BASIS OF PRESENTATION. Our consolidated financial statements include the accounts of Diversified Healthcare Trust, we, us or our, and our subsidiaries, all of which, except for the joint venture discussed below, are 100% owned directly or indirectly by us. All intercompany transactions and balances with or among our consolidated subsidiaries have been eliminated. Accounting principles generally accepted in the United States, or GAAP, require 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. We have made reclassifications to the prior years' financial statements to conform to the current year's presentation. These reclassifications had no effect on net income (loss) or equity.

In March 2017, we entered a joint venture with a sovereign investor for one of our life science properties located in Boston, Massachusetts. We have determined that this joint venture is a variable interest entity, or VIE, as defined under the Consolidation Topic of the Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or the Codification. We concluded that we must consolidate this VIE because we are the entity with the power to direct the activities that most significantly impact the VIE's economic performance and we have the obligation to absorb losses of, and the right to receive benefits from, the VIE that could be significant to the VIE, and therefore are the primary beneficiary of the VIE. The assets of this VIE were $1,015,661 and $1,061,593 as of December 31, 2019 and 2018, respectively, and consist primarily of the net real estate owned by the joint venture. The liabilities of this VIE were $704,344 and $714,226 as of December 31, 2019 and 2018, respectively, and consist primarily of the secured debts on the property. The sovereign investor's interest in this consolidated entity is reflected as noncontrolling interest in our consolidated financial statements. See Note 10 for further information about this joint venture.

We allocate the purchase prices of our properties to land, building and improvements based on determinations of the fair values of these assets assuming the properties are vacant. We determine the fair value of each property using methods similar to those used by independent appraisers, which may involve estimated cash flows that are based on a number of factors, including capitalization rates and discount rates, among others. In some circumstances, we engage independent real estate appraisal firms to provide market information and evaluations which are relevant to our purchase price allocations and determinations of depreciable useful lives; however, we are ultimately responsible for the purchase price allocations and determinations of useful lives. We allocate a portion of the purchase price to above market and below market leases based on the present value (using an interest rate which reflects the risks associated with acquired in place leases at the time each property was acquired by us) of the difference, if any, between (i) the contractual amounts to be paid pursuant to the acquired in place leases and (ii) our estimates of fair market lease rates for the corresponding leases, measured over a period equal to the terms of the respective leases. The terms of below market leases that include bargain renewal options, if any, are further adjusted if we determine that renewal is probable. We allocate a portion of the purchase price to acquired in place leases and tenant relationships based upon market estimates to lease up the property based on the leases in place at the time of purchase. In making these allocations, we consider factors such as estimated carrying costs during the expected lease up periods, including real estate taxes, insurance and other operating income and expenses and costs, such as leasing commissions, legal and other related expenses, to execute similar leases in current market conditions at the time a property was acquired by us. We allocate this aggregate value between acquired in place lease values and tenant relationships based on our evaluation of the specific characteristics of each tenant's lease. However, we have not separated the value of tenant relationships from the value of acquired in place leases because such value and related amortization expense is immaterial to our consolidated financial statements. If the value of tenant relationships becomes material in the future, we may separately allocate those amounts and amortize the allocated amount over the estimated life of the relationships.

to rental income over the non-cancelable periods of the respective leases. For the years ended December 31, 2019, 2018 and 2017, such amortization resulted in a net increase in rental income of $6,791, $5,787 and $5,349, respectively. We amortize the value of 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. During the years ended December 31, 2019, 2018 and 2017, such amortization included in depreciation totaled $64,203, $72,925 and $72,035, respectively. If a lease is terminated prior to its stated expiration, the unamortized amount relating to that lease is written off.



	December 31,
	2019			2018
Acquired real estate leases:
Capitalized above market lease values	$	34,587		$	35,056
Less: accumulated amortization	(30,039		)	(27,375		)
Capitalized above market lease values, net	4,548			7,681

Lease origination value	642,158			656,163
Less: accumulated amortization	(308,831		)	(244,600		)
Lease origination value, net	333,327			411,563
Acquired real estate leases, net	$	337,875		$	419,244

Assumed real estate lease obligations:
Capitalized below market lease values	$	134,225		$	134,395
Less: accumulated amortization	(57,520		)	(48,091		)
Assumed real estate lease obligations, net	$	76,705		$	86,304

As of December 31, 2019, the weighted average amortization periods for capitalized above market lease values, lease origination value and capitalized below market lease values were 4.1 years, 8.2 years and 8.9 years, respectively. Future amortization of net intangible acquired real estate lease assets and liabilities to be recognized over the current terms of the associated leases as of December 31, 2019 are estimated to be $41,458 in 2020, $37,152 in 2021, $33,307 in 2022, $32,226 in 2023, $27,168 in 2024 and $89,859 thereafter.

INVESTMENTS IN EQUITY SECURITIES. We previously owned 2,637,408 shares of class A common stock of The RMR Group Inc., or RMR Inc., that we sold on July 1, 2019. Prior to July 1, 2019, our equity securities were recorded at fair value based on their quoted market price at the end of each reporting period. We classify the common shares we own of Five Star Senior Living Inc., or Five Star, as equity securities and carry them at fair value in investments of equity securities in our consolidated balance sheets. Effective January 1, 2018, changes in the fair value of our equity securities were recorded through earnings in accordance with FASB Accounting Standards Update, or ASU, No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. Prior to the adoption of ASU No. 2016-01, unrealized gains and losses were recorded as a component of cumulative other comprehensive income (loss) in shareholder's equity.

At December 31, 2018 and 2019, we owned 423,500 Five Star common shares, after giving effect to the one-for-ten reverse stock split effected by Five Star with respect to its common shares on September 30, 2019. Our adjusted cost basis for our Five Star common shares is $6,353. At December 31, 2019 and 2018, our investment in Five Star had a fair value of $1,571 and $2,033, respectively, including unrealized losses of $462 and $4,320, respectively. In performing our periodic evaluation of other than temporary impairment of our investment in Five Star for the year ended December 31, 2016, we determined, based on the length of time and the extent to which the market value of our Five Star investment was below our carrying value, that the decline in fair value was deemed to be other than temporary at December 31, 2016. Other than temporary impairment review of equity

securities is no longer applicable subsequent to the adoption of ASU No. 2016-01. Accordingly, we recorded a $2,795 loss on impairment to reduce the carrying value of our Five Star investment to its estimated fair value during the fourth quarter of 2016. We estimated fair value using the closing price of Five Star common shares as of December 31, 2016 ($2.70 per share). We recorded an additional loss on impairment of $5,082 to reduce the carrying value of our Five Star investment to its estimated fair value during the second quarter of 2017.

EQUITY METHOD INVESTMENTS. We account for our investment in Affiliates Insurance Company, or AIC, until AIC was dissolved as described in Note 7, using the equity method of accounting. Significant influence is present through common representation on our Board of Trustees and the board of directors of AIC until February 13, 2020. The Chair of our Board of Trustees and one of our Managing Trustees, Adam D. Portnoy, as the sole trustee of ABP Trust, is the controlling shareholder of RMR Inc. He is also a managing director and an executive officer of RMR Inc. Substantially all of the business of RMR Inc. is conducted by its majority owned subsidiary, The RMR Group LLC, or RMR LLC, which is our manager and provided management and administrative services to AIC. Most of our Trustees were directors of AIC. See Note 7 for more information about our investment in AIC.

We periodically evaluate our equity method investments for possible indicators of other than temporary impairment whenever events or changes in circumstances indicate the carrying amount of the investment might not be recoverable. These indicators may include the length of time and the extent to which the market value of our investment is below our carrying value, the financial condition of our investees, our intent and ability to be a long term holder of the investment and other considerations. If the decline in fair value is judged to be other than temporary, we record an impairment charge to adjust the basis of the investment to its estimated fair value.

DEBT ISSUANCE COSTS. Debt issuance costs include issuance or assumption costs related to borrowings and we amortize those costs as interest expense over the terms of the respective loans. Debt issuance costs for our unsecured revolving credit facility totaled $17,170 at December 31, 2019 and 2018, and accumulated amortization of debt issuance costs totaled $13,944 and $12,364 at December 31, 2019 and 2018, respectively, and are included in other assets in our consolidated balance sheets. Debt issuance costs for our unsecured term loans, senior notes, and mortgage notes payable totaled $41,452 and $44,117 at December 31, 2019 and 2018, respectively, and accumulated amortization of debt issuance costs totaled $16,887 and $16,665, respectively, and are presented in our balance sheet as a direct deduction from the associated debt liability. Future amortization of debt issuance costs to be recognized with respect to our loans as of December 31, 2019 are estimated to be $4,271 in 2020, $3,791 in 2021, $1,949 in 2022, $1,632 in 2023, $1,499 in 2024 and $14,649 thereafter.

DEFERRED LEASING COSTS. Deferred leasing costs include capitalized brokerage and other fees associated with the successful negotiation of leases, which are amortized to depreciation and amortization expense on a straight line basis over the terms of the respective leases. Deferred leasing costs are included in other assets in our consolidated balance sheets. Deferred leasing costs totaled $42,014 and $35,145 at December 31, 2019 and 2018, respectively, and accumulated amortization of deferred leasing costs totaled $14,922 and $11,422 at December 31, 2019 and 2018, respectively. At December 31, 2019, the remaining weighted average amortization period is approximately 13.0 years. Future amortization of deferred leasing costs to be recognized during the current terms of our existing leases as of December 31, 2019, are estimated to be $5,013 in 2020, $4,292 in 2021, $3,469 in 2022, $2,944 in 2023, $2,473 in 2024 and $8,901 thereafter.

In February 2016, FASB issued Accounting Standards Update, or ASU, No. 2016-02, Leases. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases and ASU No. 2018-11, Leases (Topic 842): Targeted Improvements. In December 2018, the FASB issued ASU No. 2018-20 Leases (Topic 842), Narrow-Scope Improvements for Lessors. Collectively, these standards set out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). ASU No. 2016-02 requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification will determine whether the lease expense is recognized based on an effective interest method or on a straight line basis over the term of the lease. ASU No. 2016-02 requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales type leases, direct financing leases and operating leases. These standards were effective as of January 1, 2019. Upon adoption, we applied the package of practical expedients that has allowed us to not reassess (i) whether any expired or existing contracts are or contain leases, (ii) lease classification for any expired or existing leases and (iii) initial direct costs for any expired or existing leases. Furthermore,

we applied the optional transition method in ASU No. 2018-11, which has allowed us to initially apply the new leases standard at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the adoption period, although we did not have an adjustment. Additionally, our leases met the criteria in ASU No. 2018-11 to not separate non-lease components from the related lease component; therefore, the accounting for these leases remained largely unchanged from the previous standard. The adoption of ASU No. 2016-02 and the related improvements did not have a material impact in our consolidated financial statements. Upon adoption, (i) allowances for bad debts are now recognized as a direct reduction of rental income, and (ii) legal costs associated with the execution of our leases, which were previously capitalized and amortized over the life of their respective leases, are expensed as incurred. Subsequent to January 1, 2019, provisions for credit losses are now included in rental income in our consolidated financial statements for our leased properties. Provisions for credit losses prior to January 1, 2019 were previously included in property operating expenses in our consolidated financial statements for our leased properties and prior periods were not reclassified to conform to the current presentation. We completed our assessment of predominance as it relates to our contracts with residents for housing services at properties leased to our taxable REIT subsidiaries, or TRSs, and have recognized revenue from these properties under Codification Topic 606, Revenue from Contract with Customers, which did not have any impact to the timing or amount of our revenue recognized. For leases in which we are the lessee, we recognized a right of use asset and a lease liability equal to the present value of the minimum lease payments with rental payments being applied to the lease liability and the right of use asset being amortized over the term of the lease. The adoption of this standard resulted in an increase in total assets and liabilities of $4,507. The right of use asset and related lease liability are included within other assets, net and other liabilities, respectively, within our consolidated balance sheets. In addition, we lease equipment at certain of our managed senior living communities. These leases are short term in nature, are cancelable with no fee or do not result in an annual expense in excess of our capitalization policy and, as a result, will not be recorded on our consolidated balance sheets.

Certain of our leases provide for base rent payments and in addition may include variable payments. Rental income from operating leases, including any payments derived by index or market based indices, is recognized on a straight line basis over the lease term when we have determined that the collectability of substantially all of the lease payments is probable. Some of our leases have options to extend or terminate the lease exercisable at the option of our tenants, which are considered when determining the lease term. We do not include in our measurement of our lease receivables certain variable payments, including changes in the index or market based indices after the inception of the lease, certain tenant reimbursements and other income until the specific events that trigger the variable payments have occurred. Such payments totaled $78,668 for the year ended December 31, 2019.

Certain of our leases contain non-lease components, such as property level operating expenses and capital expenditures reimbursed by our tenants as well as other required lease payments. We have determined that all of our leases qualify for the practical expedient to not separate the lease and non-lease components because (i) the lease components are operating leases and (ii) the timing and pattern of recognition of the non-lease components are the same as those of the lease components. We apply Codification Topic 842, Leases, to the combined component. Income derived by our leases is recorded in rental income in our consolidated statements of comprehensive income (loss).

Certain tenants are obligated to pay directly their obligations under their leases for insurance, real estate taxes and certain other expenses. These obligations, which have been assumed by the tenants under the terms of their respective leases, are not reflected in our consolidated financial statements. To the extent any tenant responsible for any such obligations under the applicable lease defaults on such lease or if it is deemed probable that the tenant will fail to pay for such obligations, we would record a liability for such obligations.

PER COMMON SHARE AMOUNTS. We calculate basic earnings per common share by dividing net income (loss) by the weighted average number of our common shares of beneficial interest, $.01 par value, or our common shares, outstanding during the period. We calculate diluted earnings per common share using the more dilutive of the two class method or the treasury stock method. Unvested share awards and other potentially dilutive common shares and the related impact on earnings, are considered when calculating diluted earnings per share.

INCOME TAXES. We have elected to be taxed as a REIT under the United States Internal Revenue Code of 1986, as amended, or the IRC, and as such are generally not subject to federal and most state income taxation on our operating income, provided we distribute our taxable income to our shareholders and meet certain organization and operating requirements. We do, however, lease substantially all of the senior living communities managed for our account to our TRSs, that, unlike most of our subsidiaries, file separate tax returns and are subject to federal and state income taxes. Our consolidated income tax provision includes the income tax provision related to the operations of our TRSs and certain state income taxes incurred by us, despite 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. Tax benefits 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.