7.25%	7.25%
Liquidation preference (in dollars per share) | $ / shares							$ 25.00
Redemption price (in dollars per share) | $ / shares							$ 25.00
RMR
Class of Stock [Line Items]
Common shares issued (in shares)								90,135

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Shareholders' Equity - Schedule of Distributions Paid Per Common Share (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stockholders' Equity Note [Abstract]
Ordinary income	0.00%	0.00%	0.00%
Return of capital	0.00%	0.00%	100.00%
Capital gain	0.00%	100.00%	0.00%
Unrecaptured Section 1250 gain	0.00%	0.00%	0.00%
Common share, distributions paid	0.00%	100.00%	100.00%

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Shareholders' Equity - Schedule of Declared Distributions (Details) - $ / shares	Oct. 09, 2015	Jul. 09, 2015	Apr. 08, 2015	Jan. 16, 2015
Series D
Class of Stock [Line Items]
Dividend declared (in dollars per share)	$ 0.40625	$ 0.40625	$ 0.40625	$ 0.40625
Series E
Class of Stock [Line Items]
Dividend declared (in dollars per share)	$ 0.453125	$ 0.453125	$ 0.453125	$ 0.453125

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Cumulative Other Comprehensive Loss - Schedule of Amounts Recognized in Cumulative Other Comprehensive Loss (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balances as of January 1, 2015	$ (53,216)
Other comprehensive loss before reclassifications	(15,522)
Amounts reclassified from cumulative other comprehensive loss to net income	65,051
Net current period other comprehensive income	49,529
Balances as of December 31, 2015	(3,687)
Unrealized Loss on Derivative Instruments and Other Assets
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balances as of January 1, 2015	(4,299)
Other comprehensive loss before reclassifications	(1,232)
Amounts reclassified from cumulative other comprehensive loss to net income	1,844
Net current period other comprehensive income	612
Balances as of December 31, 2015	(3,687)
Foreign Currency Translation Adjustments
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balances as of January 1, 2015	(48,917)
Other comprehensive loss before reclassifications	(14,290)
Amounts reclassified from cumulative other comprehensive loss to net income	63,207
Net current period other comprehensive income	48,917
Balances as of December 31, 2015	$ 0

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Cumulative Other Comprehensive Loss - Schedule of Reclassifications Out of Cumulative Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassifications out of cumulative other comprehensive income (Loss)
Interest expense	$ 107,316	$ 143,230	$ 173,011
Gain on sale of properties	84,421	0	1,596
Interest and other income	(5,989)	$ (1,561)	$ (1,229)
Total amounts reclassified	(65,051)
Foreign currency translation adjustment activity
Reclassifications out of cumulative other comprehensive income (Loss)
Total amounts reclassified	(63,207)
Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income
Reclassifications out of cumulative other comprehensive income (Loss)
Total amounts reclassified	65,051
Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income | Foreign currency translation adjustment activity
Reclassifications out of cumulative other comprehensive income (Loss)
Gain on sale of properties	63,207
Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income | Realized gain on available for sale securities
Reclassifications out of cumulative other comprehensive income (Loss)
Interest and other income	(3,080)
Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income | Interest rate swap contracts
Reclassifications out of cumulative other comprehensive income (Loss)
Interest expense	$ 4,924

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Income Taxes - Schedule of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
State	$ 270	$ 350	$ 519
Federal	513	0	0
Foreign	2,336	2,772	2,572
Current income tax expense (benefit)	3,119	3,122	3,091
Deferred:
Foreign	(755)	69	(457)
Deferred income tax expense (benefit)	(755)	69	(457)
Income tax expense	$ 2,364	$ 3,191	$ 2,634

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Income Taxes - Schedule of Reconciliation of Effective Tax Rate and the U.S. Federal Statutory Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Taxes at statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
Dividends paid deduction and net operating loss utilization	(35.00%)	(35.00%)	(35.00%)
Federal taxes on built-in gain	0.50%	0.00%	0.00%
State, local, and foreign income taxes	1.81%	11.73%	(1.71%)
Effective tax rate	2.31%	11.73%	(1.71%)

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Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Real Estate Properties [Line Items]
Deferred tax assets		$ 2.4
Valuation allowance		0.6
Deferred tax liabilities		$ 3.1
Australian Properties
Real Estate Properties [Line Items]
Income Tax Expense (Benefit)	$ 1.6

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Derivative Instruments - Narrative (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Aggregate termination value	$ 4,100,000.0
Interest rate swap
Derivative [Line Items]
Fair value of derivatives in a net liability position	4,100,000
Cash flow hedging | Designated as hedging instrument
Derivative [Line Items]
Estimated gain (loss) reclassification from OCI to income	3,700,000
Cash flow hedging | Designated as hedging instrument | Interest rate swap
Derivative [Line Items]
Amount of hedged item	$ 169,600,000
Derivative, variable interest rate	LIBOR

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Derivative Instruments - Schedule of Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk (Details) - Interest rate swap - Cash flow hedging - Designated as hedging instrument $ in Thousands	Dec. 31, 2015 USD ($) financial_instrument
Derivative [Line Items]
Number of Instruments | financial_instrument	2
Notional Amount (in thousands) | $	$ 169,612

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Derivative Instruments - Schedule of Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Interest rate swap | Cash flow hedging | Designated as hedging instrument | Accounts payable and accrued expenses
Derivatives, Fair Value [Line Items]
Pay-fixed swaps	$ 3,687	$ 7,462

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Derivative Instruments - Schedule of Gain or Loss Recognized on Interest Rate Derivatives Designated as Cash Flow Hedges (Details) - Cash flow hedging - Designated as hedging instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Rate Cash Flow Hedges [Roll Forward]
Balance at beginning of period	$ (7,462)	$ (11,706)	$ (16,624)
Amount of loss recognized in cumulative other comprehensive loss	(1,149)	(776)	(103)
Amount of loss reclassified from cumulative other comprehensive loss into interest expense	4,924	5,020	5,021
Unrealized gain on derivative instruments	3,775	4,244	4,918
Balance at end of period	$ (3,687)	$ (7,462)	$ (11,706)

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Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions						3 Months Ended	12 Months Ended							14 Months Ended
	Jun. 16, 2015 USD ($) trustee $ / shares shares	Jan. 28, 2015 tranche $ / shares shares	Oct. 28, 2014	Mar. 25, 2014 shares	Jan. 28, 2014 trustee $ / shares shares	Jun. 30, 2014	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares	Dec. 31, 2016 shares	Dec. 31, 2015 USD ($) tranche $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Jul. 31, 2014 trustee	Jul. 09, 2014 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of independent trustees | trustee	11													11
Number of equity awards granted (in shares)												4,000	83,450
Granted (in dollars per share) | $ / shares												$ 23.46	$ 23.29
Unvested Number of Shares, Ending (in shares)												0	130,914
Vested (in shares)												134,914	66,639
Number of independent trustees | trustee														5
Common shares of beneficial interest, par value (in dollars per share) | $ / shares											$ 0.01	$ 0.01
SIR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $													$ 0.4
Price per common share (in dollars per share) | $ / shares															$ 32.04
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price per common share (in dollars per share) | $ / shares											$ 25.76
Vesting on January 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent											20.00%
Vesting on January 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent											20.00%
Trustees | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares granted in period (in shares)					2,000
Common shares of beneficial interest, par value (in dollars per share) | $ / shares					$ 0.01
Price per common share (in dollars per share) | $ / shares					$ 23.46
Number of trustees | trustee					2
Officers and Employees | Employee Stock | RMR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $												$ 3.4
Officers and Employees | Employee Stock | Common Stock | RMR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares issued (in shares)				130,914
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of independent trustees | trustee	9
Share based compensation amount | $	$ 0.1
Number of equity awards granted (in shares)	34,587	126,319									160,906	713,727
Price per share (in dollars per share) | $ / shares	$ 26.02
Vesting period	1 year	4 years
Granted (in dollars per share) | $ / shares		$ 26.58									$ 26.46	$ 26.66
Unvested Number of Shares, Ending (in shares)											776,456	710,182	0
Vested (in shares)											86,517	3,545
Estimated future compensation expense for unvested shares | $											$ 14.6
Weighted average period over which compensation expense will be recorded											2 years 9 months 18 days
Restricted shares | RMR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)													73,450
Vesting period						4 years
Restricted shares | Scenario, Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)							62,351	339,759	185,467	188,879
Restricted shares | Independent Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)	3,843
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of incentive plan after effective date (in years)											4 years	4 years
Number of equity awards granted (in shares)		639,250									639,250	1,266,237
Granted (in dollars per share) | $ / shares											$ 15.47	$ 15.99
Unvested Number of Shares, Ending (in shares)											1,884,110	1,266,237	0
Vested (in shares)											0	0
Estimated future compensation expense for unvested shares | $											$ 20.3
Weighted average period over which compensation expense will be recorded											2 years 4 months 24 days
Number of tranches | tranche		2									2
Restricted stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of RSU grants grant recipients may earn			0.00%
Restricted stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of RSU grants grant recipients may earn			100.00%
Restricted stock units | Vesting on January 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent		50.00%									50.00%
Restricted stock units | Vesting on January 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent		50.00%									50.00%
2015 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of incentive plan after effective date (in years)	10 years
2015 Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for issuance (in shares)	3,250,000
Share award plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for issuance (in shares)											3,215,413
Compensation expense | $												$ 3.4	$ 1.8
Share award plan | General and administrative expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $											$ 15.4	$ 2.6
Share award plan | Trustees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)													2,000
Aggregate market value of shares awarded | $													$ 0.2

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Share-Based Compensation - Summary of Restricted Share and Restricted Stock Unit Activity (Details) - $ / shares			12 Months Ended
	Jun. 16, 2015	Jan. 28, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Shares
Unvested Number of Shares, Beginning (in shares)			0	130,914	114,703
Granted (in shares)				4,000	83,450
Vested (in shares)				(134,914)	(66,639)
Forfeited (in shares)					(600)
Unvested Number of Shares, Ending (in shares)				0	130,914
Weighted Average Grant Date Fair Value
Unvested Shares, Weighted Average Grant Date Fair Value, Beginning (in dollars per share)			$ 0.00	$ 20.70	$ 19.39
Granted (in dollars per share)				23.46	23.29
Vested (in dollars per share)				25.79	23.06
Forfeited (in dollars per share)					22.49
Unvested Shares, Weighted Average Grant Date Fair Value, Ending (in dollars per share)				$ 0.00	$ 20.70
Restricted shares
Number of Shares
Unvested Number of Shares, Beginning (in shares)			710,182	0
Granted (in shares)	34,587	126,319	160,906	713,727
Vested (in shares)			(86,517)	(3,545)
Forfeited (in shares)			(8,115)
Unvested Number of Shares, Ending (in shares)			776,456	710,182	0
Weighted Average Grant Date Fair Value
Unvested Shares, Weighted Average Grant Date Fair Value, Beginning (in dollars per share)				$ 0.00
Granted (in dollars per share)		$ 26.58	$ 26.46	26.66
Vested (in dollars per share)			26.02	$ 26.66
Forfeited (in dollars per share)			$ 26.64
Unvested Shares, Weighted Average Grant Date Fair Value, Ending (in dollars per share)					$ 0.00
Restricted stock units
Number of Shares
Unvested Number of Shares, Beginning (in shares)			1,266,237	0
Granted (in shares)		639,250	639,250	1,266,237
Vested (in shares)			0	0
Forfeited (in shares)			(21,377)
Unvested Number of Shares, Ending (in shares)			1,884,110	1,266,237	0
Weighted Average Grant Date Fair Value
Unvested Shares, Weighted Average Grant Date Fair Value, Beginning (in dollars per share)				$ 0.00
Granted (in dollars per share)			$ 15.47	15.99
Vested (in dollars per share)			0.00	$ 0.00
Forfeited (in dollars per share)			$ 15.80
Unvested Shares, Weighted Average Grant Date Fair Value, Ending (in dollars per share)					$ 0.00

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Share-Based Compensation - Summary of Assumptions and Fair Values for Restricted Stock Units Granted in the Period (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of RSUs granted (in dollars per share)		$ 23.46	$ 23.29
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of RSUs granted (in dollars per share)	$ 15.47	$ 15.99
Expected term (years)	4 years	4 years
Expected volatility	0.00%	0.00%
Expected dividend yield	1.88%	1.88%
Risk-free rate	0.81%	0.84%

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Share-Based Compensation - Schedule of Shares Granted and Vested (Details) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Number of Shares
Unvested Number of Shares, Beginning (in shares)	130,914	114,703
Granted (in shares)	4,000	83,450
Vested (in shares)	(134,914)	(66,639)
Forfeited (in shares)		(600)
Unvested Number of Shares, Ending (in shares)	0	130,914
Weighted Average Grant Date Fair Value
Unvested Shares, Weighted Average Grant Date Fair Value, Beginning (in dollars per share)	$ 20.70	$ 19.39
Granted (in dollars per share)	23.46	23.29
Vested (in dollars per share)	25.79	23.06
Forfeited (in dollars per share)		22.49
Unvested Shares, Weighted Average Grant Date Fair Value, Ending (in dollars per share)	$ 0.00	$ 20.70

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Defined Contribution Plan (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of match	100.00%
Employer matching contribution, percent of employees' gross pay	3.00%
Employer maximum contribution	$ 8,000
Employer matching contribution in excess of three percent of employee contribution, percent of match	50.00%
Employer contribution amount	$ 300,000
Maximum
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employees' gross pay	5.00%
Minimum
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employees' gross pay	3.00%

XML

Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Measure at Fair Value (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$ (3,687)	$ (7,462)
Derivative liability	(7,219)	(6,658)
Level 1
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	0	0
Derivative liability	0	0
Level 2
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	(3,687)	(7,462)
Derivative liability	0	0
Level 3
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	0	0
Derivative liability	$ (7,219)	$ (6,658)

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Fair Value of Assets and Liabilities - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) Tenant	Dec. 31, 2014 USD ($) ft² property	Jul. 31, 2014 USD ($) $ / shares	Mar. 31, 2014 ft²
Fair value of assets and liabilities
Impairment of Real Estate		$ 17,200
Number of properties | property			31
Property square feet | ft²			5,600,000		5,641,450
Real estate properties, net		$ 2,988,413	$ 4,697,998
Number of tenants responsible for more than 3% of total annualized rents | Tenant		0
Total rents | Credit concentration
Fair value of assets and liabilities
Concentration risk		4.00%
225 Water Street in Jacksonville, Florida
Fair value of assets and liabilities
Loss on asset impairment			22,700
Level 3 | Real estate properties held for sale | Discounted cash flows
Fair value of assets and liabilities
Fair value of assets			414,625
Carrying Amount | Nonrecurring | 225 Water Street in Jacksonville, Florida
Fair value of assets and liabilities
Real estate properties, net			42,300
Fair value | Nonrecurring | 225 Water Street in Jacksonville, Florida
Fair value of assets and liabilities
Fair value of assets			$ 19,600
Disposition Plan
Fair value of assets and liabilities
Number of properties | property			34
Loss on asset impairment			$ 167,100
Disposition Plan | Carrying Amount | Nonrecurring
Fair value of assets and liabilities
Real estate properties, net			581,700
Previously reported
Fair value of assets and liabilities
Loss on asset impairment			4,800
General and administrative expense
Fair value of assets and liabilities
Change in fair value of derivatives		$ 9,000
Minimum
Fair value of assets and liabilities
Average closing price per common share during one year period after date (in dollars per share) | $ / shares				$ 26.00
Average closing price per common share during first and second year after date (in dollars per share) | $ / shares				$ 26.00
Related/Corvex
Fair value of assets and liabilities
Amount of reimbursements payable to related party if specified minimum common share price maintain during the one year period after the date on which the reimbursement is approved by shareholders				$ 8,400
Amount of reimbursements payable to related party if specified minimum common share price maintain during the one year period between the first and second anniversaries of the date on which the reimbursement is approved by shareholders				$ 8,400
Amount of reimbursements payable to related party upon the approval of shareholders	$ 8,400		$ 16,700

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Fair Value of Assets and Liabilities - Schedule of Valuation Techniques and Significant Unobservable Inputs Used for Level 3 Fair Value Measurements (Details) - Level 3 - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Real estate properties held for sale | Discounted cash flows
Fair Value of Assets and Liabilities
Fair value of assets			$ 414,625
Discount rate			10.20%
Exit capitalization rate			9.10%
Property, plant and equipment | Discounted cash flows
Fair Value of Assets and Liabilities
Fair value of assets	$ 19,589
Discount rate	8.00%
Exit capitalization rate	8.00%
Derivative liability
Fair Value of Assets and Liabilities
Fair value of liabilities		$ 7,219	$ 6,658
Risk-free rate		0.52%	0.50%
Volatility		20.00%	20.00%

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Fair Value of Assets and Liabilities - Schedule of Fair Value and Carrying Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Carrying Amount
Fair value of financial instruments
Senior unsecured debt and mortgage notes payable, net	$ 1,710,324	$ 2,207,665
Fair Value
Fair value of financial instruments
Senior unsecured debt and mortgage notes payable, net	$ 1,749,211	$ 2,263,535

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Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator for earnings per common share - basic and diluted:
Income (loss) from continuing operations									$ 99,857	$ 21,206	$ (37,318)
Net income attributable to noncontrolling interest in consolidated subsidiary									0	0	(20,093)
Preferred distributions									(27,924)	(32,095)	(44,604)
Excess fair value of consideration over carrying value of preferred shares									0	(16,205)	0
Income (loss) from continuing operations attributable to Equity Commonwealth common shareholders									71,933	(27,094)	(102,015)
Discontinued operations									0	2,806	(119,649)
Numerator for net income (loss) per share - basic and diluted	$ 36,164	$ 23,485	$ 5,635	$ 6,649	$ (165,542)	$ 149,759	$ (17,802)	$ 9,297	$ 71,933	$ (24,288)	$ (221,664)
Denominator for earnings per common share - basic and diluted:
Weighted average common shares outstanding — basic (in shares)									128,621	125,163	112,378
Weighted average common shares outstanding — diluted (in shares)									129,437	125,163	112,378
Earnings per share - basic:
Income from continuing operations attributable to Equity Commonwealth common shareholders (in dollars per share)									$ 0.56	$ (0.21)	$ (0.91)
Discontinued operations (in dollars per share)									0.00	0.02	(1.06)
Net income (loss) (in dollars per share)	$ 0.29	$ 0.18	$ 0.04	$ 0.05	$ (1.28)	$ 1.16	$ (0.14)	$ 0.08	0.56	(0.19)	(1.97)
Earnings per share - diluted:
Income from continuing operations attributable to Equity Commonwealth common shareholders (in dollars per share)									0.56	(0.21)	(0.91)
Discontinued operations (in dollars per share)									0.00	0.02	(1.06)
Net income (loss) (in dollars per share)	$ 0.28	$ 0.18	$ 0.04	$ 0.05	$ (1.28)	$ 1.16	$ (0.14)	$ 0.08	$ 0.56	$ (0.19)	$ (1.97)
Effect of Series D preferred shares; 6 1/2% cumulative convertible
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Preferred shares, dividend yield									6.50%	6.50%	6.50%
Anti-dilutive securities:
Anti-dilutive securities (in shares)									2,363	4,175	7,298
Effect of Series D preferred shares; 6 1/2% cumulative convertible
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Preferred shares, dividend yield									6.50%	6.50%

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Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Footnote) (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
RSUs vested (in shares)		134,914	66,639
Restricted stock units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
RSUs vested (in shares)	0	0
Common shares issued (in shares)	1,143,000	0
Weighted average common shares outstanding — diluted (in shares)	816,000

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Segment Information - Narrative (Details)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Percentage of CBD and suburban properties that are office properties (more than)	90.00%

XML

Related Person Transactions - Narrative (Details)																					1 Months Ended				3 Months Ended	5 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Jul. 20, 2015 USD ($) option	Jun. 16, 2015 shares	May. 04, 2015 USD ($)	Mar. 01, 2015 USD ($)	Jan. 28, 2015 shares	Dec. 31, 2014 USD ($) ft² property	Sep. 30, 2014 USD ($) trustee	Sep. 29, 2014 trustee agreement	Jul. 31, 2014 USD ($) option $ / shares	Jul. 09, 2014 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) ft² shares	Jun. 01, 2014 USD ($) option parking_space	May. 09, 2014 USD ($) company shares	Mar. 01, 2014 property	Dec. 19, 2013 USD ($)	Jul. 02, 2013 shares	Mar. 15, 2013 USD ($) shares	Mar. 12, 2012 shares	Feb. 29, 2012	Feb. 16, 2012 USD ($) ft² building property shares	Jan. 31, 2016 USD ($)	Aug. 31, 2015 USD ($)	Jan. 31, 2013 USD ($)	Mar. 31, 2012 USD ($) shares	Jun. 30, 2014 ft² office shares	Feb. 28, 2015 USD ($)	Jun. 30, 2014 USD ($) ft² shares	Sep. 30, 2014 USD ($)	Dec. 31, 2015 shares	Dec. 31, 2014 USD ($) ft² property trustee installment shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2009	May. 31, 2014 USD ($)	May. 08, 2014	Mar. 31, 2014 ft²	Jul. 01, 2013 shares	Mar. 31, 2013 USD ($)
Related Party Transaction [Line Items]
Property square feet | ft²						5,600,000																								5,600,000					5,641,450
Number of equity awards granted (in shares) | shares																														4,000	83,450
Number of properties | property						31																								31
Incentive management fee vesting on the date of issuance, percent															33.33%
Incentive management fee vesting one year from the date of issuance, percent															33.34%
Incentive management fee vesting in two years from the date of issuance, percent															33.33%
Twenty Percent on Grant Date
Related Party Transaction [Line Items]
Vesting percent																													20.00%
Twenty Percent in Year One
Related Party Transaction [Line Items]
Vesting percent																													20.00%
Twenty Percent in Year Two
Related Party Transaction [Line Items]
Vesting percent																													20.00%
Twenty Percent in Year Three
Related Party Transaction [Line Items]
Vesting percent																													20.00%
Twenty Percent in Year Four
Related Party Transaction [Line Items]
Vesting percent																													20.00%
SIR
Related Party Transaction [Line Items]
Amount of reimbursements payable to related party																																					$ 600,000
Number of former independent trustees | trustee																														1
Property square feet | ft²																				21,400,000
Prior ownership percentage																		100.00%	100.00%
Shares sold (in shares) | shares																10,500,000		9,200,000						9,200,000
Less than wholly owned subsidiary, common shares owned (in shares) | shares										22,000,000	22,000,000														22,000,000		22,000,000									22,000,000
Ownership Percentage										0.00%	36.70%					44.20%									36.70%		36.70%
Proceeds from IPO																								$ 180,800,000
Repayment of promissory note																				$ 400,000,000
Common shares consideration received on transfer of properties (in shares) | shares																				22,000,000
Number of properties sold or transferred or agreed to be sold or transferred | property																				79
Number of separate buildings or land parcels sold or transferred or agreed to be sold or transferred | building																				251
Equity investments, number of shares sold (in shares) | shares										22,000,000
Price per common share (in dollars per share) | $ / shares										$ 32.04
Equity investments, proceeds from sale										$ 704,800,000
Parent Company
Related Party Transaction [Line Items]
Number of properties | property														1
Amended Agreement
Related Party Transaction [Line Items]
Base business management fee payable in common shares (as a percent)											10.00%														10.00%		10.00%
Restricted shares
Related Party Transaction [Line Items]
Number of equity awards granted (in shares) | shares		34,587			126,319																								160,906	713,727
Number of anniversaries of the grant date for vesting of restricted shares		1 year			4 years
Minimum
Related Party Transaction [Line Items]
Price per common share during one year period after date (in dollars per share) | $ / shares									$ 26.00
Price per common share during first and second year after date (in dollars per share) | $ / shares									$ 26.00
Maximum
Related Party Transaction [Line Items]
Ownership Percentage																													50.00%
Equity Group Investments and associated entities
Related Party Transaction [Line Items]
Initial term	$ 500,000								$ 200,000			$ 200,000
Lease term	5 years								7 months			1 year
Number of renewal options | option	1								1			1
Renewal option term	5 years								3 months			3 months
Lease payment	$ 800,000		$ 200,000
License agreement term												1 year
License fee			$ 100,000									$ 200,000
Number of parking spaces | parking_space												1
Equity Group Investments and associated entities | Subsequent event
Related Party Transaction [Line Items]
Lease payment																					$ 100,000
License fee																					$ 100,000
Related/Corvex
Related Party Transaction [Line Items]
Amount of reimbursements payable to related party									$ 33,500,000
Reimbursement amount paid																						$ 8,400,000								$ 16,700,000
Amount of reimbursements payable to related party if specified minimum common share price maintain during the one year period after the date on which the reimbursement is approved by shareholders									8,400,000
Amount of reimbursements payable to related party if specified minimum common share price maintain during the one year period between the first and second anniversaries of the date on which the reimbursement is approved by shareholders									$ 8,400,000
RMR
Related Party Transaction [Line Items]
Lease term																									3 years
Number of agreements | agreement								3
Number of former managing trustees | trustee								1
Number of former independent trustees | trustee							2
Base management fee payable as a percentage of average historical cost of real estate investments, located outside the United States, Puerto Rico and Canada																															1.00%
Business management fees																											$ 31,700,000
Shares issued (in shares) | shares																											68,206
Base management fee payable as a percentage of average historical cost of real estate investments, located in the United States, Puerto Rico and Canada																															0.70%
Annual business management fee as a percentage of aggregate cost of properties acquired in excess of $250,000																															0.50%
Incentive fee as a percentage of the product of weighted average common shares outstanding on a fully diluted basis and the excess, if any of the Normalized FFO per share for current fiscal year over the preceding fiscal year																															15.00%
Incentive fees paid																															$ 0
Property management fees as a percentage of gross collected rents											3.00%														3.00%		3.00%
Construction supervision fees as a percentage of construction costs											5.00%														5.00%		5.00%
Property management and construction supervision fees																											$ 13,800,000
Payments to MacArthur Cook Fund Management Limited																							$ 200,000
Number of regional offices leased | office																									11
Rental income earned																											$ 400,000				800,000
Property square feet | ft²											36,500														36,500		36,500
Legal fees and costs																											$ 5,400,000				30,400,000
Number of properties | property														2
Total rent due						$ 1,100,000																								$ 1,100,000
RMR | SIR
Related Party Transaction [Line Items]
Business management fees																															43,300,000
Property management and construction supervision fees																															32,500,000
Pro rata share of related party's costs of providing internal audit function																															$ 300,000
RMR | Parent Company
Related Party Transaction [Line Items]
Number of properties acquired or agreed to be acquired | property														1
RMR | Amended Agreement
Related Party Transaction [Line Items]
Base management fee payable as a percentage of average historical cost of real estate investments, up to specified amount															0.70%
Base management fee payable as a percentage of average historical cost of real estate investments, located outside the United States, Puerto Rico and Canada															1.00%
Base management fee payable as a percentage of average historical cost of real estate investments, exceeding specified amount															0.50%
Base management fee payable as a percentage of average closing price per share of common shares on NYSE															0.70%
Base management fee payable as a percentage of average market capitalization exceeding specified amount															0.50%
Base business management fee payable in cash (as a percent)															90.00%
Base business management fee payable in common shares (as a percent)															10.00%
Minimum ownership of outstanding common shares of related party required to engage the same manager or common managing trustees															10.00%
Related Party Transaction Percentage for Limitation and Adjustments of Incentive Management Fee Payable															12.00%
Measurement period of incentive management fee															3 years
RMR | Restricted shares
Related Party Transaction [Line Items]
Number of equity awards granted (in shares) | shares																															73,450
Aggregate value of restricted shares granted																															$ 1,700,000
Number of anniversaries of the grant date for vesting of restricted shares																									4 years
RMR | 2014 | Amended Agreement
Related Party Transaction [Line Items]
Measurement period of incentive management fee																														1 year
RMR | 2015 | Amended Agreement
Related Party Transaction [Line Items]
Measurement period of incentive management fee																													2 years
RMR | Maximum
Related Party Transaction [Line Items]
Threshold amount of real estate investments for payment of base management fee																															250,000,000
RMR | Maximum | Amended Agreement
Related Party Transaction [Line Items]
Threshold amount of real estate investments for payment of base management fee															$ 250,000,000
Base management fee payable, average market capitalization															$ 250,000,000
RMR Australia
Related Party Transaction [Line Items]
Property management fees as a percentage of gross collected rents											3.00%														3.00%		3.00%
Construction supervision fees as a percentage of construction costs											5.00%														5.00%		5.00%
Compensation for business management and real estate investment services as a percentage of average historical cost of CWHAT's real estate investments											0.50%														0.50%		0.50%
Compensation for property management services as a percentage of difference between 3.5% of collected gross rents and the aggregate of all amounts paid or payable by or on behalf of CWHAT to third party property managers											50.00%														50.00%		50.00%
Compensation for construction supervision services as a percentage of difference between 5.0% of construction costs and any amounts paid to third parties for construction management and/or supervision											50.00%														50.00%		50.00%
Business and property management fees																											$ 900,000				1,600,000
RMR and RMR Australia
Related Party Transaction [Line Items]
Monthly management fees				$ 100,000																						$ 1,200,000
Pro rata portion of the current year's incentive fee under the existing business management agreement																												$ 15,300,000
GOV
Related Party Transaction [Line Items]
Amount of reimbursements payable to related party																															$ 300,000
Prior ownership percentage																																100.00%
Shares sold (in shares) | shares																	9,950,000
Net proceeds received on issuance or sale of common shares																	$ 239,600,000
Realized gain on sale of common shares																	$ 66,300,000
AIC
Related Party Transaction [Line Items]
Ownership Percentage													0.00%																					12.50%
Equity investments, number of shares sold (in shares) | shares													20,000
Equity investments, proceeds from sale													$ 5,800,000
Amount invested in equity investee													$ 5,200,000
Number of other companies which are shareholders of related party | company													4
Coverage amount for property insurance																																	$ 500,000,000.0
Premium for property insurance																											$ 6,000,000
Equity Commonwealth and REIT Management and Research LLC
Related Party Transaction [Line Items]
Settlement receivable						12,000,000																								$ 12,000,000
Number of settlement receivable installments | installment																														3
Settlement receivable installment amount						3,000,000	$ 3,000,000				$ 6,000,000
Equity Commonwealth
Related Party Transaction [Line Items]
Total rent due						$ 9,200,000																								$ 9,200,000

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Selected Quarterly Financial Data - Summary of Unaudited Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Jan. 31, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenues		$ 138,934	$ 159,208	$ 203,694	$ 213,055	$ 212,808	$ 216,595	$ 215,194	$ 217,260	$ 714,891	$ 861,857	$ 953,029
Net income attributable to Equity Commonwealth common shareholders		$ 36,164	$ 23,485	$ 5,635	$ 6,649	$ (165,542)	$ 149,759	$ (17,802)	$ 9,297	$ 71,933	$ (24,288)	$ (221,664)
Net income attributable to Equity Commonwealth common shareholders per share—basic		$ 0.29	$ 0.18	$ 0.04	$ 0.05	$ (1.28)	$ 1.16	$ (0.14)	$ 0.08	$ 0.56	$ (0.19)	$ (1.97)
Net income attributable to Equity Commonwealth common shareholders per share—diluted		$ 0.28	$ 0.18	$ 0.04	$ 0.05	(1.28)	1.16	(0.14)	0.08	$ 0.56	$ (0.19)	$ (1.97)
Common distributions declared	$ 0.25					$ 0	$ 0	$ 0	$ 0.25

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Selected Quarterly Financial Data - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
	Jul. 09, 2014	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Loss on asset impairment		$ 167,100		$ 22,700	$ 17,162	$ 185,067	$ 124,253
Gain on sale of equity investment					$ 0	$ 171,561	$ 66,293
SIR
Schedule of Equity Method Investments [Line Items]
Gain on sale of equity investment	$ 171,800		$ 171,800

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Subsequent Events - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended		2 Months Ended	12 Months Ended
	Feb. 16, 2016 USD ($) $ / shares	Feb. 18, 2016 USD ($) ft² building	Jan. 31, 2013 building	Feb. 16, 2016 $ / shares shares	Dec. 31, 2015 ft² building property $ / shares shares	Dec. 31, 2014 ft²	Mar. 31, 2014 ft²
Subsequent Event [Line Items]
Number of buildings sold | building			18
Property square feet | ft²						5,600,000	5,641,450
6.25% Senior Unsecured Notes due 2016
Subsequent Event [Line Items]
Interest rate stated percentage					6.25%
Disposed of by Sale
Subsequent Event [Line Items]
Number of properties sold or agreed to be sold | property					91
Number of buildings sold | building					135
Property square feet | ft²					18,939,185
Subsequent event
Subsequent Event [Line Items]
Interest rate stated percentage	6.25%			6.25%
Redemption of shares (in shares) | shares				861,162
Subsequent event | Disposed of by Sale
Subsequent Event [Line Items]
Number of buildings sold | building		9
Property square feet | ft²		427,443
Gross proceeds from sale of real estate anticipated | $		$ 50.9
Senior Notes | Subsequent event | 6.25% Senior Unsecured Notes due 2016
Subsequent Event [Line Items]
Repayments of debt | $	$ 139.1
Common Stock
Subsequent Event [Line Items]
Redemption of shares (in shares) | shares					3,410,300
Treasury Stock Acquired, Average Cost Per Share | $ / shares					$ 25.76
Common Stock | Subsequent event
Subsequent Event [Line Items]
Treasury Stock Acquired, Average Cost Per Share | $ / shares	$ 25.94			$ 25.94

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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in valuation and qualifying accounts
Balance at Beginning of Period	$ 6,565	$ 7,885	$ 9,962
Charged to Costs and Expenses	4,533	2,196	818
Deductions	(3,383)	(3,516)	(2,895)
Balance at End of Period	$ 7,715	$ 6,565	$ 7,885

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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 247,562
Initial Cost to Company
Land	394,913
Buildings and Improvements	3,065,229
Costs Capitalized Subsequent to Acquisition, Net	540,382
Impairment/Write Downs	(113,172)
Cost Amount Carried at Close of Period
Land	389,410
Buildings and Improvements	3,497,942
Total	3,887,352	$ 5,728,443	$ 5,537,165	$ 7,829,409
Accumulated Depreciation	898,939	$ 1,030,445	$ 895,059	$ 1,007,606
785 Schilinger Road South, Mobile, AL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,540
Buildings and Improvements	9,732
Costs Capitalized Subsequent to Acquisition, Net	(3)
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,540
Buildings and Improvements	9,729
Total	11,269
Accumulated Depreciation	1,990
Parkshore Plaza, Folsom, CA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	41,275
Initial Cost to Company
Land	4,370
Buildings and Improvements	41,749
Costs Capitalized Subsequent to Acquisition, Net	3,063
Impairment/Write Downs	(3)
Cost Amount Carried at Close of Period
Land	4,370
Buildings and Improvements	44,809
Total	49,179
Accumulated Depreciation	5,086
Leased Land, Gonzalez, CA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	18,941
Buildings and Improvements	9,060
Costs Capitalized Subsequent to Acquisition, Net	3,967
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	18,940
Buildings and Improvements	13,028
Total	31,968
Accumulated Depreciation	2,862
Sky Park Centre, San Diego, CA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	936
Buildings and Improvements	8,094
Costs Capitalized Subsequent to Acquisition, Net	756
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	936
Buildings and Improvements	8,850
Total	9,786
Accumulated Depreciation	3,308
9110 East Nichols Avenue, Centennial, CO
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,708
Buildings and Improvements	14,616
Costs Capitalized Subsequent to Acquisition, Net	4,002
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,708
Buildings and Improvements	18,618
Total	20,326
Accumulated Depreciation	6,438
1225 Seventeenth Street, Denver, CO
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	22,400
Buildings and Improvements	110,090
Costs Capitalized Subsequent to Acquisition, Net	17,269
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	22,400
Buildings and Improvements	127,359
Total	149,759
Accumulated Depreciation	21,595
5073, 5075, & 5085 S. Syracuse Street, Denver, CO
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	4,720
Buildings and Improvements	58,890
Costs Capitalized Subsequent to Acquisition, Net	0
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	4,720
Buildings and Improvements	58,890
Total	63,610
Accumulated Depreciation	8,343
1601 Dry Creek Drive, Longmont, CO
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	3,714
Buildings and Improvements	24,397
Costs Capitalized Subsequent to Acquisition, Net	5,535
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	3,715
Buildings and Improvements	29,931
Total	33,646
Accumulated Depreciation	9,165
97 Newberry Road, East Windsor, CT
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,375
Initial Cost to Company
Land	2,960
Buildings and Improvements	12,360
Costs Capitalized Subsequent to Acquisition, Net	30
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	2,943
Buildings and Improvements	12,407
Total	15,350
Accumulated Depreciation	2,865
33 Stiles Lane, North Haven, CT
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	2,785
Initial Cost to Company
Land	2,090
Buildings and Improvements	9,141
Costs Capitalized Subsequent to Acquisition, Net	216
Impairment/Write Downs	(1,654)
Cost Amount Carried at Close of Period
Land	1,799
Buildings and Improvements	7,994
Total	9,793
Accumulated Depreciation	2,161
1250 H Street, NW, Washington, DC
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	5,975
Buildings and Improvements	53,778
Costs Capitalized Subsequent to Acquisition, Net	10,947
Impairment/Write Downs	(2)
Cost Amount Carried at Close of Period
Land	5,975
Buildings and Improvements	64,723
Total	70,698
Accumulated Depreciation	26,030
Georgetown-Green and Harris Buildings, Washington, DC
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	24,000
Buildings and Improvements	35,979
Costs Capitalized Subsequent to Acquisition, Net	44
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	24,000
Buildings and Improvements	36,023
Total	60,023
Accumulated Depreciation	5,700
802 Delaware Avenue, Wilmington, DE
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	4,409
Buildings and Improvements	39,681
Costs Capitalized Subsequent to Acquisition, Net	10,533
Impairment/Write Downs	(11,156)
Cost Amount Carried at Close of Period
Land	3,390
Buildings and Improvements	40,077
Total	43,467
Accumulated Depreciation	23,091
6600 North Military Trail, Boca Raton, FL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	15,900
Buildings and Improvements	129,790
Costs Capitalized Subsequent to Acquisition, Net	123
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	15,900
Buildings and Improvements	129,913
Total	145,813
Accumulated Depreciation	16,224
Executive Park, Atlanta, GA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	13,729
Buildings and Improvements	78,032
Costs Capitalized Subsequent to Acquisition, Net	6,776
Impairment/Write Downs	(54,313)
Cost Amount Carried at Close of Period
Land	10,954
Buildings and Improvements	33,270
Total	44,224
Accumulated Depreciation	14,859
633 Ahua Street, Honolulu, HI
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,256
Buildings and Improvements	3
Costs Capitalized Subsequent to Acquisition, Net	18,054
Impairment/Write Downs	(2,912)
Cost Amount Carried at Close of Period
Land	1,100
Buildings and Improvements	15,301
Total	16,401
Accumulated Depreciation	3,765
625 Crane Street, Aurora, IL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,180
Buildings and Improvements	3,411
Costs Capitalized Subsequent to Acquisition, Net	(2)
Impairment/Write Downs	(2,978)
Cost Amount Carried at Close of Period
Land	533
Buildings and Improvements	1,078
Total	1,611
Accumulated Depreciation	87
1200 Lakeside Drive, Bannockburn, IL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	5,846
Buildings and Improvements	48,568
Costs Capitalized Subsequent to Acquisition, Net	14,768
Impairment/Write Downs	(7,610)
Cost Amount Carried at Close of Period
Land	5,858
Buildings and Improvements	55,714
Total	61,572
Accumulated Depreciation	12,601
600 West Chicago Avenue, Chicago, IL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	34,980
Buildings and Improvements	315,643
Costs Capitalized Subsequent to Acquisition, Net	12,058
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	34,980
Buildings and Improvements	327,701
Total	362,681
Accumulated Depreciation	35,679
8750 Bryn Mawr Avenue, Chicago, IL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	6,600
Buildings and Improvements	77,764
Costs Capitalized Subsequent to Acquisition, Net	7,400
Impairment/Write Downs	(170)
Cost Amount Carried at Close of Period
Land	6,600
Buildings and Improvements	84,994
Total	91,594
Accumulated Depreciation	11,705
101-115 W. Washington Street, Indianapolis, IN
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	7,495
Buildings and Improvements	60,465
Costs Capitalized Subsequent to Acquisition, Net	23,210
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	7,496
Buildings and Improvements	83,674
Total	91,170
Accumulated Depreciation	23,976
111 Monument Circle, Indianapolis, IN
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	9,670
Buildings and Improvements	158,085
Costs Capitalized Subsequent to Acquisition, Net	8,556
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	9,670
Buildings and Improvements	166,641
Total	176,311
Accumulated Depreciation	13,115
109 Brookline Avenue, Boston, MA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	3,168
Buildings and Improvements	30,397
Costs Capitalized Subsequent to Acquisition, Net	12,684
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	3,168
Buildings and Improvements	43,081
Total	46,249
Accumulated Depreciation	18,718
Cabot Business Park Land, Mansfield, MA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,033
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition, Net	0
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,033
Buildings and Improvements	0
Total	1,033
Accumulated Depreciation	0
111 Market Place, Baltimore, MD
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	6,328
Buildings and Improvements	54,645
Costs Capitalized Subsequent to Acquisition, Net	16,152
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	6,328
Buildings and Improvements	70,797
Total	77,125
Accumulated Depreciation	24,753
25 S. Charles Street, Baltimore, MD
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	2,830
Buildings and Improvements	22,996
Costs Capitalized Subsequent to Acquisition, Net	12,678
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	2,830
Buildings and Improvements	35,674
Total	38,504
Accumulated Depreciation	12,479
820 W. Diamond, Gaithersburg, MD
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	4,381
Buildings and Improvements	18,798
Costs Capitalized Subsequent to Acquisition, Net	10,538
Impairment/Write Downs	(35)
Cost Amount Carried at Close of Period
Land	4,461
Buildings and Improvements	29,221
Total	33,682
Accumulated Depreciation	11,487
Danac Stiles Business Park, Rockville, MD
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	7,638
Buildings and Improvements	62,572
Costs Capitalized Subsequent to Acquisition, Net	6,329
Impairment/Write Downs	(10,975)
Cost Amount Carried at Close of Period
Land	6,595
Buildings and Improvements	58,969
Total	65,564
Accumulated Depreciation	18,984
East Eisenhower Parkway, Ann Arbor, MI
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	6,760
Buildings and Improvements	46,988
Costs Capitalized Subsequent to Acquisition, Net	1,513
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	6,760
Buildings and Improvements	48,501
Total	55,261
Accumulated Depreciation	6,836
2250 Pilot Knob Road, Mendota Heights, MN
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	533
Buildings and Improvements	4,795
Costs Capitalized Subsequent to Acquisition, Net	1,202
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	533
Buildings and Improvements	5,997
Total	6,530
Accumulated Depreciation	2,643
411 Farwell Avenue, South St. Paul, MN
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,303
Buildings and Improvements	10,451
Costs Capitalized Subsequent to Acquisition, Net	4,603
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,304
Buildings and Improvements	15,053
Total	16,357
Accumulated Depreciation	3,526
6200 Glenn Carlson Drive, St. Cloud, MN
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,950
Buildings and Improvements	13,803
Costs Capitalized Subsequent to Acquisition, Net	0
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,950
Buildings and Improvements	13,803
Total	15,753
Accumulated Depreciation	2,156
4700 Belleview Avenue, Kansas City, MO
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,165
Buildings and Improvements	3,097
Costs Capitalized Subsequent to Acquisition, Net	2,895
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,165
Buildings and Improvements	5,992
Total	7,157
Accumulated Depreciation	1,029
111 River Street, Hoboken, NJ
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	0
Buildings and Improvements	134,199
Costs Capitalized Subsequent to Acquisition, Net	1,871
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	0
Buildings and Improvements	136,070
Total	136,070
Accumulated Depreciation	21,630
North Point Office Complex, Cleveland, OH
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	12,000
Buildings and Improvements	94,448
Costs Capitalized Subsequent to Acquisition, Net	18,136
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	12,000
Buildings and Improvements	112,584
Total	124,584
Accumulated Depreciation	22,363
Raintree Industrial Park, Solon, OH
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,808
Buildings and Improvements	16,620
Costs Capitalized Subsequent to Acquisition, Net	2,270
Impairment/Write Downs	(8,387)
Cost Amount Carried at Close of Period
Land	1,339
Buildings and Improvements	10,972
Total	12,311
Accumulated Depreciation	858
401 Vine Street, Delmont, PA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,575
Buildings and Improvements	5,542
Costs Capitalized Subsequent to Acquisition, Net	0
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,575
Buildings and Improvements	5,542
Total	7,117
Accumulated Depreciation	1,130
Cherrington Corporate Center Moon, Township, PA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	11,369
Buildings and Improvements	39,892
Costs Capitalized Subsequent to Acquisition, Net	28,367
Impairment/Write Downs	(5,454)
Cost Amount Carried at Close of Period
Land	11,164
Buildings and Improvements	63,010
Total	74,174
Accumulated Depreciation	21,480
1500 Market Street, Philadelphia, PA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	18,758
Buildings and Improvements	167,487
Costs Capitalized Subsequent to Acquisition, Net	104,542
Impairment/Write Downs	(388)
Cost Amount Carried at Close of Period
Land	18,758
Buildings and Improvements	271,641
Total	290,399
Accumulated Depreciation	78,551
1525 Locust Street, Philadelphia, PA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	931
Buildings and Improvements	8,377
Costs Capitalized Subsequent to Acquisition, Net	1,902
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	930
Buildings and Improvements	10,280
Total	11,210
Accumulated Depreciation	4,122
1600 Market Street, Philadelphia, PA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	3,462
Buildings and Improvements	111,946
Costs Capitalized Subsequent to Acquisition, Net	18,259
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	3,462
Buildings and Improvements	130,205
Total	133,667
Accumulated Depreciation	55,534
1735 Market Street, Philadelphia, PA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	169,612
Initial Cost to Company
Land	24,753
Buildings and Improvements	222,775
Costs Capitalized Subsequent to Acquisition, Net	52,107
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	24,747
Buildings and Improvements	274,888
Total	299,635
Accumulated Depreciation	121,238
Foster Plaza, Pittsburgh, PA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	6,168
Buildings and Improvements	51,588
Costs Capitalized Subsequent to Acquisition, Net	17,969
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	6,171
Buildings and Improvements	69,554
Total	75,725
Accumulated Depreciation	19,771
128 Crews Drive, Columbia, SC
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	2,420
Buildings and Improvements	4,017
Costs Capitalized Subsequent to Acquisition, Net	1,322
Impairment/Write Downs	(4,012)
Cost Amount Carried at Close of Period
Land	1,024
Buildings and Improvements	2,723
Total	3,747
Accumulated Depreciation	489
111 Southchase Boulevard, Fountain Inn, SC
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	520
Buildings and Improvements	6,822
Costs Capitalized Subsequent to Acquisition, Net	1,734
Impairment/Write Downs	(2,912)
Cost Amount Carried at Close of Period
Land	390
Buildings and Improvements	5,774
Total	6,164
Accumulated Depreciation	1,531
1043 Global Avenue, Graniteville, SC
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	720
Buildings and Improvements	15,552
Costs Capitalized Subsequent to Acquisition, Net	603
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	720
Buildings and Improvements	16,155
Total	16,875
Accumulated Depreciation	3,537
633 Frazier Drive, Franklin, TN
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	5,800
Buildings and Improvements	13,190
Costs Capitalized Subsequent to Acquisition, Net	(10)
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	5,800
Buildings and Improvements	13,180
Total	18,980
Accumulated Depreciation	2,711
1601 Rio Grande Street, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	688
Buildings and Improvements	6,192
Costs Capitalized Subsequent to Acquisition, Net	1,539
Impairment/Write Downs	(23)
Cost Amount Carried at Close of Period
Land	697
Buildings and Improvements	7,699
Total	8,396
Accumulated Depreciation	3,106
206 East 9th Street, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	27,515
Initial Cost to Company
Land	7,900
Buildings and Improvements	38,533
Costs Capitalized Subsequent to Acquisition, Net	2,166
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	7,900
Buildings and Improvements	40,699
Total	48,599
Accumulated Depreciation	3,702
4515 Seton Center Parkway, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	2,038
Buildings and Improvements	18,338
Costs Capitalized Subsequent to Acquisition, Net	2,731
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	2,037
Buildings and Improvements	21,070
Total	23,107
Accumulated Depreciation	9,110
4516 Seton Center Parkway, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	2,028
Buildings and Improvements	18,251
Costs Capitalized Subsequent to Acquisition, Net	3,022
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	2,027
Buildings and Improvements	21,274
Total	23,301
Accumulated Depreciation	9,681
7800 Shoal Creek Boulevard, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,731
Buildings and Improvements	14,921
Costs Capitalized Subsequent to Acquisition, Net	4,614
Impairment/Write Downs	(14)
Cost Amount Carried at Close of Period
Land	1,731
Buildings and Improvements	19,521
Total	21,252
Accumulated Depreciation	7,672
812 San Antonio Street, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	626
Buildings and Improvements	5,636
Costs Capitalized Subsequent to Acquisition, Net	2,564
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	621
Buildings and Improvements	8,205
Total	8,826
Accumulated Depreciation	3,115
8701 N. Mopac, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,574
Buildings and Improvements	14,168
Costs Capitalized Subsequent to Acquisition, Net	2,677
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,573
Buildings and Improvements	16,846
Total	18,419
Accumulated Depreciation	6,751
Bridgepoint Parkway, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	7,784
Buildings and Improvements	70,526
Costs Capitalized Subsequent to Acquisition, Net	10,214
Impairment/Write Downs	(97)
Cost Amount Carried at Close of Period
Land	7,785
Buildings and Improvements	80,642
Total	88,427
Accumulated Depreciation	37,559
Lakewood on the Park, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	3,548
Buildings and Improvements	31,936
Costs Capitalized Subsequent to Acquisition, Net	1,704
Impairment/Write Downs	(77)
Cost Amount Carried at Close of Period
Land	3,548
Buildings and Improvements	33,563
Total	37,111
Accumulated Depreciation	14,554
Research Park, Austin, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	15,859
Buildings and Improvements	60,175
Costs Capitalized Subsequent to Acquisition, Net	14,601
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	18,411
Buildings and Improvements	72,224
Total	90,635
Accumulated Depreciation	29,564
9840 Gateway Boulevard North, El Paso, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,700
Buildings and Improvements	9,736
Costs Capitalized Subsequent to Acquisition, Net	(4)
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,700
Buildings and Improvements	9,732
Total	11,432
Accumulated Depreciation	1,996
3003 South Expressway 281, Hidalgo, TX
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,480
Buildings and Improvements	15,533
Costs Capitalized Subsequent to Acquisition, Net	(9)
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,480
Buildings and Improvements	15,524
Total	17,004
Accumulated Depreciation	3,193
3330 N Washington Boulevard, Arlington, VA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	810
Buildings and Improvements	7,289
Costs Capitalized Subsequent to Acquisition, Net	724
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	811
Buildings and Improvements	8,012
Total	8,823
Accumulated Depreciation	3,304
333 108th Avenue NE, Bellevue, WA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	14,400
Buildings and Improvements	136,412
Costs Capitalized Subsequent to Acquisition, Net	1,745
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	14,400
Buildings and Improvements	138,157
Total	152,557
Accumulated Depreciation	22,060
600 108th Avenue NE, Bellevue, WA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	3,555
Buildings and Improvements	30,244
Costs Capitalized Subsequent to Acquisition, Net	14,252
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	3,555
Buildings and Improvements	44,496
Total	48,051
Accumulated Depreciation	11,904
1331 North Center Parkway, Kennewick, WA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	1,850
Buildings and Improvements	7,339
Costs Capitalized Subsequent to Acquisition, Net	(2)
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	1,850
Buildings and Improvements	7,337
Total	9,187
Accumulated Depreciation	1,506
100 East Wisconsin Avenue, Milwaukee, WI
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	3,150
Buildings and Improvements	72,113
Costs Capitalized Subsequent to Acquisition, Net	7,733
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	3,150
Buildings and Improvements	79,846
Total	82,996
Accumulated Depreciation	11,433
111 East Kilbourn Avenue, Milwaukee, WI
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company
Land	2,400
Buildings and Improvements	47,562
Costs Capitalized Subsequent to Acquisition, Net	5,143
Impairment/Write Downs	0
Cost Amount Carried at Close of Period
Land	2,400
Buildings and Improvements	52,705
Total	55,105
Accumulated Depreciation	$ 10,528

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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Analysis of Carrying Amount of Real Estate Properties and Accumulated Depreciation (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate Properties
Balance at the beginning of the year			$ 5,728,443	$ 5,537,165	$ 7,829,409
Additions			68,118	70,963	231,485
Loss on asset impairment	$ (167,100)	$ (22,700)	(17,162)	(185,067)	(124,253)
Deconsolidation of SIR					(1,446,781)
Properties reclassified to discontinued operations					(552,024)
Properties reclassified to continuing operations				341,024
Disposals			(1,892,047)	(29,219)	(140,783)
Balance at the end of the year	5,728,443		3,887,352	5,728,443	5,537,165
Accumulated Depreciation
Balance at the beginning of the year			1,030,445	895,059	1,007,606
Additions			144,844	164,815	176,777
Loss on asset impairment			0	(6,423)	(185,795)
Deconsolidation of SIR					(56,023)
Properties reclassified to discontinued operations					(15,471)
Disposals			(276,350)	(28,730)	(32,035)
Properties reclassified to continuing operations				5,724
Balance at the end of the year	$ 1,030,445		$ 898,939	1,030,445	895,059
Real Estate
Real Estate Properties
Loss on asset impairment				$ (191,490)	$ (384,141)

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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Analysis of Carrying Amount of Real Estate Properties and Accumulated Depreciation (Footnote) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Aggregate cost of properties for federal income tax purposes	$ 4,160,805
Real estate properties additions due to changes in foreign currency exchange	(13,217)	$ (20,445)	$ (40,020)
Accumulated depreciation additions due to changes in foreign currency exchange	$ (887)	$ (1,279)	$ (1,528)
Maximum | Buildings and improvements
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Estimated useful lives	40 years
Maximum | Personal property
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Estimated useful lives	12 years

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SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE
Face Amount of Mortgage			$ 8,107
Carrying Amount of Mortgage			8,087
Principal Amount of Loans Subject to Delinquent Principal or Interest			0
Reconciliation of the carrying amount of mortgage loans at the beginning of the period:
Balance at the beginning of period	$ 8,107	$ 1,419
New mortgage loans		7,688
Collections of principal		(1,000)
Balance at the end of period	8,107	8,107
Balance at the end of period	$ 8,107	$ 1,419	8,107	$ 8,107
Salina, NY
SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE
Interest Rate	6.00%
Periodic Payment Terms				419
Face Amount of Mortgage			419
Carrying Amount of Mortgage			399
Principal Amount of Loans Subject to Delinquent Principal or Interest			0
Dearborn, MI
SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE
Interest Rate	6.00%
Periodic Payment Terms				$ 7,688
Face Amount of Mortgage			7,688
Carrying Amount of Mortgage			7,688
Principal Amount of Loans Subject to Delinquent Principal or Interest			$ 0