Kilroy Realty (KRC) 10-Q 30 Jul 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 24, 2015
Entity Registrant Name	KILROY REALTY CORP
Entity Central Index Key	1,025,996
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		92,207,367
Kilroy Realty, L.P. [Member]
Entity Registrant Name	Kilroy Realty, L.P.
Entity Central Index Key	1,493,976
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Amendment Flag	false

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Jun. 30, 2015		Dec. 31, 2014
REAL ESTATE ASSETS:
Land and improvements		$ 839,072		$ 877,633
Buildings and improvements		3,906,860		4,059,639
Undeveloped land and construction in progress (Note 2)		1,363,252		1,120,660
Total real estate assets held for investment		6,109,184		6,057,932
Accumulated depreciation and amortization		(960,816)		(947,664)
Total real estate assets held for investment, net ($180,488 and $211,755 of VIE, respectively, Note 1)		5,148,368		5,110,268
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 3)		81,699		8,211
CASH AND CASH EQUIVALENTS		28,142		23,781
RESTRICTED CASH (Note 1)		7,462		75,185
MARKETABLE SECURITIES (Note 12)		13,803		11,971
CURRENT RECEIVABLES, NET (Note 5)	[1]	8,956		7,229
DEFERRED RENT RECEIVABLES, NET (Note 5)		176,493	[2]	156,416
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Note 4)		174,387		201,926
DEFERRED FINANCING COSTS, NET		16,324		18,374
PREPAID EXPENSES AND OTHER ASSETS, NET		31,291		20,375
TOTAL ASSETS		5,686,925		5,633,736
LIABILITIES:
Secured debt (Notes 6 and 12)	[3]	479,368		546,292
Unsecured debt, net (Notes 6 and 12)		1,783,438		1,783,121
Unsecured line of credit (Notes 6 and 12)		100,000		140,000
Accounts payable, accrued expenses and other liabilities		199,005		225,830
Accrued distributions (Note 15)		33,670		32,899
Deferred revenue and acquisition-related intangible liabilities, net (Note 4)		123,819		132,239
Rents received in advance and tenant security deposits		47,434		49,363
Liabilities of real estate assets held for sale (Note 3)		7,086		56
Total liabilities		$ 2,773,820		$ 2,909,800
COMMITMENTS AND CONTINGENCIES (Note 11)
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Common stock, $.01 par value, 150,000,000 shares authorized, 88,405,632 and 86,259,684 shares issued and outstanding, respectively		$ 884		$ 863
Additional paid-in capital		2,791,226		2,635,900
Distributions in excess of earnings		(131,569)		(162,964)
Total stockholders’ equity		2,852,952		2,666,210
Noncontrolling interest :
Common units of the Operating Partnership (Note 7)		54,088		51,864
Noncontrolling interest in consolidated subsidiary (Note 1)		6,065		5,862
Total noncontrolling interests		60,153		57,726
Total equity		2,913,105		2,723,936
TOTAL LIABILITIES AND EQUITY		5,686,925		5,633,736
Series G Cumulative Redeemable Preferred Stock
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Cumulative Redeemable Preferred stock		96,155		96,155
Series H Cumulative Redeemable Preferred Stock
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Cumulative Redeemable Preferred stock		$ 96,256		$ 96,256
[1]	Excludes current receivables, net related to properties held for sale.
[2]	Excludes deferred rent receivables, net related to properties held for sale as of June 30, 2015.
[3]	Amounts reported include the amounts of unamortized debt premiums of $8.1 million and $10.3 million as of June 30, 2015 and December 31, 2014, respectively.

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Carrying amounts of consolidated VIE	$ 180,488,000	$ 211,755,000
Common stock, par value	$ 0.01
Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	88,405,632	86,259,684
Common stock, shares outstanding	88,405,632	86,259,684
Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	30,000,000	30,000,000
Series G Cumulative Redeemable Preferred Stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock dividend rate percentage	6.875%	6.875%
Preferred stock, shares authorized	4,600,000	4,600,000
Preferred stock, shares issued	4,000,000	4,000,000
Preferred stock, shares outstanding	4,000,000	4,000,000
Preferred Stock Liquidation preference	$ 100,000,000	$ 100,000,000
Series H Cumulative Redeemable Preferred Stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock dividend rate percentage	6.375%	6.375%
Preferred stock, shares authorized	4,000,000	4,000,000
Preferred stock, shares issued	4,000,000	4,000,000
Preferred stock, shares outstanding	4,000,000	4,000,000
Preferred Stock Liquidation preference	$ 100,000,000	$ 100,000,000

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
REVENUES:
Rental income		$ 131,450	$ 113,592	$ 262,382	$ 223,690
Tenant reimbursements		14,174	10,534	28,599	22,053
Other property income		603	3,052	1,328	5,193
Total revenues		146,227	127,178	292,309	250,936
EXPENSES
Property expenses		26,866	25,164	51,580	49,647
Real estate taxes		12,430	10,731	25,145	21,720
Provision for bad debts		47	0	289	0
Ground leases		813	773	1,589	1,535
General and administrative expenses		12,633	11,857	25,401	22,668
Acquisition-related expenses		265	609	393	837
Depreciation and amortization		51,658	50,079	103,145	98,615
Total expenses		104,712	99,213	207,542	195,022
OTHER (EXPENSES) INCOME:
Interest income and other net investment gain (Note 12)		511	419	871	596
Interest expense (Note 6)		(14,864)	(16,020)	(31,742)	(33,272)
Total other (expenses) income		(14,353)	(15,601)	(30,871)	(32,676)
INCOME FROM CONTINUING OPERATIONS BEFORE GAINS ON SALE OF REAL ESTATE		27,162	12,364	53,896	23,238
Gain on sale of land		0	3,490	17,268	3,490
Gains on sales of depreciable operating properties		31,428	0	31,428	0
INCOME FROM CONTINUING OPERATIONS		58,590	15,854	102,592	26,728
DISCONTINUED OPERATIONS (Note 1)
Income from discontinued operations		0	600	0	1,543
Gains on dispositions of discontinued operations		0	14,689	0	104,804
Total income from discontinued operations	[1]	0	15,289	0	106,347
NET INCOME		58,590	31,143	102,592	133,075
Net income attributable to noncontrolling common units of the Operating Partnership		(1,090)	(603)	(1,905)	(2,690)
NET INCOME ATTRIBUTABLE TO KILROY REALTY CORPORATION		57,500	30,540	100,687	130,385
PREFERRED DIVIDENDS		(3,312)	(3,312)	(6,625)	(6,625)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS		$ 54,188	$ 27,228	$ 94,062	$ 123,760
Income (loss) from continuing operations available to common stockholders per common share – basic (Note 13)		$ 0.61	$ 0.14	$ 1.07	$ 0.23
Income from continuing operations available to common stockholders per common share – diluted (Note 13)		0.61	0.14	1.06	0.22
Net income available to common stockholders per share – basic (Note 13)		0.61	0.33	1.07	1.49
Net income available to common stockholders per share – diluted (Note 13)		$ 0.61	$ 0.32	$ 1.06	$ 1.46
Weighted average common shares outstanding – basic (Note 13)		88,126,187	82,277,845	87,514,878	82,201,615
Weighted average common shares outstanding – diluted (Note 13)		88,645,868	84,602,332	88,044,292	84,375,255
Dividends declared per common share		$ 0.35	$ 0.35	$ 0.70	$ 0.70
[1]	The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.

Consolidated Statements of Equi

Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Total Stockholders' Equity	Preferred Stock [Member]	Common Stock Additional Paid-in Capital	Common Stock Distributions in Excess of Earnings	Noncontrolling Interest [Member]	Kilroy Realty, L.P. [Member]	Kilroy Realty, L.P. [Member]Noncontrolling Interest [Member]	Common Stock [Member]	Issuance of Equity under ATM Program [Member]Common Stock [Member]
Beginning Balance at Dec. 31, 2013	$ 2,516,160	$ 822	$ 2,461,312	$ 192,411	$ 2,478,975	$ (210,896)	$ 54,848
Beginning Balance, shares at Dec. 31, 2013		82,153,944
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	133,075		130,385			130,385	2,690	$ 133,075	$ 142
Issuance of common stock, shares (Note 8)		370,700
Issuance of common stock (Note 8)	22,136	$ 4			22,132
Issuance of share-based compensation awards	873				873
Noncash amortization of share-based compensation	6,384		6,384		6,384			6,384
Repurchase of common stock and restricted stock units, shares		(42,763)
Repurchase of common stock and restricted stock units	(2,532)		(2,532)		(2,532)
Settlement of restricted stock units for shares of common stock, shares		108,529
Settlement of restricted stock units for shares of common stock	0		0		0			0
Exercise of stock options (Note 10)		325,000
Exercise of stock options (Note 10)	13,846	$ 3	13,846		13,843
Exchange of common units of the Operating Parternship, shares		1,000
Exchange of common units of the Operating Partnership	0		28		28		(28)
Adjustment for noncontrolling interest	0		(435)		(435)		435
Preferred dividends	(6,625)		(6,625)			(6,625)		(6,625)
Dividends declared per common share and common unit ($0.70 per share/unit)	(59,977)		(58,715)			(58,715)	(1,262)
Ending Balance, shares at Jun. 30, 2014		82,916,410
Ending Balance at Jun. 30, 2014	2,623,340	$ 829	2,566,657	192,411	2,519,268	(145,851)	56,683
Beginning Balance at Dec. 31, 2014	2,723,936	$ 863	2,666,210	192,411	2,635,900	(162,964)	57,726
Beginning Balance, shares at Dec. 31, 2014		86,259,684								86,259,684
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	102,592		100,687			100,687	1,905	102,592	147
Issuance of common stock, shares (Note 8)		1,866,267									1,866,267
Issuance of common stock (Note 8)	137,924	$ 18	137,924		137,906
Issuance of share-based compensation awards, shares
Issuance of share-based compensation awards	844		844		844
Noncash amortization of share-based compensation	9,251		9,251		9,251			9,251
Repurchase of common stock and restricted stock units, shares		(20,752)
Repurchase of common stock and restricted stock units	(1,836)		(1,836)		(1,836)
Settlement of restricted stock units for shares of common stock, shares		37,403
Settlement of restricted stock units for shares of common stock	0		0		0			0
Exercise of stock options (Note 10)		252,000
Exercise of stock options (Note 10)	10,738	$ 3	10,738		10,735
Exchange of common units of the Operating Parternship, shares		11,030
Exchange of common units of the Operating Partnership	0		316		316		(316)
Adjustment for noncontrolling interest	0		(1,890)		(1,890)		1,890
Contribution by noncontrolling interest in consolidated subsidiary	203							203	$ 203
Preferred dividends	(6,625)		(6,625)			(6,625)		$ (6,625)
Dividends declared per common share and common unit ($0.70 per share/unit)	(63,922)		(62,667)			(62,667)	(1,255)
Ending Balance, shares at Jun. 30, 2015		88,405,632								88,405,632
Ending Balance at Jun. 30, 2015	$ 2,913,105	$ 884	$ 2,852,952	$ 192,411	$ 2,791,226	$ (131,569)	$ 60,153

Consolidated Statements of Equ6

Consolidated Statements of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share	$ 0.35	$ 0.35	$ 0.70	$ 0.70

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 102,592	$ 133,075
Adjustments to reconcile net income to net cash provided by operating activities (including discontinued operations):
Depreciation and amortization of building and improvements and leasing costs	101,812	98,882
Increase in provision for bad debts	289	0
Depreciation of furniture, fixtures and equipment	1,333	1,087
Noncash amortization of share-based compensation awards	7,650	5,445
Noncash amortization of deferred financing costs and debt discounts and premiums	889	2,437
Noncash amortization of net below market rents (Note 4)	(5,029)	(4,450)
Gain on sale of land (Note 3)	(17,268)	(3,490)
Gains on sales of depreciable operating properties (Note 3)	(31,428)	0
Gains on dispositions of discontinued operations (Note 1)	0	(104,804)
Noncash amortization of deferred revenue related to tenant-funded tenant improvements	(6,304)	(5,017)
Straight-line rents	(28,575)	(7,793)
Net change in other operating assets	(9,100)	(5,049)
Net change in other operating liabilities	(33)	(3,461)
Net cash provided by operating activities	116,828	106,862
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for development and redevelopment properties and undeveloped land	(199,358)	(161,802)
Expenditures for acquisition of development properties (Note 2)	(52,134)	(96,853)
Expenditures for operating properties	(50,969)	(66,923)
Expenditures for acquisition of operating properties	0	(106,125)
Net proceeds received from dispositions of land and operating properties (Note 3)	165,797	353,581
Increase in acquisition-related deposits	(6,800)	0
Decrease (increase) in restricted cash (Note 1)	58,444	(43,742)
Net cash used in investing activities	(85,020)	(121,864)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of common stock (Note 8)	137,924	22,136
Borrowings on unsecured line of credit	250,000	205,000
Repayments on unsecured line of credit	(290,000)	(160,000)
Principal payments on secured debt (Note 6)	(64,771)	(4,859)
Financing costs	(769)	(3,906)
Repurchase of common stock and restricted stock units	(1,836)	(2,532)
Proceeds from exercise of stock options (Note 10)	10,738	13,846
Contributions from noncontrolling interests in consolidated subsidiary	203	0
Dividends and distributions paid to common stockholders and common unitholders	(62,311)	(58,864)
Dividends and distributions paid to preferred stockholders and preferred unitholders	(6,625)	(6,625)
Net cash (used in) provided by financing activities	(27,447)	4,196
Net increase in cash and cash equivalents	4,361	(10,806)
Cash and cash equivalents, beginning of period	23,781	35,377
Cash and cash equivalents, end of period	28,142	24,571
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $22,753 and $20,976 as of June 30, 2015 and 2014, respectively	31,846	31,178
NONCASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	65,752	95,462
Tenant improvements funded directly by tenants	13,036	16,037
Assumption of other liabilities in connection with development acquisitions	1,478	2,300
Release of holdback funds to third party	9,279	0
NONCASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders	32,030	30,090
Accrual of dividends and distributions payable to preferred stockholders and preferred unitholders	1,656	1,656
Fair value of share-based compensation awards at equity classification date (Note 10)	20,224	17,703
Exchange of common units of the Operating Partnership into shares of the Company’s common stock	$ 316	$ 28

Consolidated Statements of Cas8

Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest - capitalized interest amount	$ 22,753	$ 20,976

Consolidated Balance Sheets (KI

Consolidated Balance Sheets (KILROY REALTY, L.P.) - USD ($) $ in Thousands		Jun. 30, 2015		Dec. 31, 2014
REAL ESTATE ASSETS:
Land and improvements		$ 839,072		$ 877,633
Buildings and improvements		3,906,860		4,059,639
Undeveloped land and construction in progress (Note 2)		1,363,252		1,120,660
Total real estate assets held for investment		6,109,184		6,057,932
Accumulated depreciation and amortization		(960,816)		(947,664)
Total real estate assets held for investment, net ($180,488 and $211,755 of VIE, respectively, Note 1)		5,148,368		5,110,268
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 3)		81,699		8,211
CASH AND CASH EQUIVALENTS		28,142		23,781
RESTRICTED CASH (Note 1)		7,462		75,185
MARKETABLE SECURITIES (Note 12)		13,803		11,971
CURRENT RECEIVABLES, NET (Note 5)	[1]	8,956		7,229
DEFERRED RENT RECEIVABLES, NET (Note 5)		176,493	[2]	156,416
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Note 4)		174,387		201,926
DEFERRED FINANCING COSTS, NET		16,324		18,374
PREPAID EXPENSES AND OTHER ASSETS, NET		31,291		20,375
TOTAL ASSETS		5,686,925		5,633,736
LIABILITIES:
Secured debt (Notes 6 and 12)	[3]	479,368		546,292
Unsecured debt, net (Notes 6 and 12)		1,783,438		1,783,121
Unsecured line of credit (Notes 6 and 12)		100,000		140,000
Accounts payable, accrued expenses and other liabilities		199,005		225,830
Accrued distributions (Note 15)		33,670		32,899
Deferred revenue and acquisition-related intangible liabilities, net (Note 4)		123,819		132,239
Rents received in advance and tenant security deposits		47,434		49,363
Liabilities of real estate assets held for sale (Note 3)		7,086		56
Total liabilities		$ 2,773,820		$ 2,909,800
COMMITMENTS AND CONTINGENCIES (Note 11)
Partners’ Capital (Note 9):
TOTAL LIABILITIES AND EQUITY		$ 5,686,925		$ 5,633,736
Kilroy Realty, L.P. [Member]
REAL ESTATE ASSETS:
Land and improvements		839,072		877,633
Buildings and improvements		3,906,860		4,059,639
Undeveloped land and construction in progress (Note 2)		1,363,252		1,120,660
Total real estate assets held for investment		6,109,184		6,057,932
Accumulated depreciation and amortization		(960,816)		(947,664)
Total real estate assets held for investment, net ($180,488 and $211,755 of VIE, respectively, Note 1)		5,148,368		5,110,268
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 3)		81,699		8,211
CASH AND CASH EQUIVALENTS		28,142		23,781
RESTRICTED CASH (Note 1)		7,462		75,185
MARKETABLE SECURITIES (Note 12)		13,803		11,971
CURRENT RECEIVABLES, NET (Note 5)		8,956		7,229
DEFERRED RENT RECEIVABLES, NET (Note 5)		176,493		156,416
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Note 4)		174,387		201,926
DEFERRED FINANCING COSTS, NET		16,324		18,374
PREPAID EXPENSES AND OTHER ASSETS, NET		31,291		20,375
TOTAL ASSETS		5,686,925		5,633,736
LIABILITIES:
Secured debt (Notes 6 and 12)		479,368		546,292
Unsecured debt, net (Notes 6 and 12)		1,783,438		1,783,121
Unsecured line of credit (Notes 6 and 12)		100,000		140,000
Accounts payable, accrued expenses and other liabilities		199,005		225,830
Accrued distributions (Note 15)		33,670		32,899
Deferred revenue and acquisition-related intangible liabilities, net (Note 4)		123,819		132,239
Rents received in advance and tenant security deposits		47,434		49,363
Liabilities of real estate assets held for sale (Note 3)		7,086		56
Total liabilities		2,773,820		2,909,800
Partners’ Capital (Note 9):
Common units, 88,405,632 and 86,259,684 held by the general partner and 1,793,170 and 1,804,200 held by common limited partners issued and outstanding, respectively		2,710,719		2,521,900
Total partners’ capital		2,903,130		2,714,311
Noncontrolling interests in consolidated subsidiaries (Note 1)		9,975		9,625
Total capital		2,913,105		2,723,936
TOTAL LIABILITIES AND EQUITY		5,686,925		5,633,736
Series G Cumulative Redeemable Preferred Unit [Member] | Kilroy Realty, L.P. [Member]
Partners’ Capital (Note 9):
Redeemable Preferred stock		96,155		96,155
Series H Cumulative Redeemable Preferred Unit [Member] | Kilroy Realty, L.P. [Member]
Partners’ Capital (Note 9):
Redeemable Preferred stock		$ 96,256		$ 96,256
[1]	Excludes current receivables, net related to properties held for sale.
[2]	Excludes deferred rent receivables, net related to properties held for sale as of June 30, 2015.
[3]	Amounts reported include the amounts of unamortized debt premiums of $8.1 million and $10.3 million as of June 30, 2015 and December 31, 2014, respectively.

Consolidated Balance Sheets (10

Consolidated Balance Sheets (KILROY REALTY, L.P.) (Parenthetical) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Carrying amounts of consolidated VIE	$ 180,488,000	$ 211,755,000
Common units held by limited partners	1,793,170	1,804,200
Common stock, par value	$ 0.01
Kilroy Realty, L.P. [Member]
Carrying amounts of consolidated VIE	$ 180,488,000	$ 211,755,000
Kilroy Realty, L.P. [Member] | Common Units [Member]
General partner, units issued	88,405,632	86,259,684
General partners, units outstanding	88,405,632	86,259,684
Limited partners, units issued	1,793,170	1,804,200
Common units held by limited partners	1,793,170	1,804,200
Kilroy Realty, L.P. [Member] | Series G Cumulative Redeemable Preferred Unit [Member]
Preferred Units, Issued	4,000,000	4,000,000
Preferred Units, Outstanding	4,000,000	4,000,000
Preferred stock dividend rate percentage	6.875%	6.875%
Preferred Stock Liquidation preference	$ 100,000,000	$ 100,000,000
Kilroy Realty, L.P. [Member] | Series H Cumulative Redeemable Preferred Unit [Member]
Preferred Units, Issued	4,000,000	4,000,000
Preferred Units, Outstanding	4,000,000	4,000,000
Preferred stock dividend rate percentage	6.375%	6.375%
Preferred Stock Liquidation preference	$ 100,000,000	$ 100,000,000

Consolidated Statements of Op11

Consolidated Statements of Operations (KILROY REALTY, L.P.) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014
REVENUES:
Rental income		$ 131,450		$ 113,592		$ 262,382	$ 223,690
Tenant reimbursements		14,174		10,534		28,599	22,053
Other property income		603		3,052		1,328	5,193
Total revenues		146,227		127,178		292,309	250,936
EXPENSES
Property expenses		26,866		25,164		51,580	49,647
Real estate taxes		12,430		10,731		25,145	21,720
Provision for bad debts		47		0		289	0
Ground leases		813		773		1,589	1,535
General and administrative expenses		12,633		11,857		25,401	22,668
Acquisition-related expenses		265		609		393	837
Depreciation and amortization		51,658		50,079		103,145	98,615
Total expenses		104,712		99,213		207,542	195,022
OTHER (EXPENSES) INCOME:
Interest income and other net investment gain (Note 12)		511		419		871	596
Interest expense (Note 6)		(14,864)		(16,020)		(31,742)	(33,272)
Total other (expenses) income		(14,353)		(15,601)		(30,871)	(32,676)
Gain on sale of land (Note 3)		0		3,490		17,268	3,490
Gain (Loss) on Disposition of Property Plant Equipment		31,428		0		31,428	0
INCOME FROM CONTINUING OPERATIONS		58,590		15,854		102,592	26,728
DISCONTINUED OPERATIONS (Note 1)
Income from discontinued operations		0		600		0	1,543
Gains on dispositions of discontinued operations		0		14,689		0	104,804
Total income from discontinued operations	[1]	0		15,289		0	106,347
NET INCOME		58,590		31,143		102,592	133,075
NET INCOME ATTRIBUTABLE TO KILROY REALTY, L.P.		57,500		30,540		100,687	130,385
NET INCOME AVAILABLE TO COMMON UNITHOLDERS		$ 54,188		$ 27,228		$ 94,062	$ 123,760
Income (loss) from continuing operations available to common unitholders per unit - basic (Note 14)		$ 0.61		$ 0.14		$ 1.07	$ 0.23
Income (loss) from continuing operations available to common unitholders per unit - diluted (Note 15)		0.61		0.14		1.06	0.22
Net income available to common unitholders per unit-basic (Note 14)		0.61		0.33		1.07	1.49
Net income available to common unitholders per unit-diluted (Note 14)		$ 0.61		$ 0.32		$ 1.06	$ 1.46
Weighted average common units outstanding - basic (Note 14)		88,126,187		82,277,845		87,514,878	82,201,615
Weighted average common units outstanding - diluted (Note 14)		88,645,868		84,602,332		88,044,292	84,375,255
Kilroy Realty, L.P. [Member]
REVENUES:
Rental income		$ 131,450		$ 113,592		$ 262,382	$ 223,690
Tenant reimbursements		14,174		10,534		28,599	22,053
Other property income		603		3,052		1,328	5,193
Total revenues		146,227		127,178		292,309	250,936
EXPENSES
Property expenses		26,866		25,164		51,580	49,647
Real estate taxes		12,430		10,731		25,145	21,720
Provision for bad debts		47		0		289	0
Ground leases		813		773		1,589	1,535
General and administrative expenses		12,633		11,857		25,401	22,668
Acquisition-related expenses		265		609		393	837
Depreciation and amortization		51,658		50,079		103,145	98,615
Total expenses		104,712		99,213		207,542	195,022
OTHER (EXPENSES) INCOME:
Interest income and other net investment gain (Note 12)		511		419		871	596
Interest expense (Note 6)		(14,864)		(16,020)		(31,742)	(33,272)
Total other (expenses) income		(14,353)		(15,601)		(30,871)	(32,676)
INCOME FROM CONTINUING OPERATIONS BEFORE GAINS ON SALE OF REAL ESTATE		27,162		12,364		53,896	23,238
Gain on sale of land (Note 3)		0		3,490		17,268	3,490
Gain (Loss) on Disposition of Property Plant Equipment		31,428		0		31,428	0
INCOME FROM CONTINUING OPERATIONS		58,590		15,854		102,592	26,728
DISCONTINUED OPERATIONS (Note 1)
Income from discontinued operations		0		600		0	1,543
Gains on dispositions of discontinued operations		0		14,689		0	104,804
Total income from discontinued operations		0	[2]	15,289	[2]	0	106,347	[2]
NET INCOME		58,590		31,143		102,592	133,075
Net income attributable to noncontrolling interests in consolidated subsidiaries		(72)		(77)		(147)	(142)
NET INCOME ATTRIBUTABLE TO KILROY REALTY, L.P.		58,518		31,066		102,445	132,933
Preferred Distributions		(3,312)		(3,312)		(6,625)	(6,625)
NET INCOME AVAILABLE TO COMMON UNITHOLDERS		$ 55,206		$ 27,754		$ 95,820	$ 126,308
Income (loss) from continuing operations available to common unitholders per unit - basic (Note 14)		$ 0.61		$ 0.14		$ 1.06	$ 0.23
Income (loss) from continuing operations available to common unitholders per unit - diluted (Note 15)		0.61		0.14		1.06	0.22
Net income available to common unitholders per unit-basic (Note 14)		0.61		0.33		1.06	1.49
Net income available to common unitholders per unit-diluted (Note 14)		$ 0.61		$ 0.32		$ 1.06	$ 1.46
Weighted average common units outstanding - basic (Note 14)		89,919,357		84,082,045		89,309,718	84,005,942
Weighted average common units outstanding - diluted (Note 14)		90,439,038		86,406,532		89,839,132	86,179,582
Dividends declared per common unit		$ 0.35		$ 0.35		$ 0.70	$ 0.70
[1]	The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.
[2]	The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.

Consolidated Statements of Capi

Consolidated Statements of Capital (KILROY REALTY, L.P.) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 58,590	$ 31,143	$ 102,592	$ 133,075
Issuance of common units (Note 9)				22,136
Issuance of share-based compensation awards				873
Noncash amortization of share-based compensation			9,251	6,384
Settlement of restricted stock units for shares of common stock			0	0
Contribution by noncontrolling interest in consolidated subsidiary			203
Preferred distributions			(6,625)	(6,625)
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,905	2,690
Kilroy Realty, L.P. [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			2,723,936	2,516,160
Net income	58,590	31,143	102,592	133,075
Issuance of common units (Note 9)			137,924
Issuance of share-based compensation awards			844
Noncash amortization of share-based compensation			9,251	6,384
Repurchase of common units and restricted stock units			(1,836)	(2,532)
Settlement of restricted stock units for shares of common stock			0	0
Exercise of stock options (Note 10)			10,738	13,846
Contribution by noncontrolling interest in consolidated subsidiary			203
Preferred distributions			(6,625)	(6,625)
Distributions declared per common unit ($0.35 per unit)			(63,922)	(59,977)
Ending Balance	2,913,105	2,623,340	2,913,105	2,623,340
Kilroy Realty, L.P. [Member] | Total Partners Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			2,714,311	2,507,772
Net income			102,445	132,933
Issuance of common units (Note 9)			137,924
Issuance of share-based compensation awards			844
Noncash amortization of share-based compensation			9,251	6,384
Repurchase of common units and restricted stock units			(1,836)	(2,532)
Settlement of restricted stock units for shares of common stock			0	0
Exercise of stock options (Note 10)			10,738	13,846
Preferred distributions			(6,625)	(6,625)
Distributions declared per common unit ($0.35 per unit)			(63,922)	(59,977)
Ending Balance	2,903,130	2,614,810	2,903,130	2,614,810
Kilroy Realty, L.P. [Member] | Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			9,625	8,388
Net income			147	142
Contribution by noncontrolling interest in consolidated subsidiary			203
Ending Balance	9,975	8,530	9,975	8,530
Kilroy Realty, L.P. [Member] | Partners Capital Preferred Units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			192,411	192,411
Ending Balance	192,411	192,411	192,411	192,411
Kilroy Realty, L.P. [Member] | Partners Capital Common Unit [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 2,521,900	$ 2,315,361
Beginning Balance units			88,063,884	83,959,144
Net income			$ 102,445	$ 132,933
Issuance of common units, units (Note 9)			1,866,267	370,700
Issuance of common units (Note 9)			$ 137,924	$ 22,136
Issuance of share-based compensation awards			844	873
Noncash amortization of share-based compensation			$ 9,251	$ 6,384
Repurchase of common units and restricted stock units, units			(20,752)	(42,763)
Repurchase of common units and restricted stock units			$ (1,836)	$ (2,532)
Settlement of restricted stock units, units			37,403	108,529
Settlement of restricted stock units for shares of common stock			$ 0	$ 0
Exercise of stock options (Note 10)			252,000	325,000
Exercise of stock options (Note 10)			$ 10,738	$ 13,846
Preferred distributions			(6,625)	(6,625)
Distributions declared per common unit ($0.35 per unit)			(63,922)	(59,977)
Ending Balance	$ 2,710,719	$ 2,422,399	$ 2,710,719	$ 2,422,399
Ending Balance units	90,198,802	84,720,610	90,198,802	84,720,610

Consolidated Statements of Ca13

Consolidated Statements of Capital (KILROY REALTY, L.P.) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Kilroy Realty, L.P. [Member]
Distributions Per Limited Partnership and General Partnership Unit, Outstanding, Basic	$ 0.35	$ 0.35	$ 0.70	$ 0.70

Consolidated Statements of Ca14

Consolidated Statements of Cash Flows (KILROY REALTY, L.P.) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 102,592	$ 133,075
Adjustments to reconcile net income to net cash provided by operating activities (including discontinued operations):
Depreciation and amortization of building and improvements and leasing costs	101,812	98,882
Increase in provision for bad debts	289	0
Depreciation of furniture, fixtures and equipment	1,333	1,087
Noncash amortization of share-based compensation awards	7,650	5,445
Noncash amortization of deferred financing costs and debt discounts and premiums	889	2,437
Noncash amortization of net below market rents (Note 4)	(5,029)	(4,450)
Gain on sale of land (Note 3)	(17,268)	(3,490)
Gains on sales of depreciable operating properties (Note 3)	31,428	0
Gains on dispositions of discontinued operations (Note 1)	0	(104,804)
Noncash amortization of deferred revenue related to tenant-funded tenant improvements	(6,304)	(5,017)
Straight-line rents	(28,575)	(7,793)
Net change in other operating assets	(9,100)	(5,049)
Net change in other operating liabilities	(33)	(3,461)
Net cash provided by operating activities	116,828	106,862
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for development and redevelopment properties and undeveloped land	(199,358)	(161,802)
Expenditures for acquisition of development properties (Note 2)	(52,134)	(96,853)
Expenditures for operating properties	(50,969)	(66,923)
Expenditures for acquisition of operating properties	0	(106,125)
Net proceeds received from dispositions of land and operating properties (Note 3)	165,797	353,581
Increase in acquisition-related deposits	(6,800)	0
Decrease (increase) in restricted cash (Note 1)	58,444	(43,742)
Net cash used in investing activities	(85,020)	(121,864)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on unsecured line of credit	250,000	205,000
Repayments on unsecured line of credit	(290,000)	(160,000)
Principal payments on secured debt (Note 6)	(64,771)	(4,859)
Financing costs	(769)	(3,906)
Repurchase of common stock and restricted stock units	(1,836)	(2,532)
Proceeds from exercise of stock options (Note 10)	10,738	13,846
Contributions from noncontrolling interests in consolidated subsidiary	203	0
Dividends and distributions paid to common unitholders	(62,311)	(58,864)
Dividends and distributions paid to preferred unitholders	(6,625)	(6,625)
Net cash provided by financing activities	(27,447)	4,196
Net increase in cash and cash equivalents	4,361	(10,806)
Cash and cash equivalents, beginning of period	23,781	35,377
Cash and cash equivalents, end of period	28,142	24,571
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $22,753 and $20,976 as of June 30, 2015 and 2014, respectively	31,846	31,178
NONCASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	65,752	95,462
Tenant improvements funded directly by tenants	13,036	16,037
Assumption of other liabilities in connection with development acquisitions	1,478	2,300
Release of Holdback Funds to Third Party	9,279	0
NONCASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common unitholders	32,030	30,090
Accrual of dividends and distributions payable to preferred unitholders	1,656	1,656
Fair value of share-based compensation awards at equity classification date (Note 10)	20,224	17,703
Kilroy Realty, L.P. [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	102,592	133,075
Adjustments to reconcile net income to net cash provided by operating activities (including discontinued operations):
Depreciation and amortization of building and improvements and leasing costs	101,812	98,882
Increase in provision for bad debts	289	0
Depreciation of furniture, fixtures and equipment	1,333	1,087
Noncash amortization of share-based compensation awards	7,650	5,445
Noncash amortization of deferred financing costs and debt discounts and premiums	889	2,437
Noncash amortization of net below market rents (Note 4)	(5,029)	(4,450)
Gain on sale of land (Note 3)	(17,268)	(3,490)
Gains on dispositions of discontinued operations (Note 1)	0	(104,804)
Noncash amortization of deferred revenue related to tenant-funded tenant improvements	(6,304)	(5,017)
Straight-line rents	(28,575)	(7,793)
Net change in other operating assets	(9,100)	(5,049)
Net change in other operating liabilities	(33)	(3,461)
Net cash provided by operating activities	116,828	106,862
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for development and redevelopment properties and undeveloped land	(199,358)	(161,802)
Expenditures for acquisition of development properties (Note 2)	(52,134)	(96,853)
Expenditures for operating properties	(50,969)	(66,923)
Expenditures for acquisition of operating properties	0	(106,125)
Net proceeds received from dispositions of land and operating properties (Note 3)	165,797	353,581
Increase in acquisition-related deposits	(6,800)	0
Decrease (increase) in restricted cash (Note 1)	58,444	(43,742)
Net cash used in investing activities	(85,020)	(121,864)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of common stock (Note 8)	137,924	22,136
Borrowings on unsecured line of credit	250,000	205,000
Repayments on unsecured line of credit	(290,000)	(160,000)
Principal payments on secured debt (Note 6)	(64,771)	(4,859)
Financing costs	(769)	(3,906)
Repurchase of common stock and restricted stock units	(1,836)	(2,532)
Proceeds from exercise of stock options (Note 10)	10,738	13,846
Contributions from noncontrolling interests in consolidated subsidiary	203	0
Dividends and distributions paid to common unitholders	(62,311)	(58,864)
Dividends and distributions paid to preferred unitholders	(6,625)	(6,625)
Net cash provided by financing activities	(27,447)	4,196
Net increase in cash and cash equivalents	4,361	(10,806)
Cash and cash equivalents, beginning of period	23,781	35,377
Cash and cash equivalents, end of period	28,142	24,571
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $22,753 and $20,976 as of June 30, 2015 and 2014, respectively	31,846	31,178
NONCASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	65,752	95,462
Tenant improvements funded directly by tenants	13,036	16,037
Assumption of other liabilities in connection with development acquisitions	1,478	2,300
NONCASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common unitholders	32,030	30,090
Accrual of dividends and distributions payable to preferred unitholders	1,656	1,656
Fair value of share-based compensation awards at equity classification date (Note 10)	$ 20,224	$ 17,703

Consolidated Statements of Ca15

Consolidated Statements of Cash Fiows (Kilroy Realty, L.P.) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash paid for interest - capitalized interest amount	$ 22,753	$ 20,976
Kilroy Realty, L.P. [Member]
Cash paid for interest - capitalized interest amount	$ 22,753	$ 20,976

Organization and Basis of Prese

Organization and Basis of Presentation	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization Kilroy Realty Corporation (the “Company”) is a self-administered real estate investment trust (“REIT”) active in premier office submarkets along the West Coast. We own, develop, acquire and manage real estate assets, consisting primarily of Class A properties in the coastal regions of Los Angeles, Orange County, San Diego County, the San Francisco Bay Area and greater Seattle, which we believe have strategic advantages and strong barriers to entry. Class A real estate encompasses attractive and efficient buildings of high quality that are attractive to tenants, are well-designed and constructed with above-average material, workmanship and finishes and are well-maintained and managed. We qualify as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”). The Company’s common stock is publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “KRC.” We own our interests in all of our real estate assets through Kilroy Realty, L.P. (the “Operating Partnership”) and Kilroy Realty Finance Partnership, L.P. (the “Finance Partnership”). We generally conduct substantially all of our operations through the Operating Partnership. Unless stated otherwise or the context indicates otherwise, the terms “Kilroy Realty Corporation” or the “Company,” “we,” “our,” and “us” refer to Kilroy Realty Corporation and its consolidated subsidiaries and the term “Operating Partnership” refers to Kilroy Realty, L.P. and its consolidated subsidiaries. The descriptions of our business, employees, and properties apply to both the Company and the Operating Partnership. Our stabilized portfolio of operating properties was comprised of the following office properties at June 30, 2015 : Number of Buildings Rentable Square Feet Number of Tenants Percentage Occupied Stabilized Office Properties 101 13,050,947 518 96.7 % Our stabilized portfolio includes all of our properties with the exception of development and redevelopment properties currently under construction or committed for construction, “lease-up” properties, real estate assets held for sale and undeveloped land. We define redevelopment properties as those properties for which we expect to spend significant development and construction costs on the existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. As of June 30, 2015 , we had no redevelopment properties. We define “lease-up” properties as properties we recently developed or redeveloped that have not yet reached 95% occupancy and are within one year following cessation of major construction activities. There were no operating properties in “lease-up” as of June 30, 2015 . As of June 30, 2015 , the following properties were excluded from our stabilized portfolio: Number of Properties/Projects Estimated Rentable Square Feet Properties held for sale (1) 6 539,823 Development projects under construction (2) 7 2,432,000 ________________________ (1) Includes six properties located in the Sorrento Mesa submarket of San Diego, California. For additional information see Note 3. (2) Estimated rentable square feet upon completion. Our stabilized portfolio also excludes our near-term and future development pipeline, which as of June 30, 2015 was comprised of nine development sites, representing approximately 103 gross acres of undeveloped land. In addition, in July 2015, we acquired an additional future development opportunity in San Francisco, which was also excluded from our stabilized portfolio at June 30, 2015 (see Note 15). As of June 30, 2015 , all of our stabilized portfolio properties and development projects were owned and all of our business was conducted in the state of California with the exception of twelve office properties and a recently acquired development opportunity located in the state of Washington. All of our properties and development projects are 100% owned, excluding a development project owned by Redwood City Partners, LLC (“Redwood LLC”), a consolidated subsidiary (see Note 1) and certain properties held at qualified intermediaries for potential future transactions that are intended to qualify as like-kind exchanges pursuant to Section 1031 of the Code (“Section 1031 Exchanges”) to defer taxable gains on dispositions for federal and state income tax purposes, which have been consolidated for financial reporting purposes. As of June 30, 2015 , the Company owned an approximate 98.0% common general partnership interest in the Operating Partnership. The remaining approximate 2.0% common limited partnership interest in the Operating Partnership as of June 30, 2015 was owned by non-affiliated investors and certain of our executive officers and directors (see Note 7). Both the general and limited common partnership interests in the Operating Partnership are denominated in common units. Generally, the number of common units held by the Company is equivalent to the number of outstanding shares of the Company’s common stock, and the rights of all the common units to quarterly distributions and payments in liquidation mirror those of the Company’s common stockholders. The common limited partners have certain redemption rights as provided in the Operating Partnership’s Seventh Amended and Restated Agreement of Limited Partnership, as amended, the “Partnership Agreement” (see Note 7). Kilroy Realty Finance, Inc., which is a wholly owned subsidiary of the Company, is the sole general partner of the Finance Partnership and owns a 1.0% common general partnership interest in the Finance Partnership. The Operating Partnership owns the remaining 99.0% common limited partnership interest. Kilroy Services, LLC (“KSLLC”), which is a wholly owned subsidiary of the Operating Partnership, is the entity through which we generally conduct substantially all of our development activities. With the exception of the Operating Partnership and Redwood LLC, all of our subsidiaries are wholly owned. Basis of Presentation The consolidated financial statements of the Company include the consolidated financial position and results of operations of the Company, the Operating Partnership, the Finance Partnership, KSLLC, Redwood LLC and all of our wholly owned and controlled subsidiaries. The consolidated financial statements of the Operating Partnership include the consolidated financial position and results of operations of the Operating Partnership, the Finance Partnership, KSLLC, Redwood LLC and all wholly-owned and controlled subsidiaries of the Operating Partnership. All intercompany balances and transactions have been eliminated in the consolidated financial statements. The accompanying interim financial statements have been prepared by management in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and in conjunction with the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures required for annual financial statements have been condensed or excluded pursuant to SEC rules and regulations. Accordingly, the interim financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the accompanying interim financial statements reflect all adjustments of a normal and recurring nature that are considered necessary for a fair presentation of the results for the interim periods presented. However, the results of operations for the interim periods are not necessarily indicative of the results that may be expected for the year ending December 31, 2015. The interim financial statements for the Company and the Operating Partnership should be read in conjunction with the audited consolidated financial statements and notes thereto included in our annual report on Form 10-K for the year ended December 31, 2014 . Certain amounts in the consolidated statements of operations for prior periods have been reclassified to reflect the activity of discontinued operations disposed of prior to the Company's adoption of Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2014-08 (“ASU 2014-08”). Properties classified as held for sale and/or disposed of prior to January 1, 2015 are presented as discontinued operations for all periods presented. Variable Interest Entities At June 30, 2015 , the consolidated financial statements of the Company and the Operating Partnership included two variable interest entities (“VIEs”), in which we were deemed to be the primary beneficiary. One VIE, Redwood LLC, was established in the second quarter of 2013 in connection with an undeveloped land acquisition. The other VIE was established during the first quarter of 2015 to facilitate potential future Section 1031 Exchanges to defer taxable gains on dispositions for federal and state income tax purposes. The impact of consolidating the VIEs increased the Company’s total assets, liabilities and noncontrolling interests by approximately $184.9 million (of which $180.5 million related to real estate held for investment on our consolidated balance sheet), approximately $13.8 million and approximately $6.1 million , respectively, as of June 30, 2015 . During July 2015, the Company successfully completed the Section 1031 Exchange and the related VIE was terminated (see Note 15). As of December 31, 2014 , the consolidated financial statements of the Company and the Operating Partnership included two VIEs, in which we were deemed to be the primary beneficiary. One of the VIEs was Redwood LLC and the remaining VIE was established during the fourth quarter of 2014 to facilitate potential Section 1031 Exchanges. During the three months ended March 31, 2015, the Section 1031 Exchange was successfully completed and the VIE was terminated. As a result, $59.2 million of our restricted cash balance at December 31, 2014 , which related to prior period disposition proceeds that were set aside to facilitate the Section 1031 Exchange, was released from escrow. The impact of consolidating the VIEs increased the Company’s total assets, liabilities and noncontrolling interests by approximately $219.6 million (of which $211.8 million related to real estate held for investment on our consolidated balance sheet), approximately $23.4 million and approximately $5.9 million , respectively, as of December 31, 2014 . Adoption of New Accounting Pronouncements Effective January 1, 2015, the Company adopted FASB ASU 2014-08, which changed the criteria for reporting discontinued operations while enhancing disclosures in this area. Under the new guidance, only disposals representing a strategic shift that has (or will have) a major effect on an entity's operations and final results, such as a major line of business, a major geographical area or a major equity investment, should be presented as discontinued operations. The Company adopted and applied the new guidance on a prospective basis as required by ASU 2014-08. Therefore, real estate assets classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift will be presented in continuing operations for all periods presented. Properties classified as held for sale and/or disposed of prior to January 1, 2015 will continue to be presented in discontinued operations for prior periods presented. In accordance with this guidance, the operations of the six properties held for sale at June 30, 2015 and the four properties sold during the six months ended June 30, 2015 are presented in continuing operations for the six months ended June 30, 2015 . For the six months ended June 30, 2014 , discontinued operations includes the income and gains on all of the properties sold in 2014. Recently Issued Accounting Pronouncements On April 7, 2015, the FASB issued ASU No. 2015-03 (“ASU 2015-03”) to amend the accounting guidance for the presentation of debt issuance costs. The standard requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 is effective for public business entities for fiscal years beginning after December 15, 2015 and retrospective application is required. Early adoption of the guidance is permitted. The Company expects to adopt the guidance effective January 1, 2016 and the guidance is not anticipated to have a material impact on our consolidated financial statements or notes to our consolidated financial statements. On April 1, 2015, the FASB voted to defer the effective date of ASU No. 2014-09, which outlines a single comprehensive model for entities to use in accounting for revenues arising from contracts with customers and notes that lease contracts with customers are a scope exception. Public business entities may elect to adopt the amendments as of the original effective date; however if the proposed deferral is approved, adoption is required for annual reporting periods beginning after December 15, 2017. The Company is currently assessing the impact of the guidance on our consolidated financial statements or notes to our consolidated financial statements. In February 2015, the FASB issued an update (“ASU 2015-02”) Amendments to the Consolidation Analysis to ASC Topic 810, Consolidation . ASU 2015-02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. Specifically, the amendments: (i) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities ("VIEs") or voting interest entities, (ii) eliminate the presumption that a general partner should consolidate a limited partnership, (iii) affect the consolidated analysis of reporting entities that are involved with VIEs, and (iv) provide a scope exception for certain entities. ASU 2015-02 is effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently assessing the impact of the guidance on our consolidated financial statements or notes to our consolidated financial statements.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Acquisitions Development Project Acquisitions During the six months ended June 30, 2015 , we acquired the development opportunity listed below from an unrelated third party. The acquisition was funded with proceeds from various sources, including the Company’s unsecured revolving credit facility, at-the-market stock offering program (see Note 8) and prior year disposition proceeds. Project Date of Acquisition Type Purchase Price (in millions) 333 Dexter (1)(2) February 13, 2015 Land $ 49.5 ________________________ (1) Acquisition comprised of four adjacent parcels in the South Lake Union submarket of Seattle, Washington located at 330 Dexter Avenue North, 333 Dexter Avenue North, 401 Dexter Avenue North, and 400 Aurora Avenue North. (2) In connection with this acquisition, we also assumed $2.4 million in accrued liabilities and acquisition costs which are not included in the purchase price above. As of June 30, 2015 , the underlying assets were included as undeveloped land and construction in progress in our consolidated balance sheets.

Real Estate Assets Held for Sal

Real Estate Assets Held for Sale and Dispositions	6 Months Ended
	Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Real Estate Assets Held for Sale and Dispositions	Real Estate Assets Held for Sale As of June 30, 2015 , the following operating properties were classified as held for sale: Location City/Submarket Property Type Number of Buildings Rentable Square Feet San Diego Properties - Tranche 2 (1) Sorrento Mesa, CA Office 6 539,823 ________________________ (1) The San Diego Properties - Tranche 2 include the following: 6260 Sequence Drive, 6290 Sequence Drive, 6310 Sequence Drive, 6340 Sequence Drive, 6350 Sequence Drive, and 4921 Directors Place. The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, the six properties held for sale at June 30, 2015 are included in continuing operations for all periods presented. The major classes of assets and liabilities of the properties held for sale as of June 30, 2015 were as follows: Real estate assets and other assets held for sale (in thousands) Land and improvements $ 19,738 Buildings and improvements 94,475 Total real estate held for sale 114,213 Accumulated depreciation and amortization (38,667 ) Total real estate held for sale, net 75,546 Current receivables, net 76 Deferred rent receivables, net 2,845 Deferred leasing costs and acquisition-related intangible assets, net 3,040 Prepaid expenses and other assets, net 192 Real estate and other assets held for sale, net $ 81,699 Liabilities and deferred revenue of real estate assets held for sale Accounts payable, accrued expenses and other liabilities $ 5,219 Deferred revenue and acquisition-related intangible liabilities, net 1,289 Rents received in advance and tenant security deposits 578 Liabilities and deferred revenue of real estate assets held for sale $ 7,086 Operating Property Dispositions The following table summarizes the operating properties sold during the six months ended June 30, 2015: Location Property Type Month of Disposition Number of Buildings Rentable Square Feet 15050 NE 36th Street, Redmond, WA Office April 1 122,103 San Diego Properties - Tranche 1 (1) Office April 3 384,468 Total Dispositions 4 506,571 ________________________ (1) The San Diego Properties - Tranche 1 include the following: 10770 Wateridge Circle, 6200 Greenwich Drive, and 6220 Greenwich Drive. The four buildings encompassing 506,571 rentable square feet were sold for a gross sales price of $146.2 million , resulting in a gain on sale of $31.4 million . Land Disposition During the six months ended June 30, 2015 , the Company sold a land parcel located at 17150 Von Karman in Irvine, California for a gross sales price of $26.0 million , resulting in a gain on sale of $17.3 million .

Deferred Leasing Costs and Acqu

Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net	6 Months Ended
	Jun. 30, 2015
Intangible Assets and Liabilities Disclosure [Abstract]
deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net	Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net The following table summarizes our deferred leasing costs and acquisition-related intangible assets (acquired value of leasing costs, above-market operating leases, in-place leases and below-market ground lease obligation) and intangible liabilities (acquired value of below-market operating leases and above-market ground lease obligation) as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in thousands) Deferred Leasing Costs and Acquisition-Related Intangible Assets, net: (1) Deferred leasing costs $ 196,967 $ 216,102 Accumulated amortization (72,992 ) (74,904 ) Deferred leasing costs, net 123,975 141,198 Above-market operating leases 14,589 20,734 Accumulated amortization (9,455 ) (13,952 ) Above-market operating leases, net 5,134 6,782 In-place leases 80,382 97,250 Accumulated amortization (35,569 ) (43,773 ) In-place leases, net 44,813 53,477 Below-market ground lease obligation 490 490 Accumulated amortization (25 ) (21 ) Below-market ground lease obligation, net 465 469 Total deferred leasing costs and acquisition-related intangible assets, net $ 174,387 $ 201,926 Acquisition-Related Intangible Liabilities, net: (1) (2) Below-market operating leases $ 59,663 $ 68,051 Accumulated amortization (28,931 ) (30,620 ) Below-market operating leases, net 30,732 37,431 Above-market ground lease obligation 6,320 6,320 Accumulated amortization (374 ) (324 ) Above-market ground lease obligation, net 5,946 5,996 Total acquisition-related intangible liabilities, net $ 36,678 $ 43,427 ________________________ (1) Excludes deferred leasing costs and acquisition-related intangible assets and liabilities related to properties held for sale at June 30, 2015 . (2) Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets. The following table sets forth amortization related to deferred leasing costs and acquisition-related intangibles, including amounts attributable to discontinued operations, for the three and six months ended June 30, 2015 and 2014 : Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in thousands) Deferred leasing costs (1) $ 7,093 $ 6,771 $ 13,914 $ 13,551 Above-market operating leases (2) 737 1,435 1,648 2,925 In-place leases (1) 4,416 5,785 8,637 11,921 Below-market ground lease obligation (3) 2 — 4 — Below-market operating leases (4) (3,838 ) (4,021 ) (6,677 ) (7,114 ) Above-market ground lease obligation (5) (25 ) (25 ) (50 ) (50 ) Total $ 8,385 $ 9,945 $ 17,476 $ 21,233 ________________________ (1) The amortization of deferred leasing costs related to lease incentives is recorded to rental income and other deferred leasing costs and in-place leases is recorded to depreciation and amortization expense in the consolidated statements of operations for the periods presented. (2) The amortization of above-market operating leases is recorded as a decrease to rental income in the consolidated statements of operations for the periods presented. (3) The amortization of the below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented. (4) The amortization of below-market operating leases is recorded as an increase to rental income in the consolidated statements of operations for the periods presented. (5) The amortization of the above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented. The following table sets forth the estimated annual amortization expense related to deferred leasing costs and acquisition-related intangibles as of June 30, 2015 for future periods: Year Deferred Leasing Costs Above-Market Operating Leases (1) In-Place Leases Below-Market Ground Lease Obligation (2) Below-Market Operating Leases (3) Above-Market Ground Lease Obligation (4) (in thousands) Remaining 2015 $ 12,781 $ 884 $ 5,872 $ 4 $ (4,273 ) $ (50 ) 2016 23,907 1,503 10,452 8 (7,638 ) (101 ) 2017 21,021 1,241 9,112 8 (7,016 ) (101 ) 2018 17,449 831 6,373 8 (5,735 ) (101 ) 2019 13,603 643 4,714 8 (3,597 ) (101 ) Thereafter 35,214 32 8,290 429 (2,473 ) (5,492 ) Total $ 123,975 $ 5,134 $ 44,813 $ 465 $ (30,732 ) $ (5,946 ) ________________________ (1) Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations. (2) Represents estimated annual amortization related to below-market ground lease obligations. Amounts will be recorded as an increase to ground lease expense in the consolidated statements of operations. (3) Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations. (4) Represents estimated annual amortization related to above-market ground lease obligations. Amounts will be recorded as a decrease to ground lease expense in the consolidated statements of operations.

Receivables

Receivables	6 Months Ended
	Jun. 30, 2015
Receivables [Abstract]
Receivables	Receivables Current Receivables, net Current receivables, net is primarily comprised of contractual rents and other lease-related obligations due from tenants. The balance consisted of the following as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in thousands) Current receivables (1) $ 10,793 $ 9,228 Allowance for uncollectible tenant receivables (1) (1,837 ) (1,999 ) Current receivables, net (1) $ 8,956 $ 7,229 ________________________ (1) Excludes current receivables, net related to properties held for sale. Deferred Rent Receivables, net Deferred rent receivables, net consisted of the following as of June 30, 2015 and December 31, 2014 : June 30, 2015 (1) December 31, 2014 (in thousands) Deferred rent receivables $ 178,609 $ 158,405 Allowance for deferred rent receivables (2,116 ) (1,989 ) Deferred rent receivables, net $ 176,493 $ 156,416 ________________________ (1) Excludes deferred rent receivables, net related to properties held for sale as of June 30, 2015 .

Secured and Unsecured Debt of t

Secured and Unsecured Debt of the Operating Partnership	6 Months Ended
	Jun. 30, 2015
Kilroy Realty, L.P. [Member]
Debt Instrument [Line Items]
Secured and Unsecured Debt of the Operating Partnership	Secured and Unsecured Debt of the Operating Partnership Secured Debt The following table sets forth the composition of our secured debt as of June 30, 2015 and December 31, 2014 : Type of Debt Annual Stated Interest Rate (1) GAAP Effective Rate (1)(2) Maturity Date June 30, 2015 (3) December 31, 2014 (3) (in thousands) Mortgage note payable 4.27% 4.27% February 2018 $ 129,555 $ 130,767 Mortgage note payable (4) 4.48% 4.48% July 2027 97,000 97,000 Mortgage note payable (4) 6.05% 3.50% June 2019 87,575 89,242 Mortgage note payable 6.51% 6.51% February 2017 66,114 66,647 Mortgage note payable (4) 5.23% 3.50% January 2016 51,883 52,793 Mortgage note payable (4) 5.57% 3.25% February 2016 39,544 40,258 Mortgage note payable (5) 5.09% 3.50% August 2015 — 34,311 Mortgage note payable (5) 4.94% 4.00% April 2015 — 26,285 Mortgage note payable 7.15% 7.15% May 2017 5,300 6,568 Other Various Various Various 2,397 2,421 Total $ 479,368 $ 546,292 ________________________ (1) All interest rates presented are fixed-rate interest rates. (2) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of discounts/premiums, excluding debt issuance costs. (3) Amounts reported include the amounts of unamortized debt premiums of $8.1 million and $10.3 million as of June 30, 2015 and December 31, 2014 , respectively. (4) The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership. (5) This mortgage note payable was repaid during the six months ended June 30, 2015 prior to maturity at par. Although our mortgage loans are secured and non-recourse to the Company and the Operating Partnership, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments and environmental liabilities. Unsecured Senior Notes The following table summarizes the balance and significant terms of the registered unsecured senior notes issued by the Operating Partnership as of June 30, 2015 and December 31, 2014 : Principal Amount as of Issuance date Maturity date Stated coupon rate Effective interest rate (1) June 30, 2015 December 31, (in thousands) 4.250% Unsecured Senior Notes (2) July 2014 August 2029 4.250% 4.350% $ 400,000 $ 400,000 Unamortized discount (4,199 ) (4,348 ) Net carrying amount $ 395,801 $ 395,652 3.800% Unsecured Senior Notes (3) January 2013 January 2023 3.800% 3.804% $ 300,000 $ 300,000 Unamortized discount (75 ) (79 ) Net carrying amount $ 299,925 $ 299,921 4.800% Unsecured Senior Notes (3) July 2011 July 2018 4.800% 4.827% $ 325,000 $ 325,000 Unamortized discount (228 ) (265 ) Net carrying amount $ 324,772 $ 324,735 6.625% Unsecured Senior Notes (4) May 2010 June 2020 6.625% 6.743% $ 250,000 $ 250,000 Unamortized discount (1,047 ) (1,154 ) Net carrying amount $ 248,953 $ 248,846 5.000% Unsecured Senior Notes (5) November 2010 November 2015 5.000% 5.014% $ 325,000 $ 325,000 Unamortized discount (13 ) (33 ) Net carrying amount $ 324,987 $ 324,967 ________________________ (1) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of initial issuance discounts, excluding debt issuance costs. (2) Interest on these notes is payable semi-annually in arrears on February 15th and August 15th of each year. (3) Interest on these notes is payable semi-annually in arrears on January 15th and July 15th of each year. (4) Interest on these notes is payable semi-annually in arrears on June 1st and December 1st of each year. (5) Interest on these notes is payable semi-annually in arrears on May 3rd and November 3rd of each year. Unsecured Revolving Credit Facility and Term Loan Facility The following table summarizes the balance and terms of our unsecured revolving credit facility as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in thousands) Outstanding borrowings $ 100,000 $ 140,000 Remaining borrowing capacity 500,000 460,000 Total borrowing capacity (1) $ 600,000 $ 600,000 Interest rate (2) 1.24 % 1.41 % Facility fee-annual rate (3) 0.200 % 0.250 % Maturity date July 2019 ________________________ (1) We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $311.0 million under an accordion feature under the terms of the unsecured revolving credit facility and term loan facility. (2) Our revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.050% and LIBOR plus 1.250% as of June 30, 2015 and December 31, 2014 , respectively. Our interest rate spread decreased as a result of an upgrade in our credit ratings during the second quarter of 2015. (3) Our facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs. As of June 30, 2015 , $5.2 million of deferred financing costs remains to be amortized through the maturity date of our unsecured revolving credit facility. The Company intends to borrow amounts under the unsecured revolving credit facility from time to time for general corporate purposes, to fund potential acquisitions, to finance development and redevelopment expenditures and to potentially repay long-term debt. The following table summarizes the balance and terms of our term loan facility as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in thousands) Outstanding borrowings $ 150,000 $ 150,000 Interest rate (1) 1.34 % 1.56 % Maturity date July 2019 ________________________ (1) Our unsecured term loan facility interest rate was calculated based on an annual rate of LIBOR plus 1.150% and LIBOR plus 1.400% as of June 30, 2015 and December 31, 2014 , respectively. Additionally, the Company has a $39.0 million unsecured term loan with an annual interest rate of LIBOR plus 1.150% and LIBOR plus 1.400% as of June 30, 2015 and December 31, 2014 , respectively, that matures in July 2019. Debt Covenants and Restrictions The unsecured revolving credit facility, the unsecured term loan facility, the unsecured term loan, the unsecured senior notes, and certain other secured debt arrangements contain covenants and restrictions requiring us to meet certain financial ratios and reporting requirements. Some of the more restrictive financial covenants include a maximum ratio of total debt to total asset value, a minimum fixed-charge coverage ratio, a minimum unsecured debt ratio and a minimum unencumbered asset pool debt service coverage ratio. Noncompliance with one or more of the covenants and restrictions could result in the full principal balance of the associated debt becoming immediately due and payable. We believe we were in compliance with all of our debt covenants as of June 30, 2015 . Debt Maturities The following table summarizes the stated debt maturities and scheduled amortization payments, excluding debt discounts and premiums, as of June 30, 2015 : Year (in thousands) Remaining 2015 $ 330,332 2016 99,431 2017 71,748 2018 451,728 2019 365,370 Thereafter 1,041,643 Total (1) $ 2,360,252 ________________________ (1) Includes gross principal balance of outstanding debt before impact of net unamortized premiums totaling approximately $2.6 million . Capitalized Interest and Loan Fees The following table sets forth gross interest expense reported in continuing operations, including debt discount/premium and loan cost amortization, net of capitalized interest, for the three and six months ended June 30, 2015 and 2014 . The interest expense capitalized was recorded as a cost of development and redevelopment, and increased the carrying value of undeveloped land and construction in progress. Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in thousands) Gross interest expense $ 27,187 $ 27,770 $ 54,936 $ 55,804 Capitalized interest and loan fees (12,323 ) (11,750 ) (23,194 ) (22,532 ) Interest expense $ 14,864 $ 16,020 $ 31,742 $ 33,272

Noncontrolling Interests on the

Noncontrolling Interests on the Company's Consolidated Financial Statements	6 Months Ended
	Jun. 30, 2015
Noncontrolling Interest [Abstract]
Noncontrolling Interests on the Company's Consolidated Financial Statements	Noncontrolling Interests on the Company’s Consolidated Financial Statements Common Units of the Operating Partnership The Company owned an approximate 98.0% , 98.0% and 97.9% common general partnership interest in the Operating Partnership as of June 30, 2015 , December 31, 2014 and June 30, 2014 , respectively. The remaining approximate 2.0% , 2.0% and 2.1% common limited partnership interest as of June 30, 2015 , December 31, 2014 and June 30, 2014 , respectively, was owned by non-affiliate investors and certain of our executive officers and directors in the form of noncontrolling common units. There were 1,793,170 , 1,804,200 and 1,804,200 common units outstanding held by these investors, executive officers and directors as of June 30, 2015 , December 31, 2014 and June 30, 2014 , respectively. The noncontrolling common units may be redeemed by unitholders for cash. Except under certain circumstances, we, at our option, may satisfy the cash redemption obligation with shares of the Company’s common stock on a one-for-one basis. If satisfied in cash, the value for each noncontrolling common unit upon redemption is the amount equal to the average of the closing quoted price per share of the Company’s common stock, par value $.01 per share, as reported on the NYSE for the ten trading days immediately preceding the applicable redemption date. The aggregate value upon redemption of the then-outstanding noncontrolling common units was $124.8 million and $126.8 million as of June 30, 2015 and December 31, 2014 , respectively. This redemption value does not necessarily represent the amount that would be distributed with respect to each noncontrolling common unit in the event of our termination or liquidation. In the event of our termination or liquidation, it is expected in most cases that each common unit would be entitled to a liquidating distribution equal to the liquidating distribution payable in respect of each share of the Company’s common stock.

Stockholders' Equity of the Com

Stockholders' Equity of the Company	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
Stockholders' Equity of the Company	Stockholders’ Equity of the Company At-The-Market Stock Offering Program Under our current at-the-market stock offering program, which commenced in December 2014, we may offer and sell shares of our common stock having an aggregate gross sales price of up to $300.0 million from time to time in “at-the-market” offerings. Since commencement of the program through June 30, 2015 , we have sold 2,007,767 shares of common stock having an aggregate gross sales price of $150.1 million . As of June 30, 2015 , shares of common stock having an aggregate gross sales price of up to $149.9 million remain available to be sold under this program. Actual future sales will depend upon a variety of factors, including but not limited to market conditions, the trading price of the Company’s common stock and our capital needs. We have no obligation to sell the remaining shares available for sale under this program. The following table sets forth information regarding sales of our common stock under our at-the-market offering program for the six months ended June 30, 2015 : Six months ended June 30, 2015 (in millions, except share and per share data) Shares of common stock sold during the period 1,866,267 Weighted average price per common share $ 75.06 Aggregate gross proceeds $ 140.1 Aggregate net proceeds after sales agent compensation $ 138.2

Partners' Capital of the Operat

Partners' Capital of the Operating Partnership	6 Months Ended
	Jun. 30, 2015
Partners' Capital Notes [Abstract]
Common Units of the Operating Partnership	Partners’ Capital of the Operating Partnership Common Units Outstanding The following table sets forth the number of common units held by the Company and the number of common units held by non-affiliate investors and certain of our executive officers and directors in the form of noncontrolling common units as well as the ownership interest held on each respective date: June 30, 2015 December 31, 2014 June 30, 2014 Company owned common units in the Operating Partnership 88,405,632 86,259,684 82,916,410 Company owned general partnership interest 98.0 % 98.0 % 97.9 % Noncontrolling common units of the Operating Partnership 1,793,170 1,804,200 1,804,200 Ownership interest of noncontrolling interest 2.0 % 2.0 % 2.1 % For a further discussion of the noncontrolling common units as of June 30, 2015 and December 31, 2014 , refer to Note 7.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation Stockholder Approved Equity Compensation Plans As of June 30, 2015 , we maintained one share-based incentive compensation plan, the Kilroy Realty 2006 Incentive Award Plan as amended (the “2006 Plan”). As of June 30, 2015 , 1,650,265 shares were available for grant under the 2006 Plan. The calculation of shares available for grant includes a reserve for a sufficient number of shares to cover the vesting and payment of performance-based vesting awards at the target levels for either performance and/or market conditions with outstanding performance periods. At our Annual Meeting of Stockholders held on May 21, 2015, stockholders approved an amendment and restatement of the 2006 Plan, which included an increase in the share limit to 8,320,000 shares. 2015 Share-Based Compensation Grants On January 27, 2015 , the Executive Compensation Committee of the Company’s Board of Directors awarded 212,468 restricted stock units (“RSUs”) to certain officers of the Company under the 2006 Plan, which included 127,657 RSUs, or 60% , that are subject to market and performance-based vesting requirements (the “2015 Performance-Based RSUs”) and 84,811 RSUs, or 40% , that are subject to time-based vesting requirements (the “2015 Time-Based RSUs”). 2015 Performance-Based RSU Grant The 2015 Performance-Based RSUs are scheduled to vest at the end of a three-year period based upon the achievement of pre-set FFO per share goals (the “performance condition”) for the year ending December 31, 2015 and also based upon the average annual relative total stockholder return targets (the “market condition”) for the three-year period ending December 31, 2017. The 2015 Performance-Based RSUs are also subject to a three-year service vesting provision and will cliff vest at the end of the three-year period. The number of 2015 Performance-Based RSUs ultimately earned, and therefore the compensation costs for these awards, could fluctuate from the 127,657 RSUs granted based upon the levels of achievement for both the FFO per share and relative stockholder return metrics. During the 2015 performance period, the estimate of the number of awards earned are evaluated quarterly based on our forecasted level of achievement of the FFO hurdle. Compensation expense for the 2015 Performance-Based RSU grant will be recorded on a straight-line basis over the three-year period. Each 2015 Performance-Based RSU represents the right to receive one share of our common stock in the future. The total fair value of the 2015 Performance-Based RSU grant was $10.1 million at January 27, 2015 and was calculated using a Monte Carlo simulation pricing model based on the assumptions in the table below. The determination of the fair value of the 2015 Performance-Based RSU grant takes into consideration the likelihood of achievement of both the performance condition and the market condition discussed above. For the six months ended June 30, 2015 , we recorded compensation expense based upon the $78.55 fair value at January 27, 2015 . The following table summarizes the assumptions utilized in the Monte Carlo simulation pricing model: Fair Value Assumptions Fair value per share at January 27, 2015 $78.55 Expected share price volatility 20.00% Risk-free interest rate 0.92% Remaining expected life 2.9 years The computation of expected volatility is based on a blend of the historical volatility of our shares of common stock over approximately six years, as that is expected to be most consistent with future volatility and equates to a time period twice as long as the approximate three-year remaining performance period of the RSUs and implied volatility data based on the observed pricing of six month publicly-traded options on our shares of common stock. The risk-free interest rate is based on the yield curve on zero-coupon U.S. Treasury STRIP securities in effect at January 27, 2015 . The expected dividend yield is estimated by examining the average of the historical dividend yield levels over the remaining 2.9 year term of the RSUs and our current annualized dividend yield as of January 27, 2015 . The expected life of the RSUs is equal to the remaining 2.9 year vesting period at January 27, 2015 . 2015 Time-Based RSU Grant The 2015 Time-Based RSUs are scheduled to vest in three equal installments beginning on January 5, 2016 through January 5, 2018. Compensation expense for the 2015 Time-Based RSUs will be recognized on a straight-line basis over the three-year service vesting period. Each 2015 Time-Based RSU represents the right to receive one share of our common stock in the future. The total fair value of the 2015 Time-Based RSU grant was $6.4 million , which was based on the $75.34 closing share price of the Company’s common stock on the NYSE on January 27, 2015 . Share-Based Award Activity During the six months ended June 30, 2015 , 252,000 non-qualified stock options were exercised and issued at an exercise price per share equal to $42.61 . As of June 30, 2015 , we had 750,000 stock options outstanding. Share-Based Compensation Cost Recorded During the Period The total compensation cost for all share-based compensation programs was $5.0 million and $3.5 million for the three months ended June 30, 2015 and 2014 , respectively, and $9.3 million and $6.4 million for the six months ended June 30, 2015 and 2014 , respectively. Of the total share-based compensation costs, $0.9 million and $0.5 million was capitalized as part of real estate assets for the three months ended June 30, 2015 and 2014 , respectively, and $1.6 million and $0.9 million was capitalized as part of real estate assets for the six months ended June 30, 2015 and 2014 , respectively. As of June 30, 2015 , there was approximately $40.3 million of total unrecognized compensation cost related to nonvested incentive awards granted under share-based compensation arrangements that is expected to be recognized over a weighted-average period of 2.3 years. The remaining compensation cost related to these nonvested incentive awards had been recognized in periods prior to June 30, 2015 .

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies General As of June 30, 2015 , we had commitments of approximately $602.3 million , excluding our ground lease commitments, for contracts and executed leases directly related to our operating and redevelopment properties. Environmental Matters We follow the policy of monitoring all of our properties, both acquisition and existing stabilized portfolio properties, for the presence of hazardous or toxic substances. While there can be no assurance that a material environmental liability does not exist, we are not currently aware of any environmental liability with respect to our stabilized portfolio properties that would have a material adverse effect on our financial condition, results of operations and cash flow, or that we believe would require additional disclosure or the recording of a loss contingency. As of June 30, 2015 , we had accrued environmental remediation liabilities of approximately $16.0 million recorded on our consolidated balance sheets in connection with certain of our recent development acquisitions and related development activities. It is possible that we could incur additional environmental remediation costs in connection with these recent development acquisitions. However, given we are in the very early stages of development, possible additional environmental costs are not reasonably estimable at this time.

Fair Value Measurements and Dis

Fair Value Measurements and Disclosures	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements and Disclosures	Fair Value Measurements and Disclosures Assets and Liabilities Reported at Fair Value The only assets we record at fair value on our consolidated financial statements are the marketable securities related to our Deferred Compensation Plan. The following table sets forth the fair value of our marketable securities as of June 30, 2015 and December 31, 2014 : Fair Value (Level 1) (1) June 30, 2015 December 31, 2014 Description (in thousands) Marketable securities (2) $ 13,803 $ 11,971 ________________________ (1) Based on quoted prices in active markets for identical securities. (2) The marketable securities are held in a limited rabbi trust. We report the change in the fair value of the marketable securities at the end of each accounting period in interest income and other net investment gain in the consolidated statements of operations. We also adjust the related Deferred Compensation Plan liability to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each participant, which results in a corresponding increase or decrease to compensation cost for the period. The following table sets forth the net gain on marketable securities recorded during the three and six months ended June 30, 2015 and 2014 : Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Description (in thousands) (in thousands) Net gain on marketable securities $ 122 $ 392 $ 510 $ 546 Financial Instruments Disclosed at Fair Value The following table sets forth the carrying value and the fair value of our other financial instruments as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 Carrying Fair Carrying Fair (in thousands) Liabilities Secured debt (1) $ 479,368 $ 492,793 $ 546,292 $ 559,483 Unsecured debt, net (2) 1,783,438 1,834,097 1,783,121 1,858,492 Unsecured line of credit (1) 100,000 100,021 140,000 145,051 ________________________ (1) Fair value calculated using Level II inputs, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets. (2) Fair value calculated using Level I and Level II inputs. Level I inputs are based on quoted prices for identical instruments in active markets. The carrying value and fair value of the Level I instruments was $1,594.4 million and $1,645.1 million , respectively, as of June 30, 2015 . The carrying value and fair value of the Level I instruments as of December 31, 2014 , was $1,269.4 million and $1,322.2 million , respectively. The carrying value and fair value of the Level II instruments was $189.0 million and $189.0 million , respectively, as of June 30, 2015 . The carrying value and fair value of the Level II instruments as of December 31, 2014 , was $513.7 million and $536.3 million , respectively.

Net Income Available to Common

Net Income Available to Common Stockholders Per Share of the Company	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Available to Common Stockholders Per Share of the Company	Net Income Available to Common Stockholders Per Share of the Company The following table reconciles the numerator and denominator in computing the Company’s basic and diluted per-share computations for net income available to common stockholders for the three and six months ended June 30, 2015 and 2014 : Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in thousands, except share and per share amounts) Numerator: Income from continuing operations $ 58,590 $ 15,854 $ 102,592 $ 26,728 Income from continuing operations attributable to noncontrolling common units of the Operating Partnership (1,090 ) (282 ) (1,905 ) (442 ) Preferred dividends (3,312 ) (3,312 ) (6,625 ) (6,625 ) Allocation to participating securities (1) (418 ) (426 ) (833 ) (853 ) Numerator for basic and diluted income from continuing operations available to common stockholders 53,770 11,834 93,229 18,808 Income from discontinued operations (2) — 15,289 — 106,347 Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership (2) — (321 ) — (2,248 ) Numerator for basic and diluted net income available to common stockholders $ 53,770 $ 26,802 $ 93,229 $ 122,907 Denominator: Basic weighted average vested shares outstanding 88,126,187 82,277,845 87,514,878 82,201,615 Effect of dilutive securities 519,681 2,324,487 529,414 2,173,640 Diluted weighted average vested shares and common share equivalents outstanding 88,645,868 84,602,332 88,044,292 84,375,255 Basic earnings per share: Income from continuing operations available to common stockholders per share $ 0.61 $ 0.14 $ 1.07 $ 0.23 Income from discontinued operations per common share (2) — 0.19 — 1.26 Net income available to common stockholders per share $ 0.61 $ 0.33 $ 1.07 $ 1.49 Diluted earnings per share: Income from continuing operations available to common stockholders per share $ 0.61 $ 0.14 $ 1.06 $ 0.22 Income from discontinued operations per common share (2) — 0.18 — 1.24 Net income available to common stockholders per share $ 0.61 $ 0.32 $ 1.06 $ 1.46 ________________________ (1) Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs. (2) The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations. Share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are considered participating securities. The impact of potentially dilutive common shares, including stock options, RSUs and other securities are considered in our diluted earnings per share calculation for the three and six months ended June 30, 2015 and 2014 , because we reported income from continuing operations attributable to common stockholders in the respective periods and the effect was dilutive. Certain market measure-based RSUs are not included in dilutive securities for the three and six months ended June 30, 2015 and 2014 as not all performance metrics had been met by the end of the applicable reporting periods. See Note 10 “Share-Based Compensation” for additional information regarding stock options and other share-based compensation.

Net Income Available to Commo29

Net Income Available to Common Unitholders Per Unit of the Operating Partnership	6 Months Ended
	Jun. 30, 2015
Earnings Per Unit [Abstract]
Net Income (Loss) Available to Common Unitholders per Unit of the Operating Partnership	Net Income Available to Common Unitholders Per Unit of the Operating Partnership The following table reconciles the numerator and denominator in computing the Operating Partnership’s basic and diluted per-unit computations for net income available to common unitholders for the three and six months ended June 30, 2015 and 2014 : Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in thousands, except unit and per unit amounts) Numerator: Income from continuing operations $ 58,590 $ 15,854 $ 102,592 $ 26,728 Income from continuing operations attributable to noncontrolling interests in consolidated subsidiaries (72 ) (64 ) (147 ) (129 ) Preferred distributions (3,312 ) (3,312 ) (6,625 ) (6,625 ) Allocation to participating securities (1) (418 ) (426 ) (833 ) (853 ) Numerator for basic and diluted income from continuing operations available to common unitholders 54,788 12,052 94,987 19,121 Income from discontinued operations (2) — 15,289 — 106,347 Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership (2) — (13 ) — (13 ) Numerator for basic and diluted net income available to common unitholders $ 54,788 $ 27,328 $ 94,987 $ 125,455 Denominator: Basic weighted average vested units outstanding 89,919,357 84,082,045 89,309,718 84,005,942 Effect of dilutive securities 519,681 2,324,487 529,414 2,173,640 Diluted weighted average vested units and common unit equivalents outstanding 90,439,038 86,406,532 89,839,132 86,179,582 Basic earnings per unit: Income from continuing operations available to common unitholders per unit $ 0.61 $ 0.14 $ 1.06 $ 0.23 Income from discontinued operations per common unit (2) — 0.19 — 1.26 Net income available to common unitholders per unit $ 0.61 $ 0.33 $ 1.06 $ 1.49 Diluted earnings per unit: Income from continuing operations available to common unitholders per unit $ 0.61 $ 0.14 $ 1.06 $ 0.22 Income from discontinued operations per common unit (2) — 0.18 — 1.24 Net income available to common unitholders per unit $ 0.61 $ 0.32 $ 1.06 $ 1.46 ________________________ (1) Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs. (2) The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations. Share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are considered participating securities. The impact of potentially dilutive common units, including stock options, RSUs and other securities are considered in our diluted earnings per share calculation for the three and six months ended June 30, 2015 and 2014 , because we reported income from continuing operations attributable to common unitholders in the respective periods and the effect was dilutive. Certain market measure-based RSUs are not included in dilutive securities for the three and six months ended June 30, 2015 and 2014 as not all performance metrics had been met by the end of the applicable reporting periods. See Note 10 “Share-Based Compensation” for additional information regarding stock options and other share-based compensation.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 1, 2015, the Company issued 3,773,766 shares of its common stock for net proceeds of $249.6 million through a registered direct placement with an institutional investor. On July 7, 2015, the Company completed the acquisition of a 3.3 acre land parcel located at 100 Hooper Street in San Francisco, California for a cash purchase price of approximately $78.0 million . On July 15, 2015, aggregate dividends, distributions and dividend equivalents of $32.0 million were paid to common stockholders and common unitholders of record on June 30, 2015 and RSU holders of record on the payment date. At June 30, 2015 , the Company had a portfolio of six properties located in San Diego, California that were classified as held for sale. The Company completed the sale of these six properties for gross proceeds of $163.0 million on July 15, 2015 (see Note 3). On July 16, 2015, $120.6 million of restricted cash was released from qualified intermediaries in connection with the successful completion of Section 1031 Exchanges. As a result of the aforementioned transactions, as of July 29, 2015, we had approximately $175.0 million of available cash balances and no outstanding borrowings on our unsecured revolving credit facility.

Organization and Basis of Pre31

Organization and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation Policy	The consolidated financial statements of the Company include the consolidated financial position and results of operations of the Company, the Operating Partnership, the Finance Partnership, KSLLC, Redwood LLC and all of our wholly owned and controlled subsidiaries. The consolidated financial statements of the Operating Partnership include the consolidated financial position and results of operations of the Operating Partnership, the Finance Partnership, KSLLC, Redwood LLC and all wholly-owned and controlled subsidiaries of the Operating Partnership. All intercompany balances and transactions have been eliminated in the consolidated financial statements.
Basis of Accounting	The accompanying interim financial statements have been prepared by management in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and in conjunction with the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures required for annual financial statements have been condensed or excluded pursuant to SEC rules and regulations. Accordingly, the interim financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the accompanying interim financial statements reflect all adjustments of a normal and recurring nature that are considered necessary for a fair presentation of the results for the interim periods presented. However, the results of operations for the interim periods are not necessarily indicative of the results that may be expected for the year ending December 31, 2015. The interim financial statements for the Company and the Operating Partnership should be read in conjunction with the audited consolidated financial statements and notes thereto included in our annual report on Form 10-K for the year ended December 31, 2014 . Certain amounts in the consolidated statements of operations for prior periods have been reclassified to reflect the activity of discontinued operations disposed of prior to the Company's adoption of Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2014-08 (“ASU 2014-08”). Properties classified as held for sale and/or disposed of prior to January 1, 2015 are presented as discontinued operations for all periods presented.
Partially Owned Entities and Variable Interest Entities	At June 30, 2015 , the consolidated financial statements of the Company and the Operating Partnership included two variable interest entities (“VIEs”), in which we were deemed to be the primary beneficiary. One VIE, Redwood LLC, was established in the second quarter of 2013 in connection with an undeveloped land acquisition. The other VIE was established during the first quarter of 2015 to facilitate potential future Section 1031 Exchanges to defer taxable gains on dispositions for federal and state income tax purposes. The impact of consolidating the VIEs increased the Company’s total assets, liabilities and noncontrolling interests by approximately $184.9 million (of which $180.5 million related to real estate held for investment on our consolidated balance sheet), approximately $13.8 million and approximately $6.1 million , respectively, as of June 30, 2015 . During July 2015, the Company successfully completed the Section 1031 Exchange and the related VIE was terminated (see Note 15). As of December 31, 2014 , the consolidated financial statements of the Company and the Operating Partnership included two VIEs, in which we were deemed to be the primary beneficiary. One of the VIEs was Redwood LLC and the remaining VIE was established during the fourth quarter of 2014 to facilitate potential Section 1031 Exchanges. During the three months ended March 31, 2015, the Section 1031 Exchange was successfully completed and the VIE was terminated. As a result, $59.2 million of our restricted cash balance at December 31, 2014 , which related to prior period disposition proceeds that were set aside to facilitate the Section 1031 Exchange, was released from escrow. The impact of consolidating the VIEs increased the Company’s total assets, liabilities and noncontrolling interests by approximately $219.6 million (of which $211.8 million related to real estate held for investment on our consolidated balance sheet), approximately $23.4 million and approximately $5.9 million , respectively, as of December 31, 2014 .
Recent Accounting Pronouncements	Recently Issued Accounting Pronouncements On April 7, 2015, the FASB issued ASU No. 2015-03 (“ASU 2015-03”) to amend the accounting guidance for the presentation of debt issuance costs. The standard requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 is effective for public business entities for fiscal years beginning after December 15, 2015 and retrospective application is required. Early adoption of the guidance is permitted. The Company expects to adopt the guidance effective January 1, 2016 and the guidance is not anticipated to have a material impact on our consolidated financial statements or notes to our consolidated financial statements. On April 1, 2015, the FASB voted to defer the effective date of ASU No. 2014-09, which outlines a single comprehensive model for entities to use in accounting for revenues arising from contracts with customers and notes that lease contracts with customers are a scope exception. Public business entities may elect to adopt the amendments as of the original effective date; however if the proposed deferral is approved, adoption is required for annual reporting periods beginning after December 15, 2017. The Company is currently assessing the impact of the guidance on our consolidated financial statements or notes to our consolidated financial statements. In February 2015, the FASB issued an update (“ASU 2015-02”) Amendments to the Consolidation Analysis to ASC Topic 810, Consolidation . ASU 2015-02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. Specifically, the amendments: (i) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities ("VIEs") or voting interest entities, (ii) eliminate the presumption that a general partner should consolidate a limited partnership, (iii) affect the consolidated analysis of reporting entities that are involved with VIEs, and (iv) provide a scope exception for certain entities. ASU 2015-02 is effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently assessing the impact of the guidance on our consolidated financial statements or notes to our consolidated financial statements.

Organization and Basis of Pre32

Organization and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2015
Real Estate Properties [Line Items]
Summary of real estate properties	As of June 30, 2015 , the following properties were excluded from our stabilized portfolio: Number of Properties/Projects Estimated Rentable Square Feet Properties held for sale (1) 6 539,823 Development projects under construction (2) 7 2,432,000 ________________________ (1) Includes six properties located in the Sorrento Mesa submarket of San Diego, California. For additional information see Note 3. (2) Estimated rentable square feet upon completion. Our stabilized portfolio of operating properties was comprised of the following office properties at June 30, 2015 : Number of Buildings Rentable Square Feet Number of Tenants Percentage Occupied Stabilized Office Properties 101 13,050,947 518 96.7 %

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Schedule of Significant Acquisitions	Development Project Acquisitions During the six months ended June 30, 2015 , we acquired the development opportunity listed below from an unrelated third party. The acquisition was funded with proceeds from various sources, including the Company’s unsecured revolving credit facility, at-the-market stock offering program (see Note 8) and prior year disposition proceeds. Project Date of Acquisition Type Purchase Price (in millions) 333 Dexter (1)(2) February 13, 2015 Land $ 49.5 ________________________ (1) Acquisition comprised of four adjacent parcels in the South Lake Union submarket of Seattle, Washington located at 330 Dexter Avenue North, 333 Dexter Avenue North, 401 Dexter Avenue North, and 400 Aurora Avenue North. (2) In connection with this acquisition, we also assumed $2.4 million in accrued liabilities and acquisition costs which are not included in the purchase price above. As of June 30, 2015 , the underlying assets were included as undeveloped land and construction in progress in our consolidated balance sheets.

Real Estate Assets Held for S34

Real Estate Assets Held for Sale and Dispositions (Tables)	6 Months Ended
	Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Disclosure of Long Lived Assets Held-for-sale [Table Text Block]	The major classes of assets and liabilities of the properties held for sale as of June 30, 2015 were as follows: Real estate assets and other assets held for sale (in thousands) Land and improvements $ 19,738 Buildings and improvements 94,475 Total real estate held for sale 114,213 Accumulated depreciation and amortization (38,667 ) Total real estate held for sale, net 75,546 Current receivables, net 76 Deferred rent receivables, net 2,845 Deferred leasing costs and acquisition-related intangible assets, net 3,040 Prepaid expenses and other assets, net 192 Real estate and other assets held for sale, net $ 81,699 Liabilities and deferred revenue of real estate assets held for sale Accounts payable, accrued expenses and other liabilities $ 5,219 Deferred revenue and acquisition-related intangible liabilities, net 1,289 Rents received in advance and tenant security deposits 578 Liabilities and deferred revenue of real estate assets held for sale $ 7,086 As of June 30, 2015 , the following operating properties were classified as held for sale: Location City/Submarket Property Type Number of Buildings Rentable Square Feet San Diego Properties - Tranche 2 (1) Sorrento Mesa, CA Office 6 539,823

Deferred Leasing Costs and Ac35

Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net (Tables)	6 Months Ended
	Jun. 30, 2015
Intangible Assets and Liabilities Disclosure [Abstract]
Summary of identified deferred leasing costs and acquisition-related intangible assets and liabilities	The following table summarizes our deferred leasing costs and acquisition-related intangible assets (acquired value of leasing costs, above-market operating leases, in-place leases and below-market ground lease obligation) and intangible liabilities (acquired value of below-market operating leases and above-market ground lease obligation) as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in thousands) Deferred Leasing Costs and Acquisition-Related Intangible Assets, net: (1) Deferred leasing costs $ 196,967 $ 216,102 Accumulated amortization (72,992 ) (74,904 ) Deferred leasing costs, net 123,975 141,198 Above-market operating leases 14,589 20,734 Accumulated amortization (9,455 ) (13,952 ) Above-market operating leases, net 5,134 6,782 In-place leases 80,382 97,250 Accumulated amortization (35,569 ) (43,773 ) In-place leases, net 44,813 53,477 Below-market ground lease obligation 490 490 Accumulated amortization (25 ) (21 ) Below-market ground lease obligation, net 465 469 Total deferred leasing costs and acquisition-related intangible assets, net $ 174,387 $ 201,926 Acquisition-Related Intangible Liabilities, net: (1) (2) Below-market operating leases $ 59,663 $ 68,051 Accumulated amortization (28,931 ) (30,620 ) Below-market operating leases, net 30,732 37,431 Above-market ground lease obligation 6,320 6,320 Accumulated amortization (374 ) (324 ) Above-market ground lease obligation, net 5,946 5,996 Total acquisition-related intangible liabilities, net $ 36,678 $ 43,427 ________________________ (1) Excludes deferred leasing costs and acquisition-related intangible assets and liabilities related to properties held for sale at June 30, 2015 . (2) Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets.
Schedule Of Finite Lived Intangible Assets and Liabilities Amortization Expense	The following table sets forth amortization related to deferred leasing costs and acquisition-related intangibles, including amounts attributable to discontinued operations, for the three and six months ended June 30, 2015 and 2014 : Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in thousands) Deferred leasing costs (1) $ 7,093 $ 6,771 $ 13,914 $ 13,551 Above-market operating leases (2) 737 1,435 1,648 2,925 In-place leases (1) 4,416 5,785 8,637 11,921 Below-market ground lease obligation (3) 2 — 4 — Below-market operating leases (4) (3,838 ) (4,021 ) (6,677 ) (7,114 ) Above-market ground lease obligation (5) (25 ) (25 ) (50 ) (50 ) Total $ 8,385 $ 9,945 $ 17,476 $ 21,233 ________________________ (1) The amortization of deferred leasing costs related to lease incentives is recorded to rental income and other deferred leasing costs and in-place leases is recorded to depreciation and amortization expense in the consolidated statements of operations for the periods presented. (2) The amortization of above-market operating leases is recorded as a decrease to rental income in the consolidated statements of operations for the periods presented. (3) The amortization of the below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented. (4) The amortization of below-market operating leases is recorded as an increase to rental income in the consolidated statements of operations for the periods presented. (5) The amortization of the above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented.
Schedule of Finite Lived Intangible Assets And Liabilities Future Amortization Expense	The following table sets forth the estimated annual amortization expense related to deferred leasing costs and acquisition-related intangibles as of June 30, 2015 for future periods: Year Deferred Leasing Costs Above-Market Operating Leases (1) In-Place Leases Below-Market Ground Lease Obligation (2) Below-Market Operating Leases (3) Above-Market Ground Lease Obligation (4) (in thousands) Remaining 2015 $ 12,781 $ 884 $ 5,872 $ 4 $ (4,273 ) $ (50 ) 2016 23,907 1,503 10,452 8 (7,638 ) (101 ) 2017 21,021 1,241 9,112 8 (7,016 ) (101 ) 2018 17,449 831 6,373 8 (5,735 ) (101 ) 2019 13,603 643 4,714 8 (3,597 ) (101 ) Thereafter 35,214 32 8,290 429 (2,473 ) (5,492 ) Total $ 123,975 $ 5,134 $ 44,813 $ 465 $ (30,732 ) $ (5,946 ) ________________________ (1) Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations. (2) Represents estimated annual amortization related to below-market ground lease obligations. Amounts will be recorded as an increase to ground lease expense in the consolidated statements of operations. (3) Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations. (4) Represents estimated annual amortization related to above-market ground lease obligations. Amounts will be recorded as a decrease to ground lease expense in the consolidated statements of operations.

Receivables (Tables)

Receivables (Tables)	6 Months Ended
	Jun. 30, 2015
Receivables [Abstract]
Current Receivables, net	Current receivables, net is primarily comprised of contractual rents and other lease-related obligations due from tenants. The balance consisted of the following as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in thousands) Current receivables (1) $ 10,793 $ 9,228 Allowance for uncollectible tenant receivables (1) (1,837 ) (1,999 ) Current receivables, net (1) $ 8,956 $ 7,229
Deferred Rent Receivables, net	Deferred rent receivables, net consisted of the following as of June 30, 2015 and December 31, 2014 : June 30, 2015 (1) December 31, 2014 (in thousands) Deferred rent receivables $ 178,609 $ 158,405 Allowance for deferred rent receivables (2,116 ) (1,989 ) Deferred rent receivables, net $ 176,493 $ 156,416 ________________________ (1) Excludes deferred rent receivables, net related to properties held for sale as of June 30, 2015 .

Secured and Unsecured Debt of37

Secured and Unsecured Debt of the Operating Partnership (Tables) - Kilroy Realty, L.P. [Member]	6 Months Ended
	Jun. 30, 2015
Debt Instrument [Line Items]
Schedule of Term Loan Facilities [Table Text Block]	The following table summarizes the balance and terms of our term loan facility as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in thousands) Outstanding borrowings $ 150,000 $ 150,000 Interest rate (1) 1.34 % 1.56 % Maturity date July 2019
Unsecured Revolving Credit Facility	The following table summarizes the balance and terms of our unsecured revolving credit facility as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in thousands) Outstanding borrowings $ 100,000 $ 140,000 Remaining borrowing capacity 500,000 460,000 Total borrowing capacity (1) $ 600,000 $ 600,000 Interest rate (2) 1.24 % 1.41 % Facility fee-annual rate (3) 0.200 % 0.250 % Maturity date July 2019 ________________________ (1) We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $311.0 million under an accordion feature under the terms of the unsecured revolving credit facility and term loan facility. (2) Our revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.050% and LIBOR plus 1.250% as of June 30, 2015 and December 31, 2014 , respectively. Our interest rate spread decreased as a result of an upgrade in our credit ratings during the second quarter of 2015. (3) Our facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs. As of June 30, 2015 , $5.2 million of deferred financing costs remains to be amortized through the maturity date of our unsecured revolving credit facility.
Stated debt maturities and scheduled amortization payments, excluding debt discounts	The following table summarizes the stated debt maturities and scheduled amortization payments, excluding debt discounts and premiums, as of June 30, 2015 : Year (in thousands) Remaining 2015 $ 330,332 2016 99,431 2017 71,748 2018 451,728 2019 365,370 Thereafter 1,041,643 Total (1) $ 2,360,252 ________________________ (1) Includes gross principal balance of outstanding debt before impact of net unamortized premiums totaling approximately $2.6 million
Capitalized interest and loan fees	The following table sets forth gross interest expense reported in continuing operations, including debt discount/premium and loan cost amortization, net of capitalized interest, for the three and six months ended June 30, 2015 and 2014 . The interest expense capitalized was recorded as a cost of development and redevelopment, and increased the carrying value of undeveloped land and construction in progress. Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in thousands) Gross interest expense $ 27,187 $ 27,770 $ 54,936 $ 55,804 Capitalized interest and loan fees (12,323 ) (11,750 ) (23,194 ) (22,532 ) Interest expense $ 14,864 $ 16,020 $ 31,742 $ 33,272
Secured Debt [Member]
Debt Instrument [Line Items]
Balance and significant terms of debt	The following table sets forth the composition of our secured debt as of June 30, 2015 and December 31, 2014 : Type of Debt Annual Stated Interest Rate (1) GAAP Effective Rate (1)(2) Maturity Date June 30, 2015 (3) December 31, 2014 (3) (in thousands) Mortgage note payable 4.27% 4.27% February 2018 $ 129,555 $ 130,767 Mortgage note payable (4) 4.48% 4.48% July 2027 97,000 97,000 Mortgage note payable (4) 6.05% 3.50% June 2019 87,575 89,242 Mortgage note payable 6.51% 6.51% February 2017 66,114 66,647 Mortgage note payable (4) 5.23% 3.50% January 2016 51,883 52,793 Mortgage note payable (4) 5.57% 3.25% February 2016 39,544 40,258 Mortgage note payable (5) 5.09% 3.50% August 2015 — 34,311 Mortgage note payable (5) 4.94% 4.00% April 2015 — 26,285 Mortgage note payable 7.15% 7.15% May 2017 5,300 6,568 Other Various Various Various 2,397 2,421 Total $ 479,368 $ 546,292 ________________________ (1) All interest rates presented are fixed-rate interest rates. (2) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of discounts/premiums, excluding debt issuance costs. (3) Amounts reported include the amounts of unamortized debt premiums of $8.1 million and $10.3 million as of June 30, 2015 and December 31, 2014 , respectively. (4) The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.
Senior Notes [Member]
Debt Instrument [Line Items]
Balance and significant terms of debt	The following table summarizes the balance and significant terms of the registered unsecured senior notes issued by the Operating Partnership as of June 30, 2015 and December 31, 2014 : Principal Amount as of Issuance date Maturity date Stated coupon rate Effective interest rate (1) June 30, 2015 December 31, (in thousands) 4.250% Unsecured Senior Notes (2) July 2014 August 2029 4.250% 4.350% $ 400,000 $ 400,000 Unamortized discount (4,199 ) (4,348 ) Net carrying amount $ 395,801 $ 395,652 3.800% Unsecured Senior Notes (3) January 2013 January 2023 3.800% 3.804% $ 300,000 $ 300,000 Unamortized discount (75 ) (79 ) Net carrying amount $ 299,925 $ 299,921 4.800% Unsecured Senior Notes (3) July 2011 July 2018 4.800% 4.827% $ 325,000 $ 325,000 Unamortized discount (228 ) (265 ) Net carrying amount $ 324,772 $ 324,735 6.625% Unsecured Senior Notes (4) May 2010 June 2020 6.625% 6.743% $ 250,000 $ 250,000 Unamortized discount (1,047 ) (1,154 ) Net carrying amount $ 248,953 $ 248,846 5.000% Unsecured Senior Notes (5) November 2010 November 2015 5.000% 5.014% $ 325,000 $ 325,000 Unamortized discount (13 ) (33 ) Net carrying amount $ 324,987 $ 324,967 ________________________ (1) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of initial issuance discounts, excluding debt issuance costs. (2) Interest on these notes is payable semi-annually in arrears on February 15th and August 15th of each year. (3) Interest on these notes is payable semi-annually in arrears on January 15th and July 15th of each year. (4) Interest on these notes is payable semi-annually in arrears on June 1st and December 1st of each year. (5) Interest on these notes is payable semi-annually in arrears on May 3rd and November 3rd of each year.

Stockholders' Equity of the C38

Stockholders' Equity of the Company (Tables)	6 Months Ended
	Jun. 30, 2015
Class of Stock [Line Items]
Schedule of Stockholders Equity [Table Text Block]	The following table sets forth information regarding sales of our common stock under our at-the-market offering program for the six months ended June 30, 2015 : Six months ended June 30, 2015 (in millions, except share and per share data) Shares of common stock sold during the period 1,866,267 Weighted average price per common share $ 75.06 Aggregate gross proceeds $ 140.1 Aggregate net proceeds after sales agent compensation $ 138.2

Partners' Capital of the Oper39

Partners' Capital of the Operating Partnership Ownership Interest (Tables)	6 Months Ended
	Jun. 30, 2015
Noncontrolling Interest [Abstract]
Redeemable Noncontrolling Interest	The following table sets forth the number of common units held by the Company and the number of common units held by non-affiliate investors and certain of our executive officers and directors in the form of noncontrolling common units as well as the ownership interest held on each respective date: June 30, 2015 December 31, 2014 June 30, 2014 Company owned common units in the Operating Partnership 88,405,632 86,259,684 82,916,410 Company owned general partnership interest 98.0 % 98.0 % 97.9 % Noncontrolling common units of the Operating Partnership 1,793,170 1,804,200 1,804,200 Ownership interest of noncontrolling interest 2.0 % 2.0 % 2.1 %

Share-Based Compensation Share-

Share-Based Compensation Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions	The following table summarizes the assumptions utilized in the Monte Carlo simulation pricing model: Fair Value Assumptions Fair value per share at January 27, 2015 $78.55 Expected share price volatility 20.00% Risk-free interest rate 0.92% Remaining expected life 2.9 years

Fair Value Measurements and D41

Fair Value Measurements and Disclosures (Tables)	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Fair value of the company's marketable securities	The following table sets forth the fair value of our marketable securities as of June 30, 2015 and December 31, 2014 : Fair Value (Level 1) (1) June 30, 2015 December 31, 2014 Description (in thousands) Marketable securities (2) $ 13,803 $ 11,971 ________________________ (1) Based on quoted prices in active markets for identical securities. (2) The marketable securities are held in a limited rabbi trust.
Fair value adjustment of marketable securities and deferred compensation plan liability	The following table sets forth the net gain on marketable securities recorded during the three and six months ended June 30, 2015 and 2014 : Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Description (in thousands) (in thousands) Net gain on marketable securities $ 122 $ 392 $ 510 $ 546
Carrying value and fair value of company's remaining financial assets and liabilities	The following table sets forth the carrying value and the fair value of our other financial instruments as of June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 Carrying Fair Carrying Fair (in thousands) Liabilities Secured debt (1) $ 479,368 $ 492,793 $ 546,292 $ 559,483 Unsecured debt, net (2) 1,783,438 1,834,097 1,783,121 1,858,492 Unsecured line of credit (1) 100,000 100,021 140,000 145,051 ________________________ (1) Fair value calculated using Level II inputs, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets. (2) Fair value calculated using Level I and Level II inputs. Level I inputs are based on quoted prices for identical instruments in active markets. The carrying value and fair value of the Level I instruments was $1,594.4 million and $1,645.1 million , respectively, as of June 30, 2015 . The carrying value and fair value of the Level I instruments as of December 31, 2014 , was $1,269.4 million and $1,322.2 million , respectively. The carrying value and fair value of the Level II instruments was $189.0 million and $189.0 million , respectively, as of June 30, 2015 . The carrying value and fair value of the Level II instruments as of December 31, 2014 , was $513.7 million and $536.3 million , respectively.

Net Income Available to Commo42

Net Income Available to Common Stockholders Per Share of the Company (Tables)	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income (loss) available to common stockholders	The following table reconciles the numerator and denominator in computing the Company’s basic and diluted per-share computations for net income available to common stockholders for the three and six months ended June 30, 2015 and 2014 : Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in thousands, except share and per share amounts) Numerator: Income from continuing operations $ 58,590 $ 15,854 $ 102,592 $ 26,728 Income from continuing operations attributable to noncontrolling common units of the Operating Partnership (1,090 ) (282 ) (1,905 ) (442 ) Preferred dividends (3,312 ) (3,312 ) (6,625 ) (6,625 ) Allocation to participating securities (1) (418 ) (426 ) (833 ) (853 ) Numerator for basic and diluted income from continuing operations available to common stockholders 53,770 11,834 93,229 18,808 Income from discontinued operations (2) — 15,289 — 106,347 Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership (2) — (321 ) — (2,248 ) Numerator for basic and diluted net income available to common stockholders $ 53,770 $ 26,802 $ 93,229 $ 122,907 Denominator: Basic weighted average vested shares outstanding 88,126,187 82,277,845 87,514,878 82,201,615 Effect of dilutive securities 519,681 2,324,487 529,414 2,173,640 Diluted weighted average vested shares and common share equivalents outstanding 88,645,868 84,602,332 88,044,292 84,375,255 Basic earnings per share: Income from continuing operations available to common stockholders per share $ 0.61 $ 0.14 $ 1.07 $ 0.23 Income from discontinued operations per common share (2) — 0.19 — 1.26 Net income available to common stockholders per share $ 0.61 $ 0.33 $ 1.07 $ 1.49 Diluted earnings per share: Income from continuing operations available to common stockholders per share $ 0.61 $ 0.14 $ 1.06 $ 0.22 Income from discontinued operations per common share (2) — 0.18 — 1.24 Net income available to common stockholders per share $ 0.61 $ 0.32 $ 1.06 $ 1.46 ________________________ (1) Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs. (2) The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.

Net Income Available to Commo43

Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Tables)	6 Months Ended
	Jun. 30, 2015
Net Income Available To Common Unitholders [Line Items]
Net income (loss) available to common unitholders	The following table reconciles the numerator and denominator in computing the Company’s basic and diluted per-share computations for net income available to common stockholders for the three and six months ended June 30, 2015 and 2014 : Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in thousands, except share and per share amounts) Numerator: Income from continuing operations $ 58,590 $ 15,854 $ 102,592 $ 26,728 Income from continuing operations attributable to noncontrolling common units of the Operating Partnership (1,090 ) (282 ) (1,905 ) (442 ) Preferred dividends (3,312 ) (3,312 ) (6,625 ) (6,625 ) Allocation to participating securities (1) (418 ) (426 ) (833 ) (853 ) Numerator for basic and diluted income from continuing operations available to common stockholders 53,770 11,834 93,229 18,808 Income from discontinued operations (2) — 15,289 — 106,347 Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership (2) — (321 ) — (2,248 ) Numerator for basic and diluted net income available to common stockholders $ 53,770 $ 26,802 $ 93,229 $ 122,907 Denominator: Basic weighted average vested shares outstanding 88,126,187 82,277,845 87,514,878 82,201,615 Effect of dilutive securities 519,681 2,324,487 529,414 2,173,640 Diluted weighted average vested shares and common share equivalents outstanding 88,645,868 84,602,332 88,044,292 84,375,255 Basic earnings per share: Income from continuing operations available to common stockholders per share $ 0.61 $ 0.14 $ 1.07 $ 0.23 Income from discontinued operations per common share (2) — 0.19 — 1.26 Net income available to common stockholders per share $ 0.61 $ 0.33 $ 1.07 $ 1.49 Diluted earnings per share: Income from continuing operations available to common stockholders per share $ 0.61 $ 0.14 $ 1.06 $ 0.22 Income from discontinued operations per common share (2) — 0.18 — 1.24 Net income available to common stockholders per share $ 0.61 $ 0.32 $ 1.06 $ 1.46 ________________________ (1) Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs. (2) The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.
Kilroy Realty, L.P. [Member]
Net Income Available To Common Unitholders [Line Items]
Net income (loss) available to common unitholders	The following table reconciles the numerator and denominator in computing the Operating Partnership’s basic and diluted per-unit computations for net income available to common unitholders for the three and six months ended June 30, 2015 and 2014 : Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in thousands, except unit and per unit amounts) Numerator: Income from continuing operations $ 58,590 $ 15,854 $ 102,592 $ 26,728 Income from continuing operations attributable to noncontrolling interests in consolidated subsidiaries (72 ) (64 ) (147 ) (129 ) Preferred distributions (3,312 ) (3,312 ) (6,625 ) (6,625 ) Allocation to participating securities (1) (418 ) (426 ) (833 ) (853 ) Numerator for basic and diluted income from continuing operations available to common unitholders 54,788 12,052 94,987 19,121 Income from discontinued operations (2) — 15,289 — 106,347 Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership (2) — (13 ) — (13 ) Numerator for basic and diluted net income available to common unitholders $ 54,788 $ 27,328 $ 94,987 $ 125,455 Denominator: Basic weighted average vested units outstanding 89,919,357 84,082,045 89,309,718 84,005,942 Effect of dilutive securities 519,681 2,324,487 529,414 2,173,640 Diluted weighted average vested units and common unit equivalents outstanding 90,439,038 86,406,532 89,839,132 86,179,582 Basic earnings per unit: Income from continuing operations available to common unitholders per unit $ 0.61 $ 0.14 $ 1.06 $ 0.23 Income from discontinued operations per common unit (2) — 0.19 — 1.26 Net income available to common unitholders per unit $ 0.61 $ 0.33 $ 1.06 $ 1.49 Diluted earnings per unit: Income from continuing operations available to common unitholders per unit $ 0.61 $ 0.14 $ 1.06 $ 0.22 Income from discontinued operations per common unit (2) — 0.18 — 1.24 Net income available to common unitholders per unit $ 0.61 $ 0.32 $ 1.06 $ 1.46 ________________________ (1) Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs.

Organization and Basis of Pre44

Organization and Basis of Presentation (Details) - Jun. 30, 2015		ft²projecttenantbuildingproperty
Real Estate Properties [Line Items]
Number of buildings | building		4
Rentable square feet		506,571
Kilroy Realty Finance, Inc. [Member]
Real Estate Properties [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest		1.00%
Development Properties [Member]
Real Estate Properties [Line Items]
Number of buildings | project	[1]	7
Rentable square feet	[1]	2,432,000
Office Properties [Member]
Real Estate Properties [Line Items]
Number of buildings | building		101
Rentable square feet		13,050,947
Number of Tenants | tenant		518
Percentage Occupied		96.70%
WASHINGTON
Real Estate Properties [Line Items]
Number of buildings | property		12
San Diego Portfolio [Member]
Real Estate Properties [Line Items]
Number of buildings | building	[2]	6
Rentable square feet	[3]	539,823
[1]	Estimated rentable square feet upon completion.
[2]	(1)The San Diego Properties - Tranche 2 include the following: 6260 Sequence Drive, 6290 Sequence Drive, 6310 Sequence Drive, 6340 Sequence Drive, 6350 Sequence Drive, and 4921 Directors Place.
[3]	Includes six properties located in the Sorrento Mesa submarket of San Diego, California. For additional information see Note 3.

Organization and Basis of Pre45

Organization and Basis of Presentation (Details Textuals) $ in Thousands		3 Months Ended	6 Months Ended
		Dec. 31, 2014USD ($)	Jun. 30, 2015USD ($)abuildingproperty	Jun. 30, 2014USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Lease-Up Properties, Maximum Stabilized Occupacy, Percentage			95.00%
Number of buildings | building			4
Percentage of general partnership interest owned by the company in the Operating Partnership		98.00%	98.00%	97.90%
Percentage of Common limited partnership interest owned by certain non-affiliated investors and certain directors and officers of the Company in the Operating Partnership		2.00%	2.00%	2.10%
Variable Interest Entity, Consolidated, Carrying Amount, Assets		$ 219,600	$ 184,900
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities		23,400	13,800
Noncontrolling Interest in Variable Interest Entity		5,862	6,065
Proceeds from Sale of Real Estate Held-for-investment			$ 165,797	$ 353,581
WASHINGTON
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings | property			12
Kilroy Realty, L.P. [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of limited partnership interest owned by Operating Partnership			99.00%
Proceeds from Sale of Real Estate Held-for-investment			$ 165,797	$ 353,581
Kilroy Realty Finance, Inc. [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest			1.00%
Real Estate Investment [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets		211,800	$ 180,500
Restricted cash [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 59,200
Land [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Area of Land | a			103
San Diego Portfolio [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings | building	[1]		6
[1]	(1)The San Diego Properties - Tranche 2 include the following: 6260 Sequence Drive, 6290 Sequence Drive, 6310 Sequence Drive, 6340 Sequence Drive, 6350 Sequence Drive, and 4921 Directors Place.

Acquisitions (Details)

Acquisitions (Details) $ in Thousands		6 Months Ended
		Jun. 30, 2015USD ($)ft²building	Dec. 31, 2014USD ($)
Business Acquisition [Line Items]
Number of buildings | building		4
Rentable square feet | ft²		506,571
Liabilities
Accounts Payable and Accrued Liabilities		$ 199,005	$ 225,830
Dexter Project [Member] [Member]
Business Acquisition [Line Items]
Payments to Acquire Land	[1],[2]	$ 49,500
[1]	Acquisition comprised of four adjacent parcels in the South Lake Union submarket of Seattle, Washington located at 330 Dexter Avenue North, 333 Dexter Avenue North, 401 Dexter Avenue North, and 400 Aurora Avenue North.
[2]	In connection with this acquisition, we also assumed $2.4 million in accrued liabilities and acquisition costs which are not included in the purchase price above. As of June 30, 2015, the underlying assets were included as undeveloped land and construction in progress in our consolidated balance sheets.

Real Estate Assets Held for S47

Real Estate Assets Held for Sale and Dispositions (Details) $ in Thousands		Jan. 15, 2015USD ($)	Jun. 30, 2015USD ($)ft²building	Dec. 31, 2014USD ($)	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)ft²building	Jun. 30, 2014USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains on sales of depreciable operating properties			$ 31,428		$ 0	$ 31,428	$ 0
Dispositions Sales Price			$ 146,200
Number of buildings | building			4			4
Proceeds from Sale of Real Estate Held-for-investment						$ 165,797	353,581
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Land and improvements			$ 19,738			19,738
Disposal Group, Including Discontinued Operation, Buildings and Improvements			94,475			94,475
Disposal Group, Including Discontinued Operation, Total real estate held-for-sale			114,213			114,213
Disposal Group, Including Discontinued Operation, Accumulated depreciation and amortization			38,667			38,667
Disposal Group, Including Discontinued Operation, Total real estate held for sale, net			75,546			75,546
Disposal Group, Including Discontinued Operation, Current receivables, net			76			76
Disposal Group, Including Discontinued Operation, Deferred rent receivables, net			2,845			2,845
Disposal Group, Including Discontinued Operation, Deferred leasing costs and acquisition-related intangible assets, net			3,040			3,040
Disposal Group, Including Discontinued Operation, Prepaid expenses and other assets, net			192			192
Disposal Group, Including Discontinued Operation, Real estate and other assets held for sale, net			81,699	$ 8,211		81,699
Disposal Group, Including Discontinued Operation, Accounts payable, accrued expenses and other liabilities			5,219			5,219
Disposal Group, Including Discontinued Operation, Deferred revenue and acquisition-related intangible liabilities, net			1,289			1,289
Disposal Group, Including Discontinued Operation, Rents received in advance and tenant security deposits			578			578
Disposal Group, Including Discontinued Operations, Liabilities and deferred revenue of real estate assets held for sale			7,086	56		7,086
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income from discontinued operations			0		600	0	1,543
Gains on dispositions of discontinued operations			0		14,689	0	104,804
Total income from discontinued operations	[1]		$ 0		15,289	$ 0	106,347
Net Rentable Area | ft²			506,571			506,571
Gain on sale of land			$ 0		$ 3,490	$ 17,268	$ 3,490
15050 NE 36th Street, Redmond, WA [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | building			1			1
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net Rentable Area | ft²			122,103			122,103
San Diego Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | building	[2]		6			6
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net Rentable Area | ft²	[3]		539,823			539,823
San Diego Properties Phase I [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | building	[4]		3			3
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net Rentable Area | ft²	[4]		384,468			384,468
Restricted cash [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Real Estate Held-for-investment				$ 59,200
Properties Held for Sale [Member] | Von Karman, Irvine, California [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Dispositions Sales Price		$ 26,000
[1]	The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.
[2]	(1)The San Diego Properties - Tranche 2 include the following: 6260 Sequence Drive, 6290 Sequence Drive, 6310 Sequence Drive, 6340 Sequence Drive, 6350 Sequence Drive, and 4921 Directors Place.
[3]	Includes six properties located in the Sorrento Mesa submarket of San Diego, California. For additional information see Note 3.
[4]	(1)The San Diego Properties - Tranche 1 include the following: 10770 Wateridge Circle, 6200 Greenwich Drive, and 6220 Greenwich Drive.

Deferred Leasing Costs and Ac48

Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net (Details) - USD ($) $ in Thousands		Jun. 30, 2015		Dec. 31, 2014
Deferred Leasing Costs and Acquisition-related Intangible Assets, Net
Total deferred leasing costs and acquisition-related intangible assets, net		$ 174,387		$ 201,926
Acquisition-related Intangible Liabilities, Net
Total acquisitions-related intangible liabilities, net	[2]	36,678	[1]	43,427
Deferred Leasing Costs [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets, Net
Finite-lived intangible assets, gross		196,967		216,102
Finite-lived intangible assets accumulated amortization		(72,992)		(74,904)
Finite-lived intangible assets, net		123,975		141,198
Above-Market Leases [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets, Net
Finite-lived intangible assets, gross		14,589		20,734
Finite-lived intangible assets accumulated amortization		(9,455)		(13,952)
Finite-lived intangible assets, net		5,134	[3]	6,782
In-Place Leases [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets, Net
Finite-lived intangible assets, gross		80,382		97,250
Finite-lived intangible assets accumulated amortization		(35,569)		(43,773)
Finite-lived intangible assets, net		44,813		53,477
Below Market Ground Lease Obligation [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets, Net
Finite-lived intangible assets, gross		490		490
Finite-lived intangible assets accumulated amortization		(25)		(21)
Finite-lived intangible assets, net		465	[4]	469
Below Market Lease [Member]
Acquisition-related Intangible Liabilities, Net
FiniteLivedIntangibleLiabilitiesGross		59,663		68,051
Accumulated amortization		(28,931)		(30,620)
Acquisition-related Intangible Liabilities, net		30,732	[5]	37,431
Above-Market Ground Lease Obligation [Member]
Acquisition-related Intangible Liabilities, Net
FiniteLivedIntangibleLiabilitiesGross		6,320		6,320
Accumulated amortization		(374)		(324)
Acquisition-related Intangible Liabilities, net		$ 5,946	[6]	$ 5,996
[1]	Excludes deferred leasing costs and acquisition-related intangible assets and liabilities related to properties held for sale at June 30, 2015.
[2]	Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets.
[3]	Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations.
[4]	Represents estimated annual amortization related to below-market ground lease obligations. Amounts will be recorded as an increase to ground lease expense in the consolidated statements of operations.
[5]	Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations.
[6]	Represents estimated annual amortization related to above-market ground lease obligations. Amounts will be recorded as a decrease to ground lease expense in the consolidated statements of operations.

Deferred Leasing Costs and Ac49

Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net (Details 1) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014	Dec. 31, 2014
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization Of Intangible Liabilities		$ (8,385)		$ (9,945)	$ (17,476)		$ (21,233)
Deferred Leasing Costs [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization of Intangible Assets	[1]	7,093		6,771
Estimated annual amortization related to acquisition-related intangibles
Remaining 2,014		12,781			12,781
2,015		23,907			23,907
2,016		21,021			21,021
2,017		17,449			17,449
2,018		13,603			13,603
Thereafter		35,214			35,214
Finite-lived intangible assets, net		123,975			123,975			$ 141,198
Above-Market Leases [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization of Intangible Assets	[2]	737		1,435
Estimated annual amortization related to acquisition-related intangibles
Remaining 2,014	[3]	884			884
2,015	[3]	1,503			1,503
2,016	[3]	1,241			1,241
2,017	[3]	831			831
2,018	[3]	643			643
Thereafter	[3]	32			32
Finite-lived intangible assets, net		5,134	[3]		5,134	[3]		6,782
In-Place Leases [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization of Intangible Assets	[1]	4,416		5,785
Estimated annual amortization related to acquisition-related intangibles
Remaining 2,014		5,872			5,872
2,015		10,452			10,452
2,016		9,112			9,112
2,017		6,373			6,373
2,018		4,714			4,714
Thereafter		8,290			8,290
Finite-lived intangible assets, net		44,813			44,813			53,477
Below Market Ground Lease Obligation [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization of Intangible Assets	[4]	2		0
Estimated annual amortization related to acquisition-related intangibles
Remaining 2,014	[5]	4			4
2,015	[5]	8			8
2,016	[5]	8			8
2,017	[5]	8			8
2,018	[5]	8			8
Thereafter	[5]	429			429
Finite-lived intangible assets, net		465	[5]		465	[5]		469
Below Market Leases [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization Of Intangible Liabilities	[6]	(3,838)		(4,021)
Estimated annual amortization related to acquisition-related intangibles
Remaining 2,014	[7]	(4,273)			(4,273)
2,015	[7]	(7,638)			(7,638)
2,016	[7]	(7,016)			(7,016)
2,017	[7]	(5,735)			(5,735)
2,018	[7]	(3,597)			(3,597)
Thereafter	[7]	(2,473)			(2,473)
Acquisition-related Intangible Liabilities, net		(30,732)	[7]		(30,732)	[7]		(37,431)
Above-Market Ground Lease Obligation [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization Of Intangible Liabilities	[8]	(25)		$ (25)
Estimated annual amortization related to acquisition-related intangibles
Remaining 2,014	[9]	(50)			(50)
2,015	[9]	(101)			(101)
2,016	[9]	(101)			(101)
2,017	[9]	(101)			(101)
2,018	[9]	(101)			(101)
Thereafter	[9]	(5,492)			(5,492)
Acquisition-related Intangible Liabilities, net		$ (5,946)	[9]		$ (5,946)	[9]		$ (5,996)
[1]	The amortization of deferred leasing costs related to lease incentives is recorded to rental income and other deferred leasing costs and in-place leases is recorded to depreciation and amortization expense in the consolidated statements of operations for the periods presented.
[2]	The amortization of above-market operating leases is recorded as a decrease to rental income in the consolidated statements of operations for the periods presented.
[3]	Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations.
[4]	The amortization of the below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented.
[5]	Represents estimated annual amortization related to below-market ground lease obligations. Amounts will be recorded as an increase to ground lease expense in the consolidated statements of operations.
[6]	The amortization of below-market operating leases is recorded as an increase to rental income in the consolidated statements of operations for the periods presented.
[7]	Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations.
[8]	The amortization of the above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented.
[9]	Represents estimated annual amortization related to above-market ground lease obligations. Amounts will be recorded as a decrease to ground lease expense in the consolidated statements of operations.

Receivables (Details)

Receivables (Details) - USD ($) $ in Thousands		Jun. 30, 2015		Dec. 31, 2014
Current Receivables, net
Current receivables	[1]	$ 10,793		$ 9,228
Allowance for uncollectible tenant receivables	[1]	(1,837)		(1,999)
Current receivables, net	[1]	8,956		7,229
Deferred Rent Receivables, net
Deferred rent receivables		178,609	[2]	158,405
Allowance for deferred rent receivables		(2,116)	[2]	(1,989)
Deferred rent receivables, net		$ 176,493	[2]	$ 156,416
[1]	Excludes current receivables, net related to properties held for sale.
[2]	Excludes deferred rent receivables, net related to properties held for sale as of June 30, 2015.

Secured Debt (Details)

Secured Debt (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Secured Debt	[1]	$ 479,368	$ 546,292
Secured Debt [Member]
Debt Instrument [Line Items]
Unamortized premium		8,100	10,300
Kilroy Realty, L.P. [Member]
Debt Instrument [Line Items]
Secured Debt		$ 479,368	546,292
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 4.27% Mortgage Payable due Feb. 01, 2018 [Member]
Debt Instrument [Line Items]
Annual Stated Interest Rate	[2]	4.27%
Effective interest rate	[2],[3]	4.27%
Maturity Date		Feb. 1, 2018
Secured Debt	[1]	$ 129,555	130,767
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 4.48% Mortgage Payable due July 1, 2027 [Member]
Debt Instrument [Line Items]
Annual Stated Interest Rate	[2]	4.48%
Effective interest rate	[2],[3]	4.48%
Maturity Date		Jul. 1, 2027
Secured Debt	[1],[4]	$ 97,000	97,000
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 6.05% Mortgage Payable Due June 1, 2019 [Member]
Debt Instrument [Line Items]
Annual Stated Interest Rate	[2]	6.05%
Effective interest rate	[2],[3]	3.50%
Maturity Date		Jun. 1, 2019
Secured Debt	[1],[4]	$ 87,575	89,242
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 6.51% Mortgage Payable due Feb. 01, 2017 [Member]
Debt Instrument [Line Items]
Annual Stated Interest Rate	[2]	6.51%
Effective interest rate	[2],[3]	6.51%
Maturity Date		Feb. 1, 2017
Secured Debt	[1]	$ 66,114	66,647
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 5.23% Mortgage Payable due Jan. 01, 2016 [Member]
Debt Instrument [Line Items]
Annual Stated Interest Rate	[2]	5.23%
Effective interest rate	[2],[3]	3.50%
Maturity Date		Jan. 1, 2016
Secured Debt	[1],[4]	$ 51,883	52,793
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 5.57% Morgage Payable Due Feb. 11, 2016 [Member]
Debt Instrument [Line Items]
Annual Stated Interest Rate	[2]	5.57%
Effective interest rate	[2],[3]	3.25%
Maturity Date		Feb. 11, 2016
Secured Debt	[1],[4]	$ 39,544	40,258
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 5.09% Mortgage Payable due Aug. 7, 2015 [Member]
Debt Instrument [Line Items]
Annual Stated Interest Rate	[2]	5.09%
Effective interest rate	[2],[3]	3.50%
Maturity Date		Aug. 7, 2015
Secured Debt	[1],[5]	$ 0	34,311
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | Four Point Nine four Percent Mortgage Payable due April Fifteen Two Thousand Fifteen [Member]
Debt Instrument [Line Items]
Annual Stated Interest Rate	[2]	4.94%
Effective interest rate	[2],[3]	4.00%
Maturity Date		Apr. 15, 2015
Secured Debt	[1],[5]	$ 0	26,285
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 7.15% Mortgage Payable due May 01, 2017 [Member]
Debt Instrument [Line Items]
Annual Stated Interest Rate	[2]	7.15%
Effective interest rate	[2],[3]	7.15%
Maturity Date		May 1, 2017
Secured Debt	[1]	$ 5,300	6,568
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | Municipal Bonds [Member]
Debt Instrument [Line Items]
Secured Debt	[1]	$ 2,397	$ 2,421
[1]	Amounts reported include the amounts of unamortized debt premiums of $8.1 million and $10.3 million as of June 30, 2015 and December 31, 2014, respectively.
[2]	All interest rates presented are fixed-rate interest rates.
[3]	This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of discounts/premiums, excluding debt issuance costs.
[4]	The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.
[5]	This mortgage note payable was repaid during the six months ended June 30, 2015 prior to maturity at par.

Exhangeable Senior Notes (Detai

Exhangeable Senior Notes (Details)		6 Months Ended	12 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Term Loan Facility [Member] | Line of Credit [Member] | Kilroy Realty, L.P. [Member]
Balance and significant terms of the Exchangeable Notes outstanding
Debt Instrument, Basis Spread on Variable Rate	[1]	0.00%	1.56%
[1]	Our unsecured term loan facility interest rate was calculated based on an annual rate of LIBOR plus 1.150% and LIBOR plus 1.400% as of June 30, 2015 and December 31, 2014, respectively.

Unsecured Senior Notes (Details

Unsecured Senior Notes (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Unsecured debt		$ 1,783,438	$ 1,783,121
Kilroy Realty, L.P. [Member]
Debt Instrument [Line Items]
Unsecured debt		$ 1,783,438	$ 1,783,121
Kilroy Realty, L.P. [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.05%	1.25%
Debt Instrument, Contingent Additional Borrowings		$ 311,000
Kilroy Realty, L.P. [Member] | Four Point Two Five Zero Percent Unsecured Senior Notes [Member] [Domain] | Senior Notes [Member]
Debt Instrument [Line Items]
Stated coupon rate		4.25%
Effective interest rate	[1],[2]	4.35%
Debt Instrument, Face Amount		$ 400,000	$ 400,000
Debt Instrument, Unamortized Discount		(4,199)	(4,348)
Unsecured debt		$ 395,801	395,652
Kilroy Realty, L.P. [Member] | 3.800% Unsecured Senior Note [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Stated coupon rate		3.80%
Effective interest rate	[2],[3]	3.804%
Debt Instrument, Face Amount		$ 300,000	300,000
Debt Instrument, Unamortized Discount		(75)	(79)
Unsecured debt		$ 299,925	299,921
Kilroy Realty, L.P. [Member] | 4.800% Unsecured Senior Notes Due July Fifteen Two Thousand Eighteen [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Stated coupon rate		4.80%
Effective interest rate	[2],[3]	4.827%
Debt Instrument, Face Amount		$ 325,000	325,000
Debt Instrument, Unamortized Discount		(228)	(265)
Unsecured debt		$ 324,772	324,735
Kilroy Realty, L.P. [Member] | 6.625% Unsecured Senior Notes due June 1 2020 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Stated coupon rate		6.625%
Effective interest rate	[2],[4]	6.743%
Debt Instrument, Face Amount		$ 250,000	250,000
Debt Instrument, Unamortized Discount		(1,047)	(1,154)
Unsecured debt		$ 248,953	248,846
Kilroy Realty, L.P. [Member] | 5.000% Unsecured Senior Notes due Nov3 2015 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Stated coupon rate		5.00%
Effective interest rate	[2],[5]	5.014%
Debt Instrument, Face Amount		$ 325,000	325,000
Debt Instrument, Unamortized Discount		(13)	(33)
Unsecured debt		$ 324,987	324,967
Kilroy Realty, L.P. [Member] | Term Loan Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Maturity Date		Jul. 1, 2019
Unsecured debt		$ 150,000	$ 150,000
Debt Instrument, Basis Spread on Variable Rate	[6]	0.00%	1.56%
[1]	Interest on these notes is payable semi-annually in arrears on February 15th and August 15th of each year.
[2]	This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of initial issuance discounts, excluding debt issuance costs.
[3]	Interest on these notes is payable semi-annually in arrears on January 15th and July 15th of each year.
[4]	Interest on these notes is payable semi-annually in arrears on June 1st and December 1st of each year.
[5]	Interest on these notes is payable semi-annually in arrears on May 3rd and November 3rd of each year.
[6]	Our unsecured term loan facility interest rate was calculated based on an annual rate of LIBOR plus 1.150% and LIBOR plus 1.400% as of June 30, 2015 and December 31, 2014, respectively.

Unsecured Revolving Credit Faci

Unsecured Revolving Credit Facility (Details 3) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2015USD ($)building	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Number of Real Estate Properties | building		4
Unsecured debt		$ 1,783,438	$ 1,783,121
Terms of the Credit Facility
Unsecured line of credit		100,000	140,000
Kilroy Realty, L.P. [Member]
Debt Instrument [Line Items]
Unsecured debt		1,783,438	1,783,121
Terms of the Credit Facility
Unsecured line of credit		100,000	140,000
Kilroy Realty, L.P. [Member] | Revolving Credit Facility [Member]
Terms of the Credit Facility
Unsecured line of credit		100,000	140,000
Remaining borrowing capacity		500,000	460,000
Total borrowing capacity	[1]	$ 600,000	$ 600,000
Line of Credit Facility, Interest Rate at Period End	[2]	1.24%	1.41%
Line of Credit Facility, Commitment Fee Percentage	[3]	0.20%	0.25%
Line of Credit Facility, Expiration Date		Jul. 1, 2019
Debt Instrument, Contingent Additional Borrowings		$ 311,000
Debt Instrument, Basis Spread on Variable Rate		1.05%	1.25%
Debt Issuance Cost		$ 5,200
Term Loan Facility [Member] | Kilroy Realty, L.P. [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Unsecured debt		$ 150,000	$ 150,000
Terms of the Credit Facility
Debt Instrument, Basis Spread on Variable Rate	[4]	0.00%	1.56%
Maturity Date		Jul. 1, 2019
Term Loan Facility [Member] | Kilroy Realty, L.P. [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Unsecured debt		$ 39,000
London Interbank Offered Rate (LIBOR) [Member] | Term Loan Facility [Member] | Kilroy Realty, L.P. [Member] | Line of Credit [Member]
Terms of the Credit Facility
Debt Instrument, Basis Spread on Variable Rate		1.15%	1.40%
[1]	We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $311.0 million under an accordion feature under the terms of the unsecured revolving credit facility and term loan facility.
[2]	Our revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.050% and LIBOR plus 1.250% as of June 30, 2015 and December 31, 2014, respectively.
[3]	Our facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs. As of June 30, 2015, $5.2 million of deferred financing costs remains to be amortized through the maturity date of our unsecured revolving credit facility.
[4]	Our unsecured term loan facility interest rate was calculated based on an annual rate of LIBOR plus 1.150% and LIBOR plus 1.400% as of June 30, 2015 and December 31, 2014, respectively.

Debt Maturities (Details)

Debt Maturities (Details) - Debt [Member] - Kilroy Realty, L.P. [Member] $ in Thousands		Jun. 30, 2015USD ($)
Stated debt maturities and scheduled amortization payments, excluding debt discounts
Remaining 2,015		$ 330,332
2,016		99,431
2,017		71,748
2,018		451,728
2,019		365,370
Thereafter		1,041,643
Total	[1]	2,360,252
Unamortized premium		$ (2,600)
[1]	Includes gross principal balance of outstanding debt before impact of net unamortized premiums totaling approximately $2.6 million

Secured and Unsecured Debt of56

Secured and Unsecured Debt of the Operating Partnership Capitalized Interest and Loan Fees (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Capitalized Interest and Loan Fees [Line Items]
Interest Expense	$ 14,864	$ 16,020	$ 31,742	$ 33,272
Kilroy Realty, L.P. [Member]
Capitalized Interest and Loan Fees [Line Items]
Gross interest expense	27,187	27,770	54,936	55,804
Capitalized interest	(12,323)	(11,750)	(23,194)	(22,532)
Interest Expense	$ 14,864	$ 16,020	$ 31,742	$ 33,272

Noncontrolling Interests on t57

Noncontrolling Interests on the Company's Consolidated Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Noncontrolling Interest [Abstract]
Percentage of general partnership interest owned by the company in the Operating Partnership	98.00%	98.00%	97.90%
Percentage of Common limited partnership interest owned by certain non-affiliated investors and certain directors and officers of the Company in the Operating Partnership	2.00%	2.00%	2.10%
Common units outstanding held by common limited partners	1,793,170	1,804,200	1,804,200
Common stock, par value	$ 0.01
Aggregate value upon redemption of outstanding noncontrolling common units	$ 124,800	$ 126,800
Noncontrolling Interest in Variable Interest Entity	$ 6,065	$ 5,862

Stockholders' Equity of the C58

Stockholders' Equity of the Company (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Common Stock of the Company [Abstract]
Net proceeds from issuance of common stock (Note 8)	$ 137,924	$ 22,136
Common Stock [Member]
Common Stock of the Company [Abstract]
Common stock, shares issued	88,405,632		86,259,684
Issuance of Equity - at the market offering [Member] | Common Stock [Member]
Common Stock of the Company [Abstract]
At Market Stock Aggregate Gross Sales Price of Common Stock	$ 150,100
March 2015 At-The-Market Program [Member]
Common Stock of the Company [Abstract]
Common stock, shares issued	2,007,767
Issuance of Equity - at the market offering [Member] | Common Stock [Member]
Class of Stock [Line Items]
At Market Stock Offering Program Aggregate Value Of Common Stock	$ 300,000
Common Stock of the Company [Abstract]
Issuance of common stock, shares (Note 8)	1,866,267
Average price per common shares sold	$ 75.06
Net proceeds from issuance of common stock (Note 8)	$ 140,100
At the Market Stock Offering Program Remained Available For Issuance	149,900
Proceeds from Issuance of Common stock, net	$ 138,200

Partners' Capital of the Oper59

Partners' Capital of the Operating Partnership (Details) - Preferred Units, Class [Domain] - Equity Component [Domain] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
General Partners' Capital Account [Abstract]
Net proceeds from issuance of common stock	$ 137,924	$ 22,136
Noncontrolling Interest, Ownership Percentage by Parent	98.00%	97.90%	98.00%
Common units held by limited partners	1,793,170	1,804,200	1,804,200
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	2.00%	2.10%	2.00%
Kilroy Realty, L.P. [Member] | Capital Units [Member]
General Partners' Capital Account [Abstract]
General Partners' Capital Account, Units Outstanding	88,405,632	82,916,410	86,259,684

Share-Based Compensation (Detai

Share-Based Compensation (Details Textuals) - USD ($) $ / shares in Units, $ in Millions	Jan. 27, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				212,468
Share Price	$ 75.34
Share-based Compensation Capitalized		$ 0.9	$ 0.5	$ 1.6	$ 0.9
Share-based Compensation, Unrecognized costs		40.3		$ 40.3
Share-based Compensation, Unrecognized costs, weighted-average vesting period				2 years 3 months
Allocated Share-based Compensation Expense		$ 5	$ 3.5	$ 9.3	$ 6.4
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 78.55
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate				20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				0.92%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				127,657
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 11 months
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Grants In Period, Grant Date Fair Value				$ 10.1
Time-Based Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				84,811
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Grants In Period, Grant Date Fair Value				$ 6.4
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price				$ 42.61
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term		750,000		750,000
Kilroy Realty 2006 Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		1,650,265		1,650,265
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Paid for Tax Withholding for Share Based Compensation				20,752	42,763
Exercise of stock options				(252,000)	(325,000)
Shareholder Meeting Date May 21, 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Requested		8,320,000		8,320,000

Commitments and Contingencies (

Commitments and Contingencies (Details 1) $ in Millions	Jun. 30, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
Other Commitment	$ 602.3
Accrued Environmental Loss Contingencies, Noncurrent	$ 16

Fair Value Measurements and D62

Fair Value Measurements and Disclosures (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair value adjustment of marketable securities and deferred compensation plan liability
Net gain on marketable securities		$ 122	$ 392	$ 510	$ 546
Trading Securities		13,803		13,803		$ 11,971
Fair Value (Level 1) [Member]
Assets and Liabilities Reported at Fair Value
Marketable securities	[1],[2]	$ 13,803		$ 13,803		$ 11,971
[1]	Based on quoted prices in active markets for identical securities.
[2]	The marketable securities are held in a limited rabbi trust.

Fair Value Measurements and D63

Fair Value Measurements and Disclosures (Details 1) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Liabilities
Secured Debt	[1]	$ 479,368	$ 546,292
Unsecured debt		1,783,438	1,783,121
Unsecured line of credit		100,000	140,000
Carrying Value
Liabilities
Secured Debt	[2]	479,368	546,292
Unsecured debt	[3]	1,783,438	1,783,121
Unsecured line of credit	[2]	100,000	140,000
Carrying Value | Fair Value (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure		189,000	513,700
Carrying Value | Unsecured Debt [Member] | Fair Value (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure		1,594,400	1,269,400
Fair Value
Liabilities
Secured Debt	[2]	492,793	559,483
Unsecured debt	[3]	1,834,097	1,858,492
Unsecured line of credit	[2]	100,021	145,051
Fair Value | Fair Value (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure		189,000	536,300
Fair Value | Unsecured Debt [Member] | Fair Value (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure		$ 1,645,100	$ 1,322,200
[1]	Amounts reported include the amounts of unamortized debt premiums of $8.1 million and $10.3 million as of June 30, 2015 and December 31, 2014, respectively.
[2]	Fair value calculated using Level II inputs, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.
[3]	Fair value calculated using Level I and Level II inputs. Level I inputs are based on quoted prices for identical instruments in active markets. The carrying value and fair value of the Level I instruments was $1,594.4 million and $1,645.1 million, respectively, as of June 30, 2015. The carrying value and fair value of the Level I instruments as of December 31, 2014, was $1,269.4 million and $1,322.2 million, respectively. The carrying value and fair value of the Level II instruments was $189.0 million and $189.0 million, respectively, as of June 30, 2015. The carrying value and fair value of the Level II instruments as of December 31, 2014, was $513.7 million and $536.3 million, respectively.

Net Income Available to Commo64

Net Income Available to Common Stockholders Per Share of the Company (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014
Numerator:
Income from continuing operations		$ 58,590		$ 15,854		$ 102,592	$ 26,728
(Income) Loss from continuing operations attributable to noncontrolling common units of the Operating Partnership		(1,090)		(282)		(1,905)	(442)
Preferred dividends		(3,312)		(3,312)		(6,625)	(6,625)
Allocation to participating securities	[1]	(418)		(426)		(833)	(853)
Numerator for basic and diluted income from continuing operations available to common stockholders		53,770		11,834		93,229	18,808
Income from discontinued operations	[2]	0		15,289		0	106,347
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership	[2]	0		(321)		0	(2,248)
Numerator for basic and diluted net income available to common stockholders		$ 53,770		$ 26,802		$ 93,229	$ 122,907
Denominator:
Weighted average common shares outstanding – basic (Note 13)		88,126,187		82,277,845		87,514,878	82,201,615
Effect of dilutive securities		519,681		2,324,487		529,414	2,173,640
Weighted average common shares outstanding-diluted		88,645,868		84,602,332		88,044,292	84,375,255
Basic earnings per share:
Income (loss) from continuing operations available to common stockholders per common share – basic (Note 13)		$ 0.61		$ 0.14		$ 1.07	$ 0.23
Income from discontinued operations per common share	[2]	0		0.19		0	1.26
Net income available to common stockholders per share-basic		0.61		0.33		1.07	1.49
Diluted earnings per share:
Income from continuing operations available to common stockholders per common share – diluted (Note 13)		0.61		0.14		1.06	0.22
Income from discontinued operations per common share	[2]	0		0.18		0	1.24
Net income available to common stockholders per share-diluted		$ 0.61		$ 0.32		$ 1.06	$ 1.46
Kilroy Realty, L.P. [Member]
Numerator:
Income from continuing operations		$ 58,590		$ 15,854		$ 102,592	$ 26,728
(Income) Loss from continuing operations attributable to noncontrolling common units of the Operating Partnership		(72)		(64)		(147)	(129)
Preferred dividends		(3,312)		(3,312)		(6,625)	(6,625)
Allocation to participating securities	[3]	(418)		(426)		(833)	(853)
Numerator for basic and diluted income from continuing operations available to common stockholders		54,788		12,052		94,987	19,121
Income from discontinued operations		0	[4]	15,289	[4]	0	106,347	[4]
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership	[4]	0		(13)		0	(13)
Numerator for basic and diluted net income available to common stockholders		$ 54,788		$ 27,328		$ 94,987	$ 125,455
Denominator:
Weighted average common shares outstanding – basic (Note 13)		89,919,357		84,082,045		89,309,718	84,005,942
Effect of dilutive securities		519,681		2,324,487		529,414	2,173,640
Weighted average common shares outstanding-diluted		90,439,038		86,406,532		89,839,132	86,179,582
Basic earnings per share:
Income (loss) from continuing operations available to common stockholders per common share – basic (Note 13)		$ 0.61		$ 0.14		$ 1.06	$ 0.23
Income from discontinued operations per common share	[4]	0		0.19		0	1.26
Net income available to common stockholders per share-basic		0.61		0.33		1.06	1.49
Diluted earnings per share:
Income from continuing operations available to common stockholders per common share – diluted (Note 13)		0.61		0.14		1.06	0.22
Income from discontinued operations per common share	[4]	0		0.18		0	1.24
Net income available to common stockholders per share-diluted		$ 0.61		$ 0.32		$ 1.06	$ 1.46
[1]	Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs.
[2]	The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.
[3]	Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs.
[4]	The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.

Net Income Available to Commo65

Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014
Numerator:
Income from continuing operations		$ 58,590		$ 15,854		$ 102,592	$ 26,728
(Income) Loss from continuing operations attributable to noncontrolling common units of the Operating Partnership		(1,090)		(282)		(1,905)	(442)
Preferred distributions		(3,312)		(3,312)		(6,625)	(6,625)
Allocation to participating securities	[1]	(418)		(426)		(833)	(853)
Numerator for basic and diluted income from continuing operations available to common unitholders		53,770		11,834		93,229	18,808
Income from discontinued operations	[2]	0		15,289		0	106,347
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership	[2]	0		(321)		0	(2,248)
Numerator for basic and diluted net income available to common unitholders		$ 53,770		$ 26,802		$ 93,229	$ 122,907
Denominator:
Weighted average common units outstanding - basic (Note 14)		88,126,187		82,277,845		87,514,878	82,201,615
Effect of dilutive securities		519,681		2,324,487		529,414	2,173,640
Weighted average common units outstanding - diluted (Note 14)		88,645,868		84,602,332		88,044,292	84,375,255
Basic earnings per unit:
Income (loss) from continuing operations available to common unitholders per unit - basic (Note 14)		$ 0.61		$ 0.14		$ 1.07	$ 0.23
Income from discontinued operations per common unit	[2]	0		0.19		0	1.26
Net income available to common unitholders per unit-basic (Note 14)		0.61		0.33		1.07	1.49
Diluted earnings per unit:
Income (loss) from continuing operations available to common unitholders per unit - diluted (Note 15)		0.61		0.14		1.06	0.22
Income from discontinued operations per common unit	[2]	0		0.18		0	1.24
Net income available to common unitholders per unit-diluted (Note 14)		$ 0.61		$ 0.32		$ 1.06	$ 1.46
Kilroy Realty, L.P. [Member]
Numerator:
Income from continuing operations		$ 58,590		$ 15,854		$ 102,592	$ 26,728
(Income) Loss from continuing operations attributable to noncontrolling common units of the Operating Partnership		(72)		(64)		(147)	(129)
Preferred distributions		(3,312)		(3,312)		(6,625)	(6,625)
Allocation to participating securities	[3]	(418)		(426)		(833)	(853)
Numerator for basic and diluted income from continuing operations available to common unitholders		54,788		12,052		94,987	19,121
Income from discontinued operations		0	[4]	15,289	[4]	0	106,347	[4]
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership	[4]	0		(13)		0	(13)
Numerator for basic and diluted net income available to common unitholders		$ 54,788		$ 27,328		$ 94,987	$ 125,455
Denominator:
Weighted average common units outstanding - basic (Note 14)		89,919,357		84,082,045		89,309,718	84,005,942
Effect of dilutive securities		519,681		2,324,487		529,414	2,173,640
Weighted average common units outstanding - diluted (Note 14)		90,439,038		86,406,532		89,839,132	86,179,582
Basic earnings per unit:
Income (loss) from continuing operations available to common unitholders per unit - basic (Note 14)		$ 0.61		$ 0.14		$ 1.06	$ 0.23
Income from discontinued operations per common unit	[4]	0		0.19		0	1.26
Net income available to common unitholders per unit-basic (Note 14)		0.61		0.33		1.06	1.49
Diluted earnings per unit:
Income (loss) from continuing operations available to common unitholders per unit - diluted (Note 15)		0.61		0.14		1.06	0.22
Income from discontinued operations per common unit	[4]	0		0.18		0	1.24
Net income available to common unitholders per unit-diluted (Note 14)		$ 0.61		$ 0.32		$ 1.06	$ 1.46
[1]	Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs.
[2]	The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.
[3]	Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs.
[4]	The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 1). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 16, 2015	Jul. 15, 2015	Jul. 07, 2015	Jul. 01, 2015	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Jul. 29, 2015	Dec. 31, 2013
Subsequent Event [Line Items]
Net proceeds from issuance of common stock (Note 8)							$ 137,924	$ 22,136
Aggregate dividends, distributions, and dividend equivalents paid to common stockholders and common unitholders							62,311	58,864
Dispositions Sales Price					$ 146,200
Net proceeds received from dispositions of land and operating properties (Note 3)							165,797	353,581
Cash and Cash Equivalents, at Carrying Value					28,142	$ 23,781	28,142	$ 24,571		$ 35,377
Restricted Cash and Cash Equivalents					$ 7,462	$ 75,185	$ 7,462
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues				3,773,766
Net proceeds from issuance of common stock (Note 8)				$ 249,600
Aggregate dividends, distributions, and dividend equivalents paid to common stockholders and common unitholders		$ 32,000
San Diego Properties, San Diego, CA [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Dispositions Sales Price		$ 163,000
100 Hooper, SF CA [Member] [Member] [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Payments to Acquire Land			$ 78,000
Common Stock [Member]
Subsequent Event [Line Items]
Common Stock, Shares, Issued					88,405,632	86,259,684	88,405,632
Common Stock [Member] | Issuance of Equity under ATM Program [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues							1,866,267
Net proceeds from issuance of common stock (Note 8)							$ 140,100
Average price per common shares sold							$ 75.06
Cash and Cash Equivalents [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Cash and Cash Equivalents, at Carrying Value									$ 0
Restricted cash [Member]
Subsequent Event [Line Items]
Net proceeds received from dispositions of land and operating properties (Note 3)						$ 59,200
Restricted cash [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Net proceeds received from dispositions of land and operating properties (Note 3)	$ 0