Duke Realty Limited PARTNERSHIP 10-Q 4 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 04, 2015
Entity Information [Line Items]
Entity Registrant Name	DUKE REALTY CORP
Entity Central Index Key	783,280
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		345,264,335
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Duke Realty Limited Partnership [Member]
Entity Information [Line Items]
Entity Registrant Name	DUKE REALTY LIMITED PARTNERSHIP\
Entity Central Index Key	1,003,410
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Land and improvements	$ 1,371,457	$ 1,412,867
Buildings and tenant improvements	4,758,794	4,986,390
Construction in progress	337,173	246,062
Investments in and advances to unconsolidated companies	276,926	293,650
Undeveloped land	435,519	499,960
Real estate investment property, at cost, total	7,179,869	7,438,929
Accumulated depreciation	(1,202,585)	(1,235,337)
Net real estate investments	5,977,284	6,203,592
Real estate investments and other assets held-for-sale	8,920	725,051
Cash and cash equivalents	175,874	17,922
Accounts receivable, net of allowance	20,985	26,168
Straight-line rent receivable, net of allowance	116,639	109,657
Receivables on construction contracts, including retentions	24,822	36,224
Deferred financing costs, net of accumulated amortization	30,428	38,734
Deferred leasing and other costs, net of accumulated amortization	359,652	387,635
Escrow deposits and other assets	425,305	209,856
Total Assets	7,139,909	7,754,839
LIABILITIES AND EQUITY
Secured debt	764,707	942,478
Unsecured debt	2,681,313	3,364,161
Unsecured line of credit	0	106,000
Long-term debt, total	3,446,020	4,412,639
Liabilities related to real estate investments held-for-sale	225	59,092
Construction payables and amounts due subcontractors, including retentions	66,709	69,470
Accrued real estate taxes	91,252	76,308
Accrued interest	31,330	55,110
Other accrued expenses	42,489	62,632
Other liabilities	110,611	95,566
Tenant security deposits and prepaid rents	39,830	44,142
Total Liabilities	3,828,466	4,874,959
Equity
Common shares	3,453	3,441
Additional paid-in capital	4,959,060	4,944,800
Accumulated other comprehensive income	2,066	3,026
Distributions in excess of net income	(1,677,314)	(2,090,942)
Total shareholders' equity	3,287,265	2,860,325
Noncontrolling interests	24,178	19,555
Total Equity	3,311,443	2,879,880
Total Liabilities and Equity	7,139,909	7,754,839
Duke Realty Limited Partnership [Member]
ASSETS
Land and improvements	1,371,457	1,412,867
Buildings and tenant improvements	4,758,794	4,986,390
Construction in progress	337,173	246,062
Investments in and advances to unconsolidated companies	276,926	293,650
Undeveloped land	435,519	499,960
Real estate investment property, at cost, total	7,179,869	7,438,929
Accumulated depreciation	(1,202,585)	(1,235,337)
Net real estate investments	5,977,284	6,203,592
Real estate investments and other assets held-for-sale	8,920	725,051
Cash and cash equivalents	175,874	17,922
Accounts receivable, net of allowance	20,985	26,168
Straight-line rent receivable, net of allowance	116,639	109,657
Receivables on construction contracts, including retentions	24,822	36,224
Deferred financing costs, net of accumulated amortization	30,428	38,734
Deferred leasing and other costs, net of accumulated amortization	359,652	387,635
Escrow deposits and other assets	425,305	209,856
Total Assets	7,139,909	7,754,839
LIABILITIES AND EQUITY
Secured debt	764,707	942,478
Unsecured debt	2,681,313	3,364,161
Unsecured line of credit	0	106,000
Long-term debt, total	3,446,020	4,412,639
Liabilities related to real estate investments held-for-sale	225	59,092
Construction payables and amounts due subcontractors, including retentions	66,709	69,470
Accrued real estate taxes	91,252	76,308
Accrued interest	31,330	55,110
Other accrued expenses	42,489	62,812
Other liabilities	110,611	95,566
Tenant security deposits and prepaid rents	39,830	44,142
Total Liabilities	3,828,466	4,875,139
Equity
Common equity	3,285,199	2,857,119
General Partners' equity	3,285,199	2,857,119
Limited Partners' common equity	21,395	17,289
Accumulated other comprehensive income	2,066	3,026
Total partners' equity	3,308,660	2,877,434
Noncontrolling interests	2,783	2,266
Total Equity	3,311,443	2,879,700
Total Liabilities and Equity	$ 7,139,909	$ 7,754,839

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts receivable, allowance	$ 1,474	$ 2,742
Straight-line rent receivable, allowance	5,997	8,405
Deferred financing costs, accumulated amortization	32,737	38,863
Deferred leasing and other costs, accumulated amortization	$ 244,190	$ 259,883
Common shares, par value	$ 0.01	$ 0.01
Common shares, shares authorized	600,000,000	600,000,000
Common shares, shares issued	345,260,000	344,112,000
Common shares, shares outstanding	345,260,000	344,112,000
Duke Realty Limited Partnership [Member]
Accounts receivable, allowance	$ 1,474	$ 2,742
Straight-line rent receivable, allowance	5,997	8,405
Deferred financing costs, accumulated amortization	32,737	38,863
Deferred leasing and other costs, accumulated amortization	$ 244,190	$ 259,883
Common equity, General Partner Units issued	345,260,000	344,112,000
Common equity, General Partner Units outstanding	345,260,000	344,112,000
Limited Partner Units issued	3,504,000	3,717,000
Limited Partner Units outstanding	3,504,000	3,717,000

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Rental and related revenue	$ 200,938	$ 202,067	$ 617,549	$ 615,493
General contractor and service fee revenue	33,599	59,739	110,320	185,072
Revenues, total	234,537	261,806	727,869	800,565
Expenses:
Rental expenses	30,137	29,829	96,355	104,090
Real estate taxes	27,702	29,501	86,228	87,355
General contractor and other services expenses	29,694	52,528	98,455	163,657
Depreciation and amortization	79,898	85,772	240,135	262,570
Costs and expenses, total	167,431	197,630	521,173	617,672
Other operating activities:
Equity in earnings (loss) of unconsolidated companies	(5,088)	19,178	16,281	82,325
Gain on sale of properties	71,259	47,143	202,153	133,617
Gain on land sales	1,659	3,167	24,096	7,208
Other operating expenses	(1,467)	(1,829)	(4,579)	(6,032)
Asset Impairment Charges	(2,426)	(6,368)	(7,896)	(8,891)
General and administrative expenses	(11,340)	(10,573)	(47,582)	(35,632)
Other Operating Activities, Net	52,597	50,718	182,473	172,595
Operating income	119,703	114,894	389,169	355,488
Other income (expenses):
Interest and other income, net	1,343	356	3,056	936
Interest expense	(41,615)	(47,421)	(134,576)	(145,628)
Gains (Losses) on Extinguishment of Debt	64	0	(82,589)	(139)
Acquisition-related activity	(5,660)	(110)	(6,993)	(871)
Income from continuing operations before income taxes	73,835	67,719	168,067	209,786
Income Tax Benefit (Expense)	3,305	442	4,109	(2,595)
Income from continuing operations	77,140	68,161	172,176	207,191
Discontinued operations:
Income (loss) before gain on sales	(43)	2,277	10,546	6,569
Gain on sale of depreciable properties, net of tax	111	1,119	414,620	19,895
Income from discontinued operations	68	3,396	425,166	26,464
Net income	77,208	71,557	597,342	233,655
Dividends on preferred shares/units	0	(6,072)	0	(20,155)
Adjustments for redemption of preferred shares/units	0	(3,196)	0	(2,713)
Net (income) loss attributable to noncontrolling interests	(774)	(756)	(6,284)	(2,883)
Net income attributable to common shareholders	$ 76,434	$ 61,533	$ 591,058	$ 207,904
Basic net income per common share:
Continuing operations attributable to common shareholders/unitholders	$ 0.22	$ 0.17	$ 0.49	$ 0.54
Discontinued operations attributable to common shareholders/unitholders	0	0.01	1.22	0.08
Total	0.22	0.18	1.71	0.62
Diluted net income per common share:
Continuing operations attributable to common shareholders/unitholders	0.22	0.17	0.49	0.54
Discontinued operations attributable to common shareholders/unitholders	0	0.01	1.21	0.08
Total	$ 0.22	$ 0.18	$ 1.70	$ 0.62
Weighted average number of common shares/units outstanding	345,256	341,165	344,986	333,393
Weighted average number of common shares/units and potential dilutive securities	352,150	345,826	352,013	338,057
Comprehensive income:
Net income	$ 77,208	$ 71,557	$ 597,342	$ 233,655
Other comprehensive loss:
Amortization of interest contracts	(274)	(287)	(837)	(861)
Other Comprehensive Income, Other, Net of Tax	0	0	(123)	55
Total other comprehensive loss	(274)	(287)	(960)	(806)
Comprehensive income	76,934	71,270	596,382	232,849
Duke Realty Limited Partnership [Member]
Revenues:
Rental and related revenue	200,938	202,067	617,549	615,493
General contractor and service fee revenue	33,599	59,739	110,320	185,072
Revenues, total	234,537	261,806	727,869	800,565
Expenses:
Rental expenses	30,137	29,829	96,355	104,090
Real estate taxes	27,702	29,501	86,228	87,355
General contractor and other services expenses	29,694	52,528	98,455	163,657
Depreciation and amortization	79,898	85,772	240,135	262,570
Costs and expenses, total	167,431	197,630	521,173	617,672
Other operating activities:
Equity in earnings (loss) of unconsolidated companies	(5,088)	19,178	16,281	82,325
Gain on sale of properties	71,259	47,143	202,153	133,617
Gain on land sales	1,659	3,167	24,096	7,208
Other operating expenses	(1,467)	(1,829)	(4,579)	(6,032)
Asset Impairment Charges	(2,426)	(6,368)	(7,896)	(8,891)
General and administrative expenses	(11,340)	(10,573)	(47,582)	(35,632)
Other Operating Activities, Net	52,597	50,718	182,473	172,595
Operating income	119,703	114,894	389,169	355,488
Other income (expenses):
Interest and other income, net	1,343	356	3,056	936
Interest expense	(41,615)	(47,421)	(134,576)	(145,628)
Gains (Losses) on Extinguishment of Debt	64	0	(82,589)	(139)
Acquisition-related activity	(5,660)	(110)	(6,993)	(871)
Income from continuing operations before income taxes	73,835	67,719	168,067	209,786
Income Tax Benefit (Expense)	3,305	442	4,109	(2,595)
Income from continuing operations	77,140	68,161	172,176	207,191
Discontinued operations:
Income (loss) before gain on sales	(43)	2,277	10,546	6,569
Gain on sale of depreciable properties, net of tax	111	1,119	414,620	19,895
Income from discontinued operations	68	3,396	425,166	26,464
Net income	77,208	71,557	597,342	233,655
Dividends on preferred shares/units	0	(6,072)	0	(20,155)
Adjustments for redemption of preferred shares/units	0	(3,196)	0	(2,713)
Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, NonRedeemable	(23)	39	(72)	(145)
Net income attributable to common shareholders	$ 77,185	$ 62,328	$ 597,270	$ 210,642
Basic net income per common share:
Continuing operations attributable to common shareholders/unitholders	$ 0.22	$ 0.17	$ 0.49	$ 0.54
Discontinued operations attributable to common shareholders/unitholders	0	0.01	1.22	0.08
Total	0.22	0.18	1.71	0.62
Diluted net income per common share:
Continuing operations attributable to common shareholders/unitholders	0.22	0.17	0.49	0.54
Discontinued operations attributable to common shareholders/unitholders	0	0.01	1.21	0.08
Total	$ 0.22	$ 0.18	$ 1.70	$ 0.62
Weighted average number of common shares/units outstanding	348,760	345,545	348,595	337,777
Weighted average number of common shares/units and potential dilutive securities	352,150	345,826	352,013	338,057
Comprehensive income:
Net income	$ 77,208	$ 71,557	$ 597,342	$ 233,655
Other comprehensive loss:
Amortization of interest contracts	(274)	(287)	(837)	(861)
Other Comprehensive Income, Other, Net of Tax	0	0	(123)	55
Total other comprehensive loss	(274)	(287)	(960)	(806)
Comprehensive income	$ 76,934	$ 71,270	$ 596,382	$ 232,849

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ 597,342	$ 233,655
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	192,135	216,963
Amortization of deferred leasing and other costs	51,517	73,942
Amortization of deferred financing costs	5,543	7,423
Straight-line rental income and expense, net	(18,498)	(16,419)
Asset Impairment Charges	7,896	8,891
Loss on debt transactions	82,589	139
Gains on land and depreciated property sales	(644,044)	(163,689)
Third-party construction contracts, net	(3,805)	(4,397)
Other accrued revenues and expenses, net	7,129	17,920
Operating distributions received in excess of (less than) equity in earnings from unconsolidated companies	414	(53,429)
Net cash provided by operating activities	278,218	320,999
Cash flows from investing activities:
Development of real estate investments	(221,201)	(385,088)
Acquisition of real estate investments and related intangible assets	(28,849)	(94,032)
Acquisition of undeveloped land	(39,881)	(37,579)
Second generation tenant improvements, leasing costs and building improvements	(45,688)	(69,475)
Other deferred leasing costs	(26,940)	(24,948)
Other assets	(38,104)	514
Proceeds from land and depreciated property sales, net	1,534,177	386,215
Capital distributions from unconsolidated companies	68,915	70,054
Capital contributions and advances to unconsolidated companies	(55,020)	(5,874)
Net cash provided by (used for) investing activities	1,147,409	(160,213)
Cash flows from financing activities:
Proceeds from issuance of common shares, net	4,592	255,962
Payments for redemption/repurchase of preferred shares/units	0	(113,797)
Payments on unsecured debt	(759,948)	(1,556)
Payments on secured indebtedness including principal amortization	(221,085)	(93,036)
Borrowings (repayments) on line of credit, net	(106,000)	52,000
Distributions to common shareholders/unitholders	(175,967)	(169,917)
Distributions to preferred shareholders/unitholders	0	(20,789)
Distributions to Noncontrolling Interest, Net	(1,403)	(2,044)
Buyout of noncontrolling interests	0	(7,803)
Change in book overdrafts	(7,754)	(12,450)
Deferred financing costs	(110)	(499)
Net cash provided by (used for) financing activities	(1,267,675)	(113,929)
Net increase (decrease) in cash and cash equivalents	157,952	46,857
Cash and cash equivalents at beginning of period	17,922	19,275
Cash and cash equivalents at end of period	175,874	66,132
Noncash investing and financing activities:
Assumption of indebtedness and other liabilities in real estate acquisitions	0	54
Mortgages note receivable from buyers in property sales	204,428	0
Conversion of Limited Partner Units to common shares	2,416	56
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income (loss)	597,342	233,655
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	192,135	216,963
Amortization of deferred leasing and other costs	51,517	73,942
Amortization of deferred financing costs	5,543	7,423
Straight-line rental income and expense, net	(18,498)	(16,419)
Asset Impairment Charges	7,896	8,891
Loss on debt transactions	82,589	139
Gains on land and depreciated property sales	(644,044)	(163,689)
Third-party construction contracts, net	(3,805)	(4,397)
Other accrued revenues and expenses, net	6,949	17,920
Operating distributions received in excess of (less than) equity in earnings from unconsolidated companies	414	(53,429)
Net cash provided by operating activities	278,038	320,999
Cash flows from investing activities:
Development of real estate investments	(221,201)	(385,088)
Acquisition of real estate investments and related intangible assets	(28,849)	(94,032)
Acquisition of undeveloped land	(39,881)	(37,579)
Second generation tenant improvements, leasing costs and building improvements	(45,688)	(69,475)
Other deferred leasing costs	(26,940)	(24,948)
Other assets	(38,104)	514
Proceeds from land and depreciated property sales, net	1,534,177	386,215
Capital distributions from unconsolidated companies	68,915	70,054
Capital contributions and advances to unconsolidated companies	(55,020)	(5,874)
Net cash provided by (used for) investing activities	1,147,409	(160,213)
Cash flows from financing activities:
Contributions from the General Partner	4,772	255,962
Payments for redemption/repurchase of preferred shares/units	0	(113,797)
Payments on unsecured debt	(759,948)	(1,556)
Payments on secured indebtedness including principal amortization	(221,085)	(93,036)
Borrowings (repayments) on line of credit, net	(106,000)	52,000
Distributions to common shareholders/unitholders	(177,815)	(172,153)
Distributions to preferred shareholders/unitholders	0	(20,789)
Distributions to Noncontrolling Interest, Net	445	192
Buyout of noncontrolling interests	0	(7,803)
Change in book overdrafts	(7,754)	(12,450)
Deferred financing costs	(110)	(499)
Net cash provided by (used for) financing activities	(1,267,495)	(113,929)
Net increase (decrease) in cash and cash equivalents	157,952	46,857
Cash and cash equivalents at beginning of period	17,922	19,275
Cash and cash equivalents at end of period	175,874	66,132
Noncash investing and financing activities:
Assumption of indebtedness and other liabilities in real estate acquisitions	0	54
Mortgages note receivable from buyers in property sales	204,428	0
Conversion of Limited Partner Units to common shares	$ 2,416	$ 56

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Total	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]	Duke Realty Limited Partnership [Member]	Duke Realty Limited Partnership [Member]Common Stock [Member]	Duke Realty Limited Partnership [Member]Limited Partner [Member]	Duke Realty Limited Partnership [Member]Accumulated Other Comprehensive Income (Loss) [Member]	Duke Realty Limited Partnership [Member]Non-controlling Interest [Member]	Duke Realty Limited Partnership [Member]Stockholders' Equity, Total [Member]
Beginning Balance - General Partner at Dec. 31, 2014	$ 2,879,880	$ 3,441	$ 4,944,800	$ 3,026	$ (2,090,942)	$ 19,555
Beginning Balance - Partnership at Dec. 31, 2014							$ 2,879,700	$ 2,857,119	$ 17,289	$ 3,026	$ 2,266	$ 2,877,434
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	597,342				591,058	6,284	597,342	591,058	6,212		72	597,270
Other comprehensive income	(960)			(960)			(960)			(960)		(960)
Issuance of common shares	4,592	2	4,590
Contributions from noncontrolling interests	590					590	590				590
Capital contribution from the General Partner							4,772	4,772				4,772
Stock based compensation plan activity	7,959	8	7,256		(1,463)	2,158	7,959	5,801	2,158			7,959
Conversion of Limited Partner Units		2	2,414			(2,416)		2,416	(2,416)
Distributions to Partners'							(177,815)	(175,967)	(1,848)			(177,815)
Distributions to common shareholders	(175,967)				(175,967)
Distributions to noncontrolling interests	(1,993)					(1,993)	(145)				(145)
Ending Balance - General Partner at Sep. 30, 2015	$ 3,311,443	$ 3,453	$ 4,959,060	$ 2,066	$ (1,677,314)	$ 24,178
Ending Balance - Partnership at Sep. 30, 2015							$ 3,311,443	$ 3,285,199	$ 21,395	$ 2,066	$ 2,783	$ 3,308,660

Consolidated Statement of Chan7

Consolidated Statement of Changes in Equity (Parenthetical)	9 Months Ended
	Sep. 30, 2015$ / shares
Distributions to common shareholders, per share	$ 0.51
Duke Realty Limited Partnership [Member]
Distributions to Partners, per Common Unit	$ 0.51

General Basis of Presentation (

General Basis of Presentation (Notes)	9 Months Ended
	Sep. 30, 2015
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 "General Partner") and Duke Realty Limited Partnership (the "Partnership"). In this Report, unless the context indicates otherwise, the terms "Company," "we," "us" and "our" refer to the General Partner and the Partnership, collectively, and those entities owned or controlled by the General Partner and/or the Partnership. The 2014 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 the combined Annual Report on Form 10-K of the General Partner and the Partnership for the year ended December 31, 2014 , 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 the combined Annual Report on Form 10-K of the General Partner and the Partnership for the year ended December 31, 2014 . The General Partner was formed in 1985, and we believe that it qualifies as a real estate investment trust ("REIT") under the provisions of the Internal Revenue Code of 1986, as amended (the "Code"). The Partnership was formed on October 4, 1993, when the General Partner contributed all of its properties and related assets and liabilities, together with the net proceeds from an offering of additional shares of its common stock, to the Partnership. Simultaneously, the Partnership completed the acquisition of Duke Associates, a full-service commercial real estate firm operating in the Midwest whose operations began in 1972. The General Partner is the sole general partner of the Partnership, owning approximately 99.0% of the common partnership interests of the Partnership ("General Partner Units") at September 30, 2015 . The remaining 1.0% of the common partnership interests ("Limited Partner Units" and, together with the General Partner Units, the "Common Units") are owned by limited partners. As the sole general partner of the Partnership, the General Partner has full, exclusive and complete responsibility and discretion in the day-to-day management and control of the Partnership. The General Partner and the Partnership are operated as one enterprise. The management of the General Partner consists of the same members as the management of the Partnership. As the sole general partner with control of the Partnership, the General Partner consolidates the Partnership for financial reporting purposes, and the General Partner does not have any significant assets other than its investment in the Partnership. Therefore, the assets and liabilities of the General Partner and the Partnership are substantially the same. Limited Partners have the right to redeem their Limited Partner Units, subject to certain restrictions. Pursuant to the Fifth Amended and Restated Agreement of Limited Partnership, as amended (the "Partnership Agreement"), the General Partner is obligated to redeem the Limited Partner Units in shares of its common stock, unless it determines in its reasonable discretion that the issuance of shares of its common stock could cause it to fail to qualify as a REIT. Each Limited Partner Unit shall be redeemed for one share of the General Partner's common stock, or, in the event that the issuance of shares could cause the General Partner to fail to qualify as a REIT, cash equal to the fair market value of one share of the General Partner's common stock at the time of redemption, in each case, subject to certain adjustments described in the Partnership Agreement. The Limited Partner Units are not required, per the terms of the Partnership Agreement, to be redeemed in registered shares of the General Partner. The General Partner also owns preferred partnership interests in the Partnership ("Preferred Units"), to the extent the Partnership has issued Preferred Units. As of September 30, 2015 , we owned and operated a portfolio primarily consisting of industrial, medical office and office properties and provided real estate services to third-party owners. Substantially all of our Rental Operations (see Note 10) are conducted through the Partnership. We conduct our Service Operations (see Note 10) 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 the General Partner and the Partnership. 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.

New Accounting Pronouncement (N

New Accounting Pronouncement (Notes)	9 Months Ended
	Sep. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements Revenue Recognition In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"). ASU 2014-09 is a comprehensive revenue recognition standard that will supersede nearly all existing GAAP revenue recognition guidance as well as impact the existing GAAP guidance governing the sale of nonfinancial assets. The standard’s core principle is that a company will recognize revenue when it satisfies performance obligations, by transferring promised goods or services to customers, in an amount that reflects the consideration to which the company expects to be entitled in exchange for fulfilling those performance obligations. In doing so, companies will need to exercise more judgment and make more estimates than under existing GAAP guidance. ASU 2014-09 will be effective for public entities for annual and interim reporting periods beginning after December 15, 2017 and early adoption is permitted in periods ending after December 15, 2016. ASU 2014-09 allows for either recognizing the cumulative effect of application (i) at the start of the earliest comparative period presented (with the option to use any or all of three practical expedients) or (ii) at the date of initial application, with no restatement of comparative periods presented. We have not yet selected a transition method nor have we determined the effect of ASU 2014-09 on our consolidated financial statements. Consolidation In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis ("ASU 2015-02"). ASU 2015-02 makes targeted amendments to the current consolidation guidance and ends the deferral granted to investment companies from applying the existing variable interest entity guidance. ASU 2015-02 will be effective for public entities for annual and interim reporting periods beginning after December 15, 2015 with early adoption allowed in any interim period. We have not yet selected a transition method and are currently assessing the effect of ASU 2015-02 on our consolidated financial statements. Debt Issuance Costs In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"). ASU 2015-03 will require that debt issuance costs related to a recognized debt liability, which are currently presented as deferred charges (assets), be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. ASU 2015-03 will be effective for financial statements issued for fiscal years beginning after December 15, 2015, and for interim periods within those fiscal years. We do not expect ASU 2015-03 to have a material effect on our consolidated financial statements. Business Combinations In September 2015, the FASB issued ASU 2015-16, Business Combinations - Simplifying the Accounting for Measurement-Period Adjustments ("ASU 2015-16"). ASU 2015-16 amends the retroactive requirement to apply adjustments made to provisional amounts recognized in a business combination. The update requires that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. ASU 2015-16 will be effective for financial statements issued for fiscal years beginning after December 15, 2015, and for interim periods within those fiscal years. We do not expect ASU 2015-16 to have a material effect on our consolidated financial statements.

Reclassifications

Reclassifications	9 Months Ended
	Sep. 30, 2015
Disclosure Text Block [Abstract]
Reclassifications	Reclassifications Certain amounts in the accompanying consolidated financial statements for 2014 have been reclassified to conform to the 2015 consolidated financial statement presentation.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2015
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Consolidation Policy for VIEs	Variable Interest Entities We have equity interests in unconsolidated joint ventures that primarily own and operate rental properties or hold land for development. We consolidate those joint ventures that are considered to be variable interest entities ("VIE"s) where we are the primary beneficiary. We analyze our investments in joint ventures to determine if the joint venture is considered a VIE and would require consolidation. We (i) evaluate the sufficiency of the total equity investment 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. To the extent that we own interests in a VIE and we (i) are the sole entity that has the power to direct the activities of the VIE and (ii) have the obligation or rights to absorb the VIE's losses or receive its benefits, then we would be determined to be the primary beneficiary and would consolidate the VIE. To the extent we own interest in a VIE, then at each reporting period, we re-assess our conclusions as to which, if any, party within the VIE is considered the primary beneficiary. There were no consolidated or unconsolidated joint ventures, in which we have any recognized assets or liabilities or have retained any economic exposure to loss at September 30, 2015 that met the criteria to be considered VIEs. Our maximum loss exposure for guarantees of joint venture indebtedness, for joint ventures that are not VIEs, totaled $80.2 million at September 30, 2015 .

Acquisitions and Dispositions

Acquisitions and Dispositions	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Acquisitions and dispositions for the periods presented were completed in accordance with our strategy to reposition our investment concentration among product types and further diversify our geographic presence. With the exception of certain properties that have been sold or classified as held for sale, the results of operations for all acquired properties have been included in continuing operations within our consolidated financial statements since their respective dates of acquisition. Acquisitions We acquired two industrial properties during the nine months ended September 30, 2015 . One of the acquired properties had in place leases at the date of acquisition and was accounted for as a business combination, while there were no in place leases in the other property, which was accounted for as an asset acquisition. The following table summarizes amounts recognized for each major class of asset and liability (in thousands) for these acquisitions: Real estate assets $ 26,276 Lease related intangible assets 2,001 Total acquired assets 28,277 Other liabilities 319 Total assumed liabilities 319 Fair value of acquired net assets $ 27,958 Acquired leases had an average remaining life at acquisition of approximately 9.2 years. We have included $450,000 in rental revenues and $69,000 in income from continuing operations during the nine months ended September 30, 2015 for the properties since their respective dates of acquisition. Fair Value Measurements The fair value estimates used in allocating the aggregate purchase price of an acquisition, to the extent accounted for as a business combination, among the individual components of real estate assets and liabilities were determined primarily through calculating the "as-if vacant" value of a building, using the income approach, and relied significantly upon internally determined assumptions. We have determined that these estimates primarily rely upon Level 3 inputs, which are unobservable inputs based on our own assumptions. The most significant assumptions utilized in making the lease-up and future disposition estimates used in calculating the "as-if vacant" value for acquisition activity during the nine months ended September 30, 2015 are as follows: Discount rate 7.07% Exit capitalization rate 5.57% Lease-up period (months) 12 Net rental rate per square foot - Industrial $4.85 Acquisition-Related Activity The acquisition-related activity in our consolidated Statements of Operations and Comprehensive Income consisted of adjustments to the fair value of contingent consideration from acquisitions after the measurement period was complete and transaction costs for completed acquisitions. Dispositions Dispositions of buildings (see Note 11 for the number of buildings sold as well as for their classification between continuing and discontinued operations) and undeveloped land generated net cash proceeds of $1.53 billion and $386.2 million during the nine months ended September 30, 2015 and 2014 , respectively. On April 1, 2015, we completed the previously announced suburban office portfolio sale (the "Suburban Office Portfolio Sale") to a joint venture with affiliates of Starwood Capital Group, Vanderbilt Partners and Trinity Capital Advisors for approximately $1.07 billion in proceeds and recorded a gain on sale of $398.6 million . The Suburban Office Portfolio Sale included all of our wholly-owned, in-service suburban office properties located in Nashville, Raleigh, South Florida and St. Louis. The portfolio included approximately 6.7 million square feet across 61 buildings and 57 acres of undeveloped land. Additionally, an office asset currently under construction in Raleigh is expected to be sold upon completion in late 2015 or early 2016. A portion of the purchase price for the Suburban Office Portfolio Sale was financed through a $200.0 million first mortgage on certain of the properties in the Suburban Office Portfolio that we provided to the seller. The first mortgage matures on December 31, 2016, is prepayable after January 1, 2016, and bears interest at LIBOR plus 1.5% . We have reviewed the creditworthiness of the entities with which we hold this first mortgage and have concluded it is probable that we will be able to collect all amounts due according to its contractual terms. On April 8, 2015, we completed the sale of 51 non-strategic industrial properties for $270.0 million in proceeds and recorded a gain on sale of $107.3 million . These properties totaled 5.2 million square feet and were located in primarily Midwest markets.

Indebtedness

Indebtedness	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Indebtedness	Indebtedness All debt is held directly or indirectly by the Partnership. The General Partner does not have any indebtedness, but does guarantee some of the unsecured debt of the Partnership. The following table summarizes the book value and changes in the fair value, of our debt for the nine months ended September 30, 2015 (in thousands): Book Value at 12/31/2014 Book Value at 9/30/2015 Fair Value at 12/31/2014 Payments/Payoffs Adjustments to Fair Value Fair Value at 9/30/2015 Fixed rate secured debt $ 979,842 $ 761,607 $ 1,065,301 $ (216,532 ) $ (21,995 ) $ 826,774 Variable rate secured debt 3,400 3,100 3,400 (300 ) — 3,100 Unsecured debt 3,364,161 2,681,313 3,603,475 (682,848 ) (120,237 ) 2,800,390 Unsecured line of credit 106,000 — 106,000 (106,000 ) — — Total $ 4,453,403 $ 3,446,020 $ 4,778,176 $ (1,005,680 ) $ (142,232 ) $ 3,630,264 Less secured debt related to real estate assets held-for-sale 40,764 — Total indebtedness as reported on consolidated balance sheets $ 4,412,639 $ 3,446,020 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 2.20% to 3.60% , 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. During the nine months ended September 30, 2015 , we repaid sixteen secured loans, totaling $208.9 million . These loans had a weighted average stated interest rate of 5.36% . Certain of these secured loans were repaid prior to their scheduled maturity date, which resulted in a $3.7 million loss on extinguishment, which included both prepayment penalties as well as the write-off of unamortized deferred loan and mark to market costs. Unsecured Debt At September 30, 2015 , with the exception of one variable rate term note, all of our unsecured debt bore interest at fixed rates and primarily consisted of unsecured notes that are publicly traded. 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. The estimated trading values of our fixed rate unsecured debt, depending on the maturity and coupon rates, ranged from 98.00% to 120.00% of face value. We utilize a discounted cash flow methodology in order to estimate the fair value of our $250.0 million variable rate term loan. 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 was based on estimated market spreads and the quoted yields on federal government treasury securities with similar maturity dates. Our estimate of the current market rate for our variable rate term loan was 1.35% and was based primarily upon Level 3 inputs. In February 2015, we repaid a $250.0 million senior unsecured note at its maturity date. This loan had a stated interest rate of 7.38% and an effective rate of 7.50% . In April 2015, the Partnership completed a tender offer (the "Tender Offer") to purchase, for a combined aggregate purchase price (exclusive of accrued and unpaid interest) of up to $500.0 million , certain of its outstanding series of unsecured notes. A portion of the proceeds from the Suburban Office Portfolio Sale were used to fund the Tender Offer, which resulted in the repurchase of notes having a face value of $424.9 million , for a cash payment of $500.0 million . The repurchased notes had contractual maturity dates ranging between February 2017 and March 2020 and bore interest at stated rates ranging between 5.95% and 8.25% . Additionally, in May 2015, we repurchased unsecured notes with a face value of $6.3 million , for a cash payment of $7.1 million . These notes had a stated interest rate of 6.50% and an effective rate of 6.08% . The early repayment of unsecured notes, either through the Tender Offer or repurchase, resulted in an aggregate loss on extinguishment of $78.9 million , which included applicable repurchase premiums as well as the write-off of unamortized deferred loan costs. 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 at September 30, 2015 . Unsecured Line of Credit Our unsecured line of credit at September 30, 2015 is described as follows (in thousands): Description Maximum Capacity Maturity Date Outstanding Balance at September 30, 2015 Unsecured Line of Credit - Partnership $ 1,200,000 January 2019 $ — The Partnership's unsecured line of credit has an interest rate on borrowings of LIBOR plus 1.05% and a maturity date of January 2019 . 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 $1.6 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 Partnership's unsecured line of credit agreement). At September 30, 2015 , we were in compliance with all covenants under this line of credit.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2015
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders' Equity of the General Partner and Partners' Capital of the Partnership General Partner During the nine months ended September 30, 2015 , the General Partner issued 233,000 common shares pursuant to its at the market equity program, generating gross proceeds of approximately $5.0 million and, after deducting commissions and other costs, net proceeds of approximately $4.6 million . The proceeds from these offerings were contributed to the Partnership and used for general corporate purposes. Partnership For each common share or preferred share that the General Partner issues, the Partnership issues a corresponding General Partner Unit or Preferred Unit, as applicable, to the General Partner in exchange for the contribution of the proceeds from the stock issuance. Similarly, when the General Partner redeems or repurchases common shares or preferred shares, the Partnership redeems the corresponding Common Units or Preferred Units held by the General Partner at the same price.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2015
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 have eliminated our ownership percentage of these fees in the consolidated financial statements. The following table summarizes the fees earned from these companies, prior to the elimination of our ownership percentage, for the three and nine months ended September 30, 2015 and 2014 , respectively (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Management fees $ 1,835 $ 2,233 $ 5,388 $ 6,569 Leasing fees 692 572 1,714 3,085 Construction and development fees 2,247 1,529 3,377 4,911

Net Income (Loss) Per Common Sh

Net Income (Loss) Per Common Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Per Common Share	Net Income (Loss) Per Common Share or Common Unit Basic net income (loss) per common share or Common Unit is computed by dividing net income (loss) attributable to common shareholders or common unitholders, less dividends or distributions 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 or Common Units 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 Limited Partner Units (to the extent the Limited Partner Units are dilutive) by the sum of the weighted average number of common shares outstanding and, to the extent they are dilutive, Units outstanding and any potential dilutive securities for the period. Diluted net income (loss) per Common Unit is computed by dividing the basic net income (loss) attributable to common unitholders by the sum of the weighted average number of Common Units outstanding and any potential dilutive securities for the period. The following table reconciles the components of basic and diluted net income per common share or Common Unit for the three and nine months ended September 30, 2015 and 2014 , respectively (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 General Partner Net income attributable to common shareholders $ 76,434 $ 61,533 $ 591,058 $ 207,904 Less: Dividends on participating securities (593 ) (651 ) (1,803 ) (1,941 ) Basic net income attributable to common shareholders 75,841 60,882 589,255 205,963 Add back dividends on dilutive participating securities 593 — 1,803 — Noncontrolling interest in earnings of common unitholders 751 795 6,212 2,738 Diluted net income attributable to common shareholders $ 77,185 $ 61,677 $ 597,270 $ 208,701 Weighted average number of common shares outstanding 345,256 341,165 344,986 333,393 Weighted average Limited Partner Units outstanding 3,504 4,380 3,609 4,384 Other potential dilutive shares 3,390 281 3,418 280 Weighted average number of common shares and potential dilutive securities 352,150 345,826 352,013 338,057 Partnership Net income attributable to common unitholders $ 77,185 $ 62,328 $ 597,270 $ 210,642 Less: Distributions on participating securities (593 ) (651 ) (1,803 ) (1,941 ) Basic net income attributable to common unitholders $ 76,592 $ 61,677 $ 595,467 $ 208,701 Add back distributions on dilutive participating securities 593 — 1,803 — Diluted net income attributable to common unitholders $ 77,185 $ 61,677 $ 597,270 $ 208,701 Weighted average number of Common Units outstanding 348,760 345,545 348,595 337,777 Other potential dilutive units 3,390 281 3,418 280 Weighted average number of Common Units and potential dilutive securities 352,150 345,826 352,013 338,057 The following table summarizes the data that is excluded from the computation of net income per common share or Common Unit as a result of being anti-dilutive (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 General Partner and Partnership Potential dilutive shares or units: Anti-dilutive outstanding potential shares or units under fixed stock option and other stock-based compensation plans 997 1,215 997 1,215 Outstanding participating securities — 3,867 — 3,867

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting Reportable Segments We had four reportable operating segments at September 30, 2015 , the first three of which consist of the ownership and rental of (i) industrial, (ii) medical office and (iii) office real estate investments. The operations of our industrial, medical office and office properties, along with our retail properties, are collectively referred to as "Rental Operations." Properties not included in our reportable segments, which do not by themselves meet the quantitative thresholds for separate presentation as a reportable segment, are referred to as non-reportable Rental Operations. The fourth reportable segment consists of various real estate services such as property management, asset management, maintenance, leasing, development, general contracting 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. Revenues by Reportable Segment The following table shows the revenues for each of the reportable segments, as well as a reconciliation to consolidated revenues, for the three and nine months ended September 30, 2015 and 2014 , respectively (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Revenues Rental Operations: Industrial $ 136,276 $ 130,495 $ 419,391 $ 392,048 Medical Office 39,911 36,715 120,213 104,979 Office 23,277 32,134 72,103 109,700 Non-reportable Rental Operations — 1,698 — 5,414 Service Operations 33,599 59,739 110,320 185,072 Total segment revenues 233,063 260,781 722,027 797,213 Other revenue (loss) 1,474 1,025 5,842 3,352 Consolidated revenue from continuing operations 234,537 261,806 727,869 800,565 Discontinued operations 7 29,709 32,171 89,112 Consolidated revenue $ 234,544 $ 291,515 $ 760,040 $ 889,677 Supplemental Performance Measure Property level net operating income on a cash basis ("PNOI") is the non-GAAP supplemental performance measure that we use to evaluate the performance of, and to allocate resources among, the real estate investments in the reportable and operating segments that comprise our Rental Operations. PNOI for our Rental Operations segments is comprised of rental revenues from continuing operations less rental expenses and real estate taxes from continuing operations, along with certain other adjusting items (collectively referred to as "Rental Operations revenues and expenses excluded from PNOI," as shown in the following table). Additionally, we do not allocate interest expense, depreciation expense and certain other non-property specific revenues and expenses (collectively referred to as "Non-Segment Items," as shown in the following table) to our individual operating segments. We evaluate the performance of our Service Operations reportable segment using net income or loss, as allocated to that segment ("Earnings from Service Operations"). The following table shows a reconciliation of our segment-level measures of profitability to consolidated income from continuing operations before income taxes for the three and nine months ended September 30, 2015 and 2014 , respectively (in thousands and excluding discontinued operations): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 PNOI Industrial $ 99,236 $ 88,654 $ 291,987 $ 258,863 Medical Office 25,827 23,456 76,878 65,820 Office 11,791 13,688 36,364 37,851 Non-reportable Rental Operations — 970 — 3,275 PNOI, excluding all sold/held for sale properties 136,854 126,768 405,229 365,809 PNOI from sold/held-for-sale properties included in continuing operations 2,711 13,162 17,471 47,270 PNOI, continuing operations 139,565 139,930 422,700 413,079 Earnings from Service Operations 3,905 7,211 11,865 21,415 Rental Operations revenues and expenses excluded from PNOI: Straight-line rental income and expense, net 5,723 5,466 16,830 16,183 Revenues related to lease buyouts 408 145 1,366 4,365 Amortization of lease concessions and above and below market rents (357 ) (919 ) (2,559 ) (4,820 ) Intercompany rents and other adjusting items (434 ) (1,616 ) (1,306 ) (3,718 ) Non-Segment Items: Equity in earnings (loss) of unconsolidated companies (5,088 ) 19,178 16,281 82,325 Interest expense (41,615 ) (47,421 ) (134,576 ) (145,628 ) Depreciation expense (79,898 ) (85,772 ) (240,135 ) (262,570 ) Gain on sale of properties 71,259 47,143 202,153 133,617 Impairment charges on non-depreciable properties (2,426 ) (6,368 ) (7,896 ) (8,891 ) Interest and other income, net 1,343 356 3,056 936 General and administrative expenses (11,340 ) (10,573 ) (47,582 ) (35,632 ) Gain on land sales 1,659 3,167 24,096 7,208 Other operating expenses (1,467 ) (1,829 ) (4,579 ) (6,032 ) Gain (loss) on extinguishment of debt 64 — (82,589 ) (139 ) Acquisition-related activity (5,660 ) (110 ) (6,993 ) (871 ) Other non-segment revenues and expenses, net (1,806 ) (269 ) (2,065 ) (1,041 ) Income from continuing operations before income taxes $ 73,835 $ 67,719 $ 168,067 $ 209,786 The most comparable GAAP measure to PNOI is income from continuing operations before income taxes. PNOI excludes expenses that materially impact our overall results of operations and, therefore, should not be considered as a substitute for income from continuing operations before income taxes or any other measures derived in accordance with GAAP. Furthermore, PNOI may not be comparable to other similarly titled measures of other companies. Assets by Reportable Segment The assets for each of the reportable segments at September 30, 2015 and December 31, 2014 were as follows (in thousands): September 30, December 31, Assets Rental Operations: Industrial $ 4,501,662 $ 4,677,047 Medical Office 1,247,196 1,229,632 Office 483,641 1,252,627 Non-reportable Rental Operations — 71,741 Service Operations 140,103 158,762 Total segment assets 6,372,602 7,389,809 Non-segment assets 767,307 365,030 Consolidated assets $ 7,139,909 $ 7,754,839

Discontinued Operations and Ass

Discontinued Operations and Assets Held for Sale	9 Months Ended
	Sep. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations and Assets Held for Sale	Discontinued Operations and Assets Held-for-Sale Discontinued Operations Beginning with our adoption of ASU 2014-08 on April 1, 2014, discontinued operations presentation applies only to disposals representing a strategic shift that has (or will have) a major effect on an entity’s operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). On April 1, 2015, we completed the Suburban Office Portfolio Sale that had been under agreement for sale since late January 2015. Because of the size of this disposition, and the fact that it represented our exit from the office product type in four geographic markets, we determined that the disposition represented a strategic shift that would have a major effect on our operations and financial results. As such, the in-service properties in this portfolio met the criteria to be classified within discontinued operations. As the result of its classification within discontinued operations, the in-service assets and liabilities of this portfolio are required to be presented as held-for-sale for all prior periods presented in our Consolidated Balance Sheets. The following table illustrates the number of sold or held-for-sale properties included in, or excluded from, discontinued operations: Held-for-Sale at September 30, 2015 Sold through September 30, 2015 Sold in 2014 Total Industrial 0 5 11 16 Medical Office 0 1 1 2 Office 0 56 0 56 Total properties included in discontinued operations 0 62 12 74 Properties excluded from discontinued operations 1 78 17 96 Total properties sold or classified as held-for-sale 1 140 29 170 For the properties that were classified in discontinued operations, we allocated 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 operational results of the buildings reflected in discontinued operations for the three and nine months ended September 30, 2015 and 2014 , respectively (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Revenues $ 7 $ 29,709 $ 32,171 $ 89,112 Operating expenses (50 ) (12,145 ) (12,449 ) (35,651 ) Depreciation and amortization — (9,228 ) (3,517 ) (28,335 ) Operating income (43 ) 8,336 16,205 25,126 Interest expense — (6,059 ) (5,659 ) (18,557 ) Income (loss) before gain on sales (43 ) 2,277 10,546 6,569 Gain on sale of depreciable properties 66 564 417,795 22,864 Income from discontinued operations before income taxes 23 2,841 428,341 29,433 Income tax benefit (expense) 45 555 (3,175 ) (2,969 ) Income from discontinued operations $ 68 $ 3,396 $ 425,166 $ 26,464 Capital expenditures on a cash basis for the nine months ended September 30, 2015 and 2014 were $7.4 million and $23.9 million , respectively, related to properties classified within discontinued operations. Allocation of Noncontrolling Interests - General Partner The following table illustrates the General Partner's share of the income attributable to common shareholders from continuing operations and discontinued operations, reduced by the allocation of income between continuing and discontinued operations to the Limited Partner Units, for the three and nine months ended September 30, 2015 and 2014 , respectively (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Income from continuing operations attributable to common shareholders $ 76,367 $ 58,180 $ 170,294 $ 181,783 Income from discontinued operations attributable to common shareholders 67 3,353 420,764 26,121 Net income attributable to common shareholders $ 76,434 $ 61,533 $ 591,058 $ 207,904 Allocation of Noncontrolling Interests - Partnership Substantially all of the income from discontinued operations for all periods presented in the Partnership's Consolidated Statements of Operations and Comprehensive Income is attributable to the common unitholders. Properties Held-for-Sale At September 30, 2015 , one in-service property and 39 acres of undeveloped land were classified as held-for-sale but did not meet the criteria to be classified within discontinued operations. The following table illustrates aggregate balance sheet information for all held-for-sale properties at September 30, 2015 and December 31, 2014 (in thousands): September 30, 2015 December 31, 2014 Held-for-Sale Properties Included in Continuing Operations Properties Included in Continuing Operations Properties Included in Discontinued Operations Total Held-For-Sale Properties Land and improvements $ 596 $ 21,347 $ 126,921 $ 148,268 Buildings and tenant improvements 8,039 36,925 721,398 758,323 Undeveloped land 6,349 12,443 — 12,443 Accumulated depreciation (6,283 ) (23,071 ) (247,269 ) (270,340 ) Deferred leasing and other costs, net 67 3,480 44,840 48,320 Other assets 152 562 27,475 28,037 Total assets held-for-sale $ 8,920 $ 51,686 $ 673,365 $ 725,051 Secured debt $ — $ — $ 40,764 $ 40,764 Accrued expenses 183 233 5,180 5,413 Other liabilities 42 434 12,481 12,915 Total liabilities held-for-sale $ 225 $ 667 $ 58,425 $ 59,092

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Declaration of Dividends/Distributions The General Partner's board of directors declared the following dividends/distributions, including a special cash dividend of $0.20 per share, at its regularly scheduled board meeting held on October 28, 2015 : Class of stock/units Quarterly Amount per Share or Unit Record Date Payment Date Common - Quarterly $0.18 November 16, 2015 November 30, 2015 Common - Special $0.20 November 16, 2015 December 15, 2015 The special cash dividend was primarily the result of the significant taxable gains on asset sales completed thus far in 2015. Debt Extinguishment In October 2015 we redeemed $150.0 million in unsecured notes that had a scheduled maturity in March of 2016. We will recognize a net loss on the extinguishment of these notes in the fourth quarter totaling $3.1 million , which is comprised of a make-whole payment to the bondholders as well as the write-off of unamortized deferred financing costs. The repurchase was completed on October 30, 2015.

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	9 Months Ended
	Sep. 30, 2015
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	Real estate assets $ 26,276 Lease related intangible assets 2,001 Total acquired assets 28,277 Other liabilities 319 Total assumed liabilities 319 Fair value of acquired net assets $ 27,958
Summary of Most Significant Assumptions Utilized in the Estimations [Table Text Block]	Discount rate 7.07% Exit capitalization rate 5.57% Lease-up period (months) 12 Net rental rate per square foot - Industrial $4.85

Indebtedness (Tables)

Indebtedness (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Fair Value, Liabilities Measured on a Recurring Basis, Disclosure Only	Book Value at 12/31/2014 Book Value at 9/30/2015 Fair Value at 12/31/2014 Payments/Payoffs Adjustments to Fair Value Fair Value at 9/30/2015 Fixed rate secured debt $ 979,842 $ 761,607 $ 1,065,301 $ (216,532 ) $ (21,995 ) $ 826,774 Variable rate secured debt 3,400 3,100 3,400 (300 ) — 3,100 Unsecured debt 3,364,161 2,681,313 3,603,475 (682,848 ) (120,237 ) 2,800,390 Unsecured line of credit 106,000 — 106,000 (106,000 ) — — Total $ 4,453,403 $ 3,446,020 $ 4,778,176 $ (1,005,680 ) $ (142,232 ) $ 3,630,264 Less secured debt related to real estate assets held-for-sale 40,764 — Total indebtedness as reported on consolidated balance sheets $ 4,412,639 $ 3,446,020
Unsecured Line of Credit	Description Maximum Capacity Maturity Date Outstanding Balance at September 30, 2015 Unsecured Line of Credit - Partnership $ 1,200,000 January 2019 $ —

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2015
Related Party Transactions [Abstract]
Schedule of Fees Earned from Related Parties	Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Management fees $ 1,835 $ 2,233 $ 5,388 $ 6,569 Leasing fees 692 572 1,714 3,085 Construction and development fees 2,247 1,529 3,377 4,911

Net Income (Loss) Per Common 23

Net Income (Loss) Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share	Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 General Partner Net income attributable to common shareholders $ 76,434 $ 61,533 $ 591,058 $ 207,904 Less: Dividends on participating securities (593 ) (651 ) (1,803 ) (1,941 ) Basic net income attributable to common shareholders 75,841 60,882 589,255 205,963 Add back dividends on dilutive participating securities 593 — 1,803 — Noncontrolling interest in earnings of common unitholders 751 795 6,212 2,738 Diluted net income attributable to common shareholders $ 77,185 $ 61,677 $ 597,270 $ 208,701 Weighted average number of common shares outstanding 345,256 341,165 344,986 333,393 Weighted average Limited Partner Units outstanding 3,504 4,380 3,609 4,384 Other potential dilutive shares 3,390 281 3,418 280 Weighted average number of common shares and potential dilutive securities 352,150 345,826 352,013 338,057 Partnership Net income attributable to common unitholders $ 77,185 $ 62,328 $ 597,270 $ 210,642 Less: Distributions on participating securities (593 ) (651 ) (1,803 ) (1,941 ) Basic net income attributable to common unitholders $ 76,592 $ 61,677 $ 595,467 $ 208,701 Add back distributions on dilutive participating securities 593 — 1,803 — Diluted net income attributable to common unitholders $ 77,185 $ 61,677 $ 597,270 $ 208,701 Weighted average number of Common Units outstanding 348,760 345,545 348,595 337,777 Other potential dilutive units 3,390 281 3,418 280 Weighted average number of Common Units and potential dilutive securities 352,150 345,826 352,013 338,057
Computation of Anti-Dilutive Common Share	Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 General Partner and Partnership Potential dilutive shares or units: Anti-dilutive outstanding potential shares or units under fixed stock option and other stock-based compensation plans 997 1,215 997 1,215 Outstanding participating securities — 3,867 — 3,867

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Revenues Rental Operations: Industrial $ 136,276 $ 130,495 $ 419,391 $ 392,048 Medical Office 39,911 36,715 120,213 104,979 Office 23,277 32,134 72,103 109,700 Non-reportable Rental Operations — 1,698 — 5,414 Service Operations 33,599 59,739 110,320 185,072 Total segment revenues 233,063 260,781 722,027 797,213 Other revenue (loss) 1,474 1,025 5,842 3,352 Consolidated revenue from continuing operations 234,537 261,806 727,869 800,565 Discontinued operations 7 29,709 32,171 89,112 Consolidated revenue $ 234,544 $ 291,515 $ 760,040 $ 889,677
Summary of Net Operation Income	Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 PNOI Industrial $ 99,236 $ 88,654 $ 291,987 $ 258,863 Medical Office 25,827 23,456 76,878 65,820 Office 11,791 13,688 36,364 37,851 Non-reportable Rental Operations — 970 — 3,275 PNOI, excluding all sold/held for sale properties 136,854 126,768 405,229 365,809 PNOI from sold/held-for-sale properties included in continuing operations 2,711 13,162 17,471 47,270 PNOI, continuing operations 139,565 139,930 422,700 413,079 Earnings from Service Operations 3,905 7,211 11,865 21,415 Rental Operations revenues and expenses excluded from PNOI: Straight-line rental income and expense, net 5,723 5,466 16,830 16,183 Revenues related to lease buyouts 408 145 1,366 4,365 Amortization of lease concessions and above and below market rents (357 ) (919 ) (2,559 ) (4,820 ) Intercompany rents and other adjusting items (434 ) (1,616 ) (1,306 ) (3,718 ) Non-Segment Items: Equity in earnings (loss) of unconsolidated companies (5,088 ) 19,178 16,281 82,325 Interest expense (41,615 ) (47,421 ) (134,576 ) (145,628 ) Depreciation expense (79,898 ) (85,772 ) (240,135 ) (262,570 ) Gain on sale of properties 71,259 47,143 202,153 133,617 Impairment charges on non-depreciable properties (2,426 ) (6,368 ) (7,896 ) (8,891 ) Interest and other income, net 1,343 356 3,056 936 General and administrative expenses (11,340 ) (10,573 ) (47,582 ) (35,632 ) Gain on land sales 1,659 3,167 24,096 7,208 Other operating expenses (1,467 ) (1,829 ) (4,579 ) (6,032 ) Gain (loss) on extinguishment of debt 64 — (82,589 ) (139 ) Acquisition-related activity (5,660 ) (110 ) (6,993 ) (871 ) Other non-segment revenues and expenses, net (1,806 ) (269 ) (2,065 ) (1,041 ) Income from continuing operations before income taxes $ 73,835 $ 67,719 $ 168,067 $ 209,786
Reportable Segments Consolidated Assets	September 30, December 31, Assets Rental Operations: Industrial $ 4,501,662 $ 4,677,047 Medical Office 1,247,196 1,229,632 Office 483,641 1,252,627 Non-reportable Rental Operations — 71,741 Service Operations 140,103 158,762 Total segment assets 6,372,602 7,389,809 Non-segment assets 767,307 365,030 Consolidated assets $ 7,139,909 $ 7,754,839

Discontinued Operations and A25

Discontinued Operations and Assets Held for Sale (Tables)	9 Months Ended
	Sep. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Table Illustration of Number of Properties in Discontinued Operations	Held-for-Sale at September 30, 2015 Sold through September 30, 2015 Sold in 2014 Total Industrial 0 5 11 16 Medical Office 0 1 1 2 Office 0 56 0 56 Total properties included in discontinued operations 0 62 12 74 Properties excluded from discontinued operations 1 78 17 96 Total properties sold or classified as held-for-sale 1 140 29 170
Table Illustration of Discontinued Operations in Statement of Operations	Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Revenues $ 7 $ 29,709 $ 32,171 $ 89,112 Operating expenses (50 ) (12,145 ) (12,449 ) (35,651 ) Depreciation and amortization — (9,228 ) (3,517 ) (28,335 ) Operating income (43 ) 8,336 16,205 25,126 Interest expense — (6,059 ) (5,659 ) (18,557 ) Income (loss) before gain on sales (43 ) 2,277 10,546 6,569 Gain on sale of depreciable properties 66 564 417,795 22,864 Income from discontinued operations before income taxes 23 2,841 428,341 29,433 Income tax benefit (expense) 45 555 (3,175 ) (2,969 ) Income from discontinued operations $ 68 $ 3,396 $ 425,166 $ 26,464
Allocation of Common Shareholders' Income (Loss) Between Continuing and Discontinued Operations	Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Income from continuing operations attributable to common shareholders $ 76,367 $ 58,180 $ 170,294 $ 181,783 Income from discontinued operations attributable to common shareholders 67 3,353 420,764 26,121 Net income attributable to common shareholders $ 76,434 $ 61,533 $ 591,058 $ 207,904
Schedule of Discontinued Operations, Properties Held-for-Sale, Aggregate Balance Sheet Information [Table Text Block]	The following table illustrates aggregate balance sheet information for all held-for-sale properties at September 30, 2015 and December 31, 2014 (in thousands): September 30, 2015 December 31, 2014 Held-for-Sale Properties Included in Continuing Operations Properties Included in Continuing Operations Properties Included in Discontinued Operations Total Held-For-Sale Properties Land and improvements $ 596 $ 21,347 $ 126,921 $ 148,268 Buildings and tenant improvements 8,039 36,925 721,398 758,323 Undeveloped land 6,349 12,443 — 12,443 Accumulated depreciation (6,283 ) (23,071 ) (247,269 ) (270,340 ) Deferred leasing and other costs, net 67 3,480 44,840 48,320 Other assets 152 562 27,475 28,037 Total assets held-for-sale $ 8,920 $ 51,686 $ 673,365 $ 725,051 Secured debt $ — $ — $ 40,764 $ 40,764 Accrued expenses 183 233 5,180 5,413 Other liabilities 42 434 12,481 12,915 Total liabilities held-for-sale $ 225 $ 667 $ 58,425 $ 59,092

Subsequent Events (Tables)

Subsequent Events (Tables)	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Schedule of Dividends Declared	Class of stock/units Quarterly Amount per Share or Unit Record Date Payment Date Common - Quarterly $0.18 November 16, 2015 November 30, 2015 Common - Special $0.20 November 16, 2015 December 15, 2015

General Basis of Presentation27

General Basis of Presentation (Details)	9 Months Ended
	Sep. 30, 2015
Common partnership interests of DRLP Owned	99.00%
Duke Realty Limited Partnership [Member]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	1.00%

Variable Interest Entities (Bal

Variable Interest Entities (Balances Related to Joint Ventures) (Details) $ in Millions	Sep. 30, 2015USD ($)
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Maximum Guarantee Exposure for Joint Venture Loans	$ 80.2

Acquisitions and Dispositions29

Acquisitions and Dispositions (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)buildings	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)buildings	Sep. 30, 2014USD ($)
Operating Income (Loss)	$ 119,703,000	$ 114,894,000	$ 389,169,000	$ 355,488,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years 2 months 1 day
Operating Leases, Income Statement, Lease Revenue	$ 200,938,000	$ 202,067,000	$ 617,549,000	$ 615,493,000
Industrial [Member]
Number Of Real Estate Properties Acquired | buildings	2		2
Other 2015 Acquisitions [Member]
Operating Income (Loss)			$ 69,000
Operating Leases, Income Statement, Lease Revenue			$ 450,000

Acquisitions and Dispositions30

Acquisitions and Dispositions (Summary of Allocation of Fair Value of Amounts Recognized) (Details) $ in Thousands	Sep. 30, 2015USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings	$ 26,276
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	2,001
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	28,277
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	319
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	319
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 27,958

Acquisitions and Dispositions31

Acquisitions and Dispositions (Summary of Significant Assumptions Utilized in Estimates) (Details)	9 Months Ended
	Sep. 30, 2015$ / sqftmonths
Business Acquisition [Line Items]
Fair Value Inputs, Discount Rate	7.07%
Fair Value Inputs, Cap Rate	5.57%
Fair Value Measurement With Unobservable Inputs Lease up Period in Months | months	12
Industrial [Member]
Business Acquisition [Line Items]
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot	4.85

Acquisitions and Dispositions D

Acquisitions and Dispositions Dispositions (Details) $ in Thousands, sqft in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015USD ($)asqft	Sep. 30, 2015USD ($)abuildings	Sep. 30, 2014USD ($)	Dec. 31, 2014buildings
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 1,534,177	$ 386,215
Number of Real Estate Properties Sold | buildings		140		29
Mortgage note receivable from buyer in property sale		$ 204,428	$ 0
Suburban Office Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 1,070,000
Gains (Losses) on Sale of Real Estate	$ 398,600
Square Footage Of Real Estate Properties Acquired Or Disposed | sqft	6.7
Number of Real Estate Properties Sold | buildings		61
Area of Land | a	57	57
Mortgage note receivable from buyer in property sale		$ 200,000
Industrial Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 270,000
Gains (Losses) on Sale of Real Estate	$ 107,300
Square Footage Of Real Estate Properties Acquired Or Disposed | sqft	5.2
Number of Real Estate Properties Sold | buildings		51
London Interbank Offered Rate (LIBOR) [Member] | Suburban Office Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
Debt Instrument, Basis Spread on Variable Rate		1.50%

Indebtedness (Summary of Book V

Indebtedness (Summary of Book Value and Changes in Fair Value of Debt) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Disposal Groups, Secured Debt Related to Assets Held for Sale		$ 40,764
Book value	$ 3,446,020	4,412,639
Fair value	3,630,264	4,778,176
Long Term Debt Including Amounts Classified as Held for Sale	3,446,020	4,453,403
Payments/Payoffs	(1,005,680)
Adjustments to fair value	(142,232)
Fixed Rate Secured Debt [Member]
Book value	761,607	979,842
Fair value	826,774	1,065,301
Payments/Payoffs	(216,532)
Adjustments to fair value	(21,995)
Variable Rate Secured Debt [Member]
Book value	3,100	3,400
Fair value	3,100	3,400
Payments/Payoffs	(300)
Adjustments to fair value	0
Unsecured Debt [Member]
Book value	2,681,313	3,364,161
Fair value	2,800,390	3,603,475
Payments/Payoffs	(682,848)
Adjustments to fair value	(120,237)
Unsecured Line of Credit DRLP [Member]
Book value	0	106,000
Fair value	0	$ 106,000
Payments/Payoffs	(106,000)
Adjustments to fair value	$ 0

Indebtedness Secured Debt (Deta

Indebtedness Secured Debt (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)loans	Sep. 30, 2014USD ($)
Debt Instrument [Line Items]
Repayments of Secured Debt			$ 221,085	$ 93,036
Gains (Losses) on Extinguishment of Debt	$ 64	$ 0	$ (82,589)	$ (139)
Fixed Rate Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum			2.20%
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum			3.60%
Number of secured loans repaid | loans			16
Repayments of Secured Debt			$ 208,900
Repaid Debt, Weighted Average Interest Rate	5.36%		5.36%
Secured Debt [Member]
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt	$ 3,700

Indebtedness Unsecured Debt (De

Indebtedness Unsecured Debt (Details) $ in Thousands	May. 31, 2015USD ($)	Apr. 30, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)loans	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Number of Variable Rate Unsecured Loans | loans					1
Long-term Debt			$ 3,446,020		$ 3,446,020		$ 4,412,639
Debt Instrument, Interest Rate, Effective Percentage	6.08%
Gains (Losses) on Extinguishment of Debt			64	$ 0	(82,589)	$ (139)
Repayments of Unsecured Debt	$ 7,100	$ 500,000			759,948	$ 1,556
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Unsecured Debt			2,681,313		2,681,313		$ 3,364,161
Debt Instrument, Repurchased Face Amount	$ 6,300	$ 424,900
Variable Rate UnSecured Debt [Member] [Member]
Debt Instrument [Line Items]
Long-term Debt			$ 250,000		$ 250,000
Debt Instrument, Interest Rate, Effective Percentage			1.35%		1.35%
Fixed Rate Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum					98.00%
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum					120.00%
Debt Instrument, Covenant Compliance					We were in compliance with all such covenants at September 30, 2015
Fixed Rate Unsecured Debt Repaid [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			7.50%		7.50%
Repayments of Unsecured Debt					$ 250,000
Debt Instrument, Interest Rate, Stated Percentage			7.38%		7.38%
Tender Offer [Member]
Debt Instrument [Line Items]
Unsecured Debt			$ 500,000		$ 500,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt			$ 78,900
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.95%
Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.25%

Indebtedness (Unsecured Line of

Indebtedness (Unsecured Line of Credit) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Line of credit balance	$ 0	$ 106,000
Unsecured Line of Credit DRLP [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,600,000
Line of Credit Facility, Covenant Compliance	we were in compliance with all covenants under this line of credit.
Line of Credit Facility Option to Increase Borrowing Limit	$ 400,000
Unsecured Line of Credit DRLP [Member] | Unsecured Line of Credit DRLP [Member]
Maximum Capacity	$ 1,200,000
Maturity date	Jan. 1, 2019
Line of credit balance	$ 0
Unsecured Line of Credit DRLP [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.05%

Shareholders' Equity Shareholde

Shareholders' Equity Shareholders' Equity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Issuance of common shares	$ 4,592	$ 255,962
At-the-market equity issuance [Member]
Stock Issued During Period, Shares, New Issues	233,000
Issuance of common shares	$ 4,600
At-the-market equity issuance [Member] | Gross Proceeds [Member]
Issuance of common shares	$ 5,000

Related Party Transactions (Sch

Related Party Transactions (Schedule of Fees Earned from Related Parties) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Management Fees [Member]
Revenue from related party transactions	$ 1,835	$ 2,233	$ 5,388	$ 6,569
Leasing Fees [Member]
Revenue from related party transactions	692	572	1,714	3,085
Construction and Development Fees [Member]
Revenue from related party transactions	$ 2,247	$ 1,529	$ 3,377	$ 4,911

Net Income (Loss) Per Common 39

Net Income (Loss) Per Common Share Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 76,434	$ 61,533	$ 591,058	$ 207,904
Less: Dividends on participating securities	(593)	(651)	(1,803)	(1,941)
Basic net income attributable to common shareholders	75,841	60,882	589,255	205,963
Add back dividends on dilutive participating securities	593	0	1,803	0
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	751	795	6,212	2,738
Diluted net income attributable to common shareholders	$ 77,185	$ 61,677	$ 597,270	$ 208,701
Weighted average number of common shares/units outstanding, Basic	345,256	341,165	344,986	333,393
Weighted Average Limited Partnership Units Outstanding, Basic	3,504	4,380	3,609	4,384
Other potential dilutive shares/units	3,390	281	3,418	280
Weighted average number of common shares/units and potential dilutive securities	352,150	345,826	352,013	338,057
Duke Realty Limited Partnership [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 77,185	$ 62,328	$ 597,270	$ 210,642
Less: Dividends on participating securities	(593)	(651)	(1,803)	(1,941)
Basic net income attributable to common unitholders	76,592	61,677	595,467	208,701
Add back dividends on dilutive participating securities	593	0	1,803	0
Diluted net income attributable to common unitholders	$ 77,185	$ 61,677	$ 597,270	$ 208,701
Weighted average number of common shares/units outstanding, Basic	348,760	345,545	348,595	337,777
Other potential dilutive shares/units	3,390	281	3,418	280
Weighted average number of common shares/units and potential dilutive securities	352,150	345,826	352,013	338,057

Net Income (Loss) Per Common 40

Net Income (Loss) Per Common Share (Computation of Anti-Dilutive Common Shares) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	997	1,215	997	1,215
Participating Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	0	3,867	0	3,867

Segment Reporting Summary of Re

Segment Reporting Summary of Revenues (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of Reportable Segments			4
Rental and related revenue	$ 200,938	$ 202,067	$ 617,549	$ 615,493
General contractor and service fee revenue	33,599	59,739	110,320	185,072
Revenues	234,537	261,806	727,869	800,565
Disposal Group, Including Discontinued Operation, Revenue	7	29,709	32,171	89,112
Total Revenues Including Revenues Related To Discontinued Operations	234,544	291,515	760,040	889,677
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	233,063	260,781	722,027	797,213
Operating Segments [Member] | Industrial [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental and related revenue	136,276	130,495	419,391	392,048
Operating Segments [Member] | Medical Office [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental and related revenue	39,911	36,715	120,213	104,979
Operating Segments [Member] | Office [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental and related revenue	23,277	32,134	72,103	109,700
Operating Segments [Member] | All Other Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental and related revenue	0	1,698	0	5,414
Operating Segments [Member] | Service Operations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
General contractor and service fee revenue	33,599	59,739	110,320	185,072
Corporate, Non-Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental and related revenue	1,474	1,025	5,842	3,352
Disposal Group, Including Discontinued Operation, Revenue	$ 7	$ 29,709	$ 32,171	$ 89,112

Segment Reporting (Summary of N

Segment Reporting (Summary of Net Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Straight line rental income and expenses, net			$ 18,498	$ 16,419
Income (Loss) from Equity Method Investments	$ (5,088)	$ 19,178	16,281	82,325
Interest expense	(41,615)	(47,421)	(134,576)	(145,628)
Depreciation and amortization on continuing operations	(79,898)	(85,772)	(240,135)	(262,570)
Gain on sale of properties	71,259	47,143	202,153	133,617
Asset Impairment Charges	(2,426)	(6,368)	(7,896)	(8,891)
Interest and other income, net	1,343	356	3,056	936
General and administrative expenses	(11,340)	(10,573)	(47,582)	(35,632)
Gain on land sales	1,659	3,167	24,096	7,208
Other operating expenses	(1,467)	(1,829)	(4,579)	(6,032)
Gains (Losses) on Extinguishment of Debt	64	0	(82,589)	(139)
Acquisition-related activity	(5,660)	(110)	(6,993)	(871)
Income from continuing operations before income taxes	73,835	67,719	168,067	209,786
Operating Segments [Member]
Property Level Net Operating Income – Cash Basis	136,854	126,768	405,229	365,809
Property Level Net Income, Cash Basis, Continuing Operations	139,565	139,930	422,700	413,079
Operating Segments [Member] | Industrial [Member]
Property Level Net Operating Income – Cash Basis	99,236	88,654	291,987	258,863
Operating Segments [Member] | Medical Office [Member]
Property Level Net Operating Income – Cash Basis	25,827	23,456	76,878	65,820
Operating Segments [Member] | Office [Member]
Property Level Net Operating Income – Cash Basis	11,791	13,688	36,364	37,851
Operating Segments [Member] | All Other Segments [Member]
Property Level Net Operating Income – Cash Basis	0	970	0	3,275
Operating Segments [Member] | Service Operations [Member]
Service Operations Net Income (loss)	3,905	7,211	11,865	21,415
Segment Reconciling Items [Member]
Sold Properties Included in Continuing Operations Net Operating Income	2,711	13,162	17,471	47,270
Straight line rental income and expenses, net	5,723	5,466	16,830	16,183
Revenues Related to Lease Buyouts	408	145	1,366	4,365
Amortization of lease incentives and market rents	(357)	(919)	(2,559)	(4,820)
Intercompany rents and other adjusting items	(434)	(1,616)	(1,306)	(3,718)
Corporate, Non-Segment [Member]
Income (Loss) from Equity Method Investments	(5,088)	19,178	16,281	82,325
Interest expense	(41,615)	(47,421)	(134,576)	(145,628)
Depreciation and amortization on continuing operations	(79,898)	(85,772)	(240,135)	(262,570)
Gain on sale of properties	71,259	47,143	202,153	133,617
Asset Impairment Charges	(2,426)	(6,368)	(7,896)	(8,891)
Interest and other income, net	1,343	356	3,056	936
General and administrative expenses	(11,340)	(10,573)	(47,582)	(35,632)
Gain on land sales	1,659	3,167	24,096	7,208
Other operating expenses	(1,467)	(1,829)	(4,579)	(6,032)
Gains (Losses) on Extinguishment of Debt	64	0	(82,589)	(139)
Acquisition-related activity	(5,660)	(110)	(6,993)	(871)
Other non-segment income	$ (1,806)	$ (269)	$ (2,065)	$ (1,041)

Segment Reporting (Reportable S

Segment Reporting (Reportable Segments Consolidated Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Total Assets	$ 7,139,909	$ 7,754,839
Corporate, Non-Segment [Member]
Total Assets	767,307	365,030
Operating Segments [Member]
Total Assets	6,372,602	7,389,809
Operating Segments [Member] | Industrial [Member]
Total Assets	4,501,662	4,677,047
Operating Segments [Member] | Medical Office [Member]
Total Assets	1,247,196	1,229,632
Operating Segments [Member] | Office [Member]
Total Assets	483,641	1,252,627
Operating Segments [Member] | All Other Segments [Member]
Total Assets	0	71,741
Operating Segments [Member] | Service Operations [Member]
Total Assets	$ 140,103	$ 158,762

Discontinued Operations and A44

Discontinued Operations and Assets Held for Sale (Table Illustration of Number of Properties in Discontinued Operations) (Details) - buildings	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Number of properties held for sale in discontinued operations	0
Number of properties sold in discontinued operations	62	12
Total number of properties in discontinued operations	74
Continuing Operations, Number of In-service Properties Held for Sale	1
Continuing Operations, Number of Real Estate Properties Sold	78	17
Continuing Operations, Number of Real Estate Properties Sold or Classified as Held for Sale	96
Number of Real Estate Properties Held for Sale	1
Number of Real Estate Properties Sold	140	29
Total Properties Sold or Classified as Held for Sale	170
Industrial [Member]
Number of properties held for sale in discontinued operations	0
Number of properties sold in discontinued operations	5	11
Total number of properties in discontinued operations	16
Office [Member]
Number of properties held for sale in discontinued operations	0
Number of properties sold in discontinued operations	56	0
Total number of properties in discontinued operations	56
Medical Office [Member]
Number of properties held for sale in discontinued operations	0
Number of properties sold in discontinued operations	1	1
Total number of properties in discontinued operations	2

Discontinued Operations and A45

Discontinued Operations and Assets Held for Sale (Table Illustration of Discontinued Operations in Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Discontinued Operations
Revenues	$ 7	$ 29,709	$ 32,171	$ 89,112
Operating Expenses	(50)	(12,145)	(12,449)	(35,651)
Depreciation and amortization, discontinued operations	0	(9,228)	(3,517)	(28,335)
Operating Income (Loss)	(43)	8,336	16,205	25,126
Interest Expense	0	(6,059)	(5,659)	(18,557)
Income (loss) before gain on sales	(43)	2,277	10,546	6,569
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	66	564	417,795	22,864
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	23	2,841	428,341	29,433
Discontinued Operation, Tax Effect of Discontinued Operation	45	555	(3,175)	(2,969)
Income from discontinued operations	$ 68	$ 3,396	425,166	26,464
Payments For Second Generation Tenant Improvements Leasing Costs And Building Improvements			45,688	69,475
Discontinued Operations [Member]
Discontinued Operations
Payments For Second Generation Tenant Improvements Leasing Costs And Building Improvements			$ 7,400	$ 23,900

Discontinued Operations and A46

Discontinued Operations and Assets Held for Sale (Allocation of Shareholders' Income (Loss) Between Continuing and Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Discontinued Operations
Income (loss) from continuing operations attributable to common shareholders	$ 76,367	$ 58,180	$ 170,294	$ 181,783
Income (loss) from discontinued operations attributable to common shareholders	67	3,353	420,764	26,121
Net income attributable to common shareholders	$ 76,434	$ 61,533	$ 591,058	$ 207,904

Discontinued Operations and A47

Discontinued Operations and Assets Held for Sale (Aggregate Balance Sheet of Properties Held for Sale Included in Discontinued Operations) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)abuildings	Dec. 31, 2014USD ($)
Held for Sale Assets in Continuing and Discontinued Operations
Land and Land Improvements Held-for-Sale		$ 148,268
Buildings and Tenant Improvements Held-for-Sale		758,323
Inventory, Land Held-for-sale		12,443
Accumulated Depreciation of Assets Held-for-Sale		(270,340)
Lease Related Assets, Held for Sale		48,320
Other assets		28,037
Total assets held-for-sale	$ 8,920	725,051
Disposal Groups, Secured Debt Related to Assets Held for Sale		40,764
Accrued expenses		5,413
Other liabilities		12,915
Total liabilities held-for-sale	$ 225	59,092
Discontinued Operation, Number of Real Estate Properties Held for Sale | buildings	0
Continuing Operations, Number of In-service Properties Held for Sale | buildings	1
Continuing Operations [Member]
Held for Sale Assets in Continuing and Discontinued Operations
Land and Land Improvements Held-for-Sale	$ 596	21,347
Buildings and Tenant Improvements Held-for-Sale	8,039	36,925
Inventory, Land Held-for-sale	6,349	12,443
Accumulated Depreciation of Assets Held-for-Sale	(6,283)	(23,071)
Lease Related Assets, Held for Sale	67	3,480
Other assets	152	562
Total assets held-for-sale	8,920	51,686
Disposal Groups, Secured Debt Related to Assets Held for Sale	0	0
Accrued expenses	183	233
Other liabilities	42	434
Total liabilities held-for-sale	$ 225	667
Discontinued Operations [Member]
Held for Sale Assets in Continuing and Discontinued Operations
Land and Land Improvements Held-for-Sale		126,921
Buildings and Tenant Improvements Held-for-Sale		721,398
Inventory, Land Held-for-sale		0
Accumulated Depreciation of Assets Held-for-Sale		(247,269)
Lease Related Assets, Held for Sale		44,840
Other assets		27,475
Total assets held-for-sale		673,365
Disposal Groups, Secured Debt Related to Assets Held for Sale		40,764
Accrued expenses		5,180
Other liabilities		12,481
Total liabilities held-for-sale		$ 58,425
Land [Member]
Held for Sale Assets in Continuing and Discontinued Operations
Area of Land | a	39

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	May. 31, 2015	Apr. 30, 2015	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Subsequent Event [Line Items]
Repayments of Unsecured Debt	$ 7,100	$ 500,000				$ 759,948	$ 1,556
Gains (Losses) on Extinguishment of Debt				$ 64	$ 0	$ (82,589)	$ (139)
Declaration of Dividends [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Common stock dividends declared per share			$ 0.18
Record date			Nov. 16, 2015
Payment date			Nov. 30, 2015
Debt Repayment [Member]
Subsequent Event [Line Items]
Repayments of Unsecured Debt			$ 150,000
Gains (Losses) on Extinguishment of Debt			$ 3,100
Special Dividend [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Payment date			Dec. 15, 2015
Special Dividend [Member] | Declaration of Dividends [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Common stock dividends declared per share			$ 0.20