Kilroy Realty (KRC) 10-Q 28 Jul 22 2022 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2022	Jul. 22, 2022
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	1-12675
Entity Registrant Name	KILROY REALTY CORPORATION
Entity Incorporation, State Code	MD
Entity Tax Identification Number	95-4598246
Entity Address, Address Line One	12200 W. Olympic Boulevard
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Los Angeles
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90064
City Area Code	310
Local Phone Number	481-8400
Title of 12(b) Security	Common Stock, $.01 par value
Security Exchange Name	NYSE
Trading Symbol	KRC
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		116,870,970
Entity Central Index Key	0001025996
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false
Kilroy Realty L.P.
Entity Information [Line Items]
Entity File Number	000-54005
Entity Registrant Name	KILROY REALTY, L.P.
Entity Incorporation, State Code	DE
Entity Tax Identification Number	95-4612685
Title of 12(g) Security	Common Units Representing Limited Partnership Interests
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001493976
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
REAL ESTATE ASSETS (Note 2):
Land and improvements	$ 1,713,152	$ 1,731,982
Buildings and improvements	7,530,547	7,543,585
Undeveloped land and construction in progress	2,272,508	2,017,126
Total real estate assets held for investment	11,516,207	11,292,693
Accumulated depreciation and amortization	(2,104,990)	(2,003,656)
Total real estate assets held for investment, net	9,411,217	9,289,037
CASH AND CASH EQUIVALENTS	210,044	414,077
RESTRICTED CASH	13,008	13,006
MARKETABLE SECURITIES (Note 10)	22,988	27,475
CURRENT RECEIVABLES, NET	13,268	14,386
DEFERRED RENT RECEIVABLES, NET	435,549	405,665
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET	217,026	234,458
RIGHT OF USE GROUND LEASE ASSETS	126,587	127,302
PREPAID EXPENSES AND OTHER ASSETS, NET	65,554	57,991
TOTAL ASSETS	10,515,241	10,583,397
LIABILITIES:
Secured debt, net (Notes 3 and 10)	245,680	248,367
Unsecured debt, net (Notes 3 and 10)	3,822,482	3,820,383
Accounts payable, accrued expenses and other liabilities	357,253	391,264
Ground lease liabilities	125,277	125,550
Accrued dividends and distributions (Note 15)	61,880	61,850
Deferred revenue and acquisition-related intangible liabilities, net	176,845	171,151
Rents received in advance and tenant security deposits	73,273	74,962
Total liabilities	4,862,690	4,893,527
COMMITMENTS AND CONTINGENCIES (Note 9)
Stockholders’ Equity
Common stock, $.01 par value, 280,000,000 shares authorized, 116,870,970 and 116,464,169 shares issued and outstanding, respectively	1,169	1,165
Additional paid-in capital	5,151,705	5,155,232
Retained earnings	260,020	283,663
Total stockholders’ equity	5,412,894	5,440,060
Noncontrolling Interests
Common units of the Operating Partnership	53,289	53,746
Noncontrolling interests in consolidated property partnerships	186,368	196,064
Total noncontrolling interests	239,657	249,810
Total equity	5,652,551	5,689,870
TOTAL LIABILITIES AND EQUITY (CAPITAL)	10,515,241	10,583,397
Kilroy Realty L.P.
REAL ESTATE ASSETS (Note 2):
Land and improvements	1,713,152	1,731,982
Buildings and improvements	7,530,547	7,543,585
Undeveloped land and construction in progress	2,272,508	2,017,126
Total real estate assets held for investment	11,516,207	11,292,693
Accumulated depreciation and amortization	(2,104,990)	(2,003,656)
Total real estate assets held for investment, net	9,411,217	9,289,037
CASH AND CASH EQUIVALENTS	210,044	414,077
RESTRICTED CASH	13,008	13,006
MARKETABLE SECURITIES (Note 10)	22,988	27,475
CURRENT RECEIVABLES, NET	13,268	14,386
DEFERRED RENT RECEIVABLES, NET	435,549	405,665
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET	217,026	234,458
RIGHT OF USE GROUND LEASE ASSETS	126,587	127,302
PREPAID EXPENSES AND OTHER ASSETS, NET	65,554	57,991
TOTAL ASSETS	10,515,241	10,583,397
LIABILITIES:
Secured debt, net (Notes 3 and 10)	245,680	248,367
Unsecured debt, net (Notes 3 and 10)	3,822,482	3,820,383
Accounts payable, accrued expenses and other liabilities	357,253	391,264
Ground lease liabilities	125,277	125,550
Accrued dividends and distributions (Note 15)	61,880	61,850
Deferred revenue and acquisition-related intangible liabilities, net	176,845	171,151
Rents received in advance and tenant security deposits	73,273	74,962
Total liabilities	4,862,690	4,893,527
COMMITMENTS AND CONTINGENCIES (Note 9)
Noncontrolling Interests
Common units, 116,716,080 and 116,464,169 held by the general partner and 1,150,574 and 1,150,574 held by common limited partners issued and outstanding, respectively	5,466,183	5,493,806
Noncontrolling interests in consolidated property partnerships	186,368	196,064
Total capital	5,652,551	5,689,870
TOTAL LIABILITIES AND EQUITY (CAPITAL)	$ 10,515,241	$ 10,583,397

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	280,000,000	280,000,000
Common stock, shares issued (in shares)	116,870,970	116,464,169
Common stock, shares outstanding (in shares)	116,870,970	116,464,169
Common Units | Kilroy Realty L.P.
General partner, units issued (in shares)	116,870,970	116,464,169
General partners, units outstanding (in shares)	116,870,970	116,464,169
Limited partners, units issued (in shares)	1,150,574	1,150,574
Limited partners, units outstanding (in shares)	1,150,574	1,150,574

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]
REVENUES
Rental income (Note 8)	$ 268,576	$ 224,473	$ 531,784	$ 459,129
Other property income	2,608	1,510	4,901	2,500
Total revenues	271,184	225,983	536,685	461,629
EXPENSES
Property expenses	49,922	40,482	95,346	79,341
Real estate taxes	25,433	22,109	51,303	47,375
Ground leases	1,876	2,023	3,702	3,851
General and administrative expenses (Note 7)	22,120	24,507	44,901	46,492
Leasing costs	1,447	883	2,460	1,575
Depreciation and amortization	96,415	73,589	185,075	149,521
Total expenses	197,213	163,593	382,787	328,155
OTHER INCOME (EXPENSES)
Interest and other income, net	125	1,337	206	2,710
Interest expense (Note 3)	(20,121)	(21,390)	(40,746)	(43,724)
Gain on sale of depreciable operating property	0	543	0	457,831
Total other (expenses) income	(19,996)	(19,510)	(40,540)	416,817
NET INCOME	53,975	42,880	113,358	550,291
Net income attributable to noncontrolling common units of the Operating Partnership	(515)	(354)	(1,031)	(5,240)
Net income attributable to noncontrolling interests in consolidated property partnerships	(6,355)	(6,687)	(12,094)	(11,581)
Total income attributable to noncontrolling interests	(6,870)	(7,041)	(13,125)	(16,821)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 47,105	$ 35,839	$ 100,233	$ 533,470
Net income available to common stockholders per share – basic (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.58
Net income available to common stockholders per share – diluted (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.56
Weighted average common shares outstanding – basic (in shares)	116,822,234	116,451,931	116,736,706	116,398,450
Weighted average common shares outstanding – diluted (in shares)	117,184,938	116,917,463	117,122,861	116,859,745
Kilroy Realty L.P.
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]
REVENUES
Rental income (Note 8)	$ 268,576	$ 224,473	$ 531,784	$ 459,129
Other property income	2,608	1,510	4,901	2,500
Total revenues	271,184	225,983	536,685	461,629
EXPENSES
Property expenses	49,922	40,482	95,346	79,341
Real estate taxes	25,433	22,109	51,303	47,375
Ground leases	1,876	2,023	3,702	3,851
General and administrative expenses (Note 7)	22,120	24,507	44,901	46,492
Leasing costs	1,447	883	2,460	1,575
Depreciation and amortization	96,415	73,589	185,075	149,521
Total expenses	197,213	163,593	382,787	328,155
OTHER INCOME (EXPENSES)
Interest and other income, net	125	1,337	206	2,710
Interest expense (Note 3)	(20,121)	(21,390)	(40,746)	(43,724)
Gain on sale of depreciable operating property	0	543	0	457,831
Total other (expenses) income	(19,996)	(19,510)	(40,540)	416,817
NET INCOME	53,975	42,880	113,358	550,291
Total income attributable to noncontrolling interests	(6,355)	(6,687)	(12,094)	(11,581)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 47,620	$ 36,193	$ 101,264	$ 538,710
Net income available to common stockholders per share – basic (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.58
Net income available to common stockholders per share – diluted (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.56
Weighted average common shares outstanding – basic (in shares)	117,972,808	117,602,505	117,887,280	117,549,024
Weighted average common shares outstanding – diluted (in shares)	118,335,512	118,068,037	118,273,435	118,010,319

CONSOLIDATED STATEMENTS OF EQUI

CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stock- holders’ Equity	Common Stock	Additional Paid-in Capital	Retained Earnings (Distributions in Excess of Earnings)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2020			116,035,827
Beginning balance at Dec. 31, 2020	$ 5,277,321	$ 5,029,943	$ 1,160	$ 5,131,916	$ (103,133)	$ 247,378
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	507,411	497,631			497,631	9,780
Issuance of share-based compensation awards	1,950	1,950		1,950
Non-cash amortization of share-based compensation (Note 7)	9,604	9,604		9,604
Settlement of restricted stock units for shares of common stock (in shares)			769,701
Settlement of restricted stock units for shares of common stock	0		$ 8	(8)
Repurchase of common stock and restricted stock units (in shares)			(355,158)
Repurchase of common stock and restricted stock units	(21,137)	(21,137)	$ (3)	(21,134)
Distributions to noncontrolling interests in consolidated property partnerships	(11,680)					(11,680)
Adjustment for noncontrolling interest	0	256		256		(256)
Dividends declared per common share and common unit	(60,577)	(60,002)			(60,002)	(575)
Ending balance (in shares) at Mar. 31, 2021			116,450,370
Ending balance at Mar. 31, 2021	5,702,892	5,458,245	$ 1,165	5,122,584	334,496	244,647
Beginning balance (in shares) at Dec. 31, 2020			116,035,827
Beginning balance at Dec. 31, 2020	5,277,321	5,029,943	$ 1,160	5,131,916	(103,133)	247,378
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	550,291
Ending balance (in shares) at Jun. 30, 2021			116,454,210
Ending balance at Jun. 30, 2021	5,693,465	5,446,943	$ 1,165	5,134,320	311,458	246,522
Beginning balance (in shares) at Mar. 31, 2021			116,450,370
Beginning balance at Mar. 31, 2021	5,702,892	5,458,245	$ 1,165	5,122,584	334,496	244,647
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,880	35,839			35,839	7,041
Issuance of share-based compensation awards	645	645		645
Non-cash amortization of share-based compensation (Note 7)	11,193	11,193		11,193
Settlement of restricted stock units for shares of common stock (in shares)			3,840
Settlement of restricted stock units for shares of common stock	0
Distributions to noncontrolling interests in consolidated property partnerships	(4,692)					(4,692)
Adjustment for noncontrolling interest	0	(102)		(102)		102
Dividends declared per common share and common unit	(59,453)	(58,877)			(58,877)	(576)
Ending balance (in shares) at Jun. 30, 2021			116,454,210
Ending balance at Jun. 30, 2021	$ 5,693,465	5,446,943	$ 1,165	5,134,320	311,458	246,522
Beginning balance (in shares) at Dec. 31, 2021	116,464,169		116,464,169
Beginning balance at Dec. 31, 2021	$ 5,689,870	5,440,060	$ 1,165	5,155,232	283,663	249,810
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	59,383	53,128			53,128	6,255
Issuance of share-based compensation awards	1,942	1,942		1,942
Non-cash amortization of share-based compensation (Note 7)	6,598	6,598		6,598
Settlement of restricted stock units for shares of common stock (in shares)			459,050
Settlement of restricted stock units for shares of common stock	0		$ 5	(5)
Repurchase of common stock and restricted stock units (in shares)			(207,139)
Repurchase of common stock and restricted stock units	(13,994)	(13,994)	$ (3)	(13,991)
Distributions to noncontrolling interests in consolidated property partnerships	(14,842)					(14,842)
Adjustment for noncontrolling interest	0	192		192		(192)
Dividends declared per common share and common unit	(63,196)	(62,598)			(62,598)	(598)
Ending balance (in shares) at Mar. 31, 2022			116,716,080
Ending balance at Mar. 31, 2022	$ 5,665,761	5,425,328	$ 1,167	5,149,968	274,193	240,433
Beginning balance (in shares) at Dec. 31, 2021	116,464,169		116,464,169
Beginning balance at Dec. 31, 2021	$ 5,689,870	5,440,060	$ 1,165	5,155,232	283,663	249,810
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 113,358
Ending balance (in shares) at Jun. 30, 2022	116,870,970		116,870,970
Ending balance at Jun. 30, 2022	$ 5,652,551	5,412,894	$ 1,169	5,151,705	260,020	239,657
Beginning balance (in shares) at Mar. 31, 2022			116,716,080
Beginning balance at Mar. 31, 2022	5,665,761	5,425,328	$ 1,167	5,149,968	274,193	240,433
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,975	47,105			47,105	6,870
Issuance of share-based compensation awards	635	635		635
Non-cash amortization of share-based compensation (Note 7)	9,665	9,665		9,665
Settlement of restricted stock units for shares of common stock (in shares)			273,382
Settlement of restricted stock units for shares of common stock	0		$ 2	(2)
Repurchase of common stock and restricted stock units (in shares)			(118,492)
Repurchase of common stock and restricted stock units	(8,660)	(8,660)	$ 0	(8,660)
Distributions to noncontrolling interests in consolidated property partnerships	(6,948)					(6,948)
Adjustment for noncontrolling interest	0	99		99		(99)
Dividends declared per common share and common unit	$ (61,877)	(61,278)			(61,278)	(599)
Ending balance (in shares) at Jun. 30, 2022	116,870,970		116,870,970
Ending balance at Jun. 30, 2022	$ 5,652,551	$ 5,412,894	$ 1,169	$ 5,151,705	$ 260,020	$ 239,657

CONSOLIDATED STATEMENTS OF EQ_2

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share and common unit (in dollars per share)	$ 0.52	$ 0.52	$ 0.500	$ 0.500

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 113,358	$ 550,291
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	181,719	146,468
Depreciation of non-real estate furniture, fixtures and equipment	3,356	3,053
Revenue (recoveries) reversals for doubtful accounts, net (Note 8)	(1,513)	746
Non-cash amortization of share-based compensation awards	13,216	17,415
Non-cash amortization of deferred financing costs and debt discounts	1,637	1,590
Non-cash amortization of net below market rents	(5,631)	(2,194)
Gain on sale of depreciable operating property	0	(457,831)
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements	(9,204)	(8,915)
Straight-line rents	(28,033)	(31,029)
Amortization of right of use ground lease assets	715	424
Net change in other operating assets	(5,135)	(3,622)
Net change in other operating liabilities	14,464	70
Net cash provided by operating activities	278,949	216,466
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisitions of development properties and undeveloped land (Note 2)	(40,033)	(586,927)
Expenditures for development and redevelopment properties and undeveloped land	(227,174)	(263,227)
Expenditures for operating properties and other capital assets	(45,512)	(63,903)
Net proceeds received from disposition	0	1,013,359
Net decrease in acquisition-related deposits	0	(4,000)
Net cash (used in) provided by investing activities	(312,719)	95,302
CASH FLOWS FROM FINANCING ACTIVITIES:
Financing costs	(601)	(7,569)
Repurchase of common stock and restricted stock units	(22,654)	(21,137)
Distributions to noncontrolling interests in consolidated property partnerships	(21,806)	(16,389)
Dividends and distributions paid to common stockholders and common unitholders	(122,450)	(117,394)
Principal payments and repayments of secured debt	(2,750)	(2,645)
Net cash used in financing activities	(170,261)	(165,134)
Net (decrease) increase in cash and cash equivalents and restricted cash	(204,031)	146,634
Cash and cash equivalents and restricted cash, beginning of period	427,083	823,130
Cash and cash equivalents and restricted cash, end of period	223,052	969,764
Kilroy Realty L.P.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	113,358	550,291
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	181,719	146,468
Depreciation of non-real estate furniture, fixtures and equipment	3,356	3,053
Revenue (recoveries) reversals for doubtful accounts, net (Note 8)	(1,513)	746
Non-cash amortization of share-based compensation awards	13,216	17,415
Non-cash amortization of deferred financing costs and debt discounts	1,637	1,590
Non-cash amortization of net below market rents	(5,631)	(2,194)
Gain on sale of depreciable operating property	0	(457,831)
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements	(9,204)	(8,915)
Straight-line rents	(28,033)	(31,029)
Amortization of right of use ground lease assets	715	424
Net change in other operating assets	(5,135)	(3,622)
Net change in other operating liabilities	14,464	70
Net cash provided by operating activities	278,949	216,466
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisitions of development properties and undeveloped land (Note 2)	(40,033)	(586,927)
Expenditures for development and redevelopment properties and undeveloped land	(227,174)	(263,227)
Expenditures for operating properties and other capital assets	(45,512)	(63,903)
Net proceeds received from disposition	0	1,013,359
Net decrease in acquisition-related deposits	0	(4,000)
Net cash (used in) provided by investing activities	(312,719)	95,302
CASH FLOWS FROM FINANCING ACTIVITIES:
Financing costs	(601)	(7,569)
Repurchase of common stock and restricted stock units	(22,654)	(21,137)
Distributions to noncontrolling interests in consolidated property partnerships	(21,806)	(16,389)
Dividends and distributions paid to common stockholders and common unitholders	(122,450)	(117,394)
Principal payments and repayments of secured debt	(2,750)	(2,645)
Net cash used in financing activities	(170,261)	(165,134)
Net (decrease) increase in cash and cash equivalents and restricted cash	(204,031)	146,634
Cash and cash equivalents and restricted cash, beginning of period	427,083	823,130
Cash and cash equivalents and restricted cash, end of period	$ 223,052	$ 969,764

CONSOLIDATED STATEMENTS OF CAPI

CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	$ 53,975	$ 59,383	$ 42,880	$ 507,411	$ 113,358	$ 550,291
Non-cash amortization of share-based compensation (Note 7)	9,665	6,598	11,193	9,604
Settlement of restricted stock units	0	0	0	0
Distributions to noncontrolling interests in consolidated property partnerships	(6,948)	(14,842)	(4,692)	(11,680)
Kilroy Realty L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	5,665,761	5,689,870	5,702,892	5,277,321	5,689,870	5,277,321
Net income	53,975	59,383	42,880	507,411	113,358	550,291
Issuance of share-based compensation awards	635	1,942	645	1,950
Non-cash amortization of share-based compensation (Note 7)	9,665	6,598	11,193	9,604
Settlement of restricted stock units	0	0	0	0
Repurchase of common units and restricted stock units	(8,660)	(13,994)		(21,137)
Distributions to noncontrolling interests in consolidated property partnerships	(6,948)	(14,842)	(4,692)	(11,680)
Distributions declared per common unit	(61,877)	(63,196)	(59,453)	(60,577)
Ending balance	$ 5,652,551	$ 5,665,761	$ 5,693,465	$ 5,702,892	$ 5,652,551	$ 5,693,465
Partners’ Capital | Kilroy Realty L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in shares)	117,866,654	117,614,743	117,600,944	117,186,401	117,614,743	117,186,401
Beginning balance	$ 5,478,800	$ 5,493,806	$ 5,512,175	$ 5,079,818	$ 5,493,806	$ 5,079,818
Net income	47,620	53,644	36,193	502,517
Issuance of share-based compensation awards	635	1,942	645	1,950
Non-cash amortization of share-based compensation (Note 7)	$ 9,665	$ 6,598	$ 11,193	$ 9,604
Settlement of restricted stock units (in shares)	273,382	459,050	3,840	769,701
Repurchase of common units, stock options and restricted stock units (in shares)	(118,492)	(207,139)		(355,158)
Repurchase of common units and restricted stock units	$ (8,660)	$ (13,994)		$ (21,137)
Distributions declared per common unit	$ (61,877)	$ (63,196)	$ (59,453)	$ (60,577)
Ending balance (in shares)	118,021,544	117,866,654	117,604,784	117,600,944	118,021,544	117,604,784
Ending balance	$ 5,466,183	$ 5,478,800	$ 5,500,753	$ 5,512,175	$ 5,466,183	$ 5,500,753
Noncontrolling Interests in Consolidated Property Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	6,870	6,255	7,041	9,780
Distributions to noncontrolling interests in consolidated property partnerships	(6,948)	(14,842)	(4,692)	(11,680)
Noncontrolling Interests in Consolidated Property Partnerships | Kilroy Realty L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	186,961	196,064	190,717	197,503	196,064	197,503
Net income	6,355	5,739	6,687	4,894
Distributions to noncontrolling interests in consolidated property partnerships	(6,948)	(14,842)	(4,692)	(11,680)
Ending balance	$ 186,368	$ 186,961	$ 192,712	$ 190,717	$ 186,368	$ 192,712

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Kilroy Realty L.P.
Dividends declared per common unit (in dollars per unit)	$ 0.52	$ 0.52	$ 0.500	$ 0.500

Organization, Ownership and Bas

Organization, Ownership and Basis of Presentation	6 Months Ended
	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Ownership and Basis of Presentation	Organization, Ownership and Basis of Presentation Organization and Ownership Kilroy Realty Corporation (the “Company”) is a self-administered real estate investment trust (“REIT”) active in premier office, life science and mixed-use submarkets in the United States. We own, develop, acquire and manage real estate assets, consisting primarily of Class A properties in Greater Los Angeles, San Diego County, the San Francisco Bay Area, Greater Seattle and Austin, Texas, 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”). 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 properties at June 30, 2022: Number of Rentable Number of Percentage Occupied (1) Percentage Leased Stabilized Office Properties (2) 118 15,808,559 414 91.4 % 93.7 % ________________________ (1) Represents economic occupancy. (2) Includes stabilized life science and retail space. Number of Number of 2022 Average Occupancy Stabilized Residential Properties 3 1,001 93.7 % Our stabilized portfolio includes all of our properties with the exception of development properties currently committed for construction, under construction, or in the tenant improvement phase, redevelopment properties under construction, undeveloped land and real estate assets held for sale. 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. We define properties in the tenant improvement phase as office and life science properties that we are developing or redeveloping where the project has reached cold shell condition and is ready for tenant improvements, which may require additional major base building construction before being placed in service. Projects in the tenant improvement phase are added to our stabilized portfolio once the project reaches the earlier of 95% occupancy or one year from the date of the cessation of major base building construction activities. Costs capitalized to construction in progress for development and redevelopment properties are transferred to land and improvements, buildings and improvements, and deferred leasing costs on our consolidated balance sheets at the historical cost of the property as the projects or phases of projects are placed in service. During the six months ended June 30, 2022, we added one development project to our stabilized portfolio consisting of one building totaling 618,766 square feet of office space in Seattle, Washington. As of June 30, 2022, the following properties were excluded from our stabilized portfolio. We did not have any properties held for sale at June 30, 2022. Number of Estimated Rentable Square Feet (1) In-process development projects - tenant improvement 2 969,000 In-process development projects - under construction 2 946,000 In-process redevelopment projects - under construction 3 344,000 ________________________ (1) Estimated rentable square feet upon completion. Our stabilized portfolio also excludes our future development pipeline, which as of June 30, 2022 was comprised of eight future development sites, representing approximately 64 gross acres of undeveloped land. As of June 30, 2022, all of our properties, development projects and redevelopment projects were owned and all of our business was conducted in the state of California with the exception of ten stabilized office properties and one future development project located in the state of Washington, and one development project in the tenant improvement phase and one future development project in Austin, Texas. All of our properties, development projects and redevelopment projects are 100% owned, excluding four office properties owned by three consolidated property partnerships. Two of the three consolidated property partnerships, 100 First Street Member, LLC (“100 First LLC”) and 303 Second Street Member, LLC (“303 Second LLC”), each owned one office property in San Francisco, California through subsidiary REITs. As of June 30, 2022, the Company owned a 56% common equity interest in both 100 First LLC and 303 Second LLC. The third consolidated property partnership, Redwood City Partners, LLC (“Redwood LLC”) owned two office properties in Redwood City, California. As of June 30, 2022, the Company owned an approximate 93% common equity interest in Redwood LLC. The remaining interests in all three property partnerships were owned by unrelated third parties. Ownership and 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, 303 Second LLC, 100 First LLC, 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, 303 Second LLC, 100 First LLC, Redwood LLC and all of our wholly-owned and controlled subsidiaries. All intercompany balances and transactions have been eliminated in the consolidated financial statements. As of June 30, 2022, the Company owned an approximate 99.0% common general partnership interest in the Operating Partnership. The remaining approximate 1.0% common limited partnership interest in the Operating Partnership as of June 30, 2022 was owned by non-affiliated investors and certain of our executive officers and directors. 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”. With the exception of the Operating Partnership and our consolidated property partnerships, all of our subsidiaries are wholly-owned. 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, 2022. 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, 2021. Variable Interest Entities The Operating Partnership is a variable interest entity (“VIE”) that is consolidated by the Company as the primary beneficiary as the Operating Partnership is a limited partnership in which the common limited partners do not have substantive kick-out or participating rights. At June 30, 2022, the consolidated financial statements of the Company included three VIEs in addition to the Operating Partnership: 100 First LLC, 303 Second LLC and one entity established during the first quarter of 2022 to facilitate potential future Section 1031 Exchanges. At June 30, 2022, the Company and the Operating Partnership were determined to be the primary beneficiaries of these three VIEs since we had the ability to control the activities that most significantly impact each of the VIEs’ economic performance. As of June 30, 2022, the three VIEs’ total assets, liabilities and noncontrolling interests included on our consolidated balance sheet were approximately $477.1 million (of which $409.6 million related to real estate held for investment), approximately $25.4 million and approximately $181.2 million, respectively. Revenues, income and net assets generated by 100 First LLC and 303 Second LLC may only be used to settle their contractual obligations, which primarily consist of operating expenses, capital expenditures and required distributions. At December 31, 2021, the consolidated financial statements of the Company included two VIEs in addition to the Operating Partnership: 100 First LLC and 303 Second LLC. At December 31, 2021, the Company and the Operating Partnership were determined to be the primary beneficiaries of these two VIEs since we had the ability to control the activities that most significantly impact each of the VIEs’ economic performance. At December 31, 2021, the impact of consolidating the VIEs increased the Company’s total assets, liabilities and noncontrolling interests on our consolidated balance sheet by approximately $462.3 million (of which $377.9 million related to real estate held for investment), approximately $28.1 million and approximately $190.7 million, respectively.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions Development Project Acquisitions During the six months ended June 30, 2022, we acquired the following development site from an unrelated third party. Property Date of Acquisition Submarket Purchase Price (in millions) (1) 10615 Burnet Road, Austin, TX March 9, 2022 Stadium District / Domain $ 40.0 ________________________

Secured and Unsecured Debt of t

Secured and Unsecured Debt of the Operating Partnership	6 Months Ended
	Jun. 30, 2022
Kilroy Realty L.P.
Debt Instrument [Line Items]
Secured and Unsecured Debt of the Operating Partnership	Secured and Unsecured Debt of the Operating Partnership The Company generally guarantees all of the Operating Partnership’s unsecured debt obligations including the unsecured revolving credit facility and all of the unsecured senior notes. Unsecured Revolving Credit Facility The following table summarizes the balance and terms of our unsecured revolving credit facility as of June 30, 2022 and December 31, 2021: June 30, 2022 December 31, 2021 (in thousands) Outstanding borrowings $ — $ — Remaining borrowing capacity 1,100,000 1,100,000 Total borrowing capacity (1) $ 1,100,000 $ 1,100,000 Interest rate (2) 2.69 % 1.00 % Facility fee-annual rate (3) 0.200% Maturity date July 2025 ________________________ (1) We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $500.0 million under an accordion feature under the terms of the unsecured revolving credit facility. (2) Our unsecured revolving credit facility interest rate was calculated based on the contractual rate of LIBOR plus 0.900% as of June 30, 2022 and December 31, 2021. (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, 2022 and December 31, 2021, $6.3 million and $7.3 million of unamortized deferred financing costs, respectively, which are included in prepaid expenses and other assets, net on our consolidated balance sheets, remained to be amortized through the respective maturity dates presented of our unsecured revolving credit facility. The Company intends to borrow under the unsecured revolving credit facility from time to time for general corporate purposes, to finance development and redevelopment expenditures, to fund potential acquisitions and to potentially repay long-term debt and to supplement cash balances given uncertainties and volatility in market conditions. Debt Covenants and Restrictions The unsecured revolving credit facility, the unsecured senior notes, including the private placement 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, 2022. Debt Maturities The following table summarizes the stated debt maturities and scheduled amortization payments for all outstanding debt as of June 30, 2022: Year (in thousands) Remaining 2022 $ 2,805 2023 5,775 2024 431,006 2025 406,246 2026 401,317 2027 249,125 Thereafter 2,600,000 Total aggregate principal value (1) $ 4,096,274 ________________________ (1) Includes gross principal balance of outstanding debt before the effect of the following at June 30, 2022: $21.2 million of unamortized deferred financing costs for the unsecured senior notes and secured debt and $6.9 million of unamortized discounts for the unsecured senior notes. Capitalized Interest and Loan Fees The following table sets forth gross interest expense, including debt discount and deferred financing cost amortization, net of capitalized interest, for the three and six months ended June 30, 2022 and 2021. 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, 2022 2021 2022 2021 (in thousands) Gross interest expense $ 39,612 $ 39,463 $ 79,336 $ 78,705 Capitalized interest and deferred financing costs (19,491) (18,073) (38,590) (34,981) Interest expense $ 20,121 $ 21,390 $ 40,746 $ 43,724

Stockholders' Equity of the Com

Stockholders' Equity of the Company	6 Months Ended
	Jun. 30, 2022
Equity [Abstract]
Stockholders' Equity of the Company	Stockholders’ Equity of the Company At-The-Market Stock Offering Program Under our at-the-market stock offering program, which commenced in June 2018, we may offer and sell shares of our common stock having an aggregate gross sales price up to $500.0 million from time to time in “at-the-market” offerings. In connection with our at-the-market program, the Company may enter into forward equity sale agreements with certain financial institutions acting as forward purchasers whereby, at our discretion, the forward purchasers may borrow and sell shares of our common stock under our at-the-market program. The use of a forward equity sale agreement allows the Company to lock in a share price on the sale of shares of our common stock at the time the agreement is executed but defer settling the forward equity sale agreements and receiving the proceeds from the sale of shares until a later date. The Company did not have any outstanding forward equity sale agreements to be settled at June 30, 2022. Since commencement of our current at-the-market program, we have completed sales of 3,594,576 shares of common stock through June 30, 2022. As of June 30, 2022, we may offer and sell shares of our common stock having an aggregate gross sales price up to approximately $214.2 million under our current at-the-market program. The Company did not complete any sales of common stock under the program during the six months ended June 30, 2022.

Noncontrolling Interests on the

Noncontrolling Interests on the Company's Consolidated Financial Statements	6 Months Ended
	Jun. 30, 2022
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 99.0% common general partnership interest in the Operating Partnership as of June 30, 2022, December 31, 2021 and June 30, 2021. The remaining approximate 1.0% common limited partnership interest as of June 30, 2022, December 31, 2021 and June 30, 2021 was owned by non-affiliated investors and certain of our executive officers and directors in the form of noncontrolling common units. There were 1,150,574 common units outstanding held by these investors, executive officers and directors as of June 30, 2022, December 31, 2021 and June 30, 2021. 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 $60.1 million and $76.2 million as of June 30, 2022 and December 31, 2021, 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.

Partners' Capital of the Operat

Partners' Capital of the Operating Partnership	6 Months Ended
	Jun. 30, 2022
Partners' Capital Notes [Abstract]
Partners’ Capital 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 as the general partner and the number of common units held by non-affiliated investors and certain of our executive officers and directors in the form of common limited partner units as well as the ownership interest held on each respective date: June 30, 2022 December 31, 2021 June 30, 2021 Company owned common units in the Operating Partnership 116,870,970 116,464,169 116,454,210 Company owned general partnership interest 99.0 % 99.0 % 99.0 % Non-affiliated investors and other common units of the Operating Partnership 1,150,574 1,150,574 1,150,574 Ownership interest of limited partnership interests 1.0 % 1.0 % 1.0 % For further discussion of the redemption features of the common units not owned by the Company as of June 30, 2022 and December 31, 2021, refer to Note 5 “Noncontrolling Interests on the Company’s Consolidated Financial Statements.”

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation Stockholder Approved Share-Based Incentive Compensation Plan As of June 30, 2022, we maintained one share-based incentive compensation plan, the Kilroy Realty 2006 Incentive Award Plan, as amended (the “2006 Plan”). The Company has a currently effective registration statement registering 10.7 million shares of our common stock for possible issuance under our 2006 Plan. As of June 30, 2022, approximately 1.1 million shares were available for grant under the 2006 Plan. The calculation of shares available for grant is presented after taking into account a reserve for a sufficient number of shares to cover the vesting and payment of 2006 Plan awards that were outstanding on that date, including performance-based vesting awards at (i) levels actually achieved for the performance conditions (as defined below) for which the performance period has been completed and (ii) at maximum levels for the other performance and market conditions (as defined below) for awards still in a performance period. 2022 Share-Based Compensation Grants In January 2022, the Executive Compensation Committee of the Company’s Board of Directors awarded 351,281 restricted stock units (“RSUs”) to certain officers of the Company under the 2006 Plan, which included 193,111 RSUs (at the target level of performance) that are subject to market and/or performance-based vesting requirements (the “2022 Performance-Based RSUs”) and 158,170 RSUs that are subject to time-based vesting requirements (the “2022 Time-Based RSUs”). 2022 Performance-Based RSU Grant The 2022 Performance-Based RSUs are scheduled to vest at the end of a three year period (consisting of calendar years 2022-2024). A target number of 2022 Performance-Based RSUs were awarded, and the final number of 2022 Performance-Based RSUs that vest (which may be more or less than the target number) will be based upon (1) during the first calendar year of the three year performance measurement period, the achievement of pre-set FFO per share goals that applies to 100% of the Performance-Based RSUs awarded (the “FFO Performance Condition”) and (2) a performance measure that applies to 50% of the award based upon a measure of the Company’s average debt to EBITDA ratio for the three year performance period (the “Debt to EBITDA Ratio Performance Condition”) and a market measure that applies to the other 50% of the award based upon the relative ranking of the Company’s total stockholder return for the three year performance period compared to the total stockholder returns of an established comparison group of companies over the same period (the “Market Condition”). The 2022 Performance-Based RSUs are also subject to a three year service vesting provision (the “service vesting condition”) and are scheduled to cliff vest on the date the final vesting percentage is determined following the end of the three year performance period under the awards. The number of 2022 Performance-Based RSUs ultimately earned could fluctuate from the target number of 2022 Performance-Based RSUs granted based upon the levels of achievement for the FFO Performance Condition, the Debt to EBITDA Ratio Performance Condition, the Market Condition, and the extent to which the service vesting condition is satisfied. The estimate of the number of 2022 Performance-Based RSUs earned is evaluated quarterly during the performance period based on our estimate for each of the performance conditions measured against the applicable goals. During the six months ended June 30, 2022, we recognized $3.5 million of compensation expense for the 2022 Performance-Based RSU grant, respectively. In the event we achieve a lower level of performance or fail to meet the FFO performance condition, we would reverse a portion or all of the $3.5 million of compensation expense. Compensation expense for the 2022 Performance-Based RSU grant is recognized on a straight-line basis over the requisite service period for each participant, which is generally the three year service period, except for one participant whose compensation expense is recognized on an accelerated basis, due to clauses that render a portion of the vesting conditions to be non-substantive. Each 2022 Performance-Based RSU represents the right to receive one share of our common stock in the future, subject to, and as modified by the Company’s level of achievement of the FFO Performance, the Debt to EBITDA Ratio Performance Condition and the Market Condition. The fair value of the award was calculated using a Monte Carlo simulation pricing model based on the assumptions in the table below, which resulted in the following grant date fair value per share. Fair Value Assumptions Valuation date January 28, 2022 Fair value on valuation date (in millions) $12.7 Fair value per share on valuation date (1) $67.62 Expected share price volatility 36.0% Risk-free interest rate 1.35% ________________________ (1) For one participant, the fair value per share on the valuation date for their 2022 Performance-Based RSUs is $70.00. The computation of expected volatility was based on a blend of the historical volatility of our shares of common stock over a period of twice the remaining performance period as of the grant date and implied volatility data based on the observed pricing of six month publicly-traded options on shares of our common stock. The risk-free interest rate was based on the yield curve on zero-coupon U.S. Treasury STRIP securities in effect at January 28, 2022. For the three and six months ended June 30, 2022, we recorded compensation expense based upon the grant date fair value per share for each component multiplied by the estimated number of RSUs to be earned. 2022 Time-Based RSU Grant The 2022 Time-Based RSUs are scheduled to vest in three equal annual installments beginning on January 5, 2023 through January 5, 2025. Compensation expense for the 2022 Time-Based RSUs is recognized on a straight-line basis over the requisite service period, which is generally the explicit service period except for one participant whose compensation expense is recognized on an accelerated basis, due to clauses that render a portion of the vesting conditions to be non-substantive. Each 2022 Time-Based RSU represents the right to receive one share of our common stock in the future, subject to continued employment through the applicable vesting date, unless accelerated upon separation of employment, provided certain conditions are met. The total grant date fair value of the 2022 Time-Based RSU awards was $10.0 million, which was based on the $63.05 closing share price of the Company’s common stock on the NYSE on the January 28, 2022 grant date. 2021 and 2020 Performance-Based RSUs Compensation cost for the 2021 performance-based RSUs for the three and six months ended June 30, 2022 assumes the 2021 debt to EBITDA ratio performance condition is met at 125% of the target level of achievement (137.5% for one participant). Compensation cost for the 2020 performance-based RSUs for the three and six months ended June 30, 2022 assumes the 2020 debt to EBITDA ratio performance condition is met at 150% of the target level of achievement (175.0% for one participant). Share-Based Compensation Cost Recorded During the Period The total compensation cost for all share-based compensation programs was $9.7 million and $11.2 million for the three months ended June 30, 2022 and 2021, respectively, and $16.3 million and $20.8 million for the six months ended June 30, 2022 and 2021, respectively. Of the total share-based compensation costs, $1.7 million and $3.0 million was capitalized as part of the real estate assets for the three and six months ended June 30, 2022, respectively, and $1.7 million and $3.4 million was capitalized as part of the real estate assets for the three and six months ended June 30, 2021, respectively. As of June 30, 2022, there was approximately $36.5 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 1.9 years. The remaining compensation cost related to these nonvested incentive awards had been recognized in periods prior to June 30, 2022.

Rental Income and Future Minimu

Rental Income and Future Minimum Rent	6 Months Ended
	Jun. 30, 2022
Leases [Abstract]
Rental Income and Future Minimum Rent	Rental Income and Future Minimum Rent Our rental income is primarily comprised of payments defined under leases and are subject to scheduled fixed increases. Additionally, rental income includes variable payments for tenant reimbursements of property-related expenses and payments based on a percentage of tenant’s sales. The table below sets forth the allocation of rental income between fixed and variable payments and collectability recoveries (reversals) for the three and six months ended June 30, 2022 and 2021: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in thousands) Fixed lease payments $ 229,233 $ 197,846 $ 454,050 $ 402,062 Variable lease payments 39,141 26,339 76,221 57,814 Net collectability recoveries (reversals) (1) 202 288 1,513 (747) Total rental income $ 268,576 $ 224,473 $ 531,784 $ 459,129 _____________________ (1) Represents adjustments to rental income related to our assessment of the collectability of amounts due under leases with our tenants, including recognition of deferred rent balances associated with tenants restored from a cash basis of revenue recognition to an accrual basis of revenue recognition and allowances for uncollectible receivables and leases deemed not probable of collection. We have operating leases with tenants that expire at various dates through 2044 and are subject to scheduled fixed increases. Generally, the leases grant tenants renewal options. Leases also provide for additional rents based on certain operating expenses. Future contractual minimum rent under operating leases, which includes amounts contractually due from leases that are on a cash basis of reporting due to creditworthiness considerations, as of June 30, 2022 for future periods is summarized as follows: Year Ending (in thousands) Remaining 2022 $ 403,756 2023 819,141 2024 790,095 2025 752,423 2026 699,122 2027 637,723 Thereafter 2,331,027 Total (1) $ 6,433,287 _____________________ (1) Excludes residential leases and leases with a term of one year or less.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies General As of June 30, 2022, we had commitments of approximately $699.1 million, excluding our ground lease commitments, for contracts and executed leases directly related to our operating, development and redevelopment properties. Environmental Matters We follow the policy of evaluating all of our properties, including acquisition, development, redevelopment 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 undisclosed 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, 2022, we had accrued environmental remediation liabilities of approximately $70.3 million recorded on our consolidated balance sheets in connection with certain of our in-process and future development projects. The accrued environmental remediation liabilities represent the remaining costs we estimate we will incur prior to and during the development process at various development acquisition sites. These estimates, which we developed with the assistance of third party experts, consist primarily of the removal of contaminated soil, treatment of contaminated groundwater in connection with dewatering efforts, performing environmental closure activities, constructing remedial systems and other related costs that are necessary when we develop new buildings at these sites. We record estimated environmental remediation obligations for acquired properties at the acquisition date when we are aware of such costs and when such costs are probable of being incurred and can be reasonably estimated. Estimated costs related to development environmental remediation liabilities are recorded as an increase to the cost of the development project. Actual costs are recorded as a decrease to the liability when incurred. These accruals are adjusted as an increase or decrease to the development project costs and as an increase or decrease to the accrued environmental remediation liability if we obtain further information or circumstances change. The environmental remediation obligations recorded at June 30, 2022 were not discounted to their present values since the amount and timing of cash payments are not fixed. It is possible that we could incur additional environmental remediation costs in connection with these development projects. However, potential additional environmental costs for these development projects cannot be reasonably estimated at this time and certain changes in estimates could occur as the site conditions, final project timing, design elements, actual soil conditions and other aspects of the projects, which may depend upon municipal and other approvals beyond the control of the Company, are determined. Other than the accrued environmental liabilities discussed above, we are not aware of any unasserted claims and assessments with respect to an environmental liability that we believe would require additional disclosure or the recording of an additional loss contingency.

Fair Value Measurements and Dis

Fair Value Measurements and Disclosures	6 Months Ended
	Jun. 30, 2022
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, 2022 and December 31, 2021: Fair Value (Level 1) (1) June 30, 2022 December 31, 2021 Description (in thousands) Marketable securities (2) $ 22,988 $ 27,475 ________________________ (1) Based on quoted prices in active markets for identical securities. (2) The marketable securities are held in a limited rabbi trust. 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, 2022 and December 31, 2021: June 30, 2022 December 31, 2021 Carrying Fair (1) Carrying Fair (1) (in thousands) Liabilities Secured debt, net $ 245,680 $ 245,573 $ 248,367 $ 269,687 Unsecured debt, net $ 3,822,482 $ 3,753,272 $ 3,820,383 $ 4,105,408 ________________________ (1) Fair value calculated using Level 2 inputs, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.

Net Income Available to Common

Net Income Available to Common Stockholders Per Share of the Company	6 Months Ended
	Jun. 30, 2022
Earnings Per Share [Abstract]
Net Income 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, 2022 and 2021: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in thousands, except share and per share amounts) Numerator: Net income available to common stockholders $ 47,105 $ 35,839 $ 100,233 $ 533,470 Allocation to participating securities (1) (280) (371) (693) (736) Numerator for basic and diluted net income available to common stockholders $ 46,825 $ 35,468 $ 99,540 $ 532,734 Denominator: Basic weighted average vested shares outstanding 116,822,234 116,451,931 116,736,706 116,398,450 Effect of dilutive securities 362,704 465,532 386,155 461,295 Diluted weighted average vested shares and common stock equivalents outstanding 117,184,938 116,917,463 117,122,861 116,859,745 Basic earnings per share: Net income available to common stockholders per share $ 0.40 $ 0.30 $ 0.85 $ 4.58 Diluted earnings per share: Net income available to common stockholders per share $ 0.40 $ 0.30 $ 0.85 $ 4.56 ________________________ (1) Participating securities include certain time-based RSUs and vested market measure-based RSUs. 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 and RSUs are considered in our diluted earnings per share calculation for the three and six months ended June 30, 2022 and 2021. Certain market measure-based RSUs are not included in dilutive securities for the three and six months ended June 30, 2022 and 2021, as not all performance metrics had been met by the end of the applicable reporting periods. See Note 7 “Share-Based Compensation” for additional information regarding share-based compensation.

Net Income Available to Commo_2

Net Income Available to Common Unitholders Per Unit of the Operating Partnership	6 Months Ended
	Jun. 30, 2022
Net Income Available To Common Unitholders [Line Items]
Net Income Available to Common Unitholders Per Unit of the Operating Partnership	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, 2022 and 2021: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in thousands, except share and per share amounts) Numerator: Net income available to common stockholders $ 47,105 $ 35,839 $ 100,233 $ 533,470 Allocation to participating securities (1) (280) (371) (693) (736) Numerator for basic and diluted net income available to common stockholders $ 46,825 $ 35,468 $ 99,540 $ 532,734 Denominator: Basic weighted average vested shares outstanding 116,822,234 116,451,931 116,736,706 116,398,450 Effect of dilutive securities 362,704 465,532 386,155 461,295 Diluted weighted average vested shares and common stock equivalents outstanding 117,184,938 116,917,463 117,122,861 116,859,745 Basic earnings per share: Net income available to common stockholders per share $ 0.40 $ 0.30 $ 0.85 $ 4.58 Diluted earnings per share: Net income available to common stockholders per share $ 0.40 $ 0.30 $ 0.85 $ 4.56 ________________________ (1) Participating securities include certain time-based RSUs and vested market measure-based RSUs. 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 and RSUs are considered in our diluted earnings per share calculation for the three and six months ended June 30, 2022 and 2021. Certain market measure-based RSUs are not included in dilutive securities for the three and six months ended June 30, 2022 and 2021, as not all performance metrics had been met by the end of the applicable reporting periods. See Note 7 “Share-Based Compensation” for additional information regarding share-based compensation.
Kilroy Realty L.P.
Net Income Available To Common Unitholders [Line Items]
Net Income 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, 2022 and 2021: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in thousands, except unit and per unit amounts) Numerator: Net income available to common unitholders $ 47,620 $ 36,193 $ 101,264 $ 538,710 Allocation to participating securities (1) (280) (371) (693) (736) Numerator for basic and diluted net income available to common unitholders $ 47,340 $ 35,822 $ 100,571 $ 537,974 Denominator: Basic weighted average vested units outstanding 117,972,808 117,602,505 117,887,280 117,549,024 Effect of dilutive securities 362,704 465,532 386,155 461,295 Diluted weighted average vested units and common unit equivalents outstanding 118,335,512 118,068,037 118,273,435 118,010,319 Basic earnings per unit: Net income available to common unitholders per unit $ 0.40 $ 0.30 $ 0.85 $ 4.58 Diluted earnings per unit: Net income available to common unitholders per unit $ 0.40 $ 0.30 $ 0.85 $ 4.56 ________________________ (1) Participating securities include certain time-based RSUs and vested market measure-based RSUs. 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 and RSU are considered in our diluted earnings per share calculation for the three and six months ended June 30, 2022 and 2021. Certain market measure-based RSUs are not included in dilutive securities for the three and six months ended June 30, 2022 and 2021, as not all performance metrics had been met by the end of the applicable reporting periods. See Note 7 “Share-Based Compensation” for additional information regarding share-based compensation.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information of the Company	6 Months Ended
	Jun. 30, 2022
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information of the Company	Supplemental Cash Flow Information of the Company Supplemental cash flow information follows (in thousands): Six Months Ended June 30, 2022 2021 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $36,476 and $33,244 as of June 30, 2022 and 2021, respectively $ 39,703 $ 41,520 Cash paid for amounts included in the measurement of ground lease liabilities $ 3,253 $ 2,887 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 62,443 $ 85,490 Tenant improvements funded directly by tenants $ 7,210 $ 4,265 Assumption of accrued liabilities in connection with acquisitions $ — $ 37,572 Initial measurement of operating right of use ground lease assets $ — $ 46,430 Initial measurement of operating ground lease liabilities $ — $ 46,430 NON-CASH FINANCING TRANSACTIONS: Accrual of dividends and distributions payable to common stockholders and common unitholders $ 61,880 $ 59,455 The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the six months ended June 30, 2022 and 2021. Six Months Ended June 30, 2022 2021 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 414,077 $ 731,991 Restricted cash at beginning of period 13,006 91,139 Cash and cash equivalents and restricted cash at beginning of period $ 427,083 $ 823,130 Cash and cash equivalents at end of period $ 210,044 $ 519,307 Restricted cash at end of period 13,008 450,457 Cash and cash equivalents and restricted cash at end of period $ 223,052 $ 969,764

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information of the Operating Partnership	6 Months Ended
	Jun. 30, 2022
Other Significant Noncash Transactions [Line Items]
Supplemental Cash Flow Information of the Operating Partnership	Supplemental Cash Flow Information of the Company Supplemental cash flow information follows (in thousands): Six Months Ended June 30, 2022 2021 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $36,476 and $33,244 as of June 30, 2022 and 2021, respectively $ 39,703 $ 41,520 Cash paid for amounts included in the measurement of ground lease liabilities $ 3,253 $ 2,887 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 62,443 $ 85,490 Tenant improvements funded directly by tenants $ 7,210 $ 4,265 Assumption of accrued liabilities in connection with acquisitions $ — $ 37,572 Initial measurement of operating right of use ground lease assets $ — $ 46,430 Initial measurement of operating ground lease liabilities $ — $ 46,430 NON-CASH FINANCING TRANSACTIONS: Accrual of dividends and distributions payable to common stockholders and common unitholders $ 61,880 $ 59,455 The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the six months ended June 30, 2022 and 2021. Six Months Ended June 30, 2022 2021 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 414,077 $ 731,991 Restricted cash at beginning of period 13,006 91,139 Cash and cash equivalents and restricted cash at beginning of period $ 427,083 $ 823,130 Cash and cash equivalents at end of period $ 210,044 $ 519,307 Restricted cash at end of period 13,008 450,457 Cash and cash equivalents and restricted cash at end of period $ 223,052 $ 969,764
Kilroy Realty L.P.
Other Significant Noncash Transactions [Line Items]
Supplemental Cash Flow Information of the Operating Partnership	Supplemental Cash Flow Information of the Operating Partnership: Supplemental cash flow information follows (in thousands): Six Months Ended June 30, 2022 2021 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $36,476 and $33,244 as of June 30, 2022 and 2021, respectively $ 39,703 $ 41,520 Cash paid for amounts included in the measurement of ground lease liabilities $ 3,253 $ 2,887 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 62,443 $ 85,490 Tenant improvements funded directly by tenants $ 7,210 $ 4,265 Assumption of accrued liabilities in connection with acquisitions $ — $ 37,572 Initial measurement of operating right of use ground lease assets $ — $ 46,430 Initial measurement of operating ground lease liabilities $ — $ 46,430 NON-CASH FINANCING TRANSACTIONS: Accrual of distributions payable to common unitholders (Note 15) $ 61,880 $ 59,455 The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the six months ended June 30, 2022 and 2021. Six Months Ended June 30, 2022 2021 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 414,077 $ 731,991 Restricted cash at beginning of period 13,006 91,139 Cash and cash equivalents and restricted cash at beginning of period $ 427,083 $ 823,130 Cash and cash equivalents at end of period $ 210,044 $ 519,307 Restricted cash at end of period 13,008 450,457 Cash and cash equivalents and restricted cash at end of period $ 223,052 $ 969,764

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2022
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 13, 2022, aggregate dividends, distributions and dividend equivalents of $61.9 million were paid to common stockholders, common unitholders and RSU holders of record on June 30, 2022.

Organization, Ownership and B_2

Organization, Ownership and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2022
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, 303 Second LLC, 100 First LLC, 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, 303 Second LLC, 100 First LLC, Redwood LLC and all of our wholly-owned and controlled subsidiaries. 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, 2022. 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, 2021.

Organization, Ownership and B_3

Organization, Ownership and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of real estate properties	Our stabilized portfolio of operating properties was comprised of the following properties at June 30, 2022: Number of Rentable Number of Percentage Occupied (1) Percentage Leased Stabilized Office Properties (2) 118 15,808,559 414 91.4 % 93.7 % ________________________ (1) Represents economic occupancy. (2) Includes stabilized life science and retail space. Number of Number of 2022 Average Occupancy Stabilized Residential Properties 3 1,001 93.7 % Number of Estimated Rentable Square Feet (1) In-process development projects - tenant improvement 2 969,000 In-process development projects - under construction 2 946,000 In-process redevelopment projects - under construction 3 344,000 ________________________ (1) Estimated rentable square feet upon completion.

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2022
Business Combination and Asset Acquisition [Abstract]
Schedule of acquisitions	During the six months ended June 30, 2022, we acquired the following development site from an unrelated third party. Property Date of Acquisition Submarket Purchase Price (in millions) (1) 10615 Burnet Road, Austin, TX March 9, 2022 Stadium District / Domain $ 40.0 ________________________

Secured and Unsecured Debt of_2

Secured and Unsecured Debt of the Operating Partnership (Tables) - Kilroy Realty L.P.	6 Months Ended
	Jun. 30, 2022
Debt Instrument [Line Items]
Schedule of Unsecured Revolving Credit Facility	The following table summarizes the balance and terms of our unsecured revolving credit facility as of June 30, 2022 and December 31, 2021: June 30, 2022 December 31, 2021 (in thousands) Outstanding borrowings $ — $ — Remaining borrowing capacity 1,100,000 1,100,000 Total borrowing capacity (1) $ 1,100,000 $ 1,100,000 Interest rate (2) 2.69 % 1.00 % Facility fee-annual rate (3) 0.200% Maturity date July 2025 ________________________ (1) We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $500.0 million under an accordion feature under the terms of the unsecured revolving credit facility. (2) Our unsecured revolving credit facility interest rate was calculated based on the contractual rate of LIBOR plus 0.900% as of June 30, 2022 and December 31, 2021. (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, 2022 and December 31, 2021, $6.3 million and $7.3 million of unamortized deferred financing costs, respectively, which are included in prepaid expenses and other assets, net on our consolidated balance sheets, remained to be amortized through the respective maturity dates presented of our unsecured revolving credit facility.
Schedule of Debt Maturities	The following table summarizes the stated debt maturities and scheduled amortization payments for all outstanding debt as of June 30, 2022: Year (in thousands) Remaining 2022 $ 2,805 2023 5,775 2024 431,006 2025 406,246 2026 401,317 2027 249,125 Thereafter 2,600,000 Total aggregate principal value (1) $ 4,096,274 ________________________
Schedule of Capitalized Interest and Loan Fees	The following table sets forth gross interest expense, including debt discount and deferred financing cost amortization, net of capitalized interest, for the three and six months ended June 30, 2022 and 2021. 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, 2022 2021 2022 2021 (in thousands) Gross interest expense $ 39,612 $ 39,463 $ 79,336 $ 78,705 Capitalized interest and deferred financing costs (19,491) (18,073) (38,590) (34,981) Interest expense $ 20,121 $ 21,390 $ 40,746 $ 43,724

Partners' Capital of the Oper_2

Partners' Capital of the Operating Partnership (Tables)	6 Months Ended
	Jun. 30, 2022
Partners' Capital Notes [Abstract]
Schedule of Redeemable Noncontrolling Interest	The following table sets forth the number of common units held by the Company as the general partner and the number of common units held by non-affiliated investors and certain of our executive officers and directors in the form of common limited partner units as well as the ownership interest held on each respective date: June 30, 2022 December 31, 2021 June 30, 2021 Company owned common units in the Operating Partnership 116,870,970 116,464,169 116,454,210 Company owned general partnership interest 99.0 % 99.0 % 99.0 % Non-affiliated investors and other common units of the Operating Partnership 1,150,574 1,150,574 1,150,574 Ownership interest of limited partnership interests 1.0 % 1.0 % 1.0 %

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]
Schedule of share-based payment award, restricted stock units, valuation assumptions	The fair value of the award was calculated using a Monte Carlo simulation pricing model based on the assumptions in the table below, which resulted in the following grant date fair value per share. Fair Value Assumptions Valuation date January 28, 2022 Fair value on valuation date (in millions) $12.7 Fair value per share on valuation date (1) $67.62 Expected share price volatility 36.0% Risk-free interest rate 1.35% ________________________ (1) For one participant, the fair value per share on the valuation date for their 2022 Performance-Based RSUs is $70.00.

Rental Income and Future Mini_2

Rental Income and Future Minimum Rent (Tables)	6 Months Ended
	Jun. 30, 2022
Leases [Abstract]
Schedule of Rental Income	The table below sets forth the allocation of rental income between fixed and variable payments and collectability recoveries (reversals) for the three and six months ended June 30, 2022 and 2021: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in thousands) Fixed lease payments $ 229,233 $ 197,846 $ 454,050 $ 402,062 Variable lease payments 39,141 26,339 76,221 57,814 Net collectability recoveries (reversals) (1) 202 288 1,513 (747) Total rental income $ 268,576 $ 224,473 $ 531,784 $ 459,129 _____________________
Future Contractual Minimum Rent Under Operating Lease	Future contractual minimum rent under operating leases, which includes amounts contractually due from leases that are on a cash basis of reporting due to creditworthiness considerations, as of June 30, 2022 for future periods is summarized as follows: Year Ending (in thousands) Remaining 2022 $ 403,756 2023 819,141 2024 790,095 2025 752,423 2026 699,122 2027 637,723 Thereafter 2,331,027 Total (1) $ 6,433,287 _____________________ (1) Excludes residential leases and leases with a term of one year or less.

Fair Value Measurements and D_2

Fair Value Measurements and Disclosures (Tables)	6 Months Ended
	Jun. 30, 2022
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, 2022 and December 31, 2021: Fair Value (Level 1) (1) June 30, 2022 December 31, 2021 Description (in thousands) Marketable securities (2) $ 22,988 $ 27,475 ________________________ (1) Based on quoted prices in active markets for identical securities. (2) The marketable securities are held in a limited rabbi trust.
Carrying Value and Fair Value of Other Financial Instruments	The following table sets forth the carrying value and the fair value of our other financial instruments as of June 30, 2022 and December 31, 2021: June 30, 2022 December 31, 2021 Carrying Fair (1) Carrying Fair (1) (in thousands) Liabilities Secured debt, net $ 245,680 $ 245,573 $ 248,367 $ 269,687 Unsecured debt, net $ 3,822,482 $ 3,753,272 $ 3,820,383 $ 4,105,408 ________________________ (1) Fair value calculated using Level 2 inputs, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.

Net Income Available to Commo_3

Net Income Available to Common Stockholders Per Share of the Company (Tables)	6 Months Ended
	Jun. 30, 2022
Earnings Per Share [Abstract]
Net Income 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, 2022 and 2021: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in thousands, except share and per share amounts) Numerator: Net income available to common stockholders $ 47,105 $ 35,839 $ 100,233 $ 533,470 Allocation to participating securities (1) (280) (371) (693) (736) Numerator for basic and diluted net income available to common stockholders $ 46,825 $ 35,468 $ 99,540 $ 532,734 Denominator: Basic weighted average vested shares outstanding 116,822,234 116,451,931 116,736,706 116,398,450 Effect of dilutive securities 362,704 465,532 386,155 461,295 Diluted weighted average vested shares and common stock equivalents outstanding 117,184,938 116,917,463 117,122,861 116,859,745 Basic earnings per share: Net income available to common stockholders per share $ 0.40 $ 0.30 $ 0.85 $ 4.58 Diluted earnings per share: Net income available to common stockholders per share $ 0.40 $ 0.30 $ 0.85 $ 4.56 ________________________

Net Income Available to Commo_4

Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Tables)	6 Months Ended
	Jun. 30, 2022
Net Income Available To Common Unitholders [Line Items]
Net Income 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, 2022 and 2021: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in thousands, except share and per share amounts) Numerator: Net income available to common stockholders $ 47,105 $ 35,839 $ 100,233 $ 533,470 Allocation to participating securities (1) (280) (371) (693) (736) Numerator for basic and diluted net income available to common stockholders $ 46,825 $ 35,468 $ 99,540 $ 532,734 Denominator: Basic weighted average vested shares outstanding 116,822,234 116,451,931 116,736,706 116,398,450 Effect of dilutive securities 362,704 465,532 386,155 461,295 Diluted weighted average vested shares and common stock equivalents outstanding 117,184,938 116,917,463 117,122,861 116,859,745 Basic earnings per share: Net income available to common stockholders per share $ 0.40 $ 0.30 $ 0.85 $ 4.58 Diluted earnings per share: Net income available to common stockholders per share $ 0.40 $ 0.30 $ 0.85 $ 4.56 ________________________
Kilroy Realty L.P.
Net Income Available To Common Unitholders [Line Items]
Net Income Available to Common Stockholders	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, 2022 and 2021: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in thousands, except unit and per unit amounts) Numerator: Net income available to common unitholders $ 47,620 $ 36,193 $ 101,264 $ 538,710 Allocation to participating securities (1) (280) (371) (693) (736) Numerator for basic and diluted net income available to common unitholders $ 47,340 $ 35,822 $ 100,571 $ 537,974 Denominator: Basic weighted average vested units outstanding 117,972,808 117,602,505 117,887,280 117,549,024 Effect of dilutive securities 362,704 465,532 386,155 461,295 Diluted weighted average vested units and common unit equivalents outstanding 118,335,512 118,068,037 118,273,435 118,010,319 Basic earnings per unit: Net income available to common unitholders per unit $ 0.40 $ 0.30 $ 0.85 $ 4.58 Diluted earnings per unit: Net income available to common unitholders per unit $ 0.40 $ 0.30 $ 0.85 $ 4.56 ________________________

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information of the Company (Tables)	6 Months Ended
	Jun. 30, 2022
Supplemental Cash Flow Elements [Abstract]
Schedule of Supplemental Cash Flows	Supplemental cash flow information follows (in thousands): Six Months Ended June 30, 2022 2021 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $36,476 and $33,244 as of June 30, 2022 and 2021, respectively $ 39,703 $ 41,520 Cash paid for amounts included in the measurement of ground lease liabilities $ 3,253 $ 2,887 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 62,443 $ 85,490 Tenant improvements funded directly by tenants $ 7,210 $ 4,265 Assumption of accrued liabilities in connection with acquisitions $ — $ 37,572 Initial measurement of operating right of use ground lease assets $ — $ 46,430 Initial measurement of operating ground lease liabilities $ — $ 46,430 NON-CASH FINANCING TRANSACTIONS: Accrual of dividends and distributions payable to common stockholders and common unitholders $ 61,880 $ 59,455
Reconciliation of Cash and Cash Equivalents and Restricted Cash	The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the six months ended June 30, 2022 and 2021. Six Months Ended June 30, 2022 2021 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 414,077 $ 731,991 Restricted cash at beginning of period 13,006 91,139 Cash and cash equivalents and restricted cash at beginning of period $ 427,083 $ 823,130 Cash and cash equivalents at end of period $ 210,044 $ 519,307 Restricted cash at end of period 13,008 450,457 Cash and cash equivalents and restricted cash at end of period $ 223,052 $ 969,764
Reconciliation of Cash and Cash Equivalents and Restricted Cash	The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the six months ended June 30, 2022 and 2021. Six Months Ended June 30, 2022 2021 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 414,077 $ 731,991 Restricted cash at beginning of period 13,006 91,139 Cash and cash equivalents and restricted cash at beginning of period $ 427,083 $ 823,130 Cash and cash equivalents at end of period $ 210,044 $ 519,307 Restricted cash at end of period 13,008 450,457 Cash and cash equivalents and restricted cash at end of period $ 223,052 $ 969,764

Supplemental Cash Flow Inform_4

Supplemental Cash Flow Information of the Operating Partnership (Tables)	6 Months Ended
	Jun. 30, 2022
Other Significant Noncash Transactions [Line Items]
Schedule of Supplemental Cash Flows	Supplemental cash flow information follows (in thousands): Six Months Ended June 30, 2022 2021 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $36,476 and $33,244 as of June 30, 2022 and 2021, respectively $ 39,703 $ 41,520 Cash paid for amounts included in the measurement of ground lease liabilities $ 3,253 $ 2,887 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 62,443 $ 85,490 Tenant improvements funded directly by tenants $ 7,210 $ 4,265 Assumption of accrued liabilities in connection with acquisitions $ — $ 37,572 Initial measurement of operating right of use ground lease assets $ — $ 46,430 Initial measurement of operating ground lease liabilities $ — $ 46,430 NON-CASH FINANCING TRANSACTIONS: Accrual of dividends and distributions payable to common stockholders and common unitholders $ 61,880 $ 59,455
Reconciliation of Cash and Cash Equivalents and Restricted Cash	The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the six months ended June 30, 2022 and 2021. Six Months Ended June 30, 2022 2021 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 414,077 $ 731,991 Restricted cash at beginning of period 13,006 91,139 Cash and cash equivalents and restricted cash at beginning of period $ 427,083 $ 823,130 Cash and cash equivalents at end of period $ 210,044 $ 519,307 Restricted cash at end of period 13,008 450,457 Cash and cash equivalents and restricted cash at end of period $ 223,052 $ 969,764
Reconciliation of Cash and Cash Equivalents and Restricted Cash	The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the six months ended June 30, 2022 and 2021. Six Months Ended June 30, 2022 2021 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 414,077 $ 731,991 Restricted cash at beginning of period 13,006 91,139 Cash and cash equivalents and restricted cash at beginning of period $ 427,083 $ 823,130 Cash and cash equivalents at end of period $ 210,044 $ 519,307 Restricted cash at end of period 13,008 450,457 Cash and cash equivalents and restricted cash at end of period $ 223,052 $ 969,764
Kilroy Realty L.P.
Other Significant Noncash Transactions [Line Items]
Schedule of Supplemental Cash Flows	Supplemental cash flow information follows (in thousands): Six Months Ended June 30, 2022 2021 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $36,476 and $33,244 as of June 30, 2022 and 2021, respectively $ 39,703 $ 41,520 Cash paid for amounts included in the measurement of ground lease liabilities $ 3,253 $ 2,887 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 62,443 $ 85,490 Tenant improvements funded directly by tenants $ 7,210 $ 4,265 Assumption of accrued liabilities in connection with acquisitions $ — $ 37,572 Initial measurement of operating right of use ground lease assets $ — $ 46,430 Initial measurement of operating ground lease liabilities $ — $ 46,430 NON-CASH FINANCING TRANSACTIONS: Accrual of distributions payable to common unitholders (Note 15) $ 61,880 $ 59,455
Reconciliation of Cash and Cash Equivalents and Restricted Cash	The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the six months ended June 30, 2022 and 2021. Six Months Ended June 30, 2022 2021 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 414,077 $ 731,991 Restricted cash at beginning of period 13,006 91,139 Cash and cash equivalents and restricted cash at beginning of period $ 427,083 $ 823,130 Cash and cash equivalents at end of period $ 210,044 $ 519,307 Restricted cash at end of period 13,008 450,457 Cash and cash equivalents and restricted cash at end of period $ 223,052 $ 969,764
Reconciliation of Cash and Cash Equivalents and Restricted Cash	The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the six months ended June 30, 2022 and 2021. Six Months Ended June 30, 2022 2021 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 414,077 $ 731,991 Restricted cash at beginning of period 13,006 91,139 Cash and cash equivalents and restricted cash at beginning of period $ 427,083 $ 823,130 Cash and cash equivalents at end of period $ 210,044 $ 519,307 Restricted cash at end of period 13,008 450,457 Cash and cash equivalents and restricted cash at end of period $ 223,052 $ 969,764

Organization, Ownership and B_4

Organization, Ownership and Basis of Presentation - Operating Properties (Details)	6 Months Ended
	Jun. 30, 2022 ft² property project tenant
In-process development projects - tenant improvement
Real Estate Properties [Line Items]
Rentable Square Feet	969,000
Number of properties | project	2
In-process development projects - under construction
Real Estate Properties [Line Items]
Rentable Square Feet	946,000
Number of properties | project	2
In-process redevelopment projects - under construction
Real Estate Properties [Line Items]
Rentable Square Feet	344,000
Number of properties | project	3
Stabilized Office Properties
Real Estate Properties [Line Items]
Number of buildings | property	118
Rentable Square Feet	15,808,559
Number of Tenants | tenant	414
Percentage Occupied	91.40%
Percentage Leased	93.70%
Stabilized Residential Properties
Real Estate Properties [Line Items]
Number of properties | property	3
Number of Units | property	1,001
2022 Average Occupancy	93.70%

Organization, Ownership and B_5

Organization, Ownership and Basis of Presentation - Narrative (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) a ft² property_partnership building property development_site VIE	Jun. 30, 2021	Dec. 31, 2021 USD ($) VIE
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Lease-up properties occupancy percentage	95%
Lease-up properties occupancy duration	1 year
Assets	$ 10,515,241		$ 10,583,397
Liabilities	4,862,690		4,893,527
Noncontrolling interest in VIE	$ 186,368		$ 196,064
Variable Interest Entity, Primary Beneficiary
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of VIEs | VIE	3		2
Assets	$ 477,100		$ 462,300
Liabilities	25,400		28,100
Variable Interest Entity, Primary Beneficiary | Real Estate Investment
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Assets	$ 409,600		377,900
San Francisco, California
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of properties | building	1
101 First LLC and 303 Second LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Company owned general partnership interest	56%
101 First LLC and 303 Second LLC | Variable Interest Entity, Primary Beneficiary
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling interest in VIE	$ 181,200		$ 190,700
Redwood LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Company owned general partnership interest	93%
Redwood LLC | Redwood City, California
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of properties | property	2
Operating Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership interest (percent)	99%	99%	99%
Operating Partnership | Non-Affiliated Investors
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership interest (percent)	1%	1%	1%
Development sites
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of future development sites | development_site	8
Future Development Site
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Area of undeveloped land | a	64
Stabilized Office Properties
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings | property	118
Rentable square feet | ft²	15,808,559
Stabilized Office Properties | Washington
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings added during the period | property	1
Number of buildings | property	1
Rentable square feet | ft²	618,766
Number of properties | property	10
Development Project In The Tenant Improvement Phase | Texas
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of properties | development_site	1
Future Development Project | Washington
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of properties | development_site	1
Future Development Project | Texas
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of properties | development_site	1
Properties and development projects
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property ownership percentage	100%
Office properties owned by consolidated property partnerships
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of properties | property	4
Consolidated Property Partnerships
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of property partnerships | property_partnership	3
Consolidated Property Partnerships Owning Office Properties Through REITs | 101 First LLC and 303 Second LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of property partnerships | property_partnership	2

Acquisitions (Details)

Acquisitions (Details) $ in Millions	Mar. 09, 2022 USD ($)
10615 Burnet Road, Austin, TX
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Purchase price	$ 40

Secured and Unsecured Debt of_3

Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes, Unsecured Revolving Credit Facility and Term Loan Facility (Details) - Kilroy Realty L.P. - Revolving credit facility - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Terms of the Credit Facility
Outstanding borrowings	$ 0	$ 0
Remaining borrowing capacity	1,100,000,000	1,100,000,000
Total borrowing capacity	$ 1,100,000,000	$ 1,100,000,000
Interest rate (percent)	2.69%	1%
Facility fee-annual rate (percent)	0.20%	0.20%
Contingent additional borrowings	$ 500,000,000	$ 500,000,000
Unamortized deferred financing costs	$ 6,300,000	$ 7,300,000
London Interbank Offered Rate (LIBOR)
Terms of the Credit Facility
Variable rate (percent)	0.90%	0.90%

Secured and Unsecured Debt of_4

Secured and Unsecured Debt of the Operating Partnership - Debt Maturities (Details) - Kilroy Realty L.P. $ in Thousands	Jun. 30, 2022 USD ($)
Stated debt maturities and scheduled amortization payments
Remaining 2022	$ 2,805
2023	5,775
2024	431,006
2025	406,246
2026	401,317
2027	249,125
Thereafter	2,600,000
Total debt	4,096,274
Unsecured Term Loan Facility, Unsecured Senior Notes and Secured Debt
Stated debt maturities and scheduled amortization payments
Unamortized deferred financing costs	21,200
Senior Notes
Stated debt maturities and scheduled amortization payments
Unamortized discount	$ 6,900

Secured and Unsecured Debt of_5

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Capitalized Interest and Loan Fees [Line Items]
Interest expense	$ 20,121	$ 21,390	$ 40,746	$ 43,724
Kilroy Realty L.P.
Capitalized Interest and Loan Fees [Line Items]
Gross interest expense	39,612	39,463	79,336	78,705
Capitalized interest and deferred financing costs	(19,491)	(18,073)	(38,590)	(34,981)
Interest expense	$ 20,121	$ 21,390	$ 40,746	$ 43,724

Stockholders' Equity of the C_2

Stockholders' Equity of the Company (Details) - USD ($)	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2018
Class of Stock [Line Items]
Common stock, shares issued (in shares)	116,870,970	116,464,169
2018 At-The-Market Program
Class of Stock [Line Items]
At the market stock offering aggregate gross sales price of common stock			$ 500,000,000
Common Stock | Forward equity sale | 2018 At-The-Market Program
Class of Stock [Line Items]
Common stock, shares issued (in shares)	3,594,576
At the market stock offering remaining amount available for issuance	$ 214,200,000
Proceeds from issuance of stock	$ 0

Noncontrolling Interests on t_2

Noncontrolling Interests on the Company's Consolidated Financial Statements (Details) $ / shares in Units, $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) trading_day $ / shares shares	Jun. 30, 2021 shares	Dec. 31, 2021 USD ($) trading_day $ / shares shares
Noncontrolling Interest [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.01		$ 0.01
Number of trading days | trading_day	10		10
Aggregate value upon redemption of outstanding noncontrolling common units | $	$ 60.1		$ 76.2
Non-Affiliated Investors | Common Units
Noncontrolling Interest [Line Items]
Common units outstanding held by common limited partners (in shares)	1,150,574	1,150,574	1,150,574
Kilroy Realty L.P. | Common Units
Noncontrolling Interest [Line Items]
Conversion ratio	1
Kilroy Realty L.P. | Common Units
Noncontrolling Interest [Line Items]
Common units outstanding held by common limited partners (in shares)	1,150,574		1,150,574
Operating Partnership
Noncontrolling Interest [Line Items]
Ownership interest (percent)	99%	99%	99%
Operating Partnership | Non-Affiliated Investors
Noncontrolling Interest [Line Items]
Ownership interest (percent)	1%	1%	1%

Partners' Capital of the Oper_3

Partners' Capital of the Operating Partnership (Details) - shares	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Operating Partnership
General Partners' Capital Account [Abstract]
Company owned general partnership interest (percent)	99%	99%	99%
Kilroy Realty L.P. | Common Units
General Partners' Capital Account [Abstract]
Company owned common units in the Operating Partnership (in units)	116,870,970	116,454,210	116,464,169
Non-affiliated investors and other common units of the Operating Partnership (in units)	1,150,574		1,150,574
Non-Affiliated Investors | Operating Partnership
General Partners' Capital Account [Abstract]
Company owned general partnership interest (percent)	1%	1%	1%
Non-Affiliated Investors | Common Units
General Partners' Capital Account [Abstract]
Non-affiliated investors and other common units of the Operating Partnership (in units)	1,150,574	1,150,574	1,150,574

Share-Based Compensation - Narr

Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 28, 2022 USD ($) installment participant $ / shares shares	Jan. 31, 2022 participant shares	Jun. 30, 2022 USD ($) participant compensation_plan shares	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) participant compensation_plan shares	Jun. 30, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based incentive compensation plans | compensation_plan			1		1
Effective registration shares (in shares) | shares			10,700,000		10,700,000
Number of shares available for grant (in shares) | shares			1,100,000		1,100,000
Share-based compensation expense | $			$ 9.7	$ 11.2	$ 16.3	$ 20.8
Share-based compensation expense capitalized | $			1.7	$ 1.7	3	$ 3.4
Share-based compensation not yet recognized | $			$ 36.5		36.5
Share-based compensation not yet recognized period of recognition			1 year 10 months 24 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period (in shares) | shares		351,281
Market Measure-Based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period (in shares) | shares		193,111
Time-Based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period (in shares) | shares		158,170
2022 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Vesting, achievement of pre-set FFO per share goals, percentage of RSUs		100%
Vesting, Average debt to EBIDTA ratio, percentage of RSUs		50%
Vesting, Market measure, percentage of RSUs		50%
Share-based compensation expense | $					$ 3.5
Number of participants with compensation expense recognized on a rolling twelve-month basis | participant		1
Number of shares issuable per RSU		1
Fair value RSUs granted | $	$ 12.7
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of participants with compensation expense recognized on a rolling twelve-month basis | participant	1
Number of installments | installment	3
Right to receive number of shares (in shares) | shares	1
Time-Based Restricted Stock Units (RSUs), Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value RSUs granted | $	$ 10
Share price (in dollars per share) | $ / shares	$ 63.05
2021 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of participants with compensation expense recognized on a rolling twelve-month basis | participant			1		1
Performance-based RSU, achievement target, all other participants, percent			125%		125%
Performance-based RSU, achievement target, one participant, percent			137.50%		137.50%
2020 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of participants with compensation expense recognized on a rolling twelve-month basis | participant			1		1
Performance-based RSU, achievement target, all other participants, percent			150%		150%
Performance-based RSU, achievement target, one participant, percent			175%		175%

Share-Based Compensation - Fair

Share-Based Compensation - Fair Value Assumptions (Details) - 2022 Performance-Based RSUs $ / shares in Units, $ in Millions	Jan. 28, 2022 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value on valuation date | $	$ 12.7
Fair value per share on valuation date (in dollars per share)	$ 67.62
Expected share price volatility	36%
Risk-free interest rate	1.35%
One Participant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share on valuation date (in dollars per share)	$ 70

Rental Income and Future Mini_3

Rental Income and Future Minimum Rent - Rental income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Fixed lease payments	$ 229,233	$ 197,846	$ 454,050	$ 402,062
Variable lease payments	39,141	26,339	76,221	57,814
Net collectability recoveries (reversals)	202	288	1,513	(747)
Total rental income	$ 268,576	$ 224,473	$ 531,784	$ 459,129

Rental Income and Future Mini_4

Rental Income and Future Minimum Rent - Future Contractual Minimum Rent (Details) $ in Thousands	Jun. 30, 2022 USD ($)
Future contractual minimum rent under operating lease
Remaining 2022	$ 403,756
2023	819,141
2024	790,095
2025	752,423
2026	699,122
2027	637,723
Thereafter	2,331,027
Total	$ 6,433,287

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions	Jun. 30, 2022 USD ($)
Long-term Purchase Commitment [Line Items]
Commitments for contracts and executed leases directly related to operating and development properties	$ 699.1
Environmental matters
Long-term Purchase Commitment [Line Items]
Accrued environmental remediation liabilities	$ 70.3

Fair Value Measurements and D_3

Fair Value Measurements and Disclosures - Assets and Liabilities Reported at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair value, measurements, recurring | Fair Value (Level 1)
Assets and Liabilities Reported at Fair Value
Marketable securities	$ 22,988	$ 27,475

Fair Value Measurements and D_4

Fair Value Measurements and Disclosures - Financial Instruments Disclosed at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Carrying Value | Secured debt, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	$ 245,680	$ 248,367
Carrying Value | Unsecured debt, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	3,822,482	3,820,383
Fair Value | Secured debt, net | Fair value (level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	245,573	269,687
Fair Value | Unsecured debt, net | Fair value (level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	$ 3,753,272	$ 4,105,408

Net Income Available to Commo_5

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income available to common stockholders	$ 47,105	$ 35,839	$ 100,233	$ 533,470
Allocation to participating securities	(280)	(371)	(693)	(736)
Numerator for basic and diluted net income available to common stockholders	$ 46,825	$ 35,468	$ 99,540	$ 532,734
Denominator:
Basic weighted average vested shares outstanding (in shares)	116,822,234	116,451,931	116,736,706	116,398,450
Effect of dilutive securities (in shares)	362,704	465,532	386,155	461,295
Diluted weighted average vested shares and common stock equivalents outstanding (in shares)	117,184,938	116,917,463	117,122,861	116,859,745
Basic earnings per share:
Net income available to common stockholders per share (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.58
Diluted earnings per share:
Net income available to common stockholders per share (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.56

Net Income Available to Commo_6

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income available to common unitholders	$ 47,105	$ 35,839	$ 100,233	$ 533,470
Allocation to participating securities	(280)	(371)	(693)	(736)
Numerator for basic and diluted net income available to common stockholders	$ 46,825	$ 35,468	$ 99,540	$ 532,734
Denominator:
Basic weighted average vested units outstanding (in shares)	116,822,234	116,451,931	116,736,706	116,398,450
Effect of dilutive securities (in shares)	362,704	465,532	386,155	461,295
Diluted weighted average vested shares and common stock equivalents outstanding (in shares)	117,184,938	116,917,463	117,122,861	116,859,745
Basic earnings per unit:
Net income available to common stockholders per unit (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.58
Diluted earnings per unit:
Net income available to common stockholders per unit (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.56
Kilroy Realty L.P.
Numerator:
Net income available to common unitholders	$ 47,620	$ 36,193	$ 101,264	$ 538,710
Allocation to participating securities	(280)	(371)	(693)	(736)
Numerator for basic and diluted net income available to common stockholders	$ 47,340	$ 35,822	$ 100,571	$ 537,974
Denominator:
Basic weighted average vested units outstanding (in shares)	117,972,808	117,602,505	117,887,280	117,549,024
Effect of dilutive securities (in shares)	362,704	465,532	386,155	461,295
Diluted weighted average vested shares and common stock equivalents outstanding (in shares)	118,335,512	118,068,037	118,273,435	118,010,319
Basic earnings per unit:
Net income available to common stockholders per unit (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.58
Diluted earnings per unit:
Net income available to common stockholders per unit (in dollars per share)	$ 0.40	$ 0.30	$ 0.85	$ 4.56

Supplemental Cash Flow Inform_5

Supplemental Cash Flow Information of the Company - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	$ 36,476	$ 33,244
Cash paid for interest, net of capitalized interest of $36,476 and $33,244 as of June 30, 2022 and 2021, respectively	39,703	41,520
Cash paid for amounts included in the measurement of ground lease liabilities	3,253	2,887
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	62,443	85,490
Tenant improvements funded directly by tenants	7,210	4,265
Assumption of accrued liabilities in connection with acquisitions	0	37,572
Initial measurement of operating right of use ground lease assets	0	46,430
Initial measurement of operating ground lease liabilities	0	46,430
NON-CASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders (Note 15)	$ 61,880	$ 59,455

Supplemental Cash Flow Inform_6

Supplemental Cash Flow Information of the Company - Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	$ 210,044	$ 414,077	$ 519,307	$ 731,991
Restricted cash	13,008	13,006	450,457	91,139
Cash and cash equivalents and restricted cash	$ 223,052	$ 427,083	$ 969,764	$ 823,130

Supplemental Cash Flow Inform_7

Supplemental Cash Flow Information of the Operating Partnership - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	$ 36,476	$ 33,244
Cash paid for interest, net of capitalized interest of $36,476 and $33,244 as of June 30, 2022 and 2021, respectively	39,703	41,520
Cash paid for amounts included in the measurement of ground lease liabilities	3,253	2,887
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	62,443	85,490
Tenant improvements funded directly by tenants	7,210	4,265
Assumption of accrued liabilities in connection with acquisitions	0	37,572
Initial measurement of operating right of use ground lease assets	0	46,430
Initial measurement of operating ground lease liabilities	0	46,430
NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders	61,880	59,455
Kilroy Realty L.P.
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	36,476	33,244
Cash paid for interest, net of capitalized interest of $36,476 and $33,244 as of June 30, 2022 and 2021, respectively	39,703	41,520
Cash paid for amounts included in the measurement of ground lease liabilities	3,253	2,887
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	62,443	85,490
Tenant improvements funded directly by tenants	7,210	4,265
Assumption of accrued liabilities in connection with acquisitions	0	37,572
Initial measurement of operating right of use ground lease assets	0	46,430
Initial measurement of operating ground lease liabilities	0	46,430
NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders	$ 61,880	$ 59,455

Supplemental Cash Flow Inform_8

Supplemental Cash Flow Information of the Operating Partnership - Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	$ 210,044	$ 414,077	$ 519,307	$ 731,991
Restricted cash	13,008	13,006	450,457	91,139
Cash and cash equivalents and restricted cash	223,052	427,083	969,764	823,130
Kilroy Realty L.P.
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	210,044	414,077	519,307	731,991
Restricted cash	13,008	13,006	450,457	91,139
Cash and cash equivalents and restricted cash	$ 223,052	$ 427,083	$ 969,764	$ 823,130

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Jul. 13, 2022 USD ($)
Subsequent Event
Subsequent Event [Line Items]
Payment of dividends	$ 61.9