10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended March 31, 2012

OR

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

For the transition period from              to             

Commission File Number: 1-9044

DUKE REALTY CORPORATION

(Exact Name of Registrant as Specified in Its Charter)

Indiana	35-1740409
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification Number)
600 East 96thStreet, Suite 100 Indianapolis, Indiana	46240
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s Telephone Number, Including Area Code: (317) 808-6000

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 x    No   ¨

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 during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes  x    No  ¨

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 definition of “large accelerated filer”, “accelerated filer”, and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

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  ¨    NO  x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date:

Class	Outstanding at May 4, 2012
Common Stock, $.01 par value per share	266,446,952

DUKE REALTY CORPORATION

INDEX

		Page
Part I - Financial Information
Item 1.	Financial Statements
	Consolidated Balance Sheets as of March 31, 2012 (Unaudited) and December 31, 2011	3
	Consolidated Statements of Operations and Comprehensive Income (Unaudited) for the three months ended March 31, 2012 and 2011	4
	Consolidated Statements of Cash Flows (Unaudited) for the three months ended March 31, 2012 and 2011	5
	Consolidated Statement of Changes in Equity (Unaudited) for the three months ended March 31, 2012	6
	Notes to Consolidated Financial Statements (Unaudited)	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	16
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	28
Item 4.	Controls and Procedures	29
Part II - Other Information
Item 1.	Legal Proceedings	30
Item 1A.	Risk Factors	30
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	30
Item 3.	Defaults Upon Senior Securities	30
Item 4.	Mine Safety Disclosures	31
Item 5.	Other Information	31
Item 6.	Exhibits	32

2

PART I - FINANCIAL INFORMATION

Item 1. Financial Statements

DUKE REALTY CORPORATION AND SUBSIDIARIES

Consolidated Balance Sheets

(in thousands, except per share amounts)

	March 31, 2012			December 31, 2011
	(Unaudited)
ASSETS
Real estate investments:
Land and improvements	$	1,209,840		$	1,202,872
Buildings and tenant improvements	4,868,066			4,766,793
Construction in progress	80,306			44,259
Investments in and advances to unconsolidated companies	361,818			364,859
Undeveloped land	622,642			622,635
	7,142,672			7,001,418
Accumulated depreciation	(1,151,322		)	(1,108,650		)
Net real estate investments	5,991,350			5,892,768
Real estate investments and other assets held-for-sale	19,395			55,580
Cash and cash equivalents	14,740			213,809
Accounts receivable, net of allowance of $2,693 and $3,597	24,045			22,255
Straight-line rent receivable, net of allowance of $6,997 and $7,447	111,115			105,900
Receivables on construction contracts, including retentions	33,257			40,247
Deferred financing costs, net of accumulated amortization of $42,720 and $59,109	39,685			42,268
Deferred leasing and other costs, net of accumulated amortization of $311,525 and $292,334	469,936			460,881
Escrow deposits and other assets	168,882			170,729
	$	6,872,405		$	7,004,437
LIABILITIES AND EQUITY
Indebtedness:
Secured debt	$	1,180,965		$	1,173,233
Unsecured notes	2,615,612			2,616,063
Unsecured lines of credit	20,293			20,293
	3,816,870			3,809,589
Liabilities related to real estate investments held-for-sale	643			975
Construction payables and amounts due subcontractors, including retentions	51,309			55,775
Accrued real estate taxes	76,263			69,272
Accrued interest	33,675			58,904
Other accrued expenses	29,058			60,174
Other liabilities	132,734			131,735
Tenant security deposits and prepaid rents	46,383			38,355
Total liabilities	4,186,935			4,224,779
Shareholders’ equity:
Preferred shares ($.01 par value); 5,000 shares authorized; 2,503 and 3,176 shares issued and outstanding	625,638			793,910
Common shares ($.01 par value); 400,000 shares authorized; 266,405 and 252,927 shares issued and outstanding	2,664			2,529
Additional paid-in capital	3,780,293			3,594,588
Accumulated other comprehensive income	1,506			987
Distributions in excess of net income	(1,758,467		)	(1,677,328		)
Total shareholders’ equity	2,651,634			2,714,686
Noncontrolling interests	33,836			64,972
Total equity	2,685,470			2,779,658
	$	6,872,405		$	7,004,437

See accompanying Notes to Consolidated Financial Statements

3

DUKE REALTY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Operations and Comprehensive Income

For the three months ended March 31,

(in thousands, except per share amounts)

(Unaudited)

	Three Months Ended
	2012			2011
Revenues:
Rental and related revenue	$	203,432		$	190,986
General contractor and service fee revenue	68,968			146,547
	272,400			337,533
Expenses:
Rental expenses	37,342			40,699
Real estate taxes	28,671			27,471
General contractor and other services expenses	63,921			135,664
Depreciation and amortization	91,613			77,822
	221,547			281,656
Other operating activities:
Equity in earnings of unconsolidated companies	1,509			1,073
Gain on sale of properties	(277		)	67,856
Undeveloped land carrying costs	(2,298		)	(2,309		)
Other operating expenses	(265		)	(85		)
General and administrative expenses	(11,839		)	(11,197		)
	(13,170		)	55,338
Operating income	37,683			111,215
Other income (expenses):
Interest and other income, net	146			87
Interest expense	(61,086		)	(52,124		)
Acquisition-related activity	(580		)	(589		)
Income (loss) from continuing operations	(23,837		)	58,589
Discontinued operations:
Loss before gain on sales	(749		)	(5,403		)
Gain on sale of depreciable properties	6,476			11,603
Income from discontinued operations	5,727			6,200
Net income (loss)	(18,110		)	64,789
Dividends on preferred shares	(13,193		)	(15,974		)
Adjustments for redemption/repurchase of preferred shares	(5,730		)	(163		)
Net (income) loss attributable to noncontrolling interests	643			(1,083		)
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569
Basic net income (loss) per common share:
Continuing operations attributable to common shareholders	$	(0.16	)	$	0.16
Discontinued operations attributable to common shareholders	0.02			0.03
Total	$	(0.14	)	$	0.19
Diluted net income (loss) per common share:
Continuing operations attributable to common shareholders	$	(0.16	)	$	0.16
Discontinued operations attributable to common shareholders	0.02			0.03
Total	$	(0.14	)	$	0.19
Weighted average number of common shares outstanding	258,365			252,406
Weighted average number of common shares and potential dilutive securities	258,365			258,837
Comprehensive income (loss):
Net income (loss)	$	(18,110	)	$	64,789
Other comprehensive income:
Derivative instrument activity	519			771
Other comprehensive income	519			771
Comprehensive income (loss)	$	(17,591	)	$	65,560

See accompanying Notes to Consolidated Financial Statements

4

DUKE REALTY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Cash Flows

For the three months ended March 31,

(in thousands)

(Unaudited)

	2012			2011
Cash flows from operating activities:
Net income (loss)	$	(18,110	)	$	64,789
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	63,860			67,063
Amortization of deferred leasing and other costs	28,396			27,918
Amortization of deferred financing costs	3,246			3,644
Straight-line rent adjustment	(5,852		)	(6,966		)
Earnings from land and depreciated property sales	(6,199		)	(79,459		)
Third-party construction contracts, net	(1,877		)	(13,974		)
Other accrued revenues and expenses, net	(43,116		)	(42,945		)
Operating distributions received in excess of equity in earnings from unconsolidated companies	4,995			7,955
Net cash provided by operating activities	25,343			28,025
Cash flows from investing activities:
Development of real estate investments	(29,639		)	(37,318		)
Acquisition of real estate investments and related intangible assets	(131,515		)	(22,261		)
Acquisition of undeveloped land	(12,180		)	—
Second generation tenant improvements, leasing costs and building improvements	(15,361		)	(17,476		)
Other deferred leasing costs	(9,142		)	(6,272		)
Other assets	502			2,816
Proceeds from land and depreciated property sales, net	63,281			437,494
Capital distributions from unconsolidated companies	—			54,730
Capital contributions and advances to unconsolidated companies, net	(3,521		)	(6,068		)
Net cash provided by (used for) investing activities	(137,575		)	405,645
Cash flows from financing activities:
Proceeds from issuance of common shares, net	146,969			—
Payments for redemption/repurchase of preferred shares	(168,272		)	(2,096		)
Payments on unsecured debt	(451		)	(42,948		)
Payments on secured indebtedness including principal amortization	(10,455		)	(3,897		)
Payments on lines of credit, net	—			(174,717		)
Distributions to common shareholders	(43,922		)	(42,892		)
Distributions to preferred shareholders	(9,467		)	(15,974		)
Distributions to noncontrolling interests	(1,033		)	(1,145		)
Deferred financing costs	(206		)	(1,270		)
Net cash used for financing activities	(86,837		)	(284,939		)
Net increase (decrease) in cash and cash equivalents	(199,069		)	148,731
Cash and cash equivalents at beginning of period	213,809			18,384
Cash and cash equivalents at end of period	$	14,740		$	167,115
Non-cash investing and financing activities:
Assumption of indebtedness and other liabilities in real estate acquisitions	$	19,626		$	85,955
Contribution of properties to unconsolidated companies	$	—		$	52,110
Conversion of Limited Partner Units to common shares	$	29,460		$	933
Issuance of Limited Partner Units for acquisition	$	—		$	28,357
Preferred distributions declared but not paid	$	3,726		$	—

See accompanying Notes to Consolidated Financial Statements

5

DUKE REALTY CORPORATION AND SUBSIDIARIES

Consolidated Statement of Changes in Equity

For the three months ended March 31,2012

(in thousands, except per share data)

(Unaudited)

	Common Shareholders
	Preferred Stock			Common Stock		Additional Paid-in Capital		Accumulated Other Comprehensive Income		Distributions in Excess of Net Income			Non- Controlling Interests			Total
Balance at December 31, 2011	$	793,910		$	2,529	$	3,594,588	$	987	$	(1,677,328	)	$	64,972		$	2,779,658
Net loss	—			—		—		—		(17,467		)	(643		)	(18,110		)
Other comprehensive income	—			—		—		519		—			—			519
Issuance of common shares				108		146,329				—						146,437
Stock based compensation plan activity	—			4		4,209		—		(827		)	—			3,386
Conversion of Limited Partner Units	—			23		29,437		—		—			(29,460		)	—
Distributions to preferred shareholders	—			—		—		—		(13,193		)	—			(13,193		)
Redemption of preferred shares	(168,272		)	—		5,730		—		(5,730		)	—			(168,272		)
Distributions to common shareholders ($0.17 per share)	—			—		—		—		(43,922		)	—			(43,922		)
Distributions to noncontrolling interests	—			—		—		—		—			(1,033		)	(1,033		)
Balance at March 31, 2012	$	625,638		$	2,664	$	3,780,293	$	1,506	$	(1,758,467	)	$	33,836		$	2,685,470

See accompanying Notes to Consolidated Financial Statements

6

DUKE REALTY CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.    General Basis of Presentation

The interim consolidated financial statements included herein have been prepared by Duke Realty Corporation (the “Company”). The 2011 year-end consolidated balance sheet data included in this Quarterly Report on Form 10-Q (this “Report”) was derived from the audited financial statements in our Annual Report on Form 10-K for the year ended December 31, 2011, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). The financial statements have been prepared in accordance with GAAP for interim financial information and in accordance with Rule 10-01 of Regulation S-X of the Securities Exchange Act of 1934, as amended. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenue and expenses during the reporting period. Our actual results could differ from those estimates and assumptions. These financial statements should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations included herein and the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2011.

We believe that we qualify as a real estate investment trust (“REIT”) under the provisions of the Internal Revenue Code of 1986, as amended (the “Code”). Substantially all of our Rental Operations (see Note 9) are conducted through Duke Realty Limited Partnership (“DRLP”). We owned approximately 98.3% of the common partnership interests of DRLP (“Units”) at March 31, 2012. At the option of the holders, and subject to certain restrictions, the remaining Units are redeemable for shares of our common stock on a one-to-one basis and earn dividends at the same rate as shares of our common stock. If it is determined to be necessary in order to continue to qualify as a REIT, we may elect to purchase the Units for an equivalent amount of cash rather than issuing shares of common stock upon redemption. We conduct our Service Operations (see Note 9) through Duke Realty Services, LLC, Duke Realty Services Limited Partnership and Duke Construction Limited Partnership (“DCLP”), which are consolidated entities that are 100% owned by a combination of us and DRLP. DCLP is owned through a taxable REIT subsidiary. The consolidated financial statements include our accounts and the accounts of our majority-owned or controlled subsidiaries. In this Report, unless the context indicates otherwise, the terms “we,” “us” and “our” refer to the Company and those entities owned or controlled by the Company.

2.    Reclassifications

Certain amounts in the accompanying consolidated financial statements for 2011 have been reclassified to conform to the 2012 consolidated financial statement presentation.

3.    Variable Interest Entities

At March 31, 2012, there are three unconsolidated joint ventures that we have determined meet the criteria to be considered variable interest entities (“VIEs”). These three unconsolidated joint ventures were formed with the sole purpose of developing, constructing, leasing, marketing and selling or operating properties. The business activities of these unconsolidated joint ventures have been financed through a combination of equity contributions, partner/member loans, and third-party debt that is guaranteed by both us and the other partner/member of each entity. All significant decisions for these unconsolidated joint ventures, including those decisions that most significantly impact each venture’s economic performance, require unanimous approval of each joint venture’s partners or members. In certain cases, these decisions also require lender approval. Unanimous approval requirements for these unconsolidated joint ventures include entering into new leases, setting annual operating budgets, selling underlying properties, and incurring additional indebtedness. Because no single entity exercises control over the decisions that most significantly affect each joint venture’s economic performance, we determined that the equity method of accounting is appropriate.

7

The following is a summary of the carrying value in our consolidated balance sheet, as well as our maximum loss exposure under guarantees for the three unconsolidated subsidiaries that we have determined to be VIEs as of March 31, 2012 (in millions):

	Carrying Value			Maximum Loss Exposure
Investment in Unconsolidated Companies	$	33.5		$	33.5
Guarantee Obligations (1)	$	(16.6	)	$	(55.9	)

(1) We are party to guarantees of the third-party debt of these joint ventures and our maximum loss exposure is equal to the maximum monetary obligation pursuant to the guarantee agreements. We have recorded a liability for our probable future obligation under a guarantee to the lender of one of these ventures. Pursuant to an agreement with the lender, we may make partner loans to this joint venture that will reduce our maximum guarantee obligation on a dollar-for-dollar basis. The carrying value of our recorded guarantee obligations is included in other liabilities in our Consolidated Balance Sheets.

4.    Acquisitions and Dispositions

2012 Acquisitions

We acquired seven operating properties during the three months ended March 31, 2012. These acquisitions consisted of one industrial property near Chicago, Illinois, two industrial properties in Columbus, Ohio and four medical office properties in various markets. The following table summarizes our allocation of the fair value of amounts recognized for each major class of assets and liabilities (in thousands) for these acquisitions:

Real estate assets	$	130,615
Lease related intangible assets	22,451
Other assets	2,829
Total acquired assets	155,895
Secured debt	18,741
Other liabilities	885
Total assumed liabilities	19,626
Fair value of acquired net assets	$	136,269

The leases in the acquired properties had a weighted average remaining life at acquisition of approximately 8.7 years.

Fair Value Measurements

The fair value estimates used in allocating the aggregate purchase price of each acquisition among the individual components of real estate assets and liabilities were determined primarily through calculating the “as-if vacant” value of each building, using the income approach, and relied significantly upon internally determined assumptions. As a result, we have, thus, determined these estimates to have been primarily based upon Level 3 inputs, which are unobservable inputs based on our own assumptions. The range of most significant assumptions utilized in making the lease-up and future disposition estimates used in calculating the “as-if vacant” value of each building acquired during the three months ended March 31, 2012 were as follows:

	Low		High
Discount rate	7.19	%	8.78	%
Exit capitalization rate	6.09	%	7.40	%
Lease-up period (months)	9		19
Net rental rate per square foot – Industrial	$2.75		$3.59
Net rental rate per square foot – Medical Office	$16.10		$26.14

8

Dispositions

We disposed of income-producing real estate assets and undeveloped land and received net proceeds of $63.3 million and $437.5 million, respectively, during the three months ended March 31, 2012 and 2011.

5.    Indebtedness

The following table summarizes the book value and changes in the fair value of our debt for the three months ended March 31, 2012 (in thousands):

	Book Value at 12/31/11		Book Value at 3/31/12		Fair Value at 12/31/11		Issuances and Assumptions		Payoffs			Adjustments to Fair Value			Fair Value at 3/31/12
Fixed rate secured debt	$	1,167,188	$	1,174,920	$	1,256,331	$	18,741	$	(11,009	)	$	(840	)	$	1,263,223
Variable rate secured debt	6,045		6,045		6,045		—		—			—			6,045
Unsecured notes	2,616,063		2,615,612		2,834,610		—		(451		)	59,227			2,893,386
Unsecured lines of credit	20,293		20,293		20,244		—		—			4			20,248
Total	$	3,809,589	$	3,816,870	$	4,117,230	$	18,741	$	(11,460	)	$	58,391		$	4,182,902

Fixed Rate Secured Debt

Because our fixed rate secured debt is not actively traded in any marketplace, we utilized a discounted cash flow methodology to determine its fair value. Accordingly, we calculated fair value by applying an estimate of the current market rate to discount the debt’s remaining contractual cash flows. Our estimate of a current market rate, which is the most significant input in the discounted cash flow calculation, is intended to replicate debt of similar maturity and loan-to-value relationship. The estimated rates ranged from 3.50% to 5.40%, depending on the attributes of the specific loans. The current market rates we utilized were internally estimated; therefore, we have concluded that our determination of fair value for our fixed rate secured debt was primarily based upon Level 3 inputs.

We assumed one secured loan in conjunction with our acquisition activity in 2012. This assumed loan had a total face value of $18.1 million and fair value of $18.7 million. This assumed loan carries a stated interest rate of 5.14% and a remaining term upon acquisition of 2.2 years. We used an estimated market rate of 3.50% in determining the fair value of this loan.

Unsecured Notes

All but $21.0 million of our unsecured notes bear interest at fixed rates. We utilized broker estimates in estimating the fair value of our fixed rate unsecured debt. Our unsecured notes are thinly traded and, in certain cases, the broker estimates were not based upon comparable transactions. The broker estimates took into account any recent trades within the same series of our fixed rate unsecured debt, comparisons to recent trades of other series of our fixed rate unsecured debt, trades of fixed rate unsecured debt from companies with profiles similar to ours, as well as overall economic conditions. We reviewed these broker estimates for reasonableness and accuracy, considering whether the estimates were based upon market participant assumptions within the principal and most advantageous market and whether any other observable inputs would be more accurate indicators of fair value than the broker estimates. We concluded that the broker estimates were representative of fair value. We have determined that our estimation of the fair value of our fixed rate unsecured debt was primarily based upon Level 3 inputs, as defined. The estimated trading values of our fixed rate unsecured debt, depending on the maturity and coupon rates, ranged from 102.00% to 124.00% of face value.

The indentures (and related supplemental indentures) governing our outstanding series of notes also require us to comply with financial ratios and other covenants regarding our operations. We were in compliance with all such covenants as of March 31, 2012.

Unsecured Lines of Credit

Our unsecured lines of credit as of March 31, 2012 are described as follows (in thousands):

9

Description	Maximum Capacity		Maturity Date	Outstanding Balance at March 31, 2012
Unsecured Line of Credit - DRLP	$	850,000	December 2015	$	—
Unsecured Line of Credit - Consolidated Subsidiary	$	30,000	July 2012	$	20,293

The DRLP unsecured line of credit has an interest rate on borrowings of LIBOR plus 1.25%, and a maturity date of December 2015. Subject to certain conditions, the terms also include an option to increase the facility by up to an additional $400.0 million, for a total of up to $1.25 billion.

This line of credit provides us with an option to obtain borrowings from financial institutions that participate in the line at rates that may be lower than the stated interest rate, subject to certain restrictions.

This line of credit contains financial covenants that require us to meet certain financial ratios and defined levels of performance, including those related to fixed charge coverage, unsecured interest expense coverage and debt-to-asset value (with asset value being defined in the DRLP unsecured line of credit agreement). As of March 31, 2012, we were in compliance with all covenants under this line of credit.

The consolidated subsidiary’s unsecured line of credit allows for borrowings up to $30.0 million at a rate of LIBOR plus 0.85% (equal to 1.09% for outstanding borrowings as of March 31, 2012). This unsecured line of credit is used to fund development activities within the consolidated subsidiary and matures in July 2012.

To the extent that there are outstanding borrowings, we utilize a discounted cash flow methodology in order to estimate the fair value of our unsecured lines of credit. The net present value of the difference between future contractual interest payments and future interest payments based on our estimate of a current market rate represents the difference between the book value and the fair value. Our estimate of a current market rate is based upon the rate, considering current market conditions and our specific credit profile, at which we estimate we could obtain similar borrowings. The current market rate of 1.74% that we utilized was internally estimated; therefore, we have concluded that our determination of fair value for our consolidated subsidiary's unsecured line of credit was primarily based upon a Level 3 input.

6.    Shareholders' Equity

In March 2012, we redeemed all of the outstanding shares of our 6.95% Series M Cumulative Redeemable Preferred Shares at a liquidation amount of $168.3 million. Original offering costs of $5.7 million were included as a reduction to net loss attributable to common shareholders in conjunction with the redemption of these shares.

In the first three months of 2012, we issued 10.8 million shares of common stock pursuant to our at the market offering, generating net proceeds of approximately $147.0 million. We paid $3.0 million in commissions related to the sale of these common shares. The proceeds from this offering were contributed to DRLP in exchange for additional Units in DRLP and were used for acquisitions, general corporate purposes and redemption of preferred shares and fixed rate secured debt.

7.    Related Party Transactions

We provide property management, asset management, leasing, construction and other tenant related services to unconsolidated companies in which we have equity interests. We recorded the corresponding fees based on contractual terms that approximate market rates for these types of services and we have eliminated our ownership percentage of these fees in the consolidated financial statements. The following table summarizes the fees earned from these companies for the three months ended March 31, 2012 and 2011, respectively (in thousands): 

10

	Three Months Ended March 31,
	2012		2011
Management fees	$	2,731	$	1,977
Leasing fees	1,294		1,804
Construction and development fees	843		1,581

8.    Net Income (Loss) Per Common Share

Basic net income (loss) per common share is computed by dividing net income (loss) attributable to common shareholders, less dividends on share-based awards expected to vest (referred to as “participating securities” and primarily composed of unvested restricted stock units), by the weighted average number of common shares outstanding for the period. Diluted net income (loss) per common share is computed by dividing the sum of basic net income (loss) attributable to common shareholders and the noncontrolling interest in earnings allocable to Units not owned by us (to the extent the Units are dilutive) by the sum of the weighted average number of common shares outstanding and, to the extent they are dilutive, Units outstanding, as well as any potential dilutive securities for the period.

The following table reconciles the components of basic and diluted net income (loss) per common share for the three months ended March 31, 2012 and 2011, respectively (in thousands): 

	Three Months Ended March 31,
	2012			2011
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569
Less: Dividends on participating securities	(852		)	(799		)
Basic net income (loss) attributable to common shareholders	(37,242		)	46,770
Noncontrolling interest in earnings of common unitholders	—			1,205
Diluted net income (loss) attributable to common shareholders	$	(37,242	)	$	47,975
Weighted average number of common shares outstanding	258,365			252,406
Weighted average partnership Units outstanding	—			6,384
Other potential dilutive shares	—			47
Weighted average number of common shares and potential dilutive securities	258,365			258,837

The partnership Units are anti-dilutive for the three months ended March 31, 2012 as a result of the net loss for this period. In addition, substantially all potential shares related to our stock-based compensation plans were anti-dilutive for both periods presented and potential shares related to our 3.75% Exchangeable Senior Notes (“Exchangeable Notes”), which were repaid in December 2011, were anti-dilutive for the three months ended March 31, 2011. The following table summarizes the data that is excluded from the computation of net income (loss) per common share as a result of being anti-dilutive (in thousands):

	Three Months Ended March 31,
	2012			2011
Noncontrolling interest in earnings of common unitholders	$	(811	)	$	—
Weighted average partnership Units outstanding	5,749			—
Other potential dilutive shares:
Anti-dilutive outstanding potential shares under fixed stock option and other stock-based compensation plans	1,733			1,711
Anti-dilutive potential shares under the Exchangeable Notes	—			3,432
Outstanding participating securities	5,051			4,752

11

9.    Segment Reporting

We have four reportable operating segments at March 31, 2012, the first three of which consist of the ownership and rental of (i) industrial, (ii) office and (iii) medical office real estate investments. The operations of our industrial, office and medical office properties, along with our retail properties, are collectively referred to as “Rental Operations.” Our retail properties, as well as any other properties not included in our reportable segments, do not by themselves meet the quantitative thresholds for separate presentation as a reportable segment. The fourth reportable segment consists of various real estate services such as property management, asset management, maintenance, leasing, development and construction management to third-party property owners and joint ventures, and is collectively referred to as “Service Operations.” Our reportable segments offer different products or services and are managed separately because each segment requires different operating strategies and management expertise.

As of March 31, 2012, one of the quantitative thresholds was triggered, which required our medical office property operating segment to be presented as a separate reportable segment. As such, our medical office properties are presented as a separate reportable segment for the three-month period ended March 31, 2012 as well as for the comparative prior period.

Other revenue consists of other operating revenues not identified with one of our operating segments. Interest expense and other non-property specific revenues and expenses are not allocated to individual segments in determining our performance measure.

We assess and measure our overall operating results based upon an industry performance measure referred to as Funds From Operations (“FFO”), which management believes is a useful indicator of our consolidated operating performance. FFO is used by industry analysts and investors as a supplemental operating performance measure of a REIT. The National Association of Real Estate Investment Trusts (“NAREIT”) created FFO as a supplemental measure of REIT operating performance that excludes historical cost depreciation, among other items, from net income determined in accordance with GAAP. FFO is a non-GAAP financial measure. The most comparable GAAP measure is net income (loss) attributable to common shareholders. FFO attributable to common shareholders should not be considered as a substitute for net income (loss) attributable to common shareholders or any other measures derived in accordance with GAAP and may not be comparable to other similarly titled measures of other companies. FFO is calculated in accordance with the definition that was adopted by the Board of Governors of NAREIT. We do not allocate certain income and expenses (“Non-Segment Items”, as shown in the table below) to our operating segments. Thus, the operational performance measure presented here on a segment-level basis represents net earnings, excluding depreciation expense and the Non-Segment Items not allocated, and is not meant to present FFO as defined by NAREIT.

Historical cost accounting for real estate assets in accordance with GAAP implicitly assumes that the value of real estate assets diminishes predictably over time. Since real estate values instead have historically risen or fallen with market conditions, many industry analysts and investors have considered presentation of operating results for real estate companies that use historical cost accounting to be insufficient by themselves. FFO, as defined by NAREIT, represents GAAP net income (loss), excluding extraordinary items as defined under GAAP and gains or losses from sales of previously depreciated real estate assets, impairment charges related to depreciable real estate assets, plus certain non-cash items such as real estate asset depreciation and amortization, and after similar adjustments for unconsolidated partnerships and joint ventures.

Management believes that the use of FFO attributable to common shareholders, combined with net income (which remains the primary measure of performance), improves the understanding of operating results of REITs among the investing public and makes comparisons of REIT operating results more meaningful. Management believes that excluding gains or losses related to sales of previously depreciated real estate assets, impairment charges related to depreciable real estate assets and real estate asset depreciation and amortization enables investors and analysts to readily identify the operating results of the long-term assets that form the core of a REIT’s activity and assist them in comparing these operating results between periods or between different companies.

12

The following table shows (i) the revenues for each of the reportable segments and (ii) a reconciliation of FFO attributable to common shareholders to net income (loss) attributable to common shareholders for the three months ended March 31, 2012 and 2011, respectively (in thousands): 

	Three Months Ended March 31,
	2012			2011
Revenues
Rental Operations:
Industrial	$	108,487		$	94,262
Office	67,417			75,602
Medical Office	20,741			13,484
Non-reportable Rental Operations	5,658			5,655
General contractor and service fee revenue (“Service Operations”)	68,968			146,547
Total Segment Revenues	271,271			335,550
Other Revenue	1,129			1,983
Consolidated Revenue from continuing operations	272,400			337,533
Discontinued Operations	1,234			52,170
Consolidated Revenue	$	273,634		$	389,703
Reconciliation of Funds From Operations
Net earnings excluding depreciation and Non-Segment Items
Industrial	$	79,902		$	66,726
Office	39,490			43,100
Medical Office	13,667			7,802
Non-reportable Rental Operations	4,008			4,207
Service Operations	5,047			10,883
	142,114			132,718
Non-Segment Items:
Interest expense	(61,086		)	(52,124		)
Interest and other income	146			87
Other operating expenses	(265		)	(85		)
General and administrative expenses	(11,839		)	(11,197		)
Undeveloped land carrying costs	(2,298		)	(2,309		)
Acquisition-related activity	(580		)	(589		)
Other non-segment income	352			981
Net (income) loss attributable to noncontrolling interests	643			(1,083		)
Noncontrolling interest share of FFO adjustments	(2,060		)	(569		)
Joint venture items	10,095			8,610
Dividends on preferred shares	(13,193		)	(15,974		)
Adjustments for redemption/repurchase of preferred shares	(5,730		)	(163		)
Discontinued operations	(106		)	11,756
FFO attributable to common shareholders	56,193			70,059
Depreciation and amortization on continuing operations	(91,613		)	(77,822		)
Depreciation and amortization on discontinued operations	(643		)	(17,159		)
Company’s share of joint venture adjustments	(8,586		)	(7,628		)
Earnings from depreciated property sales on continuing operations	(277		)	67,856
Earnings from depreciated property sales on discontinued operations	6,476			11,603
Earnings from depreciated property sales—share of joint venture	—			91
Noncontrolling interest share of FFO adjustments	2,060			569
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569

13

The assets for each of the reportable segments as of March 31, 2012 and December 31, 2011 are as follows (in thousands):

	March 31, 2012		December 31, 2011
Assets
Rental Operations:
Industrial	$	3,634,930	$	3,586,250
Office	1,683,691		1,742,196
Medical Office	674,298		580,177
Non-reportable Rental Operations	202,139		209,056
Service Operations	162,468		167,382
Total Segment Assets	6,357,526		6,285,061
Non-Segment Assets	514,879		719,376
Consolidated Assets	$	6,872,405	$	7,004,437

10.    Discontinued Operations and Assets Held for Sale

The following table illustrates the number of properties in discontinued operations:

	Held for Sale at March 31, 2012	Sold in 2012	Sold in 2011	Total
Office	0	7	93	100
Industrial	2	6	7	15
Retail	1	0	1	2
	3	13	101	117

We allocate interest expense to discontinued operations and have included such interest expense in computing income from discontinued operations. Interest expense allocable to discontinued operations includes interest on any secured debt for properties included in discontinued operations and an allocable share of our consolidated unsecured interest expense for unencumbered properties. The allocation of unsecured interest expense to discontinued operations was based upon the gross book value of the unencumbered real estate assets included in discontinued operations as it related to the total gross book value of our unencumbered real estate assets.

The following table illustrates the operations of the buildings reflected in discontinued operations for the three months ended March 31, 2012 and 2011, respectively (in thousands):

	Three Months Ended March 31,
	2012			2011
Revenues	$	1,234		$	52,170
Operating expenses	(815		)	(25,273		)
Depreciation and amortization	(643		)	(17,159		)
Operating income (loss)	(224		)	9,738
Interest expense	(525		)	(15,141		)
Loss before gain on sales	(749		)	(5,403		)
Gain on sale of depreciable properties	6,476			11,603
Income from discontinued operations	$	5,727		$	6,200

14

Dividends on preferred shares and adjustments for the redemption or repurchase of preferred shares are allocated entirely to continuing operations. The following table illustrates the allocation of the income (loss) attributable to common shareholders between continuing operations and discontinued operations, reflecting an allocation of income or loss attributable to noncontrolling interests between continuing and discontinued operations, for the three months ended March 31, 2012 and 2011, respectively (in thousands):

	Three Months Ended March 31,
	2012			2011
Income (loss) from continuing operations attributable to common shareholders	$	(41,992	)	$	41,522
Income from discontinued operations attributable to common shareholders	5,602			6,047
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569

At March 31, 2012, we classified three in-service properties as held-for-sale, which were included in discontinued operations, due to our present intention to sell the properties in the second quarter. The following table illustrates aggregate balance sheet information of the aforementioned three properties included in discontinued operations at March 31, 2012 (in thousands):

Real estate investment, net	$	18,159
Other assets	1,236
Total assets held-for-sale	$	19,395
Accrued expenses	$	434
Other liabilities	209
Total liabilities held-for-sale	$	643

11.    Subsequent Events

Declaration of Dividends

Our board of directors declared the following dividends at its regularly scheduled board meeting held on April 25, 2012:

Class	Quarterly Amount/Share	Record Date	Payment Date
Common	$0.17	May 16, 2012	May 31, 2012
Preferred (per depositary share):
Series J	$0.414063	May 16, 2012	May 31, 2012
Series K	$0.406250	May 16, 2012	May 31, 2012
Series L	$0.412500	May 16, 2012	May 31, 2012
Series O	$0.523437	June 15, 2012	July 2, 2012

15

Item 2.    Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following Management’s Discussion and Analysis of Financial Condition and Results of Operations is intended to help the reader understand our operations and our present business environment. Management’s Discussion and Analysis is provided as a supplement to and should be read in conjunction with our consolidated financial statements and the notes thereto, contained in Part I, Item I of this Quarterly Report on Form 10-Q (this “Report”) and the consolidated financial statements and notes thereto, contained in Part IV, Item 15 of our Annual Report on Form 10-K for the year ended December 31, 2011, as filed with the Securities and Exchange Commission (the “SEC”) on February 24, 2012. As used herein, the terms “we”, “us” and “our” refer to Duke Realty Corporation (the “Company”) and those entities owned or controlled by the Company.

Cautionary Notice Regarding Forward-Looking Statements

Certain statements contained in or incorporated by reference into this Report including, without limitation, those related to our future operations, constitute “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The words “believe,” “estimate,” “expect,” “anticipate,” “intend,” “plan,” “seek,” “may,” and similar expressions or statements regarding future periods are intended to identify forward-looking statements.

These forward-looking statements involve known and unknown risks, uncertainties and other important factors that could cause our actual results, performance or achievements, or industry results, to differ materially from any predictions of future results, performance or achievements that we express or imply in this Report. Some of the risks, uncertainties and other important factors that may affect future results include, among others:

• Changes in general economic and business conditions, including the financial condition of our tenants and the value of our real estate assets;

• Our continued qualification as a real estate investment trust (“REIT”) for U.S. federal income tax purposes;

• Heightened competition for tenants and potential decreases in property occupancy;

• Potential changes in the financial markets and interest rates;

• Volatility in our stock price and trading volume;

• Our continuing ability to raise funds on favorable terms;

• Our ability to successfully identify, acquire, develop and/or manage properties on terms that are favorable to us;

• Potential increases in real estate construction costs;

• Our ability to successfully dispose of properties on terms that are favorable to us, including, without limitation, through one or more transactions that are consistent with our previously disclosed strategic plans;

• Our ability to retain our current credit ratings;

• Inherent risks in the real estate business, including, but not limited to, tenant defaults, potential liability relating to environmental matters, climate change and liquidity of real estate investments; and

• Other risks and uncertainties described herein, as well as those risks and uncertainties discussed from time to time in our other reports and other public filings with the SEC.

Although we presently believe that the plans, expectations and results expressed in or suggested by the forward-looking statements are reasonable, all forward-looking statements are inherently subjective, uncertain and subject to change, as they involve substantial risks and uncertainties beyond our control. New factors emerge from time to time, and it is not possible for us to predict the nature, or assess the potential impact, of each new factor on our business. Given these uncertainties, we caution you not to place undue reliance on these forward-looking statements. We undertake no obligation to update or revise any of our forward-looking statements for events or circumstances that arise after the statement is made, except as otherwise may be required by law.

This list of risks and uncertainties, however, is only a summary of some of the most important factors and is not intended to be exhaustive. Additional information regarding risk factors that may affect us is included under the caption “Risk Factors” in Part II, Item 1A of this Report, and in our Annual Report on Form 10-K for the fiscal year ended December 31, 2011, which we filed with the SEC on February 24, 2012. The risk factors contained in our Annual Report are updated by us from time to time in Quarterly Reports on Form 10-Q and other public filings. 

16

Business Overview

We are a self-administered and self-managed REIT that began operations through a related entity in 1972. A more complete description of our business, and of management’s philosophy and priorities, is included in our 2011 Annual Report on Form 10-K.

As of March 31, 2012, we:

• Owned or jointly controlled 747 industrial, office, medical office and other properties, of which 738 properties with more than 136.5 million square feet are in service and nine properties with more than 2.4 million square feet are under development. The 738 in-service properties are comprised of 612 consolidated properties with more than 111.2 million square feet and 126 jointly controlled unconsolidated properties with approximately 25.3 million square feet. The nine properties under development consist of seven consolidated properties with approximately 1.8 million square feet and two jointly controlled unconsolidated properties with approximately 650,000 square feet.

• Owned, including through ownership interests in unconsolidated joint ventures, more than 4,800 acres of land and controlled more than 1,600 acres through purchase options.

A key component of our overall strategy is to increase our investment in quality industrial properties in both existing and select new markets, expand our medical office portfolio nationally to take advantage of demographic trends and to reduce our investment in suburban office properties and other non-strategic assets.

We have four reportable operating segments at March 31, 2012, the first three of which consist of the ownership and rental of (i) industrial, (ii) office and (iii) medical office real estate investments. The operations of our industrial, office and medical office properties, along with our retail properties, are collectively referred to as “Rental Operations.” Our retail properties, as well as any other properties not included in our reportable segments, do not by themselves meet the quantitative thresholds for separate presentation as a reportable segment. The fourth reportable segment consists of various real estate services such as property management, asset management, maintenance, leasing, development and construction management to third-party property owners and joint ventures, and is collectively referred to as “Service Operations.” Our reportable segments offer different products or services and are managed separately because each segment requires different operating strategies and management expertise.

As of March 31, 2012, one of the quantitative thresholds was triggered, which required our medical office property operating segment to be presented as a separate reportable segment. As such, our medical office properties are presented as a separate reportable segment for the three-month period ended March 31, 2012 as well as for the comparative prior period.

Key Performance Indicators

Our operating results depend primarily upon rental income from our Rental Operations. The following discussion highlights the areas of Rental Operations that we consider critical for future revenues.

Occupancy Analysis

Our ability to maintain high occupancy rates is a principal driver of maintaining and increasing rental revenue. The following table sets forth occupancy information regarding our in-service portfolio of consolidated rental properties, including properties classified within both continuing and discontinued operations, as of March 31, 2012 and 2011 respectively (in thousands, except percentage data):

17

	Total Square Feet		Percent of Total Square Feet				Percent Occupied
Type	2012	2011	2012		2011		2012		2011
Industrial	91,551	82,252	82.3	%	73.8	%	93.7	%	89.8	%
Office	15,767	26,295	14.2	%	23.6	%	83.8	%	84.6	%
Medical Office	3,076	2,069	2.8	%	1.9	%	90.2	%	86.4	%
Other	823	847	0.7	%	0.7	%	89.2	%	87.6	%
Total	111,217	111,463	100.0	%	100.0	%	92.1	%	88.5	%

Leasing activity and acquisitions within our industrial properties, coupled with significant dispositions of office properties, drove the overall increase in occupancy from March 31, 2011.

Lease Expiration and Renewals

Our ability to maintain and improve occupancy rates primarily depends upon our continuing ability to re-lease expiring space. The following table reflects our consolidated in-service portfolio lease expiration schedule by property type as of March 31, 2012. The table indicates square footage and annualized net effective rents (based on March 31, 2012 rental revenue) under expiring leases (in thousands, except percentage data):

	Total Consolidated Portfolio						Industrial				Office				Medical Office				Other
Year of Expiration	Square Feet		Ann. Rent Revenue		% of Revenue		Square Feet		Ann. Rent Revenue		Square Feet		Ann. Rent Revenue		Square Feet		Ann.  Rent Revenue		Square Feet		Ann.  Rent Revenue
Remainder of 2012	4,860		$	27,976	5	%	3,835		$	15,827	960		$	11,151	54		$	766	11		$	232
2013	15,335		78,465		14	%	13,480		52,446		1,780		24,754		42		599		33		666
2014	12,235		64,652		11	%	10,478		40,653		1,590		21,178		146		2,416		21		405
2015	12,967		65,812		11	%	11,176		43,411		1,740		21,384		27		461		24		556
2016	11,086		58,369		10	%	9,318		34,669		1,666		21,616		81		1,592		21		492
2017	10,676		58,835		10	%	8,984		33,555		1,274		16,718		233		4,471		185		4,091
2018	6,939		51,553		9	%	4,974		19,740		1,397		18,878		366		7,634		202		5,301
2019	5,925		37,127		6	%	4,679		17,467		976		13,050		192		4,196		78		2,414
2020	7,016		41,865		7	%	5,936		23,230		681		10,525		359		7,239		40		871
2021	5,627		34,248		6	%	4,686		18,785		586		7,009		325		7,747		30		707
2022 and Thereafter	9,811		60,055		11	%	8,220		28,173		554		8,960		948		21,320		89		1,602
Total Leased	102,477		$	578,957	100	%	85,766		$	327,956	13,204		$	175,223	2,773		$	58,441	734		$	17,337
Total Portfolio Square Feet	111,217						91,551				15,767				3,076				823
Percent Occupied	92.1	%					93.7	%			83.8	%			90.2	%			89.2	%

Within our consolidated properties, we renewed 83.1% and 69.2% of our leases up for renewal in the three months ended March 31, 2012 and 2011, respectively, totaling more than 2.7 million and approximately 2.9 million square feet, respectively. There was a 2.5% increase in average contractual rents on renewals during the three months ended March 31, 2012 compared to a 7.3% decline in average contractual rents on renewals during the three months ended March 31,2011.

The average term of renewals was 4.4 years for the three months ended March 31,2011 compared to 4.6 years for the three months ended March 31,2012.

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Acquisition and Disposition Activity

For the three months ended March 31, 2012, we acquired seven properties and other real estate-related assets with a total acquisition-date value of $153.1 million. For the three months ended March 31,2011, we acquired 13 properties for $132.2 million, which represented continued activity in our acquisition of a portfolio of buildings in South Florida (the “Premier Portfolio”), of which the initial 39 properties were acquired on December 30, 2010.

Net cash proceeds related to the dispositions of wholly owned buildings and undeveloped land totaled $63.3 million and $437.5 million for the three months ended March 31, 2012 and 2011, respectively. Included in the wholly owned building dispositions in the three months ended March 31,2011 is the sale of 13 suburban office properties for net proceeds of $273.7 million, totaling approximately 2.0 million square feet, to a joint venture in which we own 20%.

We regularly work to identify, consider and pursue opportunities to acquire and dispose of properties on an opportunistic basis and on a basis that is generally consistent with our strategic plans.

Development

At March 31, 2012, we had 2.4 million square feet of property under development with total estimated costs upon completion of $349.0 million compared to 3.4 million square feet with total costs upon completion of $181.0 million at March 31, 2011. We have continued to limit our development projects to build-to-suit or substantially pre-leased properties and select medical office developments. The square footage and estimated costs include both consolidated and joint venture development activity at 100%.

The following table summarizes our properties under development as of March 31, 2012 (in thousands, except percentage data): 

Ownership Type	Square Feet	Percent Leased	Total Estimated Project Costs		Total Incurred to Date		Amount Remaining to be Spent
Consolidated properties	1,772	95%	$	245,237	$	73,622	$	171,615
Joint venture properties	650	100%	103,803		13,833		89,970
Total	2,422	96%	$	349,040	$	87,455	$	261,585

Funds From Operations

Funds From Operations (“FFO”) is used by industry analysts and investors as a supplemental operating performance measure of a REIT. The National Association of Real Estate Investment Trusts (“NAREIT”) created FFO as a supplemental measure of REIT operating performance that excludes historical cost depreciation, among other items, from net income determined in accordance with accounting principles generally accepted in the United States of America (“GAAP”). FFO is a non-GAAP financial measure. The most comparable GAAP measure is net income (loss) attributable to common shareholders. FFO attributable to common shareholders should not be considered as a substitute for net income (loss) attributable to common shareholders or any other measures derived in accordance with GAAP and may not be comparable to other similarly titled measures of other companies. FFO is calculated in accordance with the definition that was adopted by the Board of Governors of NAREIT.

Historical cost accounting for real estate assets in accordance with GAAP implicitly assumes that the value of real estate assets diminishes predictably over time. Since real estate values instead have historically risen or fallen with market conditions, many industry analysts and investors have considered presentation of operating results for real estate companies that use historical cost accounting to be insufficient by themselves. FFO, as defined by NAREIT, represents GAAP net income (loss), excluding extraordinary items as defined under GAAP and gains or losses from sales of previously depreciated real estate assets, impairment charges related to depreciable real estate assets, plus certain non-cash items such as real estate asset depreciation and amortization, and after similar adjustments for unconsolidated partnerships and joint ventures.

19

Management believes that the use of FFO attributable to common shareholders, combined with net income (which remains the primary measure of performance), improves the understanding of operating results of REITs among the investing public and makes comparisons of REIT operating results more meaningful. Management believes that excluding gains or losses related to sales of previously depreciated real estate assets, impairment charges related to depreciable real estate assets and real estate asset depreciation and amortization enables investors and analysts to readily identify the operating results of the long-term assets that form the core of a REIT’s activity and assist them in comparing these operating results between periods or between different companies.

The following table shows a reconciliation of net income (loss) attributable to common shareholders to the calculation of FFO attributable to common shareholders for the three months ended March 31,2012 and 2011, respectively (in thousands):

	Three Months Ended March 31,
	2012			2011
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569
Adjustments:
Depreciation and amortization	92,256			94,981
Company share of joint venture depreciation and amortization	8,586			7,628
Earnings from depreciable property sales—wholly owned	(6,199		)	(79,459		)
Earnings from depreciable property sales—share of joint venture	—			(91		)
Noncontrolling interest share of adjustments	(2,060		)	(569		)
Funds From Operations attributable to common shareholders	$	56,193		$	70,059

Results of Operations

A summary of our operating results and property statistics for the three months ended March 31,2012 and 2011, respectively, is as follows (in thousands, except number of properties and per share data):

	Three Months Ended March 31,
	2012			2011
Rental and related revenue	$	203,432		$	190,986
General contractor and service fee revenue	68,968			146,547
Operating income	37,683			111,215
Net income (loss) attributable to common shareholders	(36,390		)	47,569
Weighted average common shares outstanding	258,365			252,406
Weighted average common shares and potential dilutive securities	258,365			258,837
Basic income (loss) per common share:
Continuing operations	$	(0.16	)	$	0.16
Discontinued operations	$	0.02		$	0.03
Diluted income (loss) per common share:
Continuing operations	$	(0.16	)	$	0.16
Discontinued operations	$	0.02		$	0.03
Number of in-service consolidated properties at end of period	612			658
In-service consolidated square footage at end of period	111,217			111,463
Number of in-service joint venture properties at end of period	126			128
In-service joint venture square footage at end of period	25,294			25,166

20

Comparison of Three Months Ended March 31, 2012 to Three Months Ended March 31, 2011

Rental and Related Revenue

The following table sets forth rental and related revenue from continuing operations by reportable segment for the three months ended March 31, 2012 and 2011, respectively (in thousands):

	Three Months Ended March 31,
	2012		2011
Rental and Related Revenue:
Industrial	$	108,487	$	94,262
Office	67,417		75,602
Medical Office	20,741		13,484
Non-reportable segments	6,787		7,638
Total Rental and Related Revenue from Continuing Operations	$	203,432	$	190,986

The following factors contributed to these results:

• We acquired 64 properties, of which 43 were industrial, and placed six developments in service from January 1, 2011 to March 31, 2012, which provided incremental revenues of $19.2 million in the first quarter of 2012, as compared to the same period in 2011.

• We sold 13 office properties to an unconsolidated joint venture in late March 2011, resulting in a $10.0 million decrease in rental and related revenue from continuing operations in the three months ended March 31, 2012.

• The remaining increase in rental and related revenues is primarily due to improved results within the properties that have been in service for all of 2011 and the first quarter of 2012. Improved occupancy, coupled with slight increases in renewal rates, drove the overall improvement within these properties.

• The overall shift of revenues and income from office properties to industrial properties is consistent with our continuing strategy to increase our asset concentration in industrial properties while reducing our overall investment in office properties.

Rental Expenses and Real Estate Taxes

The following table sets forth rental expenses and real estate taxes by reportable segment for the three months ended March 31, 2012 and 2011, respectively (in thousands):

	Three Months Ended March 31,
	2012		2011
Rental Expenses:
Industrial	$	11,480	$	12,481
Office	19,375		22,215
Medical Office	5,042		4,358
Non-reportable segments	1,445		1,645
Total Rental Expenses from Continuing Operations	$	37,342	$	40,699
Real Estate Taxes:
Industrial	$	17,105	$	15,055
Office	8,552		10,287
Medical Office	2,032		1,324
Non-reportable segments	982		805
Total Real Estate Tax Expense from Continuing Operations	$	28,671	$	27,471

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We sold 13 office properties to an unconsolidated joint venture in late March 2011, which resulted in a $2.7 million decrease in rental expenses in the first quarter of 2012 as compared to the same period in 2011. Partially offsetting the impact of this sale of properties to an unconsolidated joint venture was an increase to rental expenses of $2.0 million associated with the additional 64 properties acquired (of which 43 were industrial) and six developments placed in service since January 1, 2011. The remaining decrease in rental expenses was primarily attributable to a reduction in snow removal costs, which was a result of the mild winter our markets experienced in the first quarter of 2012.

We recognized incremental real estate tax expense of $2.6 million associated with the additional 64 properties acquired and six developments placed in service since January 1, 2011. This increase was partially offset by a decrease of $1.6 million related to the 13 properties that were sold to a joint venture during the first quarter of 2011.

Service Operations

The following table sets forth the components of the Service Operations reportable segment for the three months ended March 31, 2012 and 2011, respectively (in thousands):

	Three Months Ended March 31,
	2012			2011
Service Operations:
General contractor and service fee revenue	$	68,968		$	146,547
General contractor and other services expenses	(63,921		)	(135,664		)
Total	$	5,047		$	10,883

Service Operations primarily consist of the leasing, property management, asset management, development, construction management and general contractor services for joint venture properties and properties owned by third parties. Service Operations are heavily influenced by the current state of the economy, as leasing and property management fees are dependent upon occupancy, while construction and development services rely on the expansion of business operations of third-party property owners and joint venture partners. A significant decrease in total construction volume from the first quarter of 2011 drove the decrease in our earnings from Service Operations.

Depreciation and Amortization

Depreciation and amortization expense increased from $77.8 million during the first quarter of 2011 to $91.6 million for the same period in 2012, primarily due to depreciation related to additions to our asset base from properties acquired and developments placed in service in 2011 and 2012.

Gain on Sale of Properties

We recognized gains on sale of properties of $67.9 million for the three months ended March 31, 2011 compared to cost of sale adjustments of $277,000 for the same period in 2012. The sales in the first quarter of 2011 were comprised of 15 properties that did not meet the criteria for classification within discontinued operations. The cost of sales adjustments recognized in the first quarter of 2012, which resulted in a net reduction to the original gains on sale, represented changes in contingencies associated with properties that were sold in a prior period and not classified within discontinued operations.

General and Administrative Expense

General and administrative expenses increased from $11.2 million for the first quarter of 2011 to $11.8 million for the same period in 2012. General and administrative expenses consist of two components. The first component includes general corporate expenses and the second component includes the indirect operating costs not allocated to the development or operations of our wholly-owned properties and Service Operations. Those indirect costs not allocated to or absorbed by these operations are charged to general and administrative expenses. While our overall

22

pool of overhead expenses declined as a result of overhead reductions that took place near the end of 2011, the amount of such costs absorbed by development and other activities also declined, thus driving a slight increase in indirect costs charged to general and administrative expenses in the first quarter of 2012. The decrease in the absorption of costs by other areas was primarily a result of less construction activity that was partially offset by an increase in leasing activity.

Interest Expense

Interest expense allocable to continuing operations increased from $52.1 million in the first quarter of 2011 to $61.1 million in the first quarter of 2012. We had $15.1 million of interest expense allocated to discontinued operations in the first quarter of 2011, as the result of disposing of properties with a gross book value of $2.0 billion during 2011, compared to only $525,000 for the same period in 2012. Thus, total interest expense combined for continuing and discontinued operations decreased from $67.3 million to $61.6 million. This overall interest savings was primarily a result of carrying reduced average borrowings in the first quarter of 2012.

Discontinued Operations

Subject to certain criteria, the results of operations for properties sold during the year to unrelated parties or classified as held-for-sale at the end of the period are required to be classified as discontinued operations. The property specific components of earnings that are classified as discontinued operations include rental revenues, rental expenses, real estate taxes, allocated interest expense and depreciation expense, as well as the net gain or loss on the disposition of properties. The significant volume of building sales during the latter part of 2011 was the driving factor of there being $52.2 million in rental and related revenues classified within discontinued operations for the three months ended March 31, 2011, compared to only $1.2 million for the three months ended March 31, 2012.

The operations of 117 buildings are classified as discontinued operations for both the three months ended March 31, 2012 and March 31, 2011. These 117 buildings consist of 100 office, fifteen industrial, and two retail properties. As a result, we classified a loss, before gain on sales, of $749,000 and $5.4 million in discontinued operations for the three months ended March 31, 2012 and 2011, respectively.

Of these properties, 13 were sold during the first quarter of 2012 and nine were sold during the first quarter of 2011. The gains on disposal of $6.5 million and $11.6 million for the three months ended March 31, 2012 and 2011, respectively, are reported in discontinued operations.

Liquidity and Capital Resources

Sources of Liquidity

We expect to meet our short-term liquidity requirements over the next twelve months, including payments of dividends and distributions as well as capital expenditures needed to maintain our current real estate assets, primarily through working capital, net cash provided by operating activities and proceeds received from real estate dispositions. We had no outstanding borrowings on DRLP’s $850.0 million unsecured line of credit at March 31, 2012, which allows us significant additional flexibility for temporary financing of either short-term obligations or strategic acquisitions.

In addition to our existing sources of liquidity, we expect to meet long-term liquidity requirements, such as scheduled mortgage and unsecured debt maturities, property acquisitions, financing of development activities and other capital improvements, through multiple sources of capital including operating cash flow, proceeds from property dispositions and accessing the public debt and equity markets.

Rental Operations

Cash flows from Rental Operations is our primary source of liquidity and provides a stable source of cash flow to fund operational expenses. We believe that this cash-based revenue stream is substantially aligned with revenue recognition (except for periodic straight-line rental income accruals and amortization of above or below market

23

rents) as cash receipts from the leasing of rental properties are generally received in advance of, or a short time following, the actual revenue recognition.

We are subject to a number of risks as a result of general economic conditions, including reduced occupancy, tenant defaults and bankruptcies and potential reduction in rental rates upon renewal or re-letting of properties, any of which would result in reduced cash flow from operations.

Unsecured Debt and Equity Securities

We use the DRLP unsecured line of credit as a temporary source of capital to fund development activities, acquire additional rental properties and provide working capital.

At March 31, 2012, we had on file with the SEC an automatic shelf registration statement on Form S-3 relating to the offer and sale, from time to time, of an indeterminate amount of DRLP’s debt securities (including guarantees thereof) and the Company’s common shares, preferred shares and other securities. From time to time, we expect to issue additional securities under this automatic shelf registration statement to fund the repayment of long-term debt upon maturity and for other general corporate purposes.

On February 11, 2010, we entered into an at the market equity program that allowed us to issue new shares of our common stock, from time to time, with an aggregate offering price of up to $150.0 million. In the first three months of 2012, we issued 10.8 million shares of common stock under this at the market program. We paid $3.0 million in commissions related to the sales of these common shares, resulting in net proceeds of approximately $147.0 million.

The indentures (and related supplemental indentures) governing our outstanding series of notes require us to comply with financial ratios and other covenants regarding our operations. We were in compliance with all such covenants, as well as applicable covenants under our unsecured line of credit, as of March 31, 2012.

Sale of Real Estate Assets

We regularly work to identify, consider and pursue opportunities to dispose of non-strategic properties on an opportunistic basis and on a basis that is generally consistent with our strategic plans. Our ability to dispose of such properties on favorable terms, or at all, is dependent upon a number of factors including the availability of credit to potential buyers to purchase properties at prices that we consider acceptable. Although we believe we have demonstrated our ability to generate significant liquidity through the disposition of non-strategic properties, potential future adverse changes to general market and economic conditions could negatively impact our further ability to dispose of such properties.

Transactions with Unconsolidated Entities

Transactions with unconsolidated partnerships and joint ventures also provide a source of liquidity. From time to time we will sell properties to unconsolidated entities, while retaining a continuing interest in that entity, and receive proceeds commensurate to those interests that we do not own. Additionally, unconsolidated entities will from time to time obtain debt financing and will distribute to us, and our joint venture partners, all or a portion of the proceeds from such debt financing.

We have a 20% equity interest in an unconsolidated joint venture (“Duke/Hulfish”) which, along with its subsidiary entities, has acquired 35 properties from us since its formation in May 2008. We have received cumulative net sale and financing proceeds of approximately $847.2 million through March 31, 2012. We are party to an agreement that allows Duke/Hulfish a right of first offer to acquire future build-to-suit or speculative developments on certain specified parcels of our undeveloped land.

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Uses of Liquidity

Our principal uses of liquidity include the following:

• accretive property investment;

• leasing/capital costs;

• dividends and distributions to shareholders and unitholders;

• long-term debt maturities;

• opportunistic repurchases of outstanding debt and preferred stock; and

• other contractual obligations.

Property Investment

We continue to pursue an asset repositioning strategy that involves increasing our investment concentration in industrial and medical office properties while reducing our investment concentration in suburban office properties. Pursuant to this strategy, we evaluate development and acquisition opportunities based upon market outlook, supply and long-term growth potential. Our ability to make future property investments, along with being dependent upon identifying suitable acquisition and development opportunities, is also dependent upon our continued access to our longer-term sources of liquidity, including issuances of debt or equity securities as well as generating cash flow by disposing of selected properties.

In light of current economic conditions, management continues to evaluate our investment priorities and remains focused on long-term accretive growth.

Leasing/Capital Costs

Tenant improvements and leasing commissions related to the initial leasing of newly completed or acquired properties are referred to as first generation expenditures. Such expenditures are included within development of real estate investments and other deferred leasing costs in our Consolidated Statements of Cash Flows.

Tenant improvements and leasing costs to re-let rental space that had been previously under lease to tenants are referred to as second generation expenditures. Building improvements that are not specific to any tenant but serve to improve integral components of our real estate properties are also second generation expenditures.

One of the principal uses of our liquidity is to fund the second generation leasing/capital expenditures of our real estate investments.

The following is a summary of our second generation capital expenditures by type of expenditure (in thousands):

	Three Months Ended March 31,
	2012		2011
Second generation tenant improvements	$	6,346	$	7,989
Second generation leasing costs	8,338		8,554
Building improvements	677		933
Totals	$	15,361	$	17,476

The following is a summary of our second generation capital expenditures by reportable operating segment (in thousands):

	Three Months Ended March 31,
	2012		2011
Industrial	$	8,289	$	7,461
Office	6,882		9,914
Medical Office	163		101
Non-reportable segments	27		—
Totals	$	15,361	$	17,476

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Both our first and second generation expenditures vary significantly between leases on a per square foot basis, dependent upon several factors including the product type, nature of a tenant's operations, the specific physical characteristics of each individual property as well as the market in which the property is located.

Dividend and Distribution Requirements

We are required to meet the distribution requirements of the Internal Revenue Code of 1986, as amended (the “Code”), in order to maintain our REIT status. Because depreciation is a non-cash expense, cash flow will typically be greater than operating income. We paid distributions of $0.17 per common share in the first quarter of 2012 and our board of directors declared dividends of $0.17 per share for the second quarter of 2012. Our future dividends will be declared at the discretion of our board of directors and will be subject to our future capital needs and availability.

At March 31, 2012, we had four series of preferred stock outstanding. The annual dividend rates on our preferred shares range between 6.5% and 8.375% and are paid in arrears quarterly. In March 2012, we redeemed all of our 6.95% Series M Cumulative Redeemable Preferred Shares (“Series M Shares”) for a total payment of $168.3 million, thus reducing our future quarterly dividend commitments by $2.9 million.

Debt Maturities

Debt outstanding at March 31, 2012 had a face value totaling $3.8 billion with a weighted average interest rate of 6.42% and matures at various dates through 2028. Of this total amount, we had $2.6 billion of unsecured debt, $20.3 million outstanding on the unsecured line of credit of a consolidated subsidiary and $1.2 billion of secured debt outstanding at March 31, 2012. Scheduled principal amortization and maturities of such debt totaled $10.9 million for the three months ended March 31, 2012.

The following is a summary of the scheduled future amortization and maturities of our indebtedness at March 31, 2012 (in thousands, except percentage data):

	Future Repayments
Year	Scheduled Amortization		Maturities		Total		Weighted Average Interest Rate of Future Repayments
Remainder of 2012	$	12,957	$	330,071	$	343,028	5.31	%
2013	16,730		521,644		538,374		6.27	%
2014	15,590		301,000		316,590		6.16	%
2015	14,015		358,381		372,396		6.81	%
2016	12,001		506,690		518,691		6.11	%
2017	9,908		544,932		554,840		5.95	%
2018	7,937		300,000		307,937		6.08	%
2019	6,936		518,438		525,374		7.97	%
2020	5,381		250,000		255,381		6.73	%
2021	3,416		9,047		12,463		5.59	%
2022	3,611		—		3,611		5.57	%
Thereafter	14,178		50,000		64,178		6.93	%
	$	122,660	$	3,690,203	$	3,812,863	6.42	%

We anticipate generating capital to fund our debt maturities by using undistributed cash generated from our Rental Operations and property dispositions, and by raising additional capital from future debt or equity transactions.

Repurchases of Outstanding Debt and Preferred Stock

We paid $168.3 million in March 2012 to redeem our Series M Shares at par value.

To the extent that it supports our overall capital strategy, we may purchase certain of our outstanding unsecured debt prior to its stated maturity or redeem or repurchase certain of our outstanding series of preferred stock.

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Historical Cash Flows

Cash and cash equivalents were $14.7 million and $167.1 million at March 31, 2012 and 2011, respectively. The following highlights significant changes in net cash associated with our operating, investing and financing activities (in millions):

	Three Months Ended March 31,
	2012			2011
Net Cash Provided by Operating Activities	$	25.3		$	28.0
Net Cash Provided by (Used for) Investing Activities	$	(137.6	)	$	405.6
Net Cash Used for Financing Activities	$	(86.8	)	$	(284.9	)

Operating Activities

The receipt of rental income from Rental Operations continues to be our primary source of operating cash flows. For the three months ended March 31, 2012, cash provided by operating activities decreased to $25.3 million from $28.0 million in the same period in 2011.

Investing Activities

Investing activities are one of the primary uses of our liquidity. Development and acquisition activities typically generate additional rental revenues and provide cash flows for operational requirements. Highlights of significant cash sources and uses are as follows:

• During the three months ended March 31, 2012, we paid cash of $131.5 million for real estate acquisitions and $12.2 million for undeveloped land acquisitions, compared to $22.3 million for real estate acquisitions in the same period in 2011.

• Real estate development costs decreased to $29.6 million for three months ended March 31, 2012 from $37.3 million for the same period in 2011. The change in development activity is consistent with our strategy to limit new development starts to properties with significant pre-leasing or in product lines and markets that we believe will provide future growth.

• Sales of land and depreciated property provided $63.3 million in net proceeds for the three months ended March 31, 2012, compared to $437.5 million for the same period in 2011.

• During the three months endedMarch 31, 2011, we received a $54.7 million cash distribution, which represented our share of the net proceeds from a loan obtained by one of our unconsolidated joint ventures. We received no such capital distributions from unconsolidated companies during the same period in 2012.

Financing Activities

The following items highlight some of the factors that account for the difference in net cash flow related to financing activities in the first three months of 2012 compared to the same period in 2011:

• In March 2012, we redeemed all of the outstanding shares of our Series M Shares for a total payment of $168.3 million.

• During the three months ended March 31, 2012, we issued 10.8 million shares of common stock for net proceeds of $147.0 million.

• In March 2011, we repaid $42.5 million of senior unsecured notes with an effective rate of 6.96% on their scheduled maturity date.

• For the three months ended March 31,2011, we decreased net borrowings on DRLP’s $850.0 million line of credit by $175.0 million, completely repaying the outstanding balance, compared to no net change in borrowings for the same period in 2012.

Contractual Obligations

Aside from changes in long-term debt, there have not been material changes in our outstanding commitments since December 31, 2011, as previously discussed in our 2011 Annual Report on Form 10-K.

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Off Balance Sheet Arrangements - Investments in Unconsolidated Companies

We analyze our investments in unconsolidated joint ventures to determine if they meet the criteria for classification as a variable interest entity (a “VIE”) and would require consolidation. We (i) evaluate the sufficiency of the total equity at risk, (ii) review the voting rights and decision-making authority of the equity investment holders as a group, and whether there are any guaranteed returns, protection against losses, or capping of residual returns within the group and (iii) establish whether activities within the venture are on behalf of an investor with disproportionately few voting rights in making this VIE determination. We would consolidate a venture that is determined to be a VIE if we were the primary beneficiary. To the extent that our joint ventures do not qualify as VIEs, we further assess each joint venture partner’s substantive participating rights to determine if the venture should be consolidated.

We have equity interests in unconsolidated partnerships and limited liability companies that primarily own and operate rental properties and hold land for development. These unconsolidated joint ventures are primarily engaged in the operations and development of industrial, office and medical office real estate properties. These investments provide us with increased market share and tenant and property diversification. The equity method of accounting is used for these investments in which we have the ability to exercise significant influence, but not control, over operating and financial policies. As a result, the assets and liabilities of these entities are not included on our balance sheet. Our investments in and advances to unconsolidated subsidiaries represented approximately 5% of our total assets as of both March 31, 2012 and December 31, 2011. Total assets of our unconsolidated subsidiaries were $2.5 billion and $2.6 billion as of March 31, 2012 and December 31, 2011, respectively. The combined revenues of our unconsolidated subsidiaries totaled $72.0 million and $57.2 million for the three months ended March 31, 2012 and 2011, respectively.

We have guaranteed the repayment of certain secured and unsecured loans of our unconsolidated subsidiaries and the outstanding balances on the guaranteed portion of these loans totaled $220.9 million at March 31, 2012.

Item 3.    Quantitative and Qualitative Disclosures About Market Risk

We are exposed to interest rate changes primarily as a result of our line of credit and our long-term borrowings. Our interest rate risk management objective is to limit the impact of interest rate changes on earnings and cash flows and to lower overall borrowing costs. To achieve our objectives, we borrow primarily at fixed rates. We do not enter into derivative or interest rate transactions for speculative purposes. We have one outstanding swap, which has a fixed rate on one of our variable rate loans; it is not significant to our Financial Statements in terms of notional amount or fair value at March 31, 2012.

Our interest rate risk is monitored using a variety of techniques. The table below presents the principal amounts (in thousands) of the expected annual maturities, weighted average interest rates for the average debt outstanding in the specified period, fair values (in thousands) and other terms required to evaluate the expected cash flows and sensitivity to interest rate changes.

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	Remainder of 2012			2013			2014			2015			2016			Thereafter			Face Value		Fair Value
Fixed rate secured debt	$	99,510		$	110,529		$	63,563		$	119,870		$	366,021		$	411,419		$	1,170,912	$	1,263,223
Weighted average interest rate	5.96		%	5.84		%	5.56		%	5.38		%	5.86		%	7.07		%
Variable rate secured debt	$	830		$	880		$	935		$	300		$	300		$	2,800		$	6,045	$	6,045
Weighted average interest rate	0.28		%	0.29		%	0.29		%	0.19		%	0.19		%	0.19		%
Fixed rate unsecured debt	$	201,395		$	426,965		$	252,092		$	252,226		$	152,370		$	1,309,565		$	2,594,613	$	2,872,433
Weighted average interest rate	5.87		%	6.40		%	6.33		%	7.49		%	6.71		%	6.65		%
Variable rate unsecured notes	$	21,000		$	—		$	—		$	—		$	—		$	—		$	21,000	$	20,953
Rate at March 31, 2012	1.09		%	N/A			N/A			N/A			N/A			N/A
Unsecured lines of credit	$	20,293		$	—		$	—		$	—		$	—		$	—		$	20,293	$	20,248
Rate at March 31, 2012	1.09		%	N/A			N/A			N/A			N/A			N/A

As the above table incorporates only those exposures that exist as of March 31, 2012, it does not consider those exposures or positions that could arise after that date. As a result, our ultimate realized gain or loss with respect to interest rate fluctuations will depend on the exposures that arise during the period, our hedging strategies at that time to the extent we are party to interest rate derivatives and interest rates. Interest expense on our unsecured lines of credit will be affected by fluctuations in the LIBOR indices as well as changes in our credit rating. The interest rate at such point in the future as we may renew, extend or replace our unsecured lines of credit will be heavily dependent upon the state of the credit environment.

Item 4.    Controls and Procedures

(a) Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934, as amended, is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. These disclosure controls and procedures are further designed to ensure that such information is accumulated and communicated to management, including the Chief Executive Officer and the Chief Financial Officer, to allow timely decisions regarding required disclosure.

We carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Exchange Act Rules 13a-15 and 15d-15. Based upon the foregoing, the Chief Executive Officer and the Chief Financial Officer concluded that, as of the end of the period covered by this Report, our disclosure controls and procedures are effective in all material respects.

(b) Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting during the period covered by this Report that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Part II - Other Information

Item 1. Legal Proceedings

From time to time, we are parties to a variety of legal proceedings and claims arising in the ordinary course of our businesses. While these matters generally are covered by insurance, there is no assurance that our insurance will cover any particular proceeding or claim. We presently believe that all of these proceedings to which we were subject as of March 31, 2012, taken as a whole, will not have a material adverse effect on our liquidity, business, financial condition or results of operations.

Item 1A. Risk Factors

In addition to the information set forth in this Report, you also should carefully review and consider the information contained in our other reports and periodic filings that we make with the SEC, including, without limitation the information contained under the caption “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2011. The risks and uncertainties described in our 2011 Annual Report on Form 10-K are not the only risks that we face. Additional risks and uncertainties not currently known to us, or that we presently deem to be immaterial, also may materially adversely affect our business, financial condition and results of operations.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(a) Unregistered Sales of Equity Securities

None

(b) Use of Proceeds

None

(c) Issuer Purchases of Equity Securities

From time to time, we repurchase our securities under a repurchase program that initially was approved by the board of directors and publicly announced in October 2001 (the “Repurchase Program”).

The following table shows the share repurchase activity for the three months in the quarter ended March 31, 2012: 

Month	Total Number of Shares Purchased		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Dollar Value of Shares That May Yet be Repurchased Under the Plan (1)
January 1 - 31, 2012	4,136		$	12.57	4,136	74,288,186
February 1 - 29, 2012	12,674		$	13.88	12,674	74,112,271
March 1 - 31, 2012	3,026		$	14.24	3,026	74,069,181
Total	19,836	(2)	$	13.66	19,836

(1) On April 25, 2012, the board of directors adopted a resolution that amended and restated the Repurchase Program and delegated authority to management to repurchase a maximum of $100.0 million of common shares, $300.0 million of debt securities and $150.0 million of preferred shares (the “April 2012 Resolution”). The April 2012 Resolution will expire on April 25, 2013.

(2) Common shares repurchased in connection with our Employee Stock Purchase Plan, a component of our Repurchase Program.

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Item 3. Defaults upon Senior Securities

During the period covered by this Report, we did not default under the terms of any of our material indebtedness, nor has there been any material arrearage of dividends or other material uncured delinquency with respect to any class of our preferred shares. 

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

During the period covered by this Report, there was no information required to be disclosed by us in a Current Report on Form 8-K that was not so reported, nor were there any material changes to the procedures by which our security holders may recommend nominees to our board of directors.

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Item 6. Exhibits

(a) Exhibits

3.1(i)	Fourth Amended and Restated Articles of Incorporation of the Company (filed as Exhibit 3.1 to the Company’s Current Report on Form 8-K as filed with the SEC on July 30, 2009, and incorporated herein by this reference).
3.1(ii)	Amendment to the Fourth Amended and Restated Articles of Incorporation of the Company (filed as Exhibit 3.1 to the Company’s Current Report on Form 8-K as filed with the SEC on July 22, 2011, and incorporated herein by this reference).
3.1(iii)	Second Amendment to the Fourth Amended and Restated Articles of Incorporation of the Company (filed as Exhibit 3.1 to the Company's Current Report on Form 8-K as filed with the SEC on March 9, 2012, and incorporated herein by this reference).
3.2	Fourth Amended and Restated Bylaws of the Company (filed as Exhibit 3.2 to the Company’s Current Report on Form 8-K as filed with the SEC on July 30, 2009, and incorporated herein by this reference).
10.1(i)	Fourth Amended and Restated Agreement of Limited Partnership of DRLP (filed as Exhibit 3.1 to DRLP’s Current Report on Form 8-K as filed with the SEC on November 3, 2009, and incorporated herein by this reference).
10.1(ii)	Amendment to Fourth Amended and Restated Agreement of Limited Partnership of DRLP (filed as Exhibit 3.1 to DRLP’s Current Report on Form 8-K, as filed with the SEC on July 22, 2011, and incorporated herein by this reference).
10.1(iii)	Second Amendment to Fourth Amended and Restated Agreement of Limited Partnership of DRLP (filed as Exhibit 3.1 to DRLP's Current Report on Form 8-K as filed with the SEC on March 9, 2012 and incorporated herein by this reference).
11.1	Statement Regarding Computation of Earnings.***
12.1	Statement of Computation of Ratio of Earnings to Fixed Charges and Ratio of Earnings to Combined Fixed Charges and Preferred Dividends.*
31.1	Rule 13a-14(a) Certification of the Chief Executive Officer.*
31.2	Rule 13a-14(a) Certification of the Chief Financial Officer.*
32.1	Section 1350 Certification of the Chief Executive Officer.**
32.2	Section 1350 Certification of the Chief Financial Officer.**
101	The following materials from Duke Realty Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2012 formatted in XBRL (eXtensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations and Comprehensive Income, (iii) the Consolidated Statements of Cash Flows, (iv) the Consolidated Statement of Changes in Equity, (v) the Notes to Consolidated Financial Statements.

* Filed herewith.

** The certifications attached as Exhibits 32.1 and 32.2 accompany this Quarterly Report on Form 10-Q and are “furnished” to the Securities and Exchange Commission pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed “filed” by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

*** Data required by Financial Accounting Standards Board Auditing Standards Codification No. 260 is provided in Note 8 to the Consolidated Financial Statements included in this report.

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SIGNATURES

Pursuant to the requirements 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.

		DUKE REALTY CORPORATION
Date:	May 4, 2012	/s/ Dennis D. Oklak
		Dennis D. Oklak
		Chairman and Chief Executive Officer
		/s/ Christie B. Kelly
		Christie B. Kelly
		Executive Vice President and Chief Financial Officer
		/s/ Mark A. Denien
		Mark A. Denien
		Senior Vice President and Chief Accounting Officer

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EX-12.1

EXHIBIT 12.1

DUKE REALTY CORPORATION

CALCULATION OF RATIO OF EARNINGS TO FIXED CHARGES AND RATIO OF EARNINGS TO

COMBINED FIXED CHARGES AND PREFERRED DIVIDENDS

(in thousands, except ratios)

	Three Months Ended March 31, 2012				Year Ended December 31, 2011				Year Ended December 31, 2010				Year Ended December 31, 2009				Year Ended December 31, 2008			Year Ended December 31, 2007
Net income (loss) from continuing operations, less preferred dividends	$	(37,030	)		$	(64,154	)		$	(30,476	)		$	(313,445	)		$	18,305		$	112,176
Preferred dividends	13,193				60,353				69,468				73,451				71,426			58,292
Interest expense	61,086				222,203				188,136				150,586				135,865			110,979
Earnings (loss) before fixed charges	$	37,249			$	218,402			$	227,128			$	(89,408	)		$	225,596		$	281,447
Interest expense	$	61,086			$	222,203			$	188,136			$	150,586			$	135,865		$	110,979
Interest costs capitalized	1,309				4,335				11,498				26,864				53,456			59,167
Total fixed charges	62,395				226,538				199,634				177,450				189,321			170,146
Preferred dividends	13,193				60,353				69,468				73,451				71,426			58,292
Total fixed charges and preferred dividends	$	75,588			$	286,891			$	269,102			$	250,901			$	260,747		$	228,438
Ratio of earnings to fixed charges	N/A			(1)	N/A			(3)	1.14				N/A			(6)	1.19			1.65
Ratio of earnings to fixed charges and preferred dividends	N/A			(2)	N/A			(4)	N/A			(5)	N/A			(7)	N/A		(8)	1.23

(1) N/A - The ratio is less than 1.0; deficit of $25.1 million exists for the three months ended March 31, 2012. The calculation of earnings includes $91.6 million of non-cash depreciation expense.

(2) N/A - The ratio is less than 1.0; deficit of $38.3 million exists for the three months ended March 31, 2012. The calculation of earnings includes $91.6 million of non-cash depreciation expense.

(3) N/A - The ratio is less than 1.0; deficit of $8.1 million exists for the year ended December 31, 2011. The calculation of earnings includes $329.2 million of non-cash depreciation expense.

(4) N/A - The ratio is less than 1.0; deficit of $68.5 million exists for the year ended December 31, 2011. The calculation of earnings includes $329.2 million of non-cash depreciation expense.

(5) N/A - The ratio is less than 1.0; deficit of $42.0 million exists for the year ended December 31, 2010. The calculation of earnings includes $278.3 million of non-cash depreciation expense.

(6) N/A - The ratio is less than 1.0; deficit of $266.9 million exists for the year ended December 31, 2009. The calculation of earnings includes $244.1 million of non-cash depreciation expense.

(7) N/A - The ratio is less than 1.0; deficit of $340.3 million exists for the year ended December 31, 2009. The calculation of earnings includes $244.1 million of non-cash depreciation expense.

(8) N/A - The ratio is less than 1.0; deficit of $35.2 million exists for the year ended December 31, 2008. The calculation of earnings includes $211.9 million of non-cash depreciation expense.

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

I, Dennis D. Oklak, certify that:

1 I have reviewed this Quarterly Report on Form 10-Q of Duke Realty Corporation;

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 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 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: May 4, 2012

/s/ Dennis D. Oklak

Dennis D. Oklak

Chairman and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

I, Christie B. Kelly, certify that:

1 I have reviewed this Quarterly Report on Form 10-Q of Duke Realty Corporation;

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 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 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: May 4, 2012

/s/ Christie B. Kelly

Christie B. Kelly

Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Realty Corporation (the “Company”) on Form 10-Q for the quarter ending March 31, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis D. Oklak, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(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/ Dennis D. Oklak
Dennis D. Oklak
Chairman and Chief Executive Officer
Date:	May 4, 2012

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Duke Realty Corporation, and will be retained by Duke Realty Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Realty Corporation (the “Company”) on Form 10-Q for the quarter ending March 31, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Christie B. Kelly, Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(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/ Christie B. Kelly
Christie B. Kelly
Executive Vice President and Chief Financial Officer
Date:	May 4, 2012

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Duke Realty Corporation, and will be retained by Duke Realty Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

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Segment Reporting (Summary on Revenues and Funds from Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Rental and related revenue	$ 203,432	$ 190,986
General contractor and service fee revenue (''Service Operations'')	68,968	146,547
Total Segment Revenues	271,271	335,550
Consolidated Revenue from continuing operations	272,400	337,533
Discontinued Operations	1,234	52,170
Consolidated Revenue	273,634	389,703
Net earnings excluding depreciation and Non-Segment Items	142,114	132,718
Interest expense	(61,086)	(52,124)
Interest and other income	146	87
Other operating expenses	(265)	(85)
General and administrative expenses	(11,839)	(11,197)
Undeveloped land carrying costs	(2,298)	(2,309)
Acquisition-related activity	(580)	(589)
Other non-segment income	352	981
Net (income) loss attributable to noncontrolling interests	643	(1,083)
Noncontrolling interest share of FFO adjustments	(2,060)	(569)
Joint venture items	10,095	8,610
Dividends on preferred shares	(13,193)	(15,974)
Adjustments for redemption/repurchase of preferred shares	(5,730)	(163)
Discontinued operations	(106)	11,756
FFO attributable to common shareholders	56,193	70,059
Depreciation and amortization on continuing operations	(91,613)	(77,822)
Depreciation and amortization on discontinued operations	(643)	(17,159)
Company's share of joint venture adjustments	(8,586)	(7,628)
Earnings from depreciated property sales on continuing operations	(277)	67,856
Earnings from depreciated property sales on discontinued operations	6,476	11,603
Earnings from depreciated property sales - share of joint venture	0	91
Noncontrolling Interest Share of FFO Adjustments, Reconciliation Add-Back	2,060	569
Net income (loss) attributable to common shareholders	(36,390)	47,569
Industrial [Member]
Rental and related revenue	108,487	94,262
Net earnings excluding depreciation and Non-Segment Items	79,902	66,726
Office [Member]
Rental and related revenue	67,417	75,602
Net earnings excluding depreciation and Non-Segment Items	39,490	43,100
Medical Office [Member]
Rental and related revenue	20,741	13,484
Net earnings excluding depreciation and Non-Segment Items	13,667	7,802
Non-reportable Rental Operations segments [Member]
Rental and related revenue	5,658	5,655
Net earnings excluding depreciation and Non-Segment Items	4,008	4,207
Other Revenue [Member]
Rental and related revenue	1,129	1,983
Service Operations [Member]
Net earnings excluding depreciation and Non-Segment Items	$ 5,047	$ 10,883

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Indebtedness (Summary of Book Value and Changes in Fair Value of Debt) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Book value	$ 3,816,870	$ 3,809,589
Fair value	4,182,902	4,117,230
Issuances and assumptions	18,741
Payoffs	(11,460)
Adjustments to fair value	58,391
Fixed Rate Secured Debt [Member]
Book value	1,174,920	1,167,188
Fair value	1,263,223	1,256,331
Issuances and assumptions	18,741
Payoffs	(11,009)
Adjustments to fair value	(840)
Variable Rate Secured Debt [Member]
Book value	6,045	6,045
Fair value	6,045	6,045
Issuances and assumptions	0
Payoffs	0
Adjustments to fair value	0
Unsecured Debt [Member]
Book value	2,615,612	2,616,063
Fair value	2,893,386	2,834,610
Issuances and assumptions	0
Payoffs	(451)
Adjustments to fair value	59,227
Unsecured Lines Of Credit [Member]
Book value	20,293	20,293
Fair value	20,248	20,244
Issuances and assumptions	0
Payoffs	0
Adjustments to fair value	$ 4

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Discontinued Operations and Assets Held for Sale (Tables)

3 Months Ended

Mar. 31, 2012

Discontinued Operations and Disposal Groups [Abstract]

Table Illustration of Number of Properties in Discontinued Operations

	Held for Sale at March 31, 2012	Sold in 2012	Sold in 2011	Total
Office	0	7	93	100
Industrial	2	6	7	15
Retail	1	0	1	2
	3	13	101	117

Table Illustration of Discontinued Operations in Income Statement

	Three Months Ended March 31,
	2012			2011
Revenues	$	1,234		$	52,170
Operating expenses	(815		)	(25,273		)
Depreciation and amortization	(643		)	(17,159		)
Operating income (loss)	(224		)	9,738
Interest expense	(525		)	(15,141		)
Loss before gain on sales	(749		)	(5,403		)
Gain on sale of depreciable properties	6,476			11,603
Income from discontinued operations	$	5,727		$	6,200

Allocation of Common Shareholders' Income (Loss) Between Continuing and Discontinued Operations

	Three Months Ended March 31,
	2012			2011
Income (loss) from continuing operations attributable to common shareholders	$	(41,992	)	$	41,522
Income from discontinued operations attributable to common shareholders	5,602			6,047
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569

Schedule of Discontinued Operations, Properties Held-for-Sale, Aggregate Balance Sheet Information [Table Text Block]

Real estate investment, net	$	18,159
Other assets	1,236
Total assets held-for-sale	$	19,395
Accrued expenses	$	434
Other liabilities	209
Total liabilities held-for-sale	$	643

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Discontinued Operations and Assets Held for Sale (Table Illustration of Discontinued Operations in Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Discontinued Operations
Revenues	$ 1,234	$ 52,170
Operating expenses	(815)	(25,273)
Depreciation and amortization on discontinued operations	(643)	(17,159)
Operating income (loss)	(224)	9,738
Interest expense	(525)	(15,141)
Loss before gain on sales	(749)	(5,403)
Gain on sale of depreciable properties	6,476	11,603
Income from discontinued operations	$ 5,727	$ 6,200

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Net Income (Loss) Per Common Share (Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income (loss) attributable to common shareholders	$ (36,390)	$ 47,569
Less: Dividends on participating securities	(852)	(799)
Basic net income (loss) attributable to common shareholders	(37,242)	46,770
Noncontrolling interest in earnings of common unitholders	0	1,205
Diluted net income (loss) attributable to common shareholders	$ (37,242)	$ 47,975
Weighted average number of common shares outstanding	258,365	252,406
Weighted average partnership Units outstanding	0	6,384
Other potential dilutive shares	0	47
Weighted average number of common shares and potential dilutive securities	258,365	258,837
3.75% Exchangeable Senior Notes [Member]
Interest rate stated on the debt instrument	3.75%

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Reclassifications

3 Months Ended

Mar. 31, 2012

Reclassifications [Abstract]

Reclassifications

Reclassifications

Certain amounts in the accompanying consolidated financial statements for 2011 have been reclassified to conform to the 2012 consolidated financial statement presentation.

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Discontinued Operations and Assets Held for Sale (Allocation of Shareholders' Income (Loss) Between Continuing and Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Discontinued Operations
Income (loss) from continuing operations attributable to common shareholders	$ (41,992)	$ 41,522
Income from discontinued operations attributable to common shareholders	5,602	6,047
Net income (loss) attributable to common shareholders	$ (36,390)	$ 47,569

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Acquisitions and Dispositions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Proceeds from land and depreciated property sales, net	$ 63,281	$ 437,494
Other 2012 Acquisitions [Member] [Domain]
Number of real estate properties acquired	7
Weighted average remaining life of property (years)	8.7
Medical Office Properties [Member] | Other 2012 Acquisitions [Member] [Domain]
Number of real estate properties acquired	4
Columbus Ohio [Member] | Industrial Buildings [Member] | Other 2012 Acquisitions [Member] [Domain]
Number of real estate properties acquired	2
Chicago Illinois [Member] | Industrial Buildings [Member] | Other 2012 Acquisitions [Member] [Domain]
Number of real estate properties acquired	1

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Variable Interest Entities (Balances Related to Joint Ventures) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 entities
Variable Interest Entities [Abstract]
Number of Unconsolidated Joint Ventures Considered Variable Interest Entities	3
Carrying Value of Investment in Unconsolidated Companies	$ 33.5
Maximum Loss Exposure from Investment in Unconsolidated Companies	33.5
Carrying Value of Guarantee Obligations	(16.6)	[1]
Maximum Loss Exposure from Guarantee Obligations	$ (55.9)	[1]

[1] We are party to guarantees of the third-party debt of these joint ventures and our maximum loss exposure is equal to the maximum monetary obligation pursuant to the guarantee agreements. We have recorded a liability for our probable future obligation under a guarantee to the lender of one of these ventures. Pursuant to an agreement with the lender, we may make partner loans to this joint venture that will reduce our maximum guarantee obligation on a dollar-for-dollar basis. The carrying value of our recorded guarantee obligations is included in other liabilities in our Consolidated Balance Sheets.

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Discontinued Operations and Assets Held for Sale (Aggregate Balance Sheet of Properties Held for Sale Included in Discontinued Operations) (Details) (In-service Properties Reclassified to Discontinued Operations Held-for-sale [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
In-service Properties Reclassified to Discontinued Operations Held-for-sale [Member]
Discontinued Operations
Real estate investment, net	$ 18,159
Other assets	1,236
Total assets held-for-sale	19,395
Accrued expenses	434
Other liabilities	209
Total liabilities held-for-sale	$ 643

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Acquisitions and Dispositions (Summary of Allocation of Fair Value of Amounts Recognized) (Details) (Other 2012 Acquisitions [Member] [Domain], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Other 2012 Acquisitions [Member] [Domain]
Real estate assets	$ 130,615
Lease-related intangible assets	22,451
Other assets	2,829
Total acquired assets	155,895
Secured debt	18,741
Other liabilities	885
Total assumed liabilities	19,626
Fair value of acquired net assets	$ 136,269

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Acquisitions and Dispositions (Summary of Significant Assumptions Utilized in Estimates) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012 months
Minimum [Member]
Discount rate	7.19%
Exit capitalization rate	6.09%
Lease-up period (months)	9
Minimum [Member] | Industrial Buildings [Member]
Rental rate per square foot	2.75
Minimum [Member] | Medical Office Properties [Member]
Rental rate per square foot	16.10
Maximum [Member]
Discount rate	8.78%
Exit capitalization rate	7.40%
Lease-up period (months)	19
Maximum [Member] | Industrial Buildings [Member]
Rental rate per square foot	3.59
Maximum [Member] | Medical Office Properties [Member]
Rental rate per square foot	26.14

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General Basis of Presentation

3 Months Ended

Mar. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

General Basis of Presentation

General Basis of Presentation

The interim consolidated financial statements included herein have been prepared by Duke Realty Corporation (the “Company”). The 2011 year-end consolidated balance sheet data included in this Quarterly Report on Form 10-Q (this “Report”) was derived from the audited financial statements in our Annual Report on Form 10-K for the year ended December 31, 2011, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). The financial statements have been prepared in accordance with GAAP for interim financial information and in accordance with Rule 10-01 of Regulation S-X of the Securities Exchange Act of 1934, as amended. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenue and expenses during the reporting period. Our actual results could differ from those estimates and assumptions. These financial statements should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations included herein and the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2011.

We believe that we qualify as a real estate investment trust (“REIT”) under the provisions of the Internal Revenue Code of 1986, as amended (the “Code”). Substantially all of our Rental Operations (see Note 9) are conducted through Duke Realty Limited Partnership (“DRLP”). We owned approximately 98.3% of the common partnership interests of DRLP (“Units”) at March 31, 2012. At the option of the holders, and subject to certain restrictions, the remaining Units are redeemable for shares of our common stock on a one-to-one basis and earn dividends at the same rate as shares of our common stock. If it is determined to be necessary in order to continue to qualify as a REIT, we may elect to purchase the Units for an equivalent amount of cash rather than issuing shares of common stock upon redemption. We conduct our Service Operations (see Note 9) through Duke Realty Services, LLC, Duke Realty Services Limited Partnership and Duke Construction Limited Partnership (“DCLP”), which are consolidated entities that are 100% owned by a combination of us and DRLP. DCLP is owned through a taxable REIT subsidiary. The consolidated financial statements include our accounts and the accounts of our majority-owned or controlled subsidiaries. In this Report, unless the context indicates otherwise, the terms “we,” “us” and “our” refer to the Company and those entities owned or controlled by the Company.

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Indebtedness (Narrative) (Details) (USD $)			3 Months Ended			3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Fixed Rate Secured Debt [Member] years loans	Mar. 31, 2012 Fixed Rate Unsecured Debt [Member]	Mar. 31, 2012 Variable Rate Unsecured Debt [Member]	Mar. 31, 2012 Unsecured Line of Credit - DRLP [Member]	Mar. 31, 2012 Unsecured Line of Credit - Consolidated Subsidiary [Member]	Mar. 31, 2012 Other 2012 Acquisitions [Member] [Domain]
Estimated rate of fixed rate secured debt, minimum			3.50%
Estimated rate of fixed rate secured debt, maximum			5.40%
Secured loans acquired			1
Face value from acquisition			$ 18,100,000
Business Acquisition, Purchase Price Allocation, Noncurrent Liabilities, Long-term Debt								18,741,000
Assumed weighted average interest rate			5.14%
Weighted average remaining term (years)			2.2
Estimated effective interest rate of loan			3.50%
Unsecured notes	2,615,612,000	2,616,063,000			21,000,000
Estimated trading value of fixed rate unsecured debt, minimum percentage				102.00%
Estimated trading value of fixed rate unsecured debt, maximum percentage				124.00%
Debt instrument covenant compliance				We were in compliance with all such covenants as of March 31, 2012		we were in compliance with all covenants under this line of credit.
Borrowing capacity of unsecured lines of credit						850,000,000	30,000,000
Spread over LIBOR						1.25%	0.85%
Line of credit balance						0	20,293,000
Interest rate on borrowings							1.09%
Maturity date of unsecured line of credit						December 2015	July 2012
Additional borrowings under unsecured lines of credit						400,000,000
Maximum borrowing capacity of unsecured lines of credit						$ 1,250,000,000
Current market rate of unsecured lines of credit							1.74%

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Segment Reporting (Reportable Segments Consolidated Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Total Segment Assets	$ 6,357,526	$ 6,285,061
Non-Segment Assets	514,879	719,376
Assets	6,872,405	7,004,437
Industrial [Member]
Reportable Segment Assets	3,634,930	3,586,250
Office [Member]
Reportable Segment Assets	1,683,691	1,742,196
Medical Office [Member]
Reportable Segment Assets	674,298	580,177
Non-reportable Rental Operations segments [Member]
Reportable Segment Assets	202,139	209,056
Service Operations [Member]
Reportable Segment Assets	$ 162,468	$ 167,382

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
ASSETS
Land and improvements	$ 1,209,840	$ 1,202,872
Buildings and tenant improvements	4,868,066	4,766,793
Construction in progress	80,306	44,259
Investments in and advances to unconsolidated companies	361,818	364,859
Undeveloped land	622,642	622,635
Real estate investment property, at cost, total	7,142,672	7,001,418
Accumulated depreciation	(1,151,322)	(1,108,650)
Net real estate investments	5,991,350	5,892,768
Real estate investments and other assets held-for-sale	19,395	55,580
Cash and cash equivalents	14,740	213,809
Accounts receivable, net of allowance of $2,693 and $3,597	24,045	22,255
Straight-line rent receivable, net of allowance of $6,997 and $7,447	111,115	105,900
Receivables on construction contracts, including retentions	33,257	40,247
Deferred financing costs, net of accumulated amortization of $42,720 and $59,109	39,685	42,268
Deferred leasing and other costs, net of accumulated amortization of $311,525 and $292,334	469,936	460,881
Escrow deposits and other assets	168,882	170,729
Assets, total	6,872,405	7,004,437
LIABILITIES AND EQUITY
Secured debt	1,180,965	1,173,233
Unsecured notes	2,615,612	2,616,063
Unsecured lines of credit	20,293	20,293
Long-term debt, total	3,816,870	3,809,589
Liabilities related to real estate investments held-for-sale	643	975
Construction payables and amounts due subcontractors, including retentions	51,309	55,775
Accrued real estate taxes	76,263	69,272
Accrued interest	33,675	58,904
Other accrued expenses	29,058	60,174
Other liabilities	132,734	131,735
Tenant security deposits and prepaid rents	46,383	38,355
Total liabilities	4,186,935	4,224,779
Shareholders' equity:
Preferred shares ($.01 par value); 5,000 shares authorized; 2,503 and 3,176 shares issued and outstanding	625,638	793,910
Common shares ($.01 par value); 400,000 shares authorized; 266,405 and 252,927 shares issued and outstanding	2,664	2,529
Additional paid-in capital	3,780,293	3,594,588
Accumulated other comprehensive income	1,506	987
Distributions in excess of net income	(1,758,467)	(1,677,328)
Total shareholders' equity	2,651,634	2,714,686
Noncontrolling interests	33,836	64,972
Total equity	2,685,470	2,779,658
Liabilities and stockholders' equity, total	$ 6,872,405	$ 7,004,437

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Subsequent Events (Details) (Declaration of Dividends [Member], USD $)	3 Months Ended
	Mar. 31, 2012
Subsequent Event [Line Items]
Declared date	Apr. 25, 2012
Common Stock [Member]
Subsequent Event [Line Items]
Common stock dividends declared per share	0.17
Record date	May 16, 2012
Payment date	May 31, 2012
Series J Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred stock dividends declared per share	0.414063
Record date	May 16, 2012
Payment date	May 31, 2012
Series K Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred stock dividends declared per share	0.406250
Record date	May 16, 2012
Payment date	May 31, 2012
Series L Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred stock dividends declared per share	0.412500
Record date	May 16, 2012
Payment date	May 31, 2012
Series O Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred stock dividends declared per share	0.523437
Record date	Jun. 15, 2012
Payment date	Jul. 02, 2012

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Consolidated Statement of Changes in Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Distributions in Excess of Net Income [Member]	Non-controlling Interest [Member]
Balance at Dec. 31, 2011	$ 2,779,658	$ 793,910	$ 2,529	$ 3,594,588	$ 987	$ (1,677,328)	$ 64,972
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(18,110)					(17,467)	(643)
Other comprehensive income	519				519
Issuance of common shares	146,437		108	146,329
Stock based compensation plan activity	3,386		4	4,209		(827)
Conversion of Limited Partner Units			23	29,437			(29,460)
Distributions to preferred shareholders	(13,193)					(13,193)
Redemption of preferred shares	(168,272)	(168,272)		5,730		(5,730)
Distributions to common shareholders ($0.17 per share)	(43,922)					(43,922)
Distributions to noncontrolling interests	(1,033)						(1,033)
Balance at Mar. 31, 2012	$ 2,685,470	$ 625,638	$ 2,664	$ 3,780,293	$ 1,506	$ (1,758,467)	$ 33,836

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Shareholders' Equity (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Payments for Commissions	$ 3,000,000
Other Preferred Stock Dividends and Adjustments	5,730,000	163,000
Payments for Repurchase of Redeemable Preferred Stock	168,272,000	2,096,000
Common shares, shares issued	10.8
Proceeds from Issuance of Common Stock	146,969,000	0
6.95% Series M Cumulative Redeemable Preferred Shares [Member]
Other Preferred Stock Dividends and Adjustments	5,700,000
Preferred stock dividend rate, percentage	6.95%
Payments for Repurchase of Redeemable Preferred Stock	$ 168,300,000

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Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2012

Related Party Transactions [Abstract]

Schedule of Fees Earned from Related Parties

	Three Months Ended March 31,
	2012		2011
Management fees	$	2,731	$	1,977
Leasing fees	1,294		1,804
Construction and development fees	843		1,581

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Related Party Transactions (Schedule of Fees Earned from Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Management Fees [Member]
Revenue from related party transactions	$ 2,731	$ 1,977
Leasing Fees [Member]
Revenue from related party transactions	1,294	1,804
Construction and Development Fees [Member]
Revenue from related party transactions	$ 843	$ 1,581

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2012

Segment Reporting [Abstract]

Summary on Revenues and Funds from Operations

	Three Months Ended March 31,
	2012			2011
Revenues
Rental Operations:
Industrial	$	108,487		$	94,262
Office	67,417			75,602
Medical Office	20,741			13,484
Non-reportable Rental Operations	5,658			5,655
General contractor and service fee revenue (“Service Operations”)	68,968			146,547
Total Segment Revenues	271,271			335,550
Other Revenue	1,129			1,983
Consolidated Revenue from continuing operations	272,400			337,533
Discontinued Operations	1,234			52,170
Consolidated Revenue	$	273,634		$	389,703
Reconciliation of Funds From Operations
Net earnings excluding depreciation and Non-Segment Items
Industrial	$	79,902		$	66,726
Office	39,490			43,100
Medical Office	13,667			7,802
Non-reportable Rental Operations	4,008			4,207
Service Operations	5,047			10,883
	142,114			132,718
Non-Segment Items:
Interest expense	(61,086		)	(52,124		)
Interest and other income	146			87
Other operating expenses	(265		)	(85		)
General and administrative expenses	(11,839		)	(11,197		)
Undeveloped land carrying costs	(2,298		)	(2,309		)
Acquisition-related activity	(580		)	(589		)
Other non-segment income	352			981
Net (income) loss attributable to noncontrolling interests	643			(1,083		)
Noncontrolling interest share of FFO adjustments	(2,060		)	(569		)
Joint venture items	10,095			8,610
Dividends on preferred shares	(13,193		)	(15,974		)
Adjustments for redemption/repurchase of preferred shares	(5,730		)	(163		)
Discontinued operations	(106		)	11,756
FFO attributable to common shareholders	56,193			70,059
Depreciation and amortization on continuing operations	(91,613		)	(77,822		)
Depreciation and amortization on discontinued operations	(643		)	(17,159		)
Company’s share of joint venture adjustments	(8,586		)	(7,628		)
Earnings from depreciated property sales on continuing operations	(277		)	67,856
Earnings from depreciated property sales on discontinued operations	6,476			11,603
Earnings from depreciated property sales—share of joint venture	—			91
Noncontrolling interest share of FFO adjustments	2,060			569
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569

Reportable Segments Consolidated Assets

	March 31, 2012		December 31, 2011
Assets
Rental Operations:
Industrial	$	3,634,930	$	3,586,250
Office	1,683,691		1,742,196
Medical Office	674,298		580,177
Non-reportable Rental Operations	202,139		209,056
Service Operations	162,468		167,382
Total Segment Assets	6,357,526		6,285,061
Non-Segment Assets	514,879		719,376
Consolidated Assets	$	6,872,405	$	7,004,437

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Consolidated Statement of Changes in Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2012
Distributions to common shareholders, per share	$ 0.17

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accounts receivable, allowance	$ 2,693	$ 3,597
Straight-line rent receivable, allowance	6,997	7,447
Deferred financing costs, accumulated amortization	42,720	59,109
Deferred leasing and other costs, accumulated amortization	$ 311,525	$ 292,334
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares authorized	5,000	5,000
Preferred shares, shares issued	2,503	3,176
Preferred shares, shares outstanding	2,503	3,176
Common shares, par value	$ 0.01	$ 0.01
Common shares, shares authorized	400,000	400,000
Common shares, shares issued	266,405	252,927
Common shares, shares outstanding	266,405	252,927

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Discontinued Operations and Assets Held for Sale

3 Months Ended

Mar. 31, 2012

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations and Assets Held for Sale

Discontinued Operations and Assets Held for Sale

The following table illustrates the number of properties in discontinued operations:

	Held for Sale at March 31, 2012	Sold in 2012	Sold in 2011	Total
Office	0	7	93	100
Industrial	2	6	7	15
Retail	1	0	1	2
	3	13	101	117

We allocate interest expense to discontinued operations and have included such interest expense in computing income from discontinued operations. Interest expense allocable to discontinued operations includes interest on any secured debt for properties included in discontinued operations and an allocable share of our consolidated unsecured interest expense for unencumbered properties. The allocation of unsecured interest expense to discontinued operations was based upon the gross book value of the unencumbered real estate assets included in discontinued operations as it related to the total gross book value of our unencumbered real estate assets.

The following table illustrates the operations of the buildings reflected in discontinued operations for the three months ended March 31, 2012 and 2011, respectively (in thousands):

	Three Months Ended March 31,
	2012			2011
Revenues	$	1,234		$	52,170
Operating expenses	(815		)	(25,273		)
Depreciation and amortization	(643		)	(17,159		)
Operating income (loss)	(224		)	9,738
Interest expense	(525		)	(15,141		)
Loss before gain on sales	(749		)	(5,403		)
Gain on sale of depreciable properties	6,476			11,603
Income from discontinued operations	$	5,727		$	6,200

Dividends on preferred shares and adjustments for the redemption or repurchase of preferred shares are allocated entirely to continuing operations. The following table illustrates the allocation of the income (loss) attributable to common shareholders between continuing operations and discontinued operations, reflecting an allocation of income or loss attributable to noncontrolling interests between continuing and discontinued operations, for the three months ended March 31, 2012 and 2011, respectively (in thousands):

	Three Months Ended March 31,
	2012			2011
Income (loss) from continuing operations attributable to common shareholders	$	(41,992	)	$	41,522
Income from discontinued operations attributable to common shareholders	5,602			6,047
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569

At March 31, 2012, we classified three in-service properties as held-for-sale, which were included in discontinued operations, due to our present intention to sell the properties in the second quarter. The following table illustrates aggregate balance sheet information of the aforementioned three properties included in discontinued operations at March 31, 2012 (in thousands):

Real estate investment, net	$	18,159
Other assets	1,236
Total assets held-for-sale	$	19,395
Accrued expenses	$	434
Other liabilities	209
Total liabilities held-for-sale	$	643

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Document and Entity Information	3 Months Ended
	Mar. 31, 2012	May 04, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	DUKE REALTY CORP
Entity Central Index Key	0000783280
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		266,446,952

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Subsequent Events

3 Months Ended

Mar. 31, 2012

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Declaration of Dividends

Our board of directors declared the following dividends at its regularly scheduled board meeting held on April 25, 2012:

Class	Quarterly Amount/Share	Record Date	Payment Date
Common	$0.17	May 16, 2012	May 31, 2012
Preferred (per depositary share):
Series J	$0.414063	May 16, 2012	May 31, 2012
Series K	$0.406250	May 16, 2012	May 31, 2012
Series L	$0.412500	May 16, 2012	May 31, 2012
Series O	$0.523437	June 15, 2012	July 2, 2012

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Consolidated Statements of Operations and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues:
Rental and related revenue	$ 203,432	$ 190,986
General contractor and service fee revenue	68,968	146,547
Revenues, total	272,400	337,533
Expenses:
Rental expenses	37,342	40,699
Real estate taxes	28,671	27,471
General contractor and other services expenses	63,921	135,664
Depreciation and amortization	91,613	77,822
Costs and expenses, total	221,547	281,656
Other operating activities:
Equity in earnings of unconsolidated companies	1,509	1,073
Gain on sale of properties	(277)	67,856
Undeveloped land carrying costs	(2,298)	(2,309)
Other operating expenses	(265)	(85)
General and administrative expenses	(11,839)	(11,197)
Other operation transactions, total	(13,170)	55,338
Operating income	37,683	111,215
Other income (expenses):
Interest and other income, net	146	87
Interest expense	(61,086)	(52,124)
Acquisition-related activity	(580)	(589)
Income (loss) from continuing operations	(23,837)	58,589
Discontinued operations:
Loss before gain on sales	(749)	(5,403)
Gain on sale of depreciable properties	6,476	11,603
Income from discontinued operations	5,727	6,200
Net income (loss)	(18,110)	64,789
Dividends on preferred shares	(13,193)	(15,974)
Adjustments for redemption/repurchase of preferred shares	(5,730)	(163)
Net (income) loss attributable to noncontrolling interests	643	(1,083)
Net income (loss) attributable to common shareholders	(36,390)	47,569
Basic net income (loss) per common share:
Continuing operations attributable to common shareholders	$ (0.16)	$ 0.16
Discontinued operations attributable to common shareholders	$ 0.02	$ 0.03
Total	$ (0.14)	$ 0.19
Diluted net income (loss) per common share:
Continuing operations attributable to common shareholders	$ (0.16)	$ 0.16
Discontinued operations attributable to common shareholders	$ 0.02	$ 0.03
Total	$ (0.14)	$ 0.19
Weighted average number of common shares outstanding	258,365	252,406
Weighted average number of common shares and potential dilutive securities	258,365	258,837
Comprehensive income (loss)
Net income (loss)	(18,110)	64,789
Other comprehensive income:
Derivative instrument activity	519	771
Other comprehensive income	519	771
Comprehensive income (loss)	$ (17,591)	$ 65,560

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Indebtedness

3 Months Ended

Mar. 31, 2012

Debt Disclosure [Abstract]

Indebtedness

Indebtedness

The following table summarizes the book value and changes in the fair value of our debt for the three months ended March 31, 2012 (in thousands):

	Book Value at 12/31/11		Book Value at 3/31/12		Fair Value at 12/31/11		Issuances and Assumptions		Payoffs			Adjustments to Fair Value			Fair Value at 3/31/12
Fixed rate secured debt	$	1,167,188	$	1,174,920	$	1,256,331	$	18,741	$	(11,009	)	$	(840	)	$	1,263,223
Variable rate secured debt	6,045		6,045		6,045		—		—			—			6,045
Unsecured notes	2,616,063		2,615,612		2,834,610		—		(451		)	59,227			2,893,386
Unsecured lines of credit	20,293		20,293		20,244		—		—			4			20,248
Total	$	3,809,589	$	3,816,870	$	4,117,230	$	18,741	$	(11,460	)	$	58,391		$	4,182,902

Fixed Rate Secured Debt

Because our fixed rate secured debt is not actively traded in any marketplace, we utilized a discounted cash flow methodology to determine its fair value. Accordingly, we calculated fair value by applying an estimate of the current market rate to discount the debt’s remaining contractual cash flows. Our estimate of a current market rate, which is the most significant input in the discounted cash flow calculation, is intended to replicate debt of similar maturity and loan-to-value relationship. The estimated rates ranged from 3.50% to 5.40%, depending on the attributes of the specific loans. The current market rates we utilized were internally estimated; therefore, we have concluded that our determination of fair value for our fixed rate secured debt was primarily based upon Level 3 inputs.

We assumed one secured loan in conjunction with our acquisition activity in 2012. This assumed loan had a total face value of $18.1 million and fair value of $18.7 million. This assumed loan carries a stated interest rate of 5.14% and a remaining term upon acquisition of 2.2 years. We used an estimated market rate of 3.50% in determining the fair value of this loan.

Unsecured Notes

All but $21.0 million of our unsecured notes bear interest at fixed rates. We utilized broker estimates in estimating the fair value of our fixed rate unsecured debt. Our unsecured notes are thinly traded and, in certain cases, the broker estimates were not based upon comparable transactions. The broker estimates took into account any recent trades within the same series of our fixed rate unsecured debt, comparisons to recent trades of other series of our fixed rate unsecured debt, trades of fixed rate unsecured debt from companies with profiles similar to ours, as well as overall economic conditions. We reviewed these broker estimates for reasonableness and accuracy, considering whether the estimates were based upon market participant assumptions within the principal and most advantageous market and whether any other observable inputs would be more accurate indicators of fair value than the broker estimates. We concluded that the broker estimates were representative of fair value. We have determined that our estimation of the fair value of our fixed rate unsecured debt was primarily based upon Level 3 inputs, as defined. The estimated trading values of our fixed rate unsecured debt, depending on the maturity and coupon rates, ranged from 102.00% to 124.00% of face value.

The indentures (and related supplemental indentures) governing our outstanding series of notes also require us to comply with financial ratios and other covenants regarding our operations. We were in compliance with all such covenants as of March 31, 2012.

Unsecured Lines of Credit

Our unsecured lines of credit as of March 31, 2012 are described as follows (in thousands):

Description	Maximum Capacity		Maturity Date	Outstanding Balance at March 31, 2012
Unsecured Line of Credit - DRLP	$	850,000	December 2015	$	—
Unsecured Line of Credit - Consolidated Subsidiary	$	30,000	July 2012	$	20,293

The DRLP unsecured line of credit has an interest rate on borrowings of LIBOR plus 1.25%, and a maturity date of December 2015. Subject to certain conditions, the terms also include an option to increase the facility by up to an additional $400.0 million, for a total of up to $1.25 billion.

This line of credit provides us with an option to obtain borrowings from financial institutions that participate in the line at rates that may be lower than the stated interest rate, subject to certain restrictions.

This line of credit contains financial covenants that require us to meet certain financial ratios and defined levels of performance, including those related to fixed charge coverage, unsecured interest expense coverage and debt-to-asset value (with asset value being defined in the DRLP unsecured line of credit agreement). As of March 31, 2012, we were in compliance with all covenants under this line of credit.

The consolidated subsidiary’s unsecured line of credit allows for borrowings up to $30.0 million at a rate of LIBOR plus 0.85% (equal to 1.09% for outstanding borrowings as of March 31, 2012). This unsecured line of credit is used to fund development activities within the consolidated subsidiary and matures in July 2012.

To the extent that there are outstanding borrowings, we utilize a discounted cash flow methodology in order to estimate the fair value of our unsecured lines of credit. The net present value of the difference between future contractual interest payments and future interest payments based on our estimate of a current market rate represents the difference between the book value and the fair value. Our estimate of a current market rate is based upon the rate, considering current market conditions and our specific credit profile, at which we estimate we could obtain similar borrowings. The current market rate of 1.74% that we utilized was internally estimated; therefore, we have concluded that our determination of fair value for our consolidated subsidiary's unsecured line of credit was primarily based upon a Level 3 input.

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Acquisitions and Dispositions

3 Months Ended

Mar. 31, 2012

Business Combinations [Abstract]

Acquisitions and Dispositions

Acquisitions and Dispositions

2012 Acquisitions

We acquired seven operating properties during the three months ended March 31, 2012. These acquisitions consisted of one industrial property near Chicago, Illinois, two industrial properties in Columbus, Ohio and four medical office properties in various markets. The following table summarizes our allocation of the fair value of amounts recognized for each major class of assets and liabilities (in thousands) for these acquisitions:

Real estate assets	$	130,615
Lease related intangible assets	22,451
Other assets	2,829
Total acquired assets	155,895
Secured debt	18,741
Other liabilities	885
Total assumed liabilities	19,626
Fair value of acquired net assets	$	136,269

The leases in the acquired properties had a weighted average remaining life at acquisition of approximately 8.7 years.

Fair Value Measurements

The fair value estimates used in allocating the aggregate purchase price of each acquisition among the individual components of real estate assets and liabilities were determined primarily through calculating the “as-if vacant” value of each building, using the income approach, and relied significantly upon internally determined assumptions. As a result, we have, thus, determined these estimates to have been primarily based upon Level 3 inputs, which are unobservable inputs based on our own assumptions. The range of most significant assumptions utilized in making the lease-up and future disposition estimates used in calculating the “as-if vacant” value of each building acquired during the three months ended March 31, 2012 were as follows:

	Low		High
Discount rate	7.19	%	8.78	%
Exit capitalization rate	6.09	%	7.40	%
Lease-up period (months)	9		19
Net rental rate per square foot – Industrial	$2.75		$3.59
Net rental rate per square foot – Medical Office	$16.10		$26.14

Dispositions

We disposed of income-producing real estate assets and undeveloped land and received net proceeds of $63.3 million and $437.5 million, respectively, during the three months ended March 31, 2012 and 2011.

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Net Income (Loss) Per Common Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share

	Three Months Ended March 31,
	2012			2011
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569
Less: Dividends on participating securities	(852		)	(799		)
Basic net income (loss) attributable to common shareholders	(37,242		)	46,770
Noncontrolling interest in earnings of common unitholders	—			1,205
Diluted net income (loss) attributable to common shareholders	$	(37,242	)	$	47,975
Weighted average number of common shares outstanding	258,365			252,406
Weighted average partnership Units outstanding	—			6,384
Other potential dilutive shares	—			47
Weighted average number of common shares and potential dilutive securities	258,365			258,837

Computation of Anti-Dilutive Common Share

	Three Months Ended March 31,
	2012			2011
Noncontrolling interest in earnings of common unitholders	$	(811	)	$	—
Weighted average partnership Units outstanding	5,749			—
Other potential dilutive shares:
Anti-dilutive outstanding potential shares under fixed stock option and other stock-based compensation plans	1,733			1,711
Anti-dilutive potential shares under the Exchangeable Notes	—			3,432
Outstanding participating securities	5,051			4,752

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Variable Interest Entities (Tables)

3 Months Ended

Mar. 31, 2012

Variable Interest Entities [Abstract]

Balances Related to Joint Ventures

	Carrying Value			Maximum Loss Exposure
Investment in Unconsolidated Companies	$	33.5		$	33.5
Guarantee Obligations (1)	$	(16.6	)	$	(55.9	)

(1) We are party to guarantees of the third-party debt of these joint ventures and our maximum loss exposure is equal to the maximum monetary obligation pursuant to the guarantee agreements. We have recorded a liability for our probable future obligation under a guarantee to the lender of one of these ventures. Pursuant to an agreement with the lender, we may make partner loans to this joint venture that will reduce our maximum guarantee obligation on a dollar-for-dollar basis. The carrying value of our recorded guarantee obligations is included in other liabilities in our Consolidated Balance Sheets.

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Net Income (Loss) Per Common Share

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Net Income (Loss) Per Common Share

Net Income (Loss) Per Common Share

Basic net income (loss) per common share is computed by dividing net income (loss) attributable to common shareholders, less dividends on share-based awards expected to vest (referred to as “participating securities” and primarily composed of unvested restricted stock units), by the weighted average number of common shares outstanding for the period. Diluted net income (loss) per common share is computed by dividing the sum of basic net income (loss) attributable to common shareholders and the noncontrolling interest in earnings allocable to Units not owned by us (to the extent the Units are dilutive) by the sum of the weighted average number of common shares outstanding and, to the extent they are dilutive, Units outstanding, as well as any potential dilutive securities for the period.

The following table reconciles the components of basic and diluted net income (loss) per common share for the three months ended March 31, 2012 and 2011, respectively (in thousands): 

	Three Months Ended March 31,
	2012			2011
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569
Less: Dividends on participating securities	(852		)	(799		)
Basic net income (loss) attributable to common shareholders	(37,242		)	46,770
Noncontrolling interest in earnings of common unitholders	—			1,205
Diluted net income (loss) attributable to common shareholders	$	(37,242	)	$	47,975
Weighted average number of common shares outstanding	258,365			252,406
Weighted average partnership Units outstanding	—			6,384
Other potential dilutive shares	—			47
Weighted average number of common shares and potential dilutive securities	258,365			258,837

The partnership Units are anti-dilutive for the three months ended March 31, 2012 as a result of the net loss for this period. In addition, substantially all potential shares related to our stock-based compensation plans were anti-dilutive for both periods presented and potential shares related to our 3.75% Exchangeable Senior Notes (“Exchangeable Notes”), which were repaid in December 2011, were anti-dilutive for the three months ended March 31, 2011. The following table summarizes the data that is excluded from the computation of net income (loss) per common share as a result of being anti-dilutive (in thousands):

	Three Months Ended March 31,
	2012			2011
Noncontrolling interest in earnings of common unitholders	$	(811	)	$	—
Weighted average partnership Units outstanding	5,749			—
Other potential dilutive shares:
Anti-dilutive outstanding potential shares under fixed stock option and other stock-based compensation plans	1,733			1,711
Anti-dilutive potential shares under the Exchangeable Notes	—			3,432
Outstanding participating securities	5,051			4,752

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Shareholders' Equity

3 Months Ended

Mar. 31, 2012

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders' Equity

In March 2012, we redeemed all of the outstanding shares of our 6.95% Series M Cumulative Redeemable Preferred Shares at a liquidation amount of $168.3 million. Original offering costs of $5.7 million were included as a reduction to net loss attributable to common shareholders in conjunction with the redemption of these shares.

In the first three months of 2012, we issued 10.8 million shares of common stock pursuant to our at the market offering, generating net proceeds of approximately $147.0 million. We paid $3.0 million in commissions related to the sale of these common shares. The proceeds from this offering were contributed to DRLP in exchange for additional Units in DRLP and were used for acquisitions, general corporate purposes and redemption of preferred shares and fixed rate secured debt.

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Related Party Transactions

3 Months Ended

Mar. 31, 2012

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

We provide property management, asset management, leasing, construction and other tenant related services to unconsolidated companies in which we have equity interests. We recorded the corresponding fees based on contractual terms that approximate market rates for these types of services and we have eliminated our ownership percentage of these fees in the consolidated financial statements. The following table summarizes the fees earned from these companies for the three months ended March 31, 2012 and 2011, respectively (in thousands): 

	Three Months Ended March 31,
	2012		2011
Management fees	$	2,731	$	1,977
Leasing fees	1,294		1,804
Construction and development fees	843		1,581

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Segment Reporting

3 Months Ended

Mar. 31, 2012

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting

We have four reportable operating segments at March 31, 2012, the first three of which consist of the ownership and rental of (i) industrial, (ii) office and (iii) medical office real estate investments. The operations of our industrial, office and medical office properties, along with our retail properties, are collectively referred to as “Rental Operations.” Our retail properties, as well as any other properties not included in our reportable segments, do not by themselves meet the quantitative thresholds for separate presentation as a reportable segment. The fourth reportable segment consists of various real estate services such as property management, asset management, maintenance, leasing, development and construction management to third-party property owners and joint ventures, and is collectively referred to as “Service Operations.” Our reportable segments offer different products or services and are managed separately because each segment requires different operating strategies and management expertise.

As of March 31, 2012, one of the quantitative thresholds was triggered, which required our medical office property operating segment to be presented as a separate reportable segment. As such, our medical office properties are presented as a separate reportable segment for the three-month period ended March 31, 2012 as well as for the comparative prior period.

Other revenue consists of other operating revenues not identified with one of our operating segments. Interest expense and other non-property specific revenues and expenses are not allocated to individual segments in determining our performance measure.

We assess and measure our overall operating results based upon an industry performance measure referred to as Funds From Operations (“FFO”), which management believes is a useful indicator of our consolidated operating performance. FFO is used by industry analysts and investors as a supplemental operating performance measure of a REIT. The National Association of Real Estate Investment Trusts (“NAREIT”) created FFO as a supplemental measure of REIT operating performance that excludes historical cost depreciation, among other items, from net income determined in accordance with GAAP. FFO is a non-GAAP financial measure. The most comparable GAAP measure is net income (loss) attributable to common shareholders. FFO attributable to common shareholders should not be considered as a substitute for net income (loss) attributable to common shareholders or any other measures derived in accordance with GAAP and may not be comparable to other similarly titled measures of other companies. FFO is calculated in accordance with the definition that was adopted by the Board of Governors of NAREIT. We do not allocate certain income and expenses (“Non-Segment Items”, as shown in the table below) to our operating segments. Thus, the operational performance measure presented here on a segment-level basis represents net earnings, excluding depreciation expense and the Non-Segment Items not allocated, and is not meant to present FFO as defined by NAREIT.

Historical cost accounting for real estate assets in accordance with GAAP implicitly assumes that the value of real estate assets diminishes predictably over time. Since real estate values instead have historically risen or fallen with market conditions, many industry analysts and investors have considered presentation of operating results for real estate companies that use historical cost accounting to be insufficient by themselves. FFO, as defined by NAREIT, represents GAAP net income (loss), excluding extraordinary items as defined under GAAP and gains or losses from sales of previously depreciated real estate assets, impairment charges related to depreciable real estate assets, plus certain non-cash items such as real estate asset depreciation and amortization, and after similar adjustments for unconsolidated partnerships and joint ventures.

Management believes that the use of FFO attributable to common shareholders, combined with net income (which remains the primary measure of performance), improves the understanding of operating results of REITs among the investing public and makes comparisons of REIT operating results more meaningful. Management believes that excluding gains or losses related to sales of previously depreciated real estate assets, impairment charges related to depreciable real estate assets and real estate asset depreciation and amortization enables investors and analysts to readily identify the operating results of the long-term assets that form the core of a REIT’s activity and assist them in comparing these operating results between periods or between different companies.

The following table shows (i) the revenues for each of the reportable segments and (ii) a reconciliation of FFO attributable to common shareholders to net income (loss) attributable to common shareholders for the three months ended March 31, 2012 and 2011, respectively (in thousands): 

	Three Months Ended March 31,
	2012			2011
Revenues
Rental Operations:
Industrial	$	108,487		$	94,262
Office	67,417			75,602
Medical Office	20,741			13,484
Non-reportable Rental Operations	5,658			5,655
General contractor and service fee revenue (“Service Operations”)	68,968			146,547
Total Segment Revenues	271,271			335,550
Other Revenue	1,129			1,983
Consolidated Revenue from continuing operations	272,400			337,533
Discontinued Operations	1,234			52,170
Consolidated Revenue	$	273,634		$	389,703
Reconciliation of Funds From Operations
Net earnings excluding depreciation and Non-Segment Items
Industrial	$	79,902		$	66,726
Office	39,490			43,100
Medical Office	13,667			7,802
Non-reportable Rental Operations	4,008			4,207
Service Operations	5,047			10,883
	142,114			132,718
Non-Segment Items:
Interest expense	(61,086		)	(52,124		)
Interest and other income	146			87
Other operating expenses	(265		)	(85		)
General and administrative expenses	(11,839		)	(11,197		)
Undeveloped land carrying costs	(2,298		)	(2,309		)
Acquisition-related activity	(580		)	(589		)
Other non-segment income	352			981
Net (income) loss attributable to noncontrolling interests	643			(1,083		)
Noncontrolling interest share of FFO adjustments	(2,060		)	(569		)
Joint venture items	10,095			8,610
Dividends on preferred shares	(13,193		)	(15,974		)
Adjustments for redemption/repurchase of preferred shares	(5,730		)	(163		)
Discontinued operations	(106		)	11,756
FFO attributable to common shareholders	56,193			70,059
Depreciation and amortization on continuing operations	(91,613		)	(77,822		)
Depreciation and amortization on discontinued operations	(643		)	(17,159		)
Company’s share of joint venture adjustments	(8,586		)	(7,628		)
Earnings from depreciated property sales on continuing operations	(277		)	67,856
Earnings from depreciated property sales on discontinued operations	6,476			11,603
Earnings from depreciated property sales—share of joint venture	—			91
Noncontrolling interest share of FFO adjustments	2,060			569
Net income (loss) attributable to common shareholders	$	(36,390	)	$	47,569

The assets for each of the reportable segments as of March 31, 2012 and December 31, 2011 are as follows (in thousands):

	March 31, 2012		December 31, 2011
Assets
Rental Operations:
Industrial	$	3,634,930	$	3,586,250
Office	1,683,691		1,742,196
Medical Office	674,298		580,177
Non-reportable Rental Operations	202,139		209,056
Service Operations	162,468		167,382
Total Segment Assets	6,357,526		6,285,061
Non-Segment Assets	514,879		719,376
Consolidated Assets	$	6,872,405	$	7,004,437

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Indebtedness (Unsecured Lines of Credit) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Unsecured Line of Credit - DRLP [Member]
Maximum Capacity	$ 850,000
Maturity date	December 2015
Line of credit balance	0
Unsecured Line of Credit - Consolidated Subsidiary [Member]
Maximum Capacity	30,000
Maturity date	July 2012
Line of credit balance	$ 20,293

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Indebtedness (Tables)

3 Months Ended

Mar. 31, 2012

Debt Disclosure [Abstract]

Fair Value, Liabilities Measured on a Recurring Basis, Disclosure Only

	Book Value at 12/31/11		Book Value at 3/31/12		Fair Value at 12/31/11		Issuances and Assumptions		Payoffs			Adjustments to Fair Value			Fair Value at 3/31/12
Fixed rate secured debt	$	1,167,188	$	1,174,920	$	1,256,331	$	18,741	$	(11,009	)	$	(840	)	$	1,263,223
Variable rate secured debt	6,045		6,045		6,045		—		—			—			6,045
Unsecured notes	2,616,063		2,615,612		2,834,610		—		(451		)	59,227			2,893,386
Unsecured lines of credit	20,293		20,293		20,244		—		—			4			20,248
Total	$	3,809,589	$	3,816,870	$	4,117,230	$	18,741	$	(11,460	)	$	58,391		$	4,182,902

Unsecured Lines of Credit

Description	Maximum Capacity		Maturity Date	Outstanding Balance at March 31, 2012
Unsecured Line of Credit - DRLP	$	850,000	December 2015	$	—
Unsecured Line of Credit - Consolidated Subsidiary	$	30,000	July 2012	$	20,293

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Subsequent Events (Tables)

3 Months Ended

Mar. 31, 2012

Subsequent Events [Abstract]

Schedule of Dividends Declared

Class	Quarterly Amount/Share	Record Date	Payment Date
Common	$0.17	May 16, 2012	May 31, 2012
Preferred (per depositary share):
Series J	$0.414063	May 16, 2012	May 31, 2012
Series K	$0.406250	May 16, 2012	May 31, 2012
Series L	$0.412500	May 16, 2012	May 31, 2012
Series O	$0.523437	June 15, 2012	July 2, 2012

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Discontinued Operations and Assets Held for Sale (Table Illustration of Number of Properties in Discontinued Operations) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2012 buildings	Dec. 31, 2011 buildings
Number of properties held for sale in discontinued operations	3
Number of properties sold in discontinued operations	13	101
Total number of properties in discontinued operations	117
Office [Member]
Number of properties held for sale in discontinued operations	0
Number of properties sold in discontinued operations	7	93
Total number of properties in discontinued operations	100
Industrial [Member]
Number of properties held for sale in discontinued operations	2
Number of properties sold in discontinued operations	6	7
Total number of properties in discontinued operations	15
Retail [Member]
Number of properties held for sale in discontinued operations	1
Number of properties sold in discontinued operations	0	1
Total number of properties in discontinued operations	2

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ (18,110)	$ 64,789
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	63,860	67,063
Amortization of deferred leasing and other costs	28,396	27,918
Amortization of deferred financing costs	3,246	3,644
Straight-line rent adjustment	(5,852)	(6,966)
Earnings from land and depreciated property sales	(6,199)	(79,459)
Third-party construction contracts, net	(1,877)	(13,974)
Other accrued revenues and expenses, net	(43,116)	(42,945)
Operating distributions received in excess of equity in earnings from unconsolidated companies	4,995	7,955
Net cash provided by operating activities	25,343	28,025
Cash flows from investing activities:
Development of real estate investments	(29,639)	(37,318)
Acquisition of real estate investments and related intangible assets	(131,515)	(22,261)
Acquisition of undeveloped land	(12,180)	0
Second generation tenant improvements, leasing costs and building improvements	(15,361)	(17,476)
Other deferred leasing costs	(9,142)	(6,272)
Other assets	502	2,816
Proceeds from land and depreciated property sales, net	63,281	437,494
Capital distributions from unconsolidated companies	0	54,730
Capital contributions and advances to unconsolidated companies, net	(3,521)	(6,068)
Net cash provided by (used for) investing activities	(137,575)	405,645
Cash flows from financing activities:
Proceeds from Issuance of Common Stock	146,969	0
Payments for redemption/repurchase of preferred shares	(168,272)	(2,096)
Payments on unsecured debt	(451)	(42,948)
Payments on secured indebtedness including principal amortization	(10,455)	(3,897)
Borrowings on lines of credit, net	0	(174,717)
Distributions to common shareholders	(43,922)	(42,892)
Distributions to preferred shareholders	(9,467)	(15,974)
Distributions to noncontrolling interests	(1,033)	(1,145)
Deferred financing costs	(206)	(1,270)
Net cash used for financing activities	(86,837)	(284,939)
Net increase (decrease) in cash and cash equivalents	(199,069)	148,731
Cash and cash equivalents at beginning of period	213,809	18,384
Cash and cash equivalents at end of period	14,740	167,115
Non-cash investing and financing activities:
Assumption of indebtedness and other liabilities in real estate acquisitions	19,626	85,955
Contribution of properties to unconsolidated companies	0	52,110
Issuance of Limited Partner Units for acquisition	0	28,357
Preferred distributions declared but not paid	3,726	0
Parent [Member]
Non-cash investing and financing activities:
Conversion of Limited Partner Units to common shares	$ 29,460	$ 933

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Variable Interest Entities

3 Months Ended

Mar. 31, 2012

Variable Interest Entities [Abstract]

Required Disclosures Regarding Variable Interest Entities [Text Block]

Variable Interest Entities

At March 31, 2012, there are three unconsolidated joint ventures that we have determined meet the criteria to be considered variable interest entities (“VIEs”). These three unconsolidated joint ventures were formed with the sole purpose of developing, constructing, leasing, marketing and selling or operating properties. The business activities of these unconsolidated joint ventures have been financed through a combination of equity contributions, partner/member loans, and third-party debt that is guaranteed by both us and the other partner/member of each entity. All significant decisions for these unconsolidated joint ventures, including those decisions that most significantly impact each venture’s economic performance, require unanimous approval of each joint venture’s partners or members. In certain cases, these decisions also require lender approval. Unanimous approval requirements for these unconsolidated joint ventures include entering into new leases, setting annual operating budgets, selling underlying properties, and incurring additional indebtedness. Because no single entity exercises control over the decisions that most significantly affect each joint venture’s economic performance, we determined that the equity method of accounting is appropriate.

The following is a summary of the carrying value in our consolidated balance sheet, as well as our maximum loss exposure under guarantees for the three unconsolidated subsidiaries that we have determined to be VIEs as of March 31, 2012 (in millions):

	Carrying Value			Maximum Loss Exposure
Investment in Unconsolidated Companies	$	33.5		$	33.5
Guarantee Obligations (1)	$	(16.6	)	$	(55.9	)

(1) We are party to guarantees of the third-party debt of these joint ventures and our maximum loss exposure is equal to the maximum monetary obligation pursuant to the guarantee agreements. We have recorded a liability for our probable future obligation under a guarantee to the lender of one of these ventures. Pursuant to an agreement with the lender, we may make partner loans to this joint venture that will reduce our maximum guarantee obligation on a dollar-for-dollar basis. The carrying value of our recorded guarantee obligations is included in other liabilities in our Consolidated Balance Sheets.

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General Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Common partnership interests of DRLP owned	98.30%

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Net Income (Loss) Per Common Share (Computation of Anti-Dilutive Common Share) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Noncontrolling interest in earnings of common unitholders	$ (811)	$ 0
Weighted average partnership Units outstanding	5,749	0
Anti-dilutive outstanding potential shares under fixed stock option and other stock-based compensation plans	1,733	1,711
Anti-dilutive potential shares under the Exchangeable Notes	0	3,432
Outstanding participating securities	5,051	4,752

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Acquisitions and Dispositions (Tables)

3 Months Ended

Mar. 31, 2012

Summary of Significant Assumptions Utilized in Estimates

	Low		High
Discount rate	7.19	%	8.78	%
Exit capitalization rate	6.09	%	7.40	%
Lease-up period (months)	9		19
Net rental rate per square foot – Industrial	$2.75		$3.59
Net rental rate per square foot – Medical Office	$16.10		$26.14

Other 2012 Acquisitions [Member] [Domain]

Summary of Allocation of Fair Value of Amounts Recognized

Real estate assets	$	130,615
Lease related intangible assets	22,451
Other assets	2,829
Total acquired assets	155,895
Secured debt	18,741
Other liabilities	885
Total assumed liabilities	19,626
Fair value of acquired net assets	$	136,269