Kilroy Realty (KRC) 10-K 13 Feb 25 2024 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2024	Feb. 07, 2025	Jun. 30, 2024
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-12675
Entity Registrant Name	KILROY REALTY CORPORATION
Entity Incorporation, State or Country 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 Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 3,649,816,084
Entity Common Stock, Shares Outstanding		118,136,676
Documents Incorporated by Reference	Portions of the Kilroy Realty Corporation’s Proxy Statement with respect to its 2025 Annual Meeting of Stockholders to be filed not later than 120 days after the end of the registrant’s fiscal year are incorporated by reference into Part III of this Form 10-K.
Entity Central Index Key	0001025996
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Kilroy Realty L.P.
Entity Information [Line Items]
Current Fiscal Year End Date	--12-31
Entity File Number	000-54005
Entity Registrant Name	KILROY REALTY, L.P.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4612685
Title of 12(g) Security	Common Units Representing Limited Partnership Interests
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Central Index Key	0001493976
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Entity Information [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Los Angeles, California
Kilroy Realty L.P.
Entity Information [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Los Angeles, California

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
REAL ESTATE ASSETS (Notes 2, 3, and 4):
Land and improvements	$ 1,750,820	$ 1,743,170
Buildings and improvements	8,598,751	8,463,674
Undeveloped land and construction in progress	2,309,624	2,034,804
Total real estate assets held for investment	12,659,195	12,241,648
Accumulated depreciation and amortization	(2,824,616)	(2,518,304)
Total real estate assets held for investment, net	9,834,579	9,723,344
CASH AND CASH EQUIVALENTS (Note 23)	165,690	510,163
MARKETABLE SECURITIES (Notes 5, 17, and 20)	27,965	284,670
CURRENT RECEIVABLES, NET (Notes 2 and 6)	11,033	13,609
DEFERRED RENT RECEIVABLES, NET (Notes 2 and 6)	451,996	460,979
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2, 3, and 7)	225,937	229,705
RIGHT OF USE GROUND LEASE ASSETS (Note 19)	129,222	125,506
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 8)	51,935	53,069
TOTAL ASSETS	10,898,357	11,401,045
LIABILITIES:
Secured debt, net (Notes 9, 10, and 20)	598,199	603,225
Unsecured debt, net (Notes 9, 10, and 20)	3,999,566	4,325,153
Accounts payable, accrued expenses and other liabilities (Note 19)	285,011	371,179
Ground lease liabilities (Note 19)	128,422	124,353
Accrued dividends and distributions (Note 14)	64,850	64,440
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2, 3, 7, and 11)	142,437	173,638
Rents received in advance and tenant security deposits	71,003	79,364
Total liabilities	5,289,488	5,741,352
COMMITMENTS AND CONTINGENCIES (Note 19)
Stockholders’ Equity (Note 14):
Common stock, $.01 par value, 280,000,000 shares authorized, 118,046,674 and 117,239,558 shares issued and outstanding	1,181	1,173
Additional paid-in capital	5,209,653	5,205,839
Retained earnings	171,212	221,149
Total stockholders’ equity	5,382,046	5,428,161
Noncontrolling Interests (Notes 2 and 12):
Common units of the Operating Partnership	52,472	53,275
Noncontrolling interests in consolidated property partnerships	174,351	178,257
Total noncontrolling interests	226,823	231,532
Total equity	5,608,869	5,659,693
TOTAL LIABILITIES AND EQUITY	$ 10,898,357	$ 11,401,045

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Common stock, par value ( in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	280,000,000	280,000,000
Common stock, shares issued (in shares)	118,046,674	117,239,558
Common stock, shares outstanding (in shares)	118,046,674	117,239,558

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]	Service [Member]
REVENUES (Note 2):
Rental income (Note 18)	$ 1,118,115	$ 1,117,737	$ 1,086,018
Other property income	17,514	11,957	10,969
Total revenues	1,135,629	1,129,694	1,096,987
EXPENSES:
Property expenses	243,441	228,964	202,744
Real estate taxes	108,951	105,868	105,869
Ground leases (Note 19)	11,715	9,732	7,565
General and administrative expenses (Note 16)	72,066	93,434	93,642
Leasing costs	8,764	6,506	4,879
Depreciation and amortization (Notes 2 and 7)	356,182	355,278	357,611
Total expenses	801,119	799,782	772,310
OTHER INCOME (EXPENSES):
Interest and other income, net (Note 20)	37,752	22,592	1,765
Interest expense (Note 10)	(145,287)	(114,216)	(84,278)
Gains on sales of depreciable operating properties (Note 4)	0	0	17,329
Gain on sales of long-lived assets	5,979	0	0
Total other (expenses) income	(101,556)	(91,624)	(65,184)
NET INCOME	232,954	238,288	259,493
Net income attributable to noncontrolling common units of the Operating Partnership (Notes 2 and 12)	(2,062)	(2,083)	(2,283)
Net income attributable to noncontrolling interests in consolidated property partnerships (Notes 2 and 12)	(19,923)	(23,964)	(24,595)
Total income attributable to noncontrolling interests	(21,985)	(26,047)	(26,878)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 210,969	$ 212,241	$ 232,615
Net income available to common stockholders per share - basic ( in dollars per share)	$ 1.78	$ 1.80	$ 1.98
Net income available to common stockholders per share - diluted (in dollars per share)	$ 1.77	$ 1.80	$ 1.97
Weighted average common units outstanding - basic (in shares)	117,649,111	117,160,173	116,806,575
Weighted average shares of common stock outstanding – diluted (in shares)	118,156,987	117,506,255	117,220,047

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, 2021			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	259,493	232,615			232,615	26,878
Issuance of share-based compensation awards	3,607	3,607		3,607
Non-cash amortization of share-based compensation	34,793	34,793		34,793
Settlement of restricted stock units for shares of common stock (in shares)			745,248
Settlement of restricted stock units for shares of common stock	0	0	$ 7	(7)
Repurchase of common stock and restricted stock units (in shares)			(331,386)
Repurchase of common stock and restricted stock units	(22,934)	(22,934)	$ (3)	(22,931)
Distributions to noncontrolling interests in consolidated property partnerships	(36,269)					(36,269)
Adjustment for noncontrolling interest in the Operating Partnership	0	66		66		(66)
Dividends declared per share of common stock and common unit	(253,599)	(251,160)			(251,160)	(2,439)
Ending balance (in shares) at Dec. 31, 2022			116,878,031
Ending balance at Dec. 31, 2022	5,674,961	5,437,047	$ 1,169	5,170,760	265,118	237,914
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	238,288	212,241			212,241	26,047
Issuance of share-based compensation awards	3,110	3,110		3,110
Non-cash amortization of share-based compensation	43,721	43,721		43,721
Settlement of restricted stock units for shares of common stock (in shares)			664,600
Settlement of restricted stock units for shares of common stock	0	0	$ 7	(7)
Repurchase of common stock and restricted stock units (in shares)			(303,073)
Repurchase of common stock and restricted stock units	(11,595)	(11,595)	$ (3)	(11,592)
Distributions to noncontrolling interests in consolidated property partnerships	(30,097)					(30,097)
Adjustment for noncontrolling interest in the Operating Partnership	0	(153)		(153)		153
Dividends declared per share of common stock and common unit	$ (258,695)	(256,210)			(256,210)	(2,485)
Ending balance (in shares) at Dec. 31, 2023	117,239,558		117,239,558
Ending balance at Dec. 31, 2023	$ 5,659,693	5,428,161	$ 1,173	5,205,839	221,149	231,532
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	232,954	210,969			210,969	21,985
Issuance of share-based compensation awards	6,675	6,675		6,675
Non-cash amortization of share-based compensation	24,402	24,402		24,402
Settlement of restricted stock units for shares of common stock (in shares)			1,486,127
Settlement of restricted stock units for shares of common stock	0	0	$ 15	(15)
Repurchase of common stock and restricted stock units (in shares)			(679,011)
Repurchase of common stock and restricted stock units	(27,636)	(27,636)	$ (7)	(27,629)
Distributions to noncontrolling interests in consolidated property partnerships	(23,829)					(23,829)
Adjustment for noncontrolling interest in the Operating Partnership	0	381		381		(381)
Dividends declared per share of common stock and common unit	$ (263,390)	(260,906)			(260,906)	(2,484)
Ending balance (in shares) at Dec. 31, 2024	118,046,674		118,046,674
Ending balance at Dec. 31, 2024	$ 5,608,869	$ 5,382,046	$ 1,181	$ 5,209,653	$ 171,212	$ 226,823

CONSOLIDATED STATEMENTS OF EQ_2

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends declared per share of common stock and common unit ( in dollars per share)	$ 2.16	$ 2.16	$ 2.120

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 232,954	$ 238,288	$ 259,493
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	349,828	348,064	350,665
Depreciation of non-real estate furniture, fixtures, and equipment	6,354	7,214	6,946
Revenue reversals (recoveries) for doubtful accounts, net (Notes 2 and 18)	2,416	11,553	(123)
Non-cash amortization of share-based compensation awards (Note 16)	17,714	36,858	28,347
Non-cash amortization of deferred financing costs and net debt discounts	6,893	5,200	3,657
Non-cash amortization of net below market rents (Note 7)	(3,521)	(6,648)	(10,476)
Gains on sales of depreciable operating properties (Note 4)	0	0	(17,329)
Gain on sales of long-lived assets	(5,979)	0	0
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements (Note 11)	(17,605)	(19,181)	(19,321)
Straight-line rents	3,160	(19,262)	(46,231)
Amortization of right of use ground lease assets	1,066	1,024	772
Net change in other operating assets	1,894	2,322	(12,606)
Net change in other operating liabilities	(54,025)	(2,843)	48,441
Net cash provided by operating activities	541,149	602,589	592,235
CASH FLOWS FROM INVESTING ACTIVITIES:
Maturity (Purchases) of certificates of deposit (Note 5)	256,581
Maturity (Purchases) of certificates of deposit (Note 5)		(256,581)	0
Expenditures for development and redevelopment properties and undeveloped land	(365,521)	(446,426)	(453,774)
Expenditures for operating properties and other capital assets	(100,303)	(97,393)	(92,802)
Expenditures for acquisitions of development properties and undeveloped land (Note 3)	0	0	(40,033)
Net proceeds received from dispositions of long-lived assets (Note 8)	19,354	0	0
Net proceeds received from dispositions of real estate assets (Note 4)	0	0	33,416
Expenditures for acquisitions of operating properties	(35,155)	0	0
Net cash used in investing activities	(225,044)	(800,400)	(553,193)
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions to noncontrolling interests in consolidated property partnerships	(23,829)	(30,097)	(36,269)
Dividends and distributions paid to common stockholders and common unitholders	(256,306)	(255,430)	(247,556)
Repurchase of common stock and restricted stock units (Note 16)	(27,636)	(11,595)	(22,934)
Financing costs (Note 10)	(18,605)	(10,924)	(6,432)
Principal payments and repayments of secured debt (Note 10)	(6,006)	(5,775)	(5,555)
Proceeds from the issuance of unsecured debt (Note 10)	395,516	0	0
Repayments of unsecured debt (Note 10)	(723,712)	0	0
Borrowings on unsecured debt (Note 10)	0	320,000	200,000
Repurchases of unsecured debt (Note 10)	0	(20,584)	0
Proceeds from the issuance of secured debt (Note 10)	0	375,000	0
Net cash (used in) provided by financing activities	(660,578)	360,595	(118,746)
Net (decrease) increase in cash and cash equivalents and restricted cash	(344,473)	162,784	(79,704)
Cash and cash equivalents and restricted cash, beginning of year	510,163	347,379	427,083
Cash and cash equivalents and restricted cash, end of year	$ 165,690	$ 510,163	$ 347,379

CONSOLIDATED BALANCE SHEETS (KI

CONSOLIDATED BALANCE SHEETS (KILROY REALTY, L.P.) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
REAL ESTATE ASSETS (Notes 2, 3, and 4):
Land and improvements	$ 1,750,820	$ 1,743,170
Buildings and improvements	8,598,751	8,463,674
Undeveloped land and construction in progress	2,309,624	2,034,804
Total real estate assets held for investment	12,659,195	12,241,648
Accumulated depreciation and amortization	(2,824,616)	(2,518,304)
Total real estate assets held for investment, net	9,834,579	9,723,344
CASH AND CASH EQUIVALENTS (Note 24)	165,690	510,163
MARKETABLE SECURITIES (Notes 5, 17, and 20)	27,965	284,670
CURRENT RECEIVABLES, NET (Notes 2 and 6)	11,033	13,609
DEFERRED RENT RECEIVABLES, NET (Notes 2 and 6)	451,996	460,979
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2, 3, and 7)	225,937	229,705
RIGHT OF USE GROUND LEASE ASSETS (Note 19)	129,222	125,506
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 8)	51,935	53,069
TOTAL ASSETS	10,898,357	11,401,045
LIABILITIES:
Secured debt, net (Notes 10 and 20)	598,199	603,225
Unsecured debt, net (Notes 10 and 20)	3,999,566	4,325,153
Accounts payable, accrued expenses and other liabilities (Note 19)	285,011	371,179
Ground lease liabilities (Note 19)	128,422	124,353
Accrued distributions (Note 15)	64,850	64,440
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2, 3, 7, and 11)	142,437	173,638
Rents received in advance and tenant security deposits	71,003	79,364
Total liabilities	5,289,488	5,741,352
COMMITMENTS AND CONTINGENCIES (Note 19)
CAPITAL:
TOTAL LIABILITIES AND EQUITY	10,898,357	11,401,045
Kilroy Realty L.P.
REAL ESTATE ASSETS (Notes 2, 3, and 4):
Land and improvements	1,750,820	1,743,170
Buildings and improvements	8,598,751	8,463,674
Undeveloped land and construction in progress	2,309,624	2,034,804
Total real estate assets held for investment	12,659,195	12,241,648
Accumulated depreciation and amortization	(2,824,616)	(2,518,304)
Total real estate assets held for investment, net	9,834,579	9,723,344
CASH AND CASH EQUIVALENTS (Note 24)	165,690	510,163
MARKETABLE SECURITIES (Notes 5, 17, and 20)	27,965	284,670
CURRENT RECEIVABLES, NET (Notes 2 and 6)	11,033	13,609
DEFERRED RENT RECEIVABLES, NET (Notes 2 and 6)	451,996	460,979
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2, 3, and 7)	225,937	229,705
RIGHT OF USE GROUND LEASE ASSETS (Note 19)	129,222	125,506
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 8)	51,935	53,069
TOTAL ASSETS	10,898,357	11,401,045
LIABILITIES:
Secured debt, net (Notes 10 and 20)	598,199	603,225
Unsecured debt, net (Notes 10 and 20)	3,999,566	4,325,153
Accounts payable, accrued expenses and other liabilities (Note 19)	285,011	371,179
Ground lease liabilities (Note 19)	128,422	124,353
Accrued distributions (Note 15)	64,850	64,440
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2, 3, 7, and 11)	142,437	173,638
Rents received in advance and tenant security deposits	71,003	79,364
Total liabilities	5,289,488	5,741,352
COMMITMENTS AND CONTINGENCIES (Note 19)
CAPITAL:
Partner’s Capital - Common units, 118,046,674 and 117,239,558 held by the general partner and 1,150,574 and 1,150,574 held by common limited partners issued and outstanding (Note 15)	5,434,518	5,481,436
Noncontrolling interests in consolidated property partnerships (Notes 2 and 13)	174,351	178,257
Total capital	5,608,869	5,659,693
TOTAL LIABILITIES AND EQUITY	$ 10,898,357	$ 11,401,045

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (KILROY REALTY, L.P.) (Parenthetical) - Common Units - Kilroy Realty L.P. - shares	Dec. 31, 2024	Dec. 31, 2023
General partner, units issued (in shares)	118,046,674	117,239,558
General partner, units outstanding (in shares)	118,046,674	117,239,558
Limited partner, units issued (in shares)	1,150,574	1,150,574
Limited partner, units outstanding (in shares)	1,150,574	1,150,574

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS (KILROY REALTY, L.P.) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]	Service [Member]
REVENUES (Note 2):
Rental income (Note 18)	$ 1,118,115	$ 1,117,737	$ 1,086,018
Other property income	17,514	11,957	10,969
Total revenues	1,135,629	1,129,694	1,096,987
EXPENSES:
Property expenses	243,441	228,964	202,744
Real estate taxes	108,951	105,868	105,869
Ground leases (Note 19)	11,715	9,732	7,565
General and administrative expenses (Note 16)	72,066	93,434	93,642
Leasing costs	8,764	6,506	4,879
Depreciation and amortization (Notes 2 and 7)	356,182	355,278	357,611
Total expenses	801,119	799,782	772,310
OTHER INCOME (EXPENSES):
Interest and other income, net (Note 20)	37,752	22,592	1,765
Interest expense (Note 10)	(145,287)	(114,216)	(84,278)
Gains on sales of depreciable operating properties (Note 4)	0	0	17,329
Gain on sales of long-lived assets	5,979	0	0
Total other (expenses) income	(101,556)	(91,624)	(65,184)
NET INCOME	232,954	238,288	259,493
Net income attributable to noncontrolling interests in consolidated property partnerships (Notes 2 and 13)	(21,985)	(26,047)	(26,878)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 210,969	$ 212,241	$ 232,615
Net income available to common stockholders per share - basic ( in dollars per share)	$ 1.78	$ 1.80	$ 1.98
Net income available to common stockholders per share - diluted (in dollars per share)	$ 1.77	$ 1.80	$ 1.97
Weighted average common units outstanding - basic (in shares)	117,649,111	117,160,173	116,806,575
Weighted average common units outstanding - diluted (in shares)	118,156,987	117,506,255	117,220,047
Kilroy Realty L.P.
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]	Service [Member]
REVENUES (Note 2):
Rental income (Note 18)	$ 1,118,115	$ 1,117,737	$ 1,086,018
Other property income	17,514	11,957	10,969
Total revenues	1,135,629	1,129,694	1,096,987
EXPENSES:
Property expenses	243,441	228,964	202,744
Real estate taxes	108,951	105,868	105,869
Ground leases (Note 19)	11,715	9,732	7,565
General and administrative expenses (Note 16)	72,066	93,434	93,642
Leasing costs	8,764	6,506	4,879
Depreciation and amortization (Notes 2 and 7)	356,182	355,278	357,611
Total expenses	801,119	799,782	772,310
OTHER INCOME (EXPENSES):
Interest and other income, net (Note 20)	37,752	22,592	1,765
Interest expense (Note 10)	(145,287)	(114,216)	(84,278)
Gains on sales of depreciable operating properties (Note 4)	0	0	17,329
Gain on sales of long-lived assets		0	0
Total other (expenses) income	(101,556)	(91,624)	(65,184)
NET INCOME	232,954	238,288	259,493
Net income attributable to noncontrolling interests in consolidated property partnerships (Notes 2 and 13)	(19,923)	(23,964)	(24,595)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 213,031	$ 214,324	$ 234,898
Net income available to common stockholders per share - basic ( in dollars per share)	$ 1.78	$ 1.80	$ 1.98
Net income available to common stockholders per share - diluted (in dollars per share)	$ 1.77	$ 1.80	$ 1.97
Weighted average common units outstanding - basic (in shares)	118,799,685	118,310,747	117,957,149
Weighted average common units outstanding - diluted (in shares)	119,307,561	118,656,829	118,370,621

CONSOLIDATED STATEMENTS OF CAPI

CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 232,954	$ 238,288	$ 259,493
Non-cash amortization of share-based compensation	24,402	43,721	34,793
Distributions to noncontrolling interests in consolidated property partnerships	(23,829)	(30,097)	(36,269)
Noncontrolling Interests in Consolidated Property Partnerships and Subsidiaries
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,985	26,047	26,878
Distributions to noncontrolling interests in consolidated property partnerships	(23,829)	(30,097)	(36,269)
Kilroy Realty L.P.
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	5,659,693	5,674,961	5,689,870
Net income	232,954	238,288	259,493
Issuance of share-based compensation awards	6,675	3,110	3,607
Non-cash amortization of share-based compensation	24,402	43,721	34,793
Repurchase of common units and restricted stock units	(27,636)	(11,595)	(22,934)
Distributions to noncontrolling interests in consolidated property partnerships	(23,829)	(30,097)	(36,269)
Distributions declared per common unit	(263,390)	(258,695)	(253,599)
Ending balance	$ 5,608,869	$ 5,659,693	$ 5,674,961
Kilroy Realty L.P. | Partners’ Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	118,390,132	118,028,605	117,614,743
Beginning balance	$ 5,481,436	$ 5,490,571	$ 5,493,806
Net income	213,031	214,324	234,898
Issuance of share-based compensation awards	6,675	3,110	3,607
Non-cash amortization of share-based compensation	$ 24,402	$ 43,721	$ 34,793
Settlement of restricted stock units (in shares)	1,486,127	664,600	745,248
Repurchase and cancellation of common units and restricted stock units (in shares)	(679,011)	(303,073)	(331,386)
Repurchase of common units and restricted stock units	$ (27,636)	$ (11,595)	$ (22,934)
Distributions declared per common unit	$ (263,390)	$ (258,695)	$ (253,599)
Ending balance (in shares)	119,197,248	118,390,132	118,028,605
Ending balance	$ 5,434,518	$ 5,481,436	$ 5,490,571
Kilroy Realty L.P. | Noncontrolling Interests in Consolidated Property Partnerships and Subsidiaries
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	178,257	184,390	196,064
Net income	19,923	23,964	24,595
Distributions to noncontrolling interests in consolidated property partnerships	(23,829)	(30,097)	(36,269)
Ending balance	$ 174,351	$ 178,257	$ 184,390

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Kilroy Realty L.P.
Distributions declared per common unit (dollars per share)	$ 2.16	$ 2.16	$ 2.12

CONSOLIDATED STATEMENTS OF CA_3

CONSOLIDATED STATEMENTS OF CASH FLOWS (KILROY REALTY, L.P.) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 232,954	$ 238,288	$ 259,493
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	349,828	348,064	350,665
Depreciation of non-real estate furniture, fixtures, and equipment	6,354	7,214	6,946
Revenue reversals (recoveries) for doubtful accounts, net (Notes 2 and 18)	2,416	11,553	(123)
Non-cash amortization of share-based compensation awards (Note 16)	17,714	36,858	28,347
Non-cash amortization of deferred financing costs and net debt discounts	6,893	5,200	3,657
Non-cash amortization of net below market rents (Note 7)	(3,521)	(6,648)	(10,476)
Gains on sales of depreciable operating properties (Note 4)	0	0	(17,329)
Gain on sales of long-lived assets	(5,979)	0	0
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements (Note 11)	(17,605)	(19,181)	(19,321)
Straight-line rents	3,160	(19,262)	(46,231)
Amortization of right of use ground lease assets	1,066	1,024	772
Net change in other operating assets	1,894	2,322	(12,606)
Net change in other operating liabilities	(54,025)	(2,843)	48,441
Net cash provided by operating activities	541,149	602,589	592,235
CASH FLOWS FROM INVESTING ACTIVITIES:
Maturity (Purchases) of certificates of deposit (Note 5)	256,581
Maturity (Purchases) of certificates of deposit (Note 5)		(256,581)	0
Expenditures for development and redevelopment properties and undeveloped land	(365,521)	(446,426)	(453,774)
Expenditures for operating properties and other capital assets	(100,303)	(97,393)	(92,802)
Expenditures for acquisitions of development properties and undeveloped land (Note 3)	0	0	(40,033)
Net proceeds received from dispositions of long-lived assets (Note 8)	19,354	0	0
Net proceeds received from dispositions of real estate assets (Note 4)	0	0	33,416
Expenditures for acquisitions of operating properties	(35,155)	0	0
Net cash used in investing activities	(225,044)	(800,400)	(553,193)
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions to noncontrolling interests in consolidated property partnerships	(23,829)	(30,097)	(36,269)
Distributions paid to common unitholders	(256,306)	(255,430)	(247,556)
Repurchase of common stock and restricted stock units (Note 16)	(27,636)	(11,595)	(22,934)
Financing costs (Note 10)	(18,605)	(10,924)	(6,432)
Principal payments and repayments of secured debt (Note 10)	(6,006)	(5,775)	(5,555)
Proceeds from the issuance of unsecured debt (Note 10)	395,516	0	0
Repayments of unsecured debt (Note 10)	(723,712)	0	0
Borrowings on unsecured debt (Note 10)	0	320,000	200,000
Repurchases of unsecured debt (Note 10)	0	(20,584)	0
Proceeds from the issuance of secured debt (Note 10)	0	375,000	0
Net cash (used in) provided by financing activities	(660,578)	360,595	(118,746)
Net (decrease) increase in cash and cash equivalents and restricted cash	(344,473)	162,784	(79,704)
Cash and cash equivalents and restricted cash, beginning of year	510,163	347,379	427,083
Cash and cash equivalents and restricted cash, end of year	165,690	510,163	347,379
Kilroy Realty L.P.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	232,954	238,288	259,493
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	349,828	348,064	350,665
Depreciation of non-real estate furniture, fixtures, and equipment	6,354	7,214	6,946
Revenue reversals (recoveries) for doubtful accounts, net (Notes 2 and 18)	2,416	11,553	(123)
Non-cash amortization of share-based compensation awards (Note 16)	17,714	36,858	28,347
Non-cash amortization of deferred financing costs and net debt discounts	6,893	5,200	3,657
Non-cash amortization of net below market rents (Note 7)	(3,521)	(6,648)	(10,476)
Gains on sales of depreciable operating properties (Note 4)	0	0	(17,329)
Gain on sales of long-lived assets	(5,979)	0	0
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements (Note 11)	(17,605)	(19,181)	(19,321)
Straight-line rents	3,160	(19,262)	(46,231)
Amortization of right of use ground lease assets	1,066	1,024	772
Net change in other operating assets	1,894	2,322	(12,606)
Net change in other operating liabilities	(54,025)	(2,843)	48,441
Net cash provided by operating activities	541,149	602,589	592,235
CASH FLOWS FROM INVESTING ACTIVITIES:
Maturity (Purchases) of certificates of deposit (Note 5)	256,581
Maturity (Purchases) of certificates of deposit (Note 5)		(256,581)	0
Expenditures for development and redevelopment properties and undeveloped land	(365,521)	(446,426)	(453,774)
Expenditures for operating properties and other capital assets	(100,303)	(97,393)	(92,802)
Expenditures for acquisitions of development properties and undeveloped land (Note 3)	0	0	(40,033)
Net proceeds received from dispositions of long-lived assets (Note 8)	19,354	0	0
Net proceeds received from dispositions of real estate assets (Note 4)	0	0	33,416
Expenditures for acquisitions of operating properties	(35,155)	0	0
Net cash used in investing activities	(225,044)	(800,400)	(553,193)
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions to noncontrolling interests in consolidated property partnerships	(23,829)	(30,097)	(36,269)
Distributions paid to common unitholders	(256,306)	(255,430)	(247,556)
Repurchase of common stock and restricted stock units (Note 16)	(27,636)	(11,595)	(22,934)
Financing costs (Note 10)	(18,605)	(10,924)	(6,432)
Principal payments and repayments of secured debt (Note 10)	(6,006)	(5,775)	(5,555)
Proceeds from the issuance of unsecured debt (Note 10)	395,516	0	0
Repayments of unsecured debt (Note 10)	(723,712)	0	0
Borrowings on unsecured debt (Note 10)	0	320,000	200,000
Repurchases of unsecured debt (Note 10)	0	(20,584)	0
Proceeds from the issuance of secured debt (Note 10)	0	375,000	0
Net cash (used in) provided by financing activities	(660,578)	360,595	(118,746)
Net (decrease) increase in cash and cash equivalents and restricted cash	(344,473)	162,784	(79,704)
Cash and cash equivalents and restricted cash, beginning of year	510,163	347,379	427,083
Cash and cash equivalents and restricted cash, end of year	$ 165,690	$ 510,163	$ 347,379

Organization and Ownership

Organization and Ownership	12 Months Ended
	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Ownership	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 property types in the United States. The Company’s approach to modern business environments is designed to drive creativity and productivity for some of the world’s leading technology, entertainment, life science, and business services companies and we have been consistently recognized for our leadership in sustainability and building operations. The Company owns, develops, acquires, and manages real estate assets, consisting primarily of premier properties in Los Angeles, San Diego, the San Francisco Bay Area, Seattle, and Austin, which we believe have strategic advantages and strong barriers to entry. The Company qualifies as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”). The Company’s common stock is publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “KRC.” We own our interests in all of our real estate assets through Kilroy Realty, L.P. (the “Operating Partnership”) and conduct substantially all of our operations through the Operating Partnership. Unless stated otherwise or the context otherwise requires, the terms “Kilroy Realty Corporation” or the “Company,” “we,” “our,” and “us” refer to Kilroy Realty Corporation and its consolidated subsidiaries, including the Operating Partnership, 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 December 31, 2024: Number of Rentable Number of Percentage Occupied (unaudited) (1) Stabilized Office Properties (2) 123 17,142,721 428 82.8 % _______________________ (1) Represents economic occupancy for space where we have achieved revenue recognition for the associated lease agreements. (2) Includes stabilized life science and retail space. Number of Number of 2024 Average Occupancy (unaudited) Stabilized Residential Properties 3 1,001 92.5 % Our stabilized portfolio includes all of our properties with the exception of development and redevelopment properties currently committed for construction, under construction, or in the tenant improvement phase, 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 pursuant to a formal plan to change its use, the intended result of which is a higher economic return on the property. We define a property in the tenant improvement phase as a development or redevelopment property where the project has reached “cold shell condition” and is ready for tenant improvements, which may require additional major base building modifications before being placed in service. Projects in the tenant improvement phase are moved into 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 as the projects or phases of projects are placed in service. We did not have any properties or undeveloped land held for sale at December 31, 2024. As of December 31, 2024, the following properties were excluded from our stabilized portfolio: Number of Estimated Rentable Square Feet (1) (unaudited) In-process redevelopment projects - tenant improvement 2 100,000 In-process development projects - under construction 1 875,000 ____________________ (1) Estimated rentable square feet upon completion. Our stabilized portfolio also excludes our future development pipeline, which, as of December 31, 2024, was comprised of eight future development sites, representing approximately 64 gross acres of undeveloped land. As of December 31, 2024, all of our properties and development and redevelopment projects, 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 stabilized office property and one future development project located in Austin, Texas. All of our properties and development 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 December 31, 2024, 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 December 31, 2024, 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. As of December 31, 2024, 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 December 31, 2024 was owned by non-affiliated investors and a former executive officer and director. 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.

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Basis of Presentation and Significant Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies 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. Partially Owned Entities and Variable Interest Entities At December 31, 2024, 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 third quarter of 2024 to facilitate a potential future Section 1031 Exchange. At December 31, 2024, 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 December 31, 2024, the three VIEs’ total assets, liabilities, and noncontrolling interests included on our consolidated balance sheet were approximately $435.5 million (of which $357.3 million related to real estate held for investment), approximately $18.0 million, and approximately $169.4 million, respectively. At December 31, 2023, 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, 2023, 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, 2023 the two VIEs’ total assets, liabilities, and noncontrolling interests included on our consolidated balance sheet were approximately $416.7 million (of which $350.0 million related to real estate held for investment on our consolidated balance sheet), approximately $23.6 million, and approximately $173.7 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. Our accounting policy is to consolidate entities in which we have a controlling financial interest and significant decision making control over the entity’s operations. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, size of our investment (including loans), authority to control decisions, and contractual and substantive participating rights of the members. In addition to evaluating control rights, we consolidate entities in which the other members have no substantive kick-out rights to remove the Company as the managing member. Entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or the holders of the equity investment at risk do not have a controlling financial interest are VIEs. We evaluate whether an entity is a VIE and whether we are the primary beneficiary. We are deemed to be the primary beneficiary of a VIE when we have the power to direct the activities of the VIE that most significantly impact the VIEs’ economic performance and the obligation to absorb losses or receive benefits that could potentially be significant to the VIE. If the requirements for consolidation are not met, the Company would account for investments under the equity method of accounting if we have the ability to exercise significant influence over the entity. Equity method investments would be initially recorded at cost and subsequently adjusted for our share of net income or loss and cash contributions and distributions each period. The Company did not have any equity method investments at December 31, 2024 or 2023. Significant Accounting Policies Revenue Recognition Rental revenue for office, life science, retail, and residential operating properties is our principal source of revenue. We recognize revenue from base rent (fixed lease payments), additional rent (variable lease payments, which consist of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs), parking, and other lease-related revenue once all of the following criteria are met: (i) the agreement has been fully executed and delivered, (ii) services have been rendered, (iii) the amount is fixed or determinable, and (iv) payment has been received or the collectability of substantially all of the amount due is probable. Minimum annual rental revenues are recognized in rental revenues on a straight-line basis over the non-cancellable term of the related lease. Base Rent The timing of when we commence rental revenue recognition for office, life science, and retail properties depends largely on our conclusion as to whether we are or the tenant is the owner of tenant improvements at the leased property for accounting purposes. When we conclude that we are the owner of tenant improvements for accounting purposes, we record the cost to construct the tenant improvements as an asset and commence rental revenue recognition when the tenant takes possession of or controls the finished space, which is generally when tenant improvements being recorded as our assets are substantially complete. In certain instances, when we conclude that the tenant is the owner of certain tenant improvements for accounting purposes, rental revenue recognition begins when the tenant takes possession or controls the physical use of the leased space. The determination of who owns the tenant improvements is made on a lease-by-lease basis and has a significant effect on the timing of commencement of revenue recognition. Further, we may deliver leased space in phases, rather than for an entire building or project, resulting in various revenue commencement dates for a particular lease, which involves significant judgment surrounding when the tenant takes possession of or controls each respective phase, building or project. When we conclude that we are the owner of tenant improvements for accounting purposes, we record the cost to construct the tenant improvements, including costs paid for or reimbursed by the tenants, as our capital asset. For these tenant-funded tenant improvements, we record the amount funded by or reimbursed by tenants as deferred revenue, which is amortized and recognized as rental income on a straight-line basis over the term of the related lease beginning upon substantial completion of the leased premises. When we conclude that the tenant is the owner of certain tenant improvements for accounting purposes, we record our contribution towards those tenant-owned improvements as a lease incentive, which is included in deferred leasing costs and acquisition-related intangible assets, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the related lease beginning upon substantial completion of the leased premises. For residential properties, we commence revenue recognition upon lease commencement. Residential rental revenue is recognized on a straight-line basis over the term of the related lease, which is generally one year, net of any concessions. When a lease is amended, we determine whether (i) an additional right of use not included in the original lease is being granted as a result of the modification, and (ii) there is an increase in the lease payments that is commensurate with the standalone price for the additional right of use. If both of these conditions are met, the amendment is accounted for as a separate lease contract. If either of those conditions are not met, the amendment is accounted for as a lease modification. Most of our lease amendments are accounted for as modifications of our operating leases, which requires us to reassess both the lease term and fixed lease payments, including any prepaid or deferred rent receivables relating to the original lease, as a part of the lease payments for the modified lease. Termination options in some of our leases allow the tenant to terminate the lease, in part or in whole, prior to the end of the lease term under certain circumstances. Termination options generally require advance notification from the tenant and payment of a termination fee that reimburses us for a portion of the remaining rent under the original lease term and the net book value of lease inception costs such as commissions, tenant improvements and lease incentives. Termination fee income, included in rental income, is recognized on a straight-line basis from the date of the executed termination agreement through the revised lease expiration when the amount of the fee is determinable and collectability of the fee is probable. This fee income is reduced on a straight-line basis by any deferred rent receivable related to the lease. Generally, our leases require the tenant to restore the leased space to standard office condition upon the expiration of the lease. In some circumstances, tenants may negotiate to pay us a restoration fee in lieu of restoring the space. Restoration fee income, included in rental income, is recognized on a straight-line basis from the date of the executed restoration fee agreement through lease expiration when the amount of the fee is determinable and collectability of the fee is probable. When tenants declare bankruptcy, we may be able to collect some portion of their past-due rents through the bankruptcy process, whether through applying security deposit balances, drawing on tenants’ letters of credit, or through bankruptcy settlements. We recognize any amounts collected through the bankruptcy process when cash is received. Additional Rent - Reimbursements from Tenants Additional rent, consisting of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs, is recognized in rental income in the period the recoverable costs are incurred. Additional rent where we pay the associated costs directly to third-party vendors and are reimbursed by our tenants are recognized and recorded on a gross basis, with the associated expense recognized in property expenses or real estate taxes. Other Property Income Other property income primarily includes amounts recorded in connection with transient daily parking, broken deal income, and property damage settlement-related payments from third-party insurance carriers. Other property income also includes miscellaneous income from tenants and fees for late rental payments. Amounts recorded within other property income fall within the scope of ASC Topic 606 “Revenue from Contracts with Customers” and are recognized as revenue at the point in time when control of the goods or services transfers to the customer and our performance obligation is satisfied. Uncollectible Lease Receivables and Allowances for Tenant and Deferred Rent Receivables Current tenant receivables consist primarily of amounts due for contractual lease payments and reimbursements of common area maintenance expenses, property taxes, and other costs recoverable from tenants. Deferred rent receivables represent the amount by which the cumulative straight-line rental revenue recorded to date exceeds cash rents billed to date under the lease agreement. We carry our current and deferred rent receivables net of allowances for amounts that may not be collected. These allowances are increased or decreased through rental income, and our determination of the adequacy of the Company’s allowances for tenant receivables includes a binary assessment of whether or not substantially all of the amounts due under a tenant’s lease agreement are probable of collection. Such assessment involves using a methodology that incorporates a specific identification analysis and an aging analysis, considering the current economic and business environment, including factors such as the age and nature of the receivables, the payment history and financial condition of the tenant, our assessment of the tenant’s ability to meet its lease obligations, and the status of negotiations of any disputes with the tenant. This determination is performed on a quarterly basis and requires significant judgment and estimates about matters that are uncertain at the time the estimates are made, including the creditworthiness of specific tenants, specific industry trends and conditions, and general economic trends and conditions. Since these factors are beyond our control, actual results can differ from our estimates, and such differences could be material. For leases that are deemed probable of collection, revenue continues to be recorded on a straight-line basis over the non-cancellable lease term and, for some tenants, may include an offsetting partial allowance for uncollectible accounts related to current tenant and deferred rent receivables that exhibit a certain level of collection risk based on the results of the assessment described above. For leases that are deemed not probable of collection, revenue is recorded as the lesser of (i) the amount which would be recognized on a straight-line basis or (ii) cash that has been received from the tenant, including deferred revenue, with any tenant and deferred rent receivable balances charged as a direct write-off against rental income in the period of the change in the collectability determination. If the collectability determination subsequently changes to being probable of collection for leases for which revenue is recorded based on cash received from the tenant, we resume recognizing revenue, including deferred revenue, on a straight-line basis and recognize incremental revenue related to the reinstatement of cumulative deferred rent receivable and deferred revenue balances, as if revenue had been recorded on a straight-line basis since the inception of the lease. Acquisitions Acquisitions of operating properties and development and redevelopment opportunities generally do not meet the definition of a business and are accounted for as asset acquisitions, as substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. For these asset acquisitions, we record the acquired tangible and intangible assets and assumed liabilities based on each asset’s and liability’s relative fair value at the acquisition date of the total purchase price plus any capitalized acquisition costs, including costs incurred during negotiation. When applicable, we record the acquired tangible and intangible assets and assumed liabilities of acquisitions of operating properties and development and redevelopment opportunities that meet the accounting criteria to be accounted for as business combinations at fair value at the acquisition date. We assess and consider fair value based on estimated cash flow projections that utilize available market information and discount and/or capitalization rates that we deem appropriate. Estimates of future cash flows are based on a number of factors, including historical operating results, known and anticipated trends, and market and economic conditions. The acquired assets and assumed liabilities for an acquisition generally include, but are not limited to: (i) land and improvements, buildings and improvements, undeveloped land and construction in progress, and (ii) identified tangible and intangible assets and liabilities associated with in-place leases, including tenant improvements, leasing costs, value of above-market and below-market operating leases and ground leases, acquired in-place lease values and tenant relationships, if any. Any debt assumed and equity (including common units of the Operating Partnership) issued in connection with a property acquisition is recorded at relative fair value on the date of acquisition. The fair value of land and improvements is derived from comparable sales of land and improvements within the same submarket and/or region. The fair value of buildings and improvements, tenant improvements and leasing costs considers the value of the property as if it was vacant as well as current replacement costs and other relevant market rate information. The fair value of the above-market or below-market component of an acquired in-place operating lease is based upon the present value (calculated using a market discount rate) of the difference between (i) the contractual rents to be paid pursuant to the lease over its remaining non-cancellable lease term, and (ii) management’s estimate of the rents that would be paid using fair market rental rates and rent escalations at the date of acquisition measured over the remaining non-cancellable term of the lease for above-market operating leases and the initial non-cancellable term plus the term of any below-market fixed rate renewal options, if applicable, for below-market operating leases. Our below-market operating leases generally do not include fixed rate or below-market renewal options. The amounts recorded for above-market operating leases are included in deferred leasing costs and acquisition-related intangible assets, net on the balance sheet and are amortized on a straight-line basis as a reduction of rental income over the remaining term of the applicable leases. The amounts recorded for below-market operating leases are included in deferred revenue and acquisition-related intangible liabilities, net on the balance sheet and are amortized on a straight-line basis as an increase to rental income over the remaining term of the applicable leases plus the term of any below-market fixed rate renewal options, if applicable. The amortization of a below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented. The amortization of an above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented. If a lease were to be terminated prior to its contractual expiration, amortization of the related above-market or below-market lease intangible would be accelerated through the termination date. The fair value of acquired in-place leases is derived based on management’s assessment of lost revenue and costs incurred for the period required to lease the “assumed vacant” property to the occupancy level when purchased. This fair value is based on a variety of considerations, including, but not necessarily limited to: (i) the value associated with lost rental revenue from existing leases during the assumed lease-up period (ii) the value associated with avoiding the cost of originating the acquired in-place leases; and (iii) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period. Factors we consider in performing these analyses include an estimate of the carrying costs during the expected lease-up periods, current market conditions, and costs to execute similar leases. In estimating carrying costs, we include real estate taxes, insurance, and other operating expenses, and estimates of lost rental revenue during the expected lease-up periods based on current market demand at market rates. In estimating costs to execute similar leases, we consider leasing commissions, legal, and other related expenses. The amount recorded for acquired in-place leases is included in deferred leasing costs and acquisition-related intangible assets, net on the balance sheet and amortized as an increase to depreciation and amortization expense over the remaining term of the applicable leases. Fully amortized intangible assets are written off each quarter. If a lease were to be terminated or if termination were determined to be likely prior to its contractual expiration (for example resulting from bankruptcy), amortization of the related unamortized in-place lease intangible would be accelerated. The determination of the fair value of any debt assumed in connection with a property acquisition is estimated by discounting the future cash flows using market interest rates available for the issuance of debt with similar terms and remaining maturities. The determination of the fair value of the acquired tangible and intangible assets and assumed liabilities of acquisitions requires us to make significant judgments and assumptions about the numerous inputs discussed above. The use of different assumptions in these fair value calculations could significantly affect the reported amounts of the allocation of our acquisition related assets and liabilities and the related depreciation and amortization expense recorded for such assets and liabilities. In addition, because the value of above and below market leases are amortized as either a reduction or increase to rental income, respectively, our judgments for these intangibles could have a significant impact on our reported rental revenues and results of operations. Transaction costs associated with our acquisitions, including costs incurred during negotiation, are capitalized as part of the purchase price of the acquisition. During the years ended December 31, 2024 and 2022, we capitalized $0.2 million of acquisition costs. We did not capitalize any acquisition costs during the year ended December 31, 2023. Operating Properties Operating properties are generally carried at historical cost less accumulated depreciation. Properties held for sale are reported at the lower of the carrying value or the fair value less estimated cost to sell. The cost of operating properties includes the purchase price or development costs of the properties. Costs incurred for the renovation and extension of the useful life of the operating properties are capitalized to our investment in that property. Maintenance and repairs are charged to expense as incurred. Cost Capitalization We capitalize all costs clearly associated with development and redevelopment activities, capital improvements, and tenant improvements as project costs, including internal compensation costs related to those activities. In addition, the following costs are capitalized as project costs during periods in which activities necessary to prepare development and redevelopment properties for their intended use are in progress: pre-construction costs essential to the development of the property, interest costs based on the weighted average interest rate of our outstanding indebtedness for the period, real estate taxes, and insurance. Determining whether expenditures meet the criteria for capitalization requires management to exercise significant judgment. Expenditures that meet one or more of the following criteria generally qualify for capitalization: • Provide benefit in future periods; • Extend the useful life of the asset beyond our original estimates; and • Increase the quality of the asset beyond our original estimates. We define redevelopment properties as those properties for which we expect to spend significant development and construction costs pursuant to a formal plan to change its use, the intended result of which is a higher economic return on the property. We define a property in the tenant improvement phase as a development or redevelopment property where the project has reached “cold shell condition” and is ready for tenant improvements, which may require additional major base building modifications before being placed in service. Projects in the tenant improvement phase are moved into 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. For office, life science, and retail development and redevelopment properties, the date the capitalization period ends is based on property-specific leasing activity: • For properties that are pre-leased, we cease capitalization when revenue recognition has commenced on the leased space, which is upon substantial completion of tenant improvements deemed to be the Company’s asset for accounting purposes. • For properties that are not pre-leased, we may not immediately build out the tenant improvements. Therefore, we cease capitalization and begin depreciation on the portion of the property for which revenue recognition has commenced on the leased space, but in any event, no later than one year after the cessation of major base building construction activities. Revenue recognition commences on leased space upon substantial completion of the tenant improvements deemed to be the Company’s asset for accounting purposes. We also cease capitalization when activities necessary to prepare the property for its intended use have been suspended. For residential development properties, we cease capitalization when the property is substantially complete and available for occupancy. Once major base building construction activities have ceased and the development or redevelopment property (or phases thereof) have been placed in service, the costs capitalized to construction in progress are transferred to land and improvements, buildings and improvements, and deferred leasing costs on our consolidated balance sheets as the historical cost of the property. Evaluation of Asset Impairment When evaluating operating real estate assets to be held and used, as well as land held for future development for potential impairment, we first evaluate whether there are any indicators of impairment. If any impairment indicators are present for a specific real estate asset, we then perform an undiscounted cash flow analysis and compare the net carrying amount of the real estate asset to the real estate asset’s estimated undiscounted future cash flows over the anticipated holding period. If the estimated undiscounted future cash flows are less than the net carrying amount of the real estate asset, we perform an impairment loss calculation. Our impairment loss calculation compares the net carrying amount of the real estate asset to the real estate asset’s estimated fair value, which may be based on estimated discounted future cash flow calculations or third-party valuations or appraisals, and we recognize an impairment loss to the extent that the asset’s net carrying amount exceeds the asset’s estimated fair value. If we recognize an impairment loss, the estimated fair value of the real estate asset becomes its new cost basis. For a depreciable long-lived asset, the new cost basis would be depreciated (amortized) over the remaining useful life of that asset. Depreciation and Amortization of Buildings and Improvements The costs of buildings and improvements and tenant improvements are depreciated using the straight-line method of accounting over the estimated useful lives set forth in the table below. Depreciation expense for buildings and improvements for the three years ended December 31, 2024, 2023, and 2022 was $308.0 million, $300.1 million, and $287.8 million, respectively. Asset Description Depreciable Lives Buildings and improvements 25 – 40 years Tenant improvements 1 – 20 years (1) ____________________ (1) Tenant improvements are amortized over the shorter of the lease term or the estimated useful life. Real Estate Assets Held for Sale, Dispositions, and Discontinued Operations A real estate asset is classified as held for sale when certain criteria are met, including, but not limited to, the availability of the asset for immediate sale, the existence of an active program to locate a buyer, and the probable sale or transfer of the asset within one year. If such criteria are met, we present the applicable assets and liabilities related to the real estate asset, if material, separately on the balance sheet as held for sale and we would cease to record depreciation and amortization expense. Real estate assets held for sale are reported at the lower of their carrying value or their estimated fair value less the estimated costs to sell. As of December 31, 2024 and 2023, we did not have any properties classified as held for sale. Property disposals representing a strategic shift that have (or will have) a major effect on the Company’s operations and financial results, such as a major line of business, a major geographical area, or a major equity method investment, are required to be presented as discontinued operations. If we were to determine that a property disposition represents a strategic shift, the revenues, expenses, and net gain (loss) on dispositions of the property would be recorded in discontinued operations for all periods presented through the date of the applicable disposition. The operations of the property sold during the year ended December 31, 2022 is presented in continuing operations as it did not represent a strategic shift in the Company’s operations and financial results. We did not dispose of any properties during the years ended December 31, 2024 and 2023. The net gains (losses) on dispositions of non-depreciable real estate property, including land, are reported in the consolidated statements of operations as gains (losses) on sale of land within continuing operations in the period the land is sold. The net gains (losses) on dispositions of depreciable real estate property are reported in the consolidated statements of operations as gains (losses) on sales of depreciable operating properties within continuing operations in the period the property is sold. Cash and Cash Equivalents We consider all highly-liquid investments, including certificates of deposit, with original maturities of three months or less to be cash equivalents. Restricted Cash Restricted cash consists of cash proceeds from dispositions that are temporarily held at qualified intermediaries for purposes of facilitating potential Section 1031 Exchanges, and cash held in escrow related to acquisition and disposition holdbacks. Restricted cash also includes cash held as collateral to provide credit enhancement for the Operating Partnership’s mortgage debt, including cash reserves for capital expenditures, tenant improvements, and property taxes. We did not have any cash held at qualified intermediaries at December 31, 2024 and 2023. Marketable Securities Marketable securities reported in our consolidated balance sheets represent certificates of deposit with original maturities greater than three months and the assets held in connection with the Kilroy Realty Corporation 2007 Deferred Compensation Plan (the “Deferred Compensation Plan”) (see Note 17 “Employee Benefit Plans” for additional information. The Company intends to hold certificates of deposit until their maturity and, as a result, they are classified as held-to-maturity securities. As of December 31, 2024, the Company had no certificates of deposit with maturities greater than three months in marketable securities as all of the certificates of deposit held at December 31, 2023 matured during the year. The Deferred Compensation Plan assets are held in a limited rabbi trust and invested in various mutual and money market funds. As a result, the marketable securities are treated as trading securities for financial reporting purposes and are adjusted to fair value at the end of each accounting period. At the time eligible management employees (“Participants”) defer compensation or earn mandatory Company contributions, or if we were to make a discretionary contribution, we record compensation cost and a corresponding deferred compensation plan liability, which is included in accounts payable, accrued expenses, and other liabilities on our consolidated balance sheets. This liability is adjusted to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each Participant, and the impact of adjusting the liability to fair value is recorded as an increase or decrease to compensation cost. The impact of adjusting the deferred compensation plan liability to fair value and the changes in the value of the mark

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions	Acquisitions Operating Property Acquisitions During the year ended December 31, 2024, we acquired the operating property listed below from an unrelated third party. We did not acquire any operating properties during the year ended December 31, 2023. Property Date of Acquisition Number of Buildings Rentable Purchase Price (in millions) (1) 12707 & 12777 High Bluff Drive (Junction at Del Mar) September 27, 2024 2 103,731 $ 35.0 ________________________ (1) Excludes acquisition-related costs. The related assets, liabilities, and results of operations of the acquired properties are included in the consolidated financial statements as of the date of acquisition. The following table summarizes the estimated relative fair values of the assets acquired and liabilities assumed as of the date of acquisition, excluding acquisition-related costs: Total 2024 Operating Property Acquisitions (1)(2) Assets Land and improvements $ 6,000 Buildings and improvements (3) 15,703 Deferred leasing costs and acquisition-related intangible assets (4) 13,534 Prepaid expenses and other assets, net 30 Total assets acquired $ 35,267 Liabilities Acquisition-related intangible liabilities (5) $ 267 Total liabilities assumed 267 Net assets and liabilities acquired $ 35,000 ________________________ (1) As of December 31, 2024, this property was temporarily being held in a separate VIE to facilitate a potential future Section 1031 Exchange. See Note 2 “Basis of Presentation and Significant Accounting Policies” to our consolidated financial statements included in this report for additional information. (2) Excludes acquisition-related costs of $0.2 million. (3) Represents buildings, building improvements, and tenant improvements. (4) Represents in-place leases (approximately $10.5 million with a weighted average amortization period of 4.7 years), leasing commissions (approximately $2.0 million with a weighted average amortization period of 4.9 years), and an above-market lease (approximately $1.0 million with a weighted average amortization period of 4.6 years). (5) Represents below-market leases (approximately $0.3 million with a weighted average amortization period of 4.9 years). Acquisition Costs During the year ended December 31, 2024, we capitalized $0.2 million of acquisition costs. We did not capitalize any acquisition costs during the year ended December 31, 2023.

Dispositions

Dispositions	12 Months Ended
	Dec. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Dispositions	Dispositions Operating Property Dispositions We did not dispose of any operating properties during the years ended December 31, 2024 and 2023. The following table summarizes the operating property sold during the year ended December 31, 2022: Location Month of Number of Buildings Rentable Sales Price (in millions) (1) 2022 Dispositions 3130 Wilshire Boulevard, Santa Monica, CA August 1 96,085 $ 48.0 Total 2022 Dispositions 1 96,085 $ 48.0 ____________________ (1) Represents gross sales price before broker commissions, closing costs, and purchase price credits. The total gain on the sale of the operating property sold during the year ended December 31, 2022 was $17.3 million.

Marketable Securities

Marketable Securities	12 Months Ended
	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Marketable Securities Marketable securities consisted of the following at December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Deferred compensation plan assets $ 27,965 $ 28,089 Certificates of deposit (1) — 256,581 Total marketable securities $ 27,965 $ 284,670 ____________________ (1) The certificates of deposit had an original issuance term greater than three months but less than 12 months.

Receivables

Receivables	12 Months Ended
	Dec. 31, 2024
Receivables [Abstract]
Receivables	Receivables Current Receivables, net Current receivables, net is primarily comprised of contractual rents and other lease-related obligations due from tenants. The balance consisted of the following as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Current receivables $ 11,347 $ 15,176 Allowance for uncollectible tenant receivables (1) (314) (1,567) Current receivables, net $ 11,033 $ 13,609 ____________________ (1) Refer to Note 2 “Basis of Presentation and Significant Accounting Policies” for discussion of our accounting policies related to the allowance for uncollectible tenant receivables. Deferred Rent Receivables, net Deferred rent receivables, net consisted of the following as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Deferred rent receivables $ 451,996 $ 461,707 Allowance for deferred rent receivables (1) — (728) Deferred rent receivables, net $ 451,996 $ 460,979 ____________________ (1)

Deferred Leasing Costs and Acqu

Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net	Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net The following table summarizes our deferred leasing costs and acquisition-related intangible assets (acquired value of leasing costs, above-market operating leases, and in-place leases) and intangible liabilities (acquired value of below-market operating leases) as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Deferred Leasing Costs and Acquisition-related Intangible Assets, net (1) : Deferred leasing costs $ 303,541 $ 297,871 Accumulated amortization (136,171) (122,680) Deferred leasing costs, net 167,370 175,191 Above-market operating leases 1,269 260 Accumulated amortization (156) (70) Above-market operating leases, net 1,113 190 In-place leases 78,979 70,247 Accumulated amortization (21,525) (15,923) In-place leases, net 57,454 54,324 Total deferred leasing costs and acquisition-related intangible assets, net $ 225,937 $ 229,705 Acquisition-related Intangible Liabilities, net: (2) Below-market operating leases $ 38,413 $ 39,159 Accumulated amortization (10,995) (8,402) Below-market operating leases, net 27,418 30,757 Total acquisition-related intangible liabilities, net $ 27,418 $ 30,757 ____________________ (1) Refer to Note 3 “Acquisitions” for a discussion of the acquisition-related intangible assets assumed in connection with our operating property acquisition in 2024. (2) Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets. Refer to Note 3 “Acquisitions” for a discussion of the acquisition-related intangible liabilities assumed in connection with our operating property acquisition in 2024. The following table sets forth amortization related to deferred leasing costs and acquisition-related intangibles for the years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) Deferred leasing costs $ 34,135 $ 31,771 $ 31,059 Above-market operating leases 86 31 31 In-place leases 7,453 15,878 31,647 Below-market operating leases (3,607) (6,679) (10,508) Total $ 38,067 $ 41,001 $ 52,229 The following table sets forth the estimated annual amortization expense related to deferred leasing costs and acquisition-related intangibles as of December 31, 2024 for future periods: Year Ending Deferred Above-Market Operating Leases (1) In-Place Leases Below-Market Operating Leases (2) (in thousands) 2025 $ 30,699 $ 251 $ 9,057 $ (3,627) 2026 26,910 251 8,528 (3,533) 2027 23,610 251 6,976 (3,144) 2028 21,514 251 6,912 (2,962) 2029 18,855 105 5,884 (2,727) Thereafter 45,782 4 20,097 (11,425) Total $ 167,370 $ 1,113 $ 57,454 $ (27,418) ____________________ (1) Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations. (2) Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations.

Prepaid Expenses and Other Asse

Prepaid Expenses and Other Assets, Net	12 Months Ended
	Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid Expenses and Other Assets, Net	Prepaid Expenses and Other Assets, Net Prepaid expenses and other assets, net consisted of the following at December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Furniture, fixtures, and other long-lived assets, net $ 26,316 $ 37,073 Prepaid expenses and deferred financing costs, net (1) 21,162 10,532 Other assets 4,457 5,464 Total prepaid expenses and other assets, net $ 51,935 $ 53,069 ____________________ (1) Refer to Note 10 “Secured and Unsecured Debt of the Operating Partnership” for a discussion of the deferred financing costs incurred in connection with the amendment and restatement of the unsecured revolving credit facility during the year ended December 31, 2024. During the year ended December 31, 2024, the Company sold its corporate aircraft, which was included in furniture, fixtures, and other long-lived assets, net, for a sales price of $19.8 million, and recognized a gain on sale of approximately $6.0 million.

Secured and Unsecured Debt of t

Secured and Unsecured Debt of the Company	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Secured and Unsecured Debt of the Company	Secured and Unsecured Debt of the Company In this Note 9, the “Company” refers solely to Kilroy Realty Corporation and not to any of our subsidiaries. The Company itself does not hold any indebtedness. All of our secured and unsecured debt is held directly by the Operating Partnership or its subsidiaries. The Company generally guarantees all of the Operating Partnership’s unsecured debt obligations, including the unsecured revolving credit facility, the unsecured term loan facility, and all of the unsecured senior notes. At December 31, 2024 and 2023, the Operating Partnership had $4.0 billion and $4.3 billion, respectively, outstanding in total, including unamortized discounts and deferred financing costs, under these unsecured debt obligations. In addition, although the remaining $0.6 billion of the Operating Partnership’s debt as of December 31, 2024 and 2023 is secured and non-recourse to the Company, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities. Debt Covenants and Restrictions

Secured and Unsecured Debt of_2

Secured and Unsecured Debt of the Operating Partnership	12 Months Ended
	Dec. 31, 2024
Debt Instrument [Line Items]
Secured and Unsecured Debt of the Operating Partnership	Secured and Unsecured Debt of the Company In this Note 9, the “Company” refers solely to Kilroy Realty Corporation and not to any of our subsidiaries. The Company itself does not hold any indebtedness. All of our secured and unsecured debt is held directly by the Operating Partnership or its subsidiaries. The Company generally guarantees all of the Operating Partnership’s unsecured debt obligations, including the unsecured revolving credit facility, the unsecured term loan facility, and all of the unsecured senior notes. At December 31, 2024 and 2023, the Operating Partnership had $4.0 billion and $4.3 billion, respectively, outstanding in total, including unamortized discounts and deferred financing costs, under these unsecured debt obligations. In addition, although the remaining $0.6 billion of the Operating Partnership’s debt as of December 31, 2024 and 2023 is secured and non-recourse to the Company, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities. Debt Covenants and Restrictions
Kilroy Realty L.P.
Debt Instrument [Line Items]
Secured and Unsecured Debt of the Operating Partnership	Secured and Unsecured Debt of the Operating Partnership Secured Debt The following table sets forth the composition of our secured debt as of December 31, 2024 and 2023: Annual Stated Interest Rate (1) GAAP Effective Rate (1)(2) Maturity Date December 31, Type of Debt 2024 2023 (in thousands) Mortgage note payable 3.57% 3.57% December 2026 $ 152,668 $ 156,386 Mortgage note payable (3) 4.48% 4.48% July 2027 79,020 81,308 Mortgage note payable 5.90% 5.90% August 2034 375,000 375,000 Total secured debt $ 606,688 $ 612,694 Unamortized deferred financing costs (8,489) (9,469) Total secured debt, net $ 598,199 $ 603,225 ____________________ (1) All interest rates presented are fixed-rate interest rates. (2) Represents the effective interest rate including the amortization of initial issuance discounts/premiums, excluding the amortization of deferred financing costs. (3) The secured debt and the related properties that secure this debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership. The Operating Partnership’s secured debt was collateralized by operating properties with a combined net book value of approximately $795.3 million as of December 31, 2024. Although our mortgage loans are secured and non-recourse to the Company and the Operating Partnership, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities. As of December 31, 2024, all of the Operating Partnership’s secured loans contained restrictions that would require the payment of prepayment penalties for the acceleration of outstanding debt. The mortgage notes payable are secured by deeds of trust on certain of our properties and the assignment of certain rents and leases associated with those properties. Unsecured Debt Repayment of $425.0 million Unsecured Senior Notes Due 2024 During the year ended December 31, 2023, the Company completed open-market repurchases of $21.3 million of the Operating Partnership’s 3.450% $425.0 million unsecured senior notes due December 15, 2024 at a discount, leaving an aggregate remaining principal balance of $403.7 million. In December 2024, the Company repaid the aggregate remaining principal balance of $403.7 million senior notes on the maturity date. Issuance of $400.0 million Unsecured Senior Notes Due 2036 In January 2024, the Operating Partnership issued $400.0 million aggregate principal amount of unsecured senior notes in a registered public offering. The outstanding balance of the unsecured senior notes is included in unsecured debt, net of an initial issuance discount of $4.5 million, on our consolidated balance sheets. The unsecured senior notes, which are scheduled to mature on January 15, 2036, require semi-annual interest payments each January and July based on a stated annual interest rate of 6.250%. The Operating Partnership may redeem the notes at any time, either in whole or in part, subject to the payment of an early redemption premium with respect to redemptions prior to October 15, 2035. On or after October 15, 2035, the Operating Partnership may redeem the notes at any time, either in whole or in part, at par. Unsecured Senior Notes The following table summarizes the balance and significant terms of the registered unsecured senior notes issued by the Operating Partnership and outstanding, including unamortized discounts of $8.4 million and $5.3 million and unamortized deferred financing costs of $15.8 million and $15.9 million as of December 31, 2024 and 2023, respectively: Net Carrying Amount Issuance date Maturity date Stated Effective interest rate (1) 2024 2023 (in thousands) 4.300% Unsecured Senior Notes (2) July 2018 July 2026 4.300% 4.300% $ 50,000 $ 50,000 Unamortized discount and deferred financing costs (69) (113) Net carrying amount $ 49,931 $ 49,887 4.350% Unsecured Senior Notes (2) October 2018 October 2026 4.350% 4.350% $ 200,000 $ 200,000 Unamortized discount and deferred financing costs (314) (488) Net carrying amount $ 199,686 $ 199,512 3.350% Unsecured Senior Notes (3) February 2017 February 2027 3.350% 3.350% $ 175,000 $ 175,000 Unamortized discount and deferred financing costs (247) (363) Net carrying amount $ 174,753 $ 174,637 3.450% Unsecured Senior Notes (3) February 2017 February 2029 3.450% 3.450% $ 75,000 $ 75,000 Unamortized discount and deferred financing costs (176) (219) Net carrying amount $ 74,824 $ 74,781 4.270% Unsecured Senior Notes (2) April 2020 January 2031 4.270% 4.270% $ 350,000 $ 350,000 Unamortized discount and deferred financing costs (1,101) (1,282) Net carrying amount $ 348,899 $ 348,718 3.450% Unsecured Senior Notes (4) December 2017 December 2024 3.450% 3.470% $ — $ 403,712 Unamortized discount and deferred financing costs — (558) Net carrying amount $ — $ 403,154 4.375% Unsecured Senior Notes (5) September 2015 October 2025 4.375% 4.444% $ 400,000 $ 400,000 Unamortized discount and deferred financing costs (415) (969) Net carrying amount $ 399,585 $ 399,031 4.750% Unsecured Senior Notes (4) November 2018 December 2028 4.750% 4.800% $ 400,000 $ 400,000 Unamortized discount and deferred financing costs (1,973) (2,468) Net carrying amount $ 398,027 $ 397,532 4.250% Unsecured Senior Notes (6) July 2014 August 2029 4.250% 4.350% $ 400,000 $ 400,000 Unamortized discount and deferred financing costs (2,439) (2,971) Net carrying amount $ 397,561 $ 397,029 3.050% Unsecured Senior Notes (6) September 2019 February 2030 3.050% 3.064% $ 500,000 $ 500,000 Unamortized discount and deferred financing costs (3,036) (3,629) Net carrying amount $ 496,964 $ 496,371 2.500% Unsecured Senior Notes (7) August 2020 November 2032 2.500% 2.560% $ 425,000 $ 425,000 Unamortized discount and deferred financing costs (4,201) (4,735) Net carrying amount $ 420,799 $ 420,265 2.650% Unsecured Senior Notes (7) October 2021 November 2033 2.650% 2.654% $ 450,000 $ 450,000 Unamortized discount and deferred financing costs (3,075) (3,422) Net carrying amount $ 446,925 $ 446,578 6.250% Unsecured Senior Notes (8) January 2024 January 2036 6.250% 6.385% $ 400,000 $ — Unamortized discount and deferred financing costs (7,159) — Net carrying amount $ 392,841 $ — Total Unsecured Senior Notes, Net $ 3,800,795 $ 3,807,495 ____________________ (1) Represents the effective interest rate including the amortization of initial issuance discounts, excluding the amortization of deferred financing costs. (2) Interest on these notes is payable semi-annually in arrears on April 18th and October 18th of each year. (3) Interest on these notes is payable semi-annually in arrears on February 17th and August 17th of each year. (4) Interest on these notes is payable semi-annually in arrears on June 15th and December 15th of each year. (5) Interest on these notes is payable semi-annually in arrears on April 1st and October 1st of each year. (6) Interest on these notes is payable semi-annually in arrears on February 15th and August 15th of each year. (7) Interest on these notes is payable semi-annually in arrears on May 15th and November 15th of each year. (8) Interest on these notes is payable semi-annually in arrears on January 15th and July 15th of each year. Unsecured Revolving Credit Facility and Term Loan Facility In March 2024, the Operating Partnership amended and restated the terms of its unsecured revolving credit facility. The amendment and restatement maintained the $1.1 billion borrowing capacity and extended the maturity date of the unsecured revolving credit facility to July 31, 2028. The following table summarizes the balance and terms of our unsecured revolving credit facility as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Outstanding borrowings $ — $ — Remaining borrowing capacity (1) 1,100,000 1,100,000 Total borrowing capacity (1) $ 1,100,000 $ 1,100,000 Interest rate (2) 5.69 % 6.38 % Facility fee-annual rate (3) 0.250% 0.200% Maturity date (4) July 31, 2028 July 31, 2025 ____________________ (1) Remaining and total borrowing capacity are further reduced by the amount of our outstanding letters of credit which total approximately $5.2 million as of December 31, 2024 and December 31, 2023. 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 pursuant to the terms of the unsecured revolving credit facility. (2) Our unsecured revolving credit facility interest rate was calculated using the Secured Overnight Financing Rate (“SOFR”) plus a SOFR adjustment of 0.10% (“Adjusted SOFR”) and a margin of 1.100% and 0.900% based on our credit rating as of December 31, 2024 and 2023, respectively. We may be entitled to a temporary 0.01% reduction in the interest rate provided we meet certain sustainability goals with respect to the ongoing reduction of greenhouse gas emissions. (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 in connection with the amendment and restatement of the unsecured revolving credit facility. As of December 31, 2024 and 2023, $12.7 million and $3.2 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 maturity date of our unsecured revolving credit facility. (4) The maturity date may be extended by two six-month periods, at the Operating Partnership’s election. The Operating Partnership intends to borrow under the unsecured revolving credit facility from time to time for general corporate purposes, including to finance development and redevelopment expenditures, to fund potential acquisitions, to repay long-term debt, and to supplement cash balances in response to market conditions. In connection with amending and restating the unsecured revolving credit facility, the Operating Partnership repaid $200.0 million of its existing $520.0 million unsecured term loan facility (the “2022 Term Loan Facility”) and extended the maturity date on $200.0 million of the remaining $320.0 million principal balance by 12 months to October 3, 2025 (the “2024 Term Loan Facility”). The following table summarizes the balance and terms of our 2024 Term Loan Facility as of December 31, 2024: 2024 Term Loan Facility December 31, 2024 (in thousands) Outstanding borrowings $ 200,000 Remaining borrowing capacity — Total borrowing capacity (1) $ 200,000 Interest rate (2) 5.70 % Maturity date (3) October 3, 2025 ____________________ (1) We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $130.0 million as of December 31, 2024, under an accordion feature pursuant to the terms of the 2024 Term Loan Facility. (2) Our 2024 Term Loan Facility interest rate was calculated using Adjusted SOFR plus a margin of 1.200% based on our credit rating as of December 31, 2024. Additionally, we incurred debt origination and legal costs in connection with the amendment and restatement of the unsecured revolving credit facility. As of December 31, 2024, $1.2 million of unamortized deferred financing costs, inclusive of unamortized initial issuance costs transferred from the 2022 Term Loan Facility, remained to be amortized through the maturity date of the 2024 Term Loan Facility. (3) The maturity date may be extended by two 12-month periods, at the Operating Partnership’s election. In September 2024, the Operating Partnership repaid the remaining $120.0 million outstanding on its 2022 Term Loan Facility. The following table summarizes the balance and terms of our 2022 Term Loan Facility as of December 31, 2023: 2022 Term Loan Facility December 31, 2023 (in thousands) Outstanding borrowings $ 520,000 Remaining borrowing capacity — Total borrowing capacity $ 520,000 Interest rate (1) 6.41 % Undrawn facility fee-annual rate (2) 0.200% Maturity date October 3, 2024 ____________________ (1) Our 2022 Term Loan Facility interest rate was calculated using Adjusted SOFR plus a margin of 0.950% based on our credit rating as of December 31, 2023. (2) Our undrawn facility fee was paid on a quarterly basis and was calculated based on the remaining borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs. As of December 31, 2023, $2.3 million of unamortized deferred financing costs remained to be amortized through the maturity date of our 2022 Term Loan Facility. Debt Covenants and Restrictions The unsecured revolving credit facility, unsecured term loan 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 maximum ratio of secured debt to total asset value, 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 were in compliance with all of our financial covenants as of December 31, 2024 and 2023. Debt Maturities The following table summarizes the stated debt maturities and scheduled amortization payments for all outstanding debt as of December 31, 2024: Year (in thousands) 2025 $ 606,246 2026 401,317 2027 249,125 2028 400,000 2029 475,000 Thereafter 2,500,000 Total aggregate principal value (1) $ 4,631,688 ________________________ (1) Includes gross principal balance of outstanding debt before the effect of the following at December 31, 2024: $25.5 million of unamortized deferred financing costs for the unsecured term loan facility, unsecured senior notes, and secured debt, and $8.4 million of unamortized discounts for the unsecured senior notes. Excludes unamortized deferred financing costs on the unsecured revolving credit facility, which are included in prepaid expenses and other assets, net on our consolidated balance sheets. Capitalized Interest and Loan Fees The following table sets forth our gross interest expense and capitalized interest for the years ended December 31, 2024, 2023, and 2022. 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. Year Ended December 31, 2024 2023 2022 (in thousands) Gross interest expense $ 227,748 $ 192,983 $ 161,761 Capitalized interest (82,461) (78,767) (77,483) Interest expense $ 145,287 $ 114,216 $ 84,278

Deferred Revenue and Acquisitio

Deferred Revenue and Acquisition-Related Intangible Liabilities, net	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Deferred Revenue and Acquisition-Related Intangible Liabilities, net	Deferred Revenue and Acquisition-Related Intangible Liabilities, net Deferred revenue and acquisition-related intangible liabilities, net consisted of the following at December 31, 2024 and 2023: December 31, 2024 2023 (in thousands) Deferred revenue related to tenant-funded tenant improvements $ 81,738 $ 97,802 Other deferred revenue 33,281 45,079 Acquisition-related intangible liabilities, net (1) 27,418 30,757 Total $ 142,437 $ 173,638 _____________________ (1) See Note 7 “Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net” for additional information regarding our acquisition-related intangible liabilities. Deferred Revenue Related to Tenant-funded Tenant Improvements During the years ended December 31, 2024, 2023, and 2022, $19.1 million, $20.7 million, and $19.3 million, respectively, of deferred revenue related to tenant-funded tenant improvements was amortized and recognized as rental income. The following is the estimated amortization of deferred revenue related to tenant-funded tenant improvements as of December 31, 2024 for the next five years and thereafter: Year Ending (in thousands) 2025 $ 14,758 2026 12,754 2027 10,727 2028 9,821 2029 9,099 Thereafter 24,579 Total $ 81,738

Noncontrolling Interests on the

Noncontrolling Interests on the Company’s Consolidated Financial Statements	12 Months Ended
	Dec. 31, 2024
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 December 31, 2024 and 2023. The remaining approximate 1.0% common limited partnership interest as of December 31, 2024 and 2023 was owned by non-affiliated investors and a former executive officer and director in the form of noncontrolling common units. There were 1,150,574 common units outstanding held by these investors and a former executive officer and director as of December 31, 2024 and 2023. 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 $0.01 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 $46.8 million and $47.0 million as of December 31, 2024 and 2023, 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 generally expected 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. Noncontrolling Interest in Consolidated Property Partnerships In August 2016, the Operating Partnership entered into agreements with Norges Bank Investment Management (“NBIM”) whereby NBIM made contributions, through two REIT subsidiaries, for a 44% common equity interest in two existing companies that owned the Company’s 100 First Street and 303 Second Street office properties located in San Francisco, California. The transactions did not meet the criteria to qualify as sales of real estate because the Company continues to effectively control the properties and therefore continued to account for the 100 First Street and 303 Second Street office properties on a consolidated basis in its financial statements. At formation, the Company accounted for the transactions as equity transactions and recognized noncontrolling interests in its consolidated balance sheets. The noncontrolling interests in 100 First LLC and 303 Second LLC as of December 31, 2024 and 2023 were $169.4 million and $173.7 million, respectively. The remaining amount of noncontrolling interests in consolidated property partnerships represents the third party equity interest in Redwood LLC. This noncontrolling interest was $4.9 million and $4.6 million as of December 31, 2024 and 2023, respectively.

Noncontrolling Interests on t_2

Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements	12 Months Ended
	Dec. 31, 2024
Noncontrolling Interest [Line Items]
Noncontrolling Interests on the Operating Partnership’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 December 31, 2024 and 2023. The remaining approximate 1.0% common limited partnership interest as of December 31, 2024 and 2023 was owned by non-affiliated investors and a former executive officer and director in the form of noncontrolling common units. There were 1,150,574 common units outstanding held by these investors and a former executive officer and director as of December 31, 2024 and 2023. 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 $0.01 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 $46.8 million and $47.0 million as of December 31, 2024 and 2023, 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 generally expected 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. Noncontrolling Interest in Consolidated Property Partnerships In August 2016, the Operating Partnership entered into agreements with Norges Bank Investment Management (“NBIM”) whereby NBIM made contributions, through two REIT subsidiaries, for a 44% common equity interest in two existing companies that owned the Company’s 100 First Street and 303 Second Street office properties located in San Francisco, California. The transactions did not meet the criteria to qualify as sales of real estate because the Company continues to effectively control the properties and therefore continued to account for the 100 First Street and 303 Second Street office properties on a consolidated basis in its financial statements. At formation, the Company accounted for the transactions as equity transactions and recognized noncontrolling interests in its consolidated balance sheets. The noncontrolling interests in 100 First LLC and 303 Second LLC as of December 31, 2024 and 2023 were $169.4 million and $173.7 million, respectively. The remaining amount of noncontrolling interests in consolidated property partnerships represents the third party equity interest in Redwood LLC. This noncontrolling interest was $4.9 million and $4.6 million as of December 31, 2024 and 2023, respectively.
Kilroy Realty L.P.
Noncontrolling Interest [Line Items]
Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements	Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements Consolidated Property Partnerships In August 2016, the Operating Partnership entered into agreements with NBIM whereby NBIM made contributions, through two REIT subsidiaries, for a 44% common equity interest in two existing companies that owned the Company’s 100 First Street and 303 Second Street office properties located in San Francisco, California. Refer to Note 12 for additional information regarding these consolidated property partnerships.

Stockholders' Equity of the Com

Stockholders' Equity of the Company	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Stockholders' Equity of the Company	Stockholders’ Equity of the Company Common Stock At-The-Market Stock Offering Program In March 2024, the Company terminated its at-the-market (“ATM”) stock offering program (the “2018 ATM Program”) and commenced a new at-the-market stock offering program (the “2024 ATM Program”), under which we may currently 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 the 2024 ATM Program, the Company may also, at its discretion, enter into forward equity sale agreements. The use of forward equity sale agreements allows the Company to lock in a share price on the sale of shares of our common stock at the time an 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 complete any sales of common stock under either program during the years ended December 31, 2024 and 2023. Common Stock Repurchases In February 2024, the Company’s Board of Directors approved a new share repurchase program (the “Share Repurchase Program”) that authorizes the repurchase of shares of the Company’s common stock having an aggregate gross purchase price of up to $500.0 million. The Share Repurchase Program supersedes and replaces the Company’s previous share repurchase program. Under the Share Repurchase Program, repurchases may be made from time to time using a variety of methods, which may include open market purchases and privately negotiated transactions. The specific timing, price, and size of purchases will depend on prevailing stock prices, general economic and market conditions, and other considerations. The Share Repurchase Program does not have a termination date and repurchases may be discontinued at any time. As of December 31, 2024, 4,935,826 shares remained eligible for repurchase under the Share Repurchase Program. The Company did not repurchase any common stock under the Share Repurchase Program during the year ended December 31, 2024 and did not repurchase any common stock under the previous share repurchase program approved by the Company’s Board of Directors in 2016 during the years ended December 31, 2023 and 2022. Accrued Dividends and Distributions The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock and noncontrolling units as of December 31, 2024 and 2023: December 31, 2024 2023 (in thousands) Dividends and Distributions payable to: Common stockholders $ 63,745 $ 63,309 Noncontrolling common unitholders of the Operating Partnership 621 621 RSU holders (1) 484 510 Total accrued dividends and distribution to common stockholders and noncontrolling unitholders $ 64,850 $ 64,440 _____________________ (1) The amount includes the value of the dividend equivalents that will be paid with additional RSUs (see Note 16 “Share-Based and Other Compensation” for additional information). December 31, 2024 2023 Outstanding Shares and Units: Common stock 118,046,674 117,239,558 Noncontrolling common units 1,150,574 1,150,574 RSUs (1) 861,385 908,336 _____________________ (1) The amount includes nonvested RSUs. Does not include 828,442 and 1,083,086 market measure-based RSUs because not all the necessary performance conditions have been met as of December 31, 2024 and 2023, respectively. Refer to Note 16 “Share-Based and Other Compensation” for additional information.

Partners' Capital of the Operat

Partners' Capital of the Operating Partnership	12 Months Ended
	Dec. 31, 2024
Partners' Capital [Abstract]
Partners' Capital of the Operating Partnership	Partners’ Capital of the Operating Partnership Common Units 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 a former executive officer and director in the form of common limited partner units as well as the ownership interest held on each respective date: December 31, 2024 December 31, 2023 Company owned common units in the Operating Partnership 118,046,674 117,239,558 Company owned general partnership interest 99.0 % 99.0 % Non-affiliated investors and other common units of the Operating Partnership 1,150,574 1,150,574 Ownership interest of limited partnership interests 1.0 % 1.0 % For a further discussion of the redemption features of the common units not owned by the Company as of December 31, 2024 and 2023, refer to Note 12 “Noncontrolling Interests on the Company’s Consolidated Financial Statements.” Accrued Distributions The following tables summarize accrued distributions for the noted common units as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Distributions payable to: General partner $ 63,745 $ 63,309 Common limited partners 621 621 RSU holders (1) 484 510 Total accrued distributions to common unitholders $ 64,850 $ 64,440 _____________________ (1) The amount includes the value of the dividend equivalents that will be paid with additional RSUs (see Note 16 “Share-Based and Other Compensation” for additional information). December 31, 2024 December 31, 2023 Outstanding Units: Common units held by the general partner 118,046,674 117,239,558 Common units held by the limited partners 1,150,574 1,150,574 RSUs (1) 861,385 908,336 _____________________ (1)

Share-Based and Other Compensat

Share-Based and Other Compensation	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Share-Based and Other Compensation	Share-Based and Other Compensation Stockholder Approved Share-Based Incentive Compensation Plan As of December 31, 2024, 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 12.6 million shares of our common stock for possible issuance under our 2006 Plan. As of December 31, 2024, approximately 2.6 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. The Executive Compensation Committee of the Company’s Board of Directors (the “Executive Compensation Committee”) may grant the following share-based awards to eligible individuals, as provided under the 2006 Plan: incentive stock options, nonqualified stock options, restricted stock (nonvested shares), stock appreciation rights, performance shares, performance stock units, dividend equivalents, stock payments, deferred stock, restricted stock units (“RSUs”), profit interest units, performance bonus awards, performance-based awards, and other incentive awards. For each award granted under our share-based incentive compensation programs, the Operating Partnership simultaneously issues to the Company a number of common units equal to the number of shares of common stock ultimately paid by the Company in respect of such awards. The Executive Compensation Committee generally grants awards to certain officers of the Company under the 2006 Plan annually in January and/or February of RSUs that are subject to market and/or performance-based vesting requirements and RSUs that are subject to time-based vesting requirements. Executive Transitions On March 30, 2023, John Kilroy, the then Chairman of the Board of Directors and Chief Executive Officer (“CEO”) of the Company and the Operating Partnership, our “former CEO”, announced his retirement effective December 31, 2023, which was subsequently deferred to January 21, 2024 (the “Retirement Date”). Additionally, as previously disclosed, the Company and our former President entered into a separation agreement in 2022 under which he continued to serve as an officer of the Company until the scheduled expiration date of his employment agreement on March 1, 2023. For our former CEO, the vesting of all unvested share-based compensation awards was accelerated through the Retirement Date and the final number of restricted stock units (“RSUs”) subject to market and/or performance-based vesting requirements vested was based upon a shortened performance period ending on the Retirement Date. Share-based compensation expense for these awards was recognized based on the actual achievement of market and/or performance-based vesting requirements for the shortened performance periods. For our former President, the vesting of all unvested share-based compensation awards was accelerated through March 1, 2023 and the final number of RSUs earned that were subject to market and/or performance-based vesting requirements was based upon the actual achievement of the market and/or performance conditions for a shortened performance period ended on March 1, 2023. For the year ended December 31, 2023, we recognized $27.3 million of stock compensation expense related to the accelerated vesting of awards for our former CEO and former President. On January 21, 2024, John Kilroy retired as the Company’s CEO while remaining Chair and a member of the Board of Directors through May 22, 2024. On January 22, 2024, Angela Aman joined the Company as CEO and a member of the Board of Directors and was granted 101,627 Time-Based Restricted Stock Units (“RSUs”) with a one-year vesting period. On July 30, 2024, the Company’s Board of Directors appointed Jeffrey Kuehling to serve as Executive Vice President, Chief Financial Officer (“CFO”), effective August 19, 2024, and he was granted 20,373 Time-Based RSUs with a 1.4-year vesting period. In connection with Mr. Kuehling’s appointment as CFO, Eliott Trencher will continue to serve as the Company’s Executive Vice President, Chief Investment Officer. 2024, 2023, and 2022 Annual Performance-Based RSU Grants During each of the three years in the period ended December 31, 2024, the Executive Compensation Committee granted awards to certain officers of the Company under the 2006 Plan that are subject to market and/or performance-based vesting requirements (“Performance-Based RSUs”). The Performance-Based RSUs are scheduled to vest at the end of a three year period consisting of calendar years 2024-2026, 2023-2025, and 2022-2024 for the awards granted during the years ended December 31, 2024, 2023, and 2022, respectively. A target number of Performance-Based RSUs were awarded, and the final number of Performance-Based RSUs that vest (which may be more or less than the target number) will be based upon (i) during the first calendar year of the respective awards’ 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 (ii) a performance measure that applies to 50% of the award based upon a measure of the Company’s average net debt to EBITDA ratio for the three year performance period (the “Net 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 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 Performance-Based RSUs ultimately earned could fluctuate from the target number of Performance-Based RSUs granted based upon the levels of achievement for the FFO Performance Condition, the Net 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 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. Compensation expense for the Performance-Based RSU grants are recognized on a straight-line basis over the requisite service period for each participant, which is generally the three year service period, except for our former CEO, whose compensation expense was recognized on an accelerated basis in 2023 due to clauses that rendered a portion of the vesting conditions to be non-substantive and accelerated through his Retirement Date. The 2024 FFO Performance Condition was achieved at 175% of target for one participant and 150% of target for all other participants. The 2023 FFO Performance Condition was achieved at 150% of target for all participants. The number of 2024 and 2023 Performance-Based RSUs ultimately earned could fluctuate from the target number of Performance-Based RSUs granted during 2024 and 2023 based upon the levels of achievement for the Net 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 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. The 2022 Performance-Based RSUs completed the performance measurement period and based on the combined results of the 2022 FFO Performance Condition, the Net Debt to EBITDA Ratio Performance Condition, and the Market Condition, the 2022 Performance-Based RSUs achieved at 183.75% of target for all participants. Each 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 applicable performance and market conditions. The fair values for the awards with market conditions were calculated using a Monte Carlo simulation pricing model based on the assumptions in the table below. The determination of the fair value of the 2024, 2023, and 2022 Performance-Based RSUs takes into consideration the likelihood of achievement of the 2024, 2023, and 2022 Market Condition and the share price on the grant date of the 2024, 2023, and 2022 Performance-Based RSUs, respectively, as discussed above. The following table summarizes the estimated number of RSUs earned for the 2024 and 2023 Performance-Based RSUs and the actual number of RSUs earned for the 2022 Performance-Based RSUs and the assumptions utilized in the Monte Carlo simulation pricing models: 2024 2023 2022 Service vesting period February 1, 2024 - January, 2027 February 6, 2023 - January, 2026 January 28, 2022 - January, 2025 Target RSUs granted 265,205 300,007 193,111 Estimated RSUs earned (1)(2) 416,451 705,267 396,736 Fair Value Assumptions: Valuation date February 1, 2024 February 6, 2023 January 28, 2022 Fair value on valuation date (in millions) $9.5 $12.0 $12.7 Fair value per share on valuation date (3) $36.00 $40.10 $67.62 Expected share price volatility 34.0 % 35.0 % 36.0 % Risk-free interest rate 3.98 % 4.12 % 1.35 % _____________________ (1) Estimated RSUs earned for the 2024 Performance-Based RSUs are based on the actual achievement of the 2024 FFO Performance Condition and assumes the target level of achievement for the 2024 Net Debt to EBITDA Ratio Performance Condition and the target level of achievement of the 2024 Market Condition. Estimated RSUs earned for the 2023 Performance-Based RSUs are based on the actual achievement of the 2023 FFO Performance Condition and assume target level achievement of the 2023 Market Condition and maximum level of achievement of the 2023 Net Debt to EBITDA Ratio Performance Condition. The 2022 Performance-Based RSUs earned are based on actual performance of the 2022 Performance Conditions and the 2022 Market Condition. (2) For one participant, the 2022 and 2023 Market Condition is based on actual performance through the accelerated vesting of January 21, 2024. (3) For one participant, the fair value per share on the valuation date for their 2024, 2023, and 2022 Performance-Based RSUs is $36.43, $40.43 and $70.00, respectively. 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 Summary of Performance and Market-Measure Based RSUs A summary of our performance and market-measure based RSU activity from January 1, 2024 through December 31, 2024 is presented below: Nonvested RSUs Vested RSUs Total RSUs Amount Weighted-Average Outstanding at January 1, 2024 1,083,086 $ 52.47 23,583 1,106,669 Granted 416,451 35.67 354,542 770,993 Vested (702,187) 53.39 702,187 — Settled (1) — — (1,032,183) (1,032,183) Issuance of dividend equivalents (2) 48,673 34.67 33,150 81,823 Canceled (17,581) 38.64 (5) (17,586) Outstanding as of December 31, 2024 (3) 828,442 $ 42.49 81,274 909,716 ____________________ (1) Represents vested RSUs that were settled in shares of the Company’s common stock. Total shares settled include 517,475 shares, primarily for one participant, that were tendered in accordance with the terms of the 2006 Plan to satisfy minimum statutory tax withholding requirements related to the RSUs settled. We accept the return of RSUs at the current quoted closing share price of the Company’s common stock to satisfy tax obligations. (2) Represents the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreement. (3) Outstanding RSUs as of December 31, 2024 represent the actual achievement of the FFO performance conditions and assumes target levels for the market and other performance conditions. The number of restricted stock units ultimately earned is subject to change based upon actual performance over the three-year vesting period. Dividend equivalents earned will vest along with the underlying award and are also subject to changes based on the number of RSUs ultimately earned for each underlying award. A summary of our performance and market-measure based RSU activity for the years ended December 31, 2024, 2023, and 2022 is presented below: RSUs Granted RSUs Vested Years ended December 31, Non-Vested RSUs Granted (1) Weighted-Average Vested RSUs Total Vest-Date 2024 416,451 $ 35.67 (1,089,879) $ 38,364 2023 483,113 $ 39.65 (290,570) $ 11,105 2022 310,484 $ 63.05 (241,184) $ 15,200 ____________________ (1) Non-vested RSUs granted are based on the actual achievement of the FFO performance conditions and assumes target level achievement for the market and other performance conditions. Annual 2024, 2023, and 2022 Time-Based RSU Grants During each of the three years in the period ended December 31, 2024, the Executive Compensation Committee granted awards to certain officers of the Company under the 2006 Plan that are subject to time-based vesting requirements (“Time-Based RSUs”). The annual Time-Based RSUs are scheduled to vest in three equal annual installments over the periods listed below. Compensation expense for the annual 2024, 2023, and 2022 Time-Based RSUs is recognized on a straight-line basis over the requisite service period, which is generally the explicit service period. However, our former CEO had a shorter service period for his 2023 and 2022 Time-Based RSUs due to clauses that render a portion of the vesting conditions to be non-substantive as well as the accelerated vesting of these awards through his Retirement Date. Each 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 fair value of the Time-Based RSUs is based on the Company’s closing share price on the NYSE on the respective fair valuation dates as detailed in the table below: 2024 Time-Based RSU Grant (1) 2023 Time-Based RSU Grant 2022 Time-Based RSU Grant Service vesting period February 1, 2024 - January 5, 2027 February 6, 2023 - January 5, 2026 January 28, 2022 - January 5, 2025 RSUs granted 236,389 217,059 158,170 Fair value on valuation date (in millions) $ 8.3 $ 8.6 $ 10.0 Weighted average fair value per share $ 35.20 $ 39.65 $ 63.05 Date of valuation February 1, 2024 February 6, 2023 January 28, 2022 ____________________ (1) Excludes initial Time-Based RSUs granted to the Company’s current CEO and CFO in 2024, as mentioned above. Summary of Time-Based RSUs A summary of our time-based RSU activity from January 1, 2024 through December 31, 2024 is presented below: Nonvested RSUs Vested RSUs Total RSUs Amount Weighted Average Outstanding at January 1, 2024 401,310 $ 43.86 483,443 884,753 Granted 385,718 36.12 — 385,718 Vested (250,952) 47.15 250,952 — Settled (1) — — (516,154) (516,154) Issuance of dividend equivalents (2) 28,519 32.97 30,216 58,735 Forfeited (27,169) 40.42 — (27,169) Canceled (3) — — (5,772) (5,772) Outstanding as of December 31, 2024 537,426 $ 36.37 242,685 780,111 ____________________ (1) Represents vested RSUs that were settled in shares of the Company’s common stock. Total shares settled include 229,447 shares, primarily for one participant, that were tendered in accordance with the terms of the 2006 Plan to satisfy minimum statutory tax withholding requirements related to the RSUs settled. We accept the return of RSUs at the current quoted closing share price of the Company’s common stock to satisfy tax obligations. (2) Represents the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreement. (3) For shares vested but not yet settled, we accept the return of RSUs at the current quoted closing share price of the Company’s common stock to satisfy minimum statutory tax-withholding requirements related to either the settlement or vesting of RSUs in accordance with the terms of the 2006 Plan. A summary of our time-based RSU activity for the years ended December 31, 2024, 2023, and 2022 is presented below: RSUs Granted RSUs Vested Year ended December 31, Non-Vested Weighted-Average Grant Date Vested RSUs Total Vest-Date Fair Value (1) (in thousands) 2024 385,718 $ 36.12 (281,168) $ 10,878 2023 247,017 $ 38.12 (343,334) $ 12,425 2022 177,099 $ 62.58 (294,867) $ 19,890 ____________________ (1) Total fair value of RSUs vested was calculated based on the quoted closing share price of the Company’s common stock on the NYSE on the day of vesting. Excludes the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreement. Share-Based Compensation Cost Recorded During the Period The total compensation cost for all share-based compensation programs was $24.4 million, $43.7 million, and $34.8 million for the years ended December 31, 2024, 2023, and 2022, respectively. Share-based compensation costs for the year ended December 31, 2023 includes $27.3 million

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans 401(k) Plan We have a retirement savings plan designed to qualify under Section 401(k) of the Code (the “401(k) Plan”). Our employees are eligible to participate in the 401(k) Plan on the first day of the month after three months of service. The 401(k) Plan allows eligible employees (“401(k) Participants”) to defer up to 60% of their eligible compensation on a pre-tax basis, subject to certain maximum amounts allowed by the Code. The 401(k) Plan provides for a matching contribution by the Company in an amount equal to 50 cents of each one dollar of participant contributions up to a maximum of 10% of the 401(k) Participant’s annual salary. 401(k) Participants vest immediately in the amounts contributed by us. For each of the years ended December 31, 2024, 2023, and 2022, we contributed $1.8 million, $1.7 million, and $1.6 million, respectively, to the 401(k) Plan. Deferred Compensation Plan In 2007, we adopted the Deferred Compensation Plan, under which directors and certain management employees may defer receipt of their compensation, including up to 70% of their salaries and up to 100% of their director fees and bonuses, as applicable. In addition, certain employee participants receive mandatory Company contributions to their Deferred Compensation Plan accounts equal to 10% of their gross monthly salaries, without regard to whether such employees elect to defer salary or bonus compensation under the Deferred Compensation Plan. Our Board may, but has no obligation to, approve additional discretionary contributions by the Company to Participant accounts. We hold the Deferred Compensation Plan assets in a limited rabbi trust, which is subject to the claims of our creditors in the event of bankruptcy or insolvency. See Note 20 “Fair Value Measurements and Disclosures” for further discussion of our Deferred Compensation Plan assets as of December 31, 2024 and 2023. Our liability of $27.4 million and $25.0 million under the Deferred Compensation Plan was fully funded as of December 31, 2024 and 2023, respectively.

Rental Income and Future Minimu

Rental Income and Future Minimum Rent	12 Months Ended
	Dec. 31, 2024
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 generally 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 sales. The table below sets forth the allocation of rental income between fixed and variable payments and net collectability reversals for the years ended December 31, 2024 and 2023: Year Ended December 31, 2024 2023 Fixed lease payments $ 923,029 $ 944,618 Variable lease payments 197,502 184,672 Net collectability reversals (1) (2,416) (11,553) Total rental income $ 1,118,115 $ 1,117,737 ____________________ (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 moved to / restored from a cash basis of revenue recognition and allowances for uncollectible receivables. We have operating leases with tenants that expire at various dates through 2049 and may be subject to scheduled fixed increases and future renewal options. 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 December 31, 2024 for future periods is summarized as follows: Year Ending (in thousands) 2025 $ 819,139 2026 787,062 2027 742,917 2028 703,798 2029 614,718 Thereafter 1,608,063 Total (1) $ 5,275,697 ____________________ (1) Excludes residential leases and leases with a term of one year or less.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies General As of December 31, 2024, we had commitments of approximately $170.9 million, excluding our ground lease commitments, for contracts and executed leases directly related to our operating and development and redevelopment properties. Ground Leases The following table summarizes our properties that are held subject to long-term non-cancellable ground lease obligations as of December 31, 2024 and the respective contractual expiration dates: Property Contractual Expiration Date 701, 801, and 837 N. 34th Street, Seattle, WA (1) December 2041 1701 Page Mill Road and 3150 Porter Drive, Palo Alto, CA December 2067 Kilroy Airport Center Phases I, II, and III, Long Beach, CA (2) July 2084 3243 S. La Cienega Boulevard, Los Angeles, CA October 2106 200 W. 6th Street, Austin, TX December 2112 ____________________ (1) The Company has three 10-year and one 45-year extension options for this Seattle ground lease, which if exercised would extend the expiration date to December 2116. These extension options are not assumed to be exercised in our calculation of the present value of the future minimum lease payments for this lease. The Company also has a purchase option for this ground lease. (2) Assumes the impact of all extension options held by the Company. To determine the discount rates used to calculate the present value of the minimum future lease payments for our ground leases, we used a hypothetical curve derived from unsecured corporate borrowing rates over the lease term. The weighted average discount rate used to determine the present value of our minimum lease payments was 4.67%. As of December 31, 2024, the weighted average remaining lease term of our ground leases is 62 years. For the years ended December 31, 2024, 2023, and 2022, variable lease costs totaling $4.7 million, $4.0 million , and $3.6 million, respectively, were recorded to ground leases expense on our consolidated statements of operations. The minimum commitment under our ground leases as of December 31, 2024 for future periods is as follows: Year Ending (in thousands) 2025 $ 6,772 2026 6,809 2027 6,850 2028 6,869 2029 6,869 Thereafter 367,744 Total undiscounted cash flows (1)(2)(3)(4)(5)(6) $ 401,913 Present value discount (273,491) Ground lease liabilities $ 128,422 ________________________ (1) Excludes contingent future rent payments based on gross income or adjusted gross income and reflects the minimum obligations under the ground leases including any extension options (but excludes the Seattle ground lease extension options). (2) Our 701, 801 and 837 N. 34th Street ground lease obligation is subject to a fair market value adjustment every five years. The contractual obligations for that lease included above assume the current annual ground lease obligation in effect at December 31, 2024 for the remainder of the lease term, as we cannot predict future adjustments. (3) Our Kilroy Airport Center Phases I, II, and III ground lease obligation is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals limited to maximum increases annually. The contractual obligations for that lease included above assume the contractual minimum annual rent prior to the consideration of any variable rental payments in effect at December 31, 2024 for the remainder of the lease term, as we cannot predict future adjustments. (4) Our 1701 Page Mill Road and 3150 Porter Drive ground lease obligation includes a component that is based on the percentage of adjusted gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every 10 years by an amount equal to 60% of the average annual percentage rent for the previous three years. The contractual obligations for this lease included above assume the current annual ground lease obligation in effect at December 31, 2024 for the remainder of the lease term, as we cannot predict future adjustments. (5) Our 3243 S. La Cienega Boulevard ground lease obligation is subject to fixed 5% ground rent increases every five years, with the next increase occurring on November 1, 2027. (6) Our 200 W. 6th Street ground lease obligation is subject to fixed 2% ground rent increases every year, with ground rent resets occurring every ten years based on CPI. The contractual obligations for that lease included above assume increases for the remaining current ten-year period based on the contractual minimum annual rent prior to the consideration of any variable rental payments in effect at December 31, 2024. Environmental Matters We follow the policy of evaluating all of our properties, including acquisition, development and 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 flows, or that we believe would require additional disclosure or the recording of a loss contingency. As of December 31, 2024 and 2023, we had accrued environmental remediation liabilities of approximately $72.0 million and $76.6 million, respectively, 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 December 31, 2024 and 2023 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. Litigation We and our properties are subject to litigation arising in the ordinary course of business. To our knowledge, neither we nor any of our properties are presently subject to any litigation or threat of litigation which, if determined unfavorably to us, would have a material adverse effect on our cash flows, financial condition, or results of operations. Insurance

Fair Value Measurements and Dis

Fair Value Measurements and Disclosures	12 Months Ended
	Dec. 31, 2024
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 a recurring basis in our consolidated financial statements are the marketable securities related to our Deferred Compensation Plan (see Note 17 “Employee Benefit Plans” for additional information). The following table sets forth the fair value of our Deferred Compensation Plan assets as of December 31, 2024 and 2023: Fair Value (Level 1) (1) 2024 2023 Description (in thousands) Deferred Compensation Plan assets (2) $ 27,965 $ 28,089 ____________________ (1) Based on quoted prices in active markets for identical securities. (2) The Deferred Compensation Plan assets 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 December 31, 2024 and 2023: December 31, 2024 2023 Carrying Value Fair Value (1) Carrying Value Fair Value (1) (in thousands) Assets Certificates of deposit (2) $ — $ — $ 256,581 $ 256,581 Liabilities Secured debt, net $ 598,199 $ 569,061 $ 603,225 $ 585,826 Unsecured debt, net 3,999,566 3,681,914 4,325,153 3,927,104 _______________ (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. (2)

Net Income Available to Common

Net Income Available to Common Stockholders Per Share of the Company	12 Months Ended
	Dec. 31, 2024
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 years ended December 31, 2024, 2023, and 2022: Year Ended December 31, 2024 2023 2022 (in thousands, except unit and per unit amounts) Numerator: Net income available to common stockholders $ 210,969 $ 212,241 $ 232,615 Allocation to participating securities (1) (1,967) (1,233) (1,272) Numerator for basic and diluted net income available to common stockholders $ 209,002 $ 211,008 $ 231,343 Denominator: Basic weighted average vested shares outstanding 117,649,111 117,160,173 116,806,575 Effect of dilutive securities 507,876 346,082 413,472 Diluted weighted average vested shares and common stock equivalents outstanding 118,156,987 117,506,255 117,220,047 Basic earnings per share: Net income available to common stockholders per share $ 1.78 $ 1.80 $ 1.98 Diluted earnings per share: Net income available to common stockholders per share $ 1.77 $ 1.80 $ 1.97 _____________________ (1) Participating securities include nonvested shares, 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 years ended December 31, 2024, 2023, and 2022. Certain market measure-based RSUs are not included in dilutive securities as of December 31, 2024, 2023, and 2022 as not all performance metrics had been met by the end of the applicable reporting periods. Additionally, certain unvested time-based RSUs are not included in dilutive securities for the year ended December 31, 2023 as they were anti-dilutive.

Net Income Available to Commo_2

Net Income Available to Common Unitholders Per Unit of the Operating Partnership	12 Months Ended
	Dec. 31, 2024
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 years ended December 31, 2024, 2023, and 2022: Year Ended December 31, 2024 2023 2022 (in thousands, except unit and per unit amounts) Numerator: Net income available to common stockholders $ 210,969 $ 212,241 $ 232,615 Allocation to participating securities (1) (1,967) (1,233) (1,272) Numerator for basic and diluted net income available to common stockholders $ 209,002 $ 211,008 $ 231,343 Denominator: Basic weighted average vested shares outstanding 117,649,111 117,160,173 116,806,575 Effect of dilutive securities 507,876 346,082 413,472 Diluted weighted average vested shares and common stock equivalents outstanding 118,156,987 117,506,255 117,220,047 Basic earnings per share: Net income available to common stockholders per share $ 1.78 $ 1.80 $ 1.98 Diluted earnings per share: Net income available to common stockholders per share $ 1.77 $ 1.80 $ 1.97 _____________________ (1) Participating securities include nonvested shares, 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 years ended December 31, 2024, 2023, and 2022. Certain market measure-based RSUs are not included in dilutive securities as of December 31, 2024, 2023, and 2022 as not all performance metrics had been met by the end of the applicable reporting periods. Additionally, certain unvested time-based RSUs are not included in dilutive securities for the year ended December 31, 2023 as they were anti-dilutive.
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 years ended December 31, 2024, 2023, and 2022: Year Ended December 31, 2024 2023 2022 (in thousands, except unit and per unit amounts) Numerator: Net income available to common unitholders $ 213,031 $ 214,324 $ 234,898 Allocation to participating securities (1) (1,967) (1,233) (1,272) Numerator for basic and diluted net income available to common unitholders $ 211,064 $ 213,091 $ 233,626 Denominator: Basic weighted average vested units outstanding 118,799,685 118,310,747 117,957,149 Effect of dilutive securities 507,876 346,082 413,472 Diluted weighted average vested units and common unit equivalents outstanding 119,307,561 118,656,829 118,370,621 Basic earnings per unit: Net income available to common unitholders per unit $ 1.78 $ 1.80 $ 1.98 Diluted earnings per unit: Net income available to common unitholders per unit $ 1.77 $ 1.80 $ 1.97 ____________________ (1) Participating securities include nonvested shares, 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 RSUs are considered in our diluted earnings per share calculation for the years ended December 31, 2024, 2023, and 2022. Certain market measure-based RSUs are not included in dilutive securities as of December 31, 2024, 2023, and 2022 as not all performance metrics had been met by the end of the applicable reporting periods. Additionally, certain unvested time-based RSUs are not included in dilutive securities for the year ended December 31, 2023 as they were anti-dilutive.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information of the Company	12 Months Ended
	Dec. 31, 2024
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information of the Company	Supplemental Cash Flows Information of the Company Supplemental cash flows information as follows (in thousands): Year Ended December 31, 2024 2023 2022 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $77,871, $74,052, and $72,973 as of December 31, 2024, 2023 , and 2022, respectively $ 126,668 $ 105,767 $ 79,634 Cash paid for amounts included in the measurement of ground lease liabilities $ 6,484 $ 6,733 $ 6,447 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 54,190 $ 95,575 $ 97,729 Tenant improvements funded directly by tenants $ 2,745 $ 7,364 $ 6,772 Remeasurement of ground lease liability and related right of use ground lease asset $ 4,782 $ — $ — NON-CASH FINANCING TRANSACTIONS: Accrual of dividends and distributions payable to common stockholders and common unitholders (Notes 14) $ 64,850 $ 64,440 $ 64,285 The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 510,163 $ 347,379 $ 414,077 Restricted cash at beginning of period — — 13,006 Cash and cash equivalents and restricted cash at beginning of period $ 510,163 $ 347,379 $ 427,083 Cash and cash equivalents at end of period $ 165,690 $ 510,163 $ 347,379 Restricted cash at end of period — — — Cash and cash equivalents and restricted cash at end of period $ 165,690 $ 510,163 $ 347,379

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information of the Operating Partnership	12 Months Ended
	Dec. 31, 2024
Other Significant Noncash Transactions [Line Items]
Supplemental Cash Flow Information of the Operating Partnership	Supplemental Cash Flows Information of the Company Supplemental cash flows information as follows (in thousands): Year Ended December 31, 2024 2023 2022 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $77,871, $74,052, and $72,973 as of December 31, 2024, 2023 , and 2022, respectively $ 126,668 $ 105,767 $ 79,634 Cash paid for amounts included in the measurement of ground lease liabilities $ 6,484 $ 6,733 $ 6,447 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 54,190 $ 95,575 $ 97,729 Tenant improvements funded directly by tenants $ 2,745 $ 7,364 $ 6,772 Remeasurement of ground lease liability and related right of use ground lease asset $ 4,782 $ — $ — NON-CASH FINANCING TRANSACTIONS: Accrual of dividends and distributions payable to common stockholders and common unitholders (Notes 14) $ 64,850 $ 64,440 $ 64,285 The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 510,163 $ 347,379 $ 414,077 Restricted cash at beginning of period — — 13,006 Cash and cash equivalents and restricted cash at beginning of period $ 510,163 $ 347,379 $ 427,083 Cash and cash equivalents at end of period $ 165,690 $ 510,163 $ 347,379 Restricted cash at end of period — — — Cash and cash equivalents and restricted cash at end of period $ 165,690 $ 510,163 $ 347,379
Kilroy Realty L.P.
Other Significant Noncash Transactions [Line Items]
Supplemental Cash Flow Information of the Operating Partnership	Supplemental Cash Flows Information of the Operating Partnership: Supplemental cash flows information as follows (in thousands): Year Ended December 31, 2024 2023 2022 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $77,871, $74,052, and $72,973 as of December 31, 2024, 2023, and 2022, respectively $ 126,668 $ 105,767 $ 79,634 Cash paid for amounts included in the measurement of ground lease liabilities $ 6,484 $ 6,733 $ 6,447 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 54,190 $ 95,575 $ 97,729 Tenant improvements funded directly by tenants $ 2,745 $ 7,364 $ 6,772 Remeasurement of ground lease liability and related right of use ground lease asset $ 4,782 $ — $ — NON-CASH FINANCING TRANSACTIONS: Accrual of distributions payable to common unitholders (Note 15) $ 64,850 $ 64,440 $ 64,285 The following is a reconciliation of our cash and cash equivalents and restricted cash at the beginning and end of the years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 510,163 $ 347,379 $ 414,077 Restricted cash at beginning of period — — 13,006 Cash and cash equivalents and restricted cash at beginning of period $ 510,163 $ 347,379 $ 427,083 Cash and cash equivalents at end of period $ 165,690 $ 510,163 $ 347,379 Restricted cash at end of period — — — Cash and cash equivalents and restricted cash at end of period $ 165,690 $ 510,163 $ 347,379

Tax Treatment of Distributions

Tax Treatment of Distributions	12 Months Ended
	Dec. 31, 2024
Tax Treatment of Distributions [Abstract]
Tax Treatment of Distributions	Tax Treatment of Distributions The following table reconciles the dividends declared per share of common stock to the dividends paid per share of common stock during the years ended December 31, 2024, 2023, and 2022 as follows: Year Ended December 31, Dividends 2024 2023 2022 Dividends declared per share of common stock $ 2.160 $ 2.160 $ 2.120 Less: Dividends declared in the current year and paid in the following year (0.540) (0.540) (0.540) Add: Dividends declared in the prior year and paid in the current year 0.540 0.540 0.520 Dividends paid per share of common stock $ 2.160 $ 2.160 $ 2.100 The unaudited income tax treatment for the dividends to common stockholders reportable for the years ended December 31, 2024, 2023, and 2022 as identified in the table above was as follows: Year Ended December 31, Shares of Common Stock 2024 2023 2022 Ordinary income (1) $ 1.916 88.70 % $ 2.087 96.63 % $ 1.865 88.80 % Qualified dividend 0.001 0.05 % 0.001 0.04 % 0.001 0.02 % Return of capital 0.238 11.02 % 0.069 3.21 % 0.230 10.99 % Capital gains (2) 0.005 0.23 % 0.003 0.12 % 0.004 0.19 % Unrecaptured section 1250 gains — — % — — % — — % $ 2.160 100.00 % $ 2.160 100.00 % $ 2.100 100.00 % ____________________ (1) The Tax Cuts and Jobs Act enacted on December 22, 2017 generally allows a deduction for noncorporate taxpayers equal to 20% of ordinary dividends distributed by a REIT (excluding capital gain dividends and qualified dividend income). The amount of dividend eligible for this deduction is referred to as the Section 199A Dividend. For the year ended December 31, 2024, the Section 199A Dividend is equal to the total ordinary income dividend. (2) Capital gains are comprised entirely of 20% rate gains.

Segments

Segments	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Segments	Segments Operating segments are defined as components of an enterprise that engage in business activities from which they may earn revenues and incur expenses and about which discrete financial information is available that is evaluated regularly by the Chief Operating Decision Maker (“CODM”). The CODM decides how resources are allocated and assesses performance on a recurring basis, at least quarterly. Our CODM is our CEO, who evaluates the operating performance and financial results of our consolidated portfolio based on net income through the monthly operations meetings. We conduct our business in one operating segment, and therefore have one reportable segment. Asset information by segment is not reported because the Company does not use this measure to assess performance. Our reportable segment derives its revenues primarily from rental revenue and other related income through the leasing of office space to tenants. We recognize revenue from base rent (fixed lease payments), additional rent (variable lease payments, which consist of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs), parking, and other lease-related revenue. The following table presents Net Income for the years ended December 31, 2024, 2023, and 2022: Year Ended December 31, 2024 2023 2022 REVENUES: Rental income $ 1,118,115 $ 1,117,737 $ 1,086,018 Other property income 17,514 11,957 10,969 Total revenues 1,135,629 1,129,694 1,096,987 EXPENSES: Property expenses 243,441 228,964 202,744 Real estate taxes 108,951 105,868 105,869 Ground leases 11,715 9,732 7,565 General and administrative expenses 72,066 93,434 93,642 Leasing costs 8,764 6,506 4,879 Depreciation and amortization 356,182 355,278 357,611 Total expenses 801,119 799,782 772,310 OTHER INCOME (EXPENSES) : Interest and other income, net 37,752 22,592 1,765 Interest expense (145,287) (114,216) (84,278) Gains on sales of depreciable operating properties — — 17,329 Gain on sales of long-lived assets 5,979 — — Total other (expenses) income (101,556) (91,624) (65,184) NET INCOME $ 232,954 $ 238,288 $ 259,493

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS Years ended December 31, 2024, 2023, and 2022 (in thousands) Balance at Charged to Costs and Expenses (1) Deductions (2) Balance Allowance for Uncollectible Tenant Receivables for the year ended 2024 – Allowance for uncollectible tenant receivables $ 1,567 $ 374 $ (1,627) $ 314 2023 – Allowance for uncollectible tenant receivables 2,233 1,524 (2,190) 1,567 2022 – Allowance for uncollectible tenant receivables 2,062 1,447 (1,276) 2,233 Allowance for Deferred Rent Receivables for the year ended 2024 – Allowance for deferred rent $ 728 $ — $ (728) $ — 2023 – Allowance for deferred rent 965 667 (904) 728 2022 – Allowance for deferred rent 612 864 (511) 965 ____________________ (1) Amounts do not reflect leases deemed not probable of collection for which we reversed the associated revenue under Topic 842. Also does not reflect the adjustment to restore leases previously deemed not probable of collection to an accrual basis. (2) For the year ended December 31, 2024, includes reversals of allowance for doubtful accounts for tenants with an allowance at January 1, 2024, that were subsequently deemed not probable of collection and transitioned to a cash basis of reporting within the same year.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2024
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate and Accumulated Depreciation	SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION December 31, 2024 Initial Cost Gross Amounts at Which Property Location Encumb- Land and Improve- Buildings Costs Land and Improve- Buildings Total Accumulated Depreci- ation Life (1) Date of Acquisition (A)/ Construction (C) (2) Rentable Square Feet (3) (unaudited) ($ in thousands) Office Properties: 3101 - 3243 S. La Cienega Blvd., Culver City, CA $ 150,718 $ 31,033 $ 3,946 $ 150,718 $ 34,979 $ 185,697 $ 24,483 35 2019 A 166,207 2240 E. Imperial Highway, El Segundo, CA 1,044 11,763 30,549 1,048 42,308 43,356 32,678 35 1983 C 122,870 2250 E. Imperial Highway, El Segundo, CA 2,579 29,062 37,806 2,547 66,900 69,447 62,771 35 1983 C 298,728 2260 E. Imperial Highway, El Segundo, CA 2,518 28,370 37,660 2,547 66,001 68,548 27,479 35 2012 C 298,728 909 N. Pacific Coast Highway, El Segundo, CA 3,577 34,042 56,884 3,565 90,938 94,503 58,445 35 2005 C 244,880 999 N. Pacific Coast Highway, El Segundo, CA 1,407 34,326 18,843 1,407 53,169 54,576 35,932 35 2003 C 138,389 1350 Ivar Ave., Los Angeles, CA 1,575 — 14,279 1,575 14,279 15,854 1,686 35 2020 C 16,448 1355 Vine St., Los Angeles, CA 17,588 — 120,284 17,588 120,284 137,872 14,689 35 2020 C 183,129 1375 Vine St., Los Angeles, CA 15,578 — 103,352 15,578 103,352 118,930 12,566 35 2020 C 159,236 1395 Vine St., Los Angeles, CA 278 — 3,261 278 3,261 3,539 388 35 2020 C 2,575 1500 N. El Centro Ave., Los Angeles, CA (4) 9,235 21 64,018 9,235 64,039 73,274 19,739 35 2016 C 113,447 1525 N. Gower St., Los Angeles, CA (4) 1,318 3 9,771 1,318 9,774 11,092 2,920 35 2016 C 9,610 1575 N. Gower St., Los Angeles, CA (4) 22,153 51 120,168 22,153 120,219 142,372 30,223 35 2016 C 264,430 6115 W. Sunset Blvd., Los Angeles, CA (4) 1,313 3 17,435 2,455 16,296 18,751 5,988 35 2015 C 26,238 6121 W. Sunset Blvd., Los Angeles, CA (4) 11,120 4,256 44,205 8,703 50,878 59,581 14,768 35 2015 C 93,418 6255 W. Sunset Blvd., Los Angeles, CA 18,111 60,320 56,481 18,111 116,801 134,912 63,863 35 2012 A 325,772 3750 Kilroy Airport Way, Long Beach, CA — 1,941 13,679 — 15,620 15,620 13,303 35 1989 C 10,718 3760 Kilroy Airport Way, Long Beach, CA — 17,467 24,129 — 41,596 41,596 33,855 35 1989 C 166,761 3780 Kilroy Airport Way, Long Beach, CA — 22,319 41,111 — 63,430 63,430 50,720 35 1989 C 221,452 3800 Kilroy Airport Way, Long Beach, CA — 19,408 25,730 — 45,138 45,138 33,291 35 2000 C 192,476 3840 Kilroy Airport Way, Long Beach, CA — 13,586 30,210 — 43,796 43,796 22,382 35 1999 C 138,441 3880 Kilroy Airport Way, Long Beach, CA — 9,704 12,848 — 22,552 22,552 7,944 35 2013 C 96,923 3900 Kilroy Airport Way, Long Beach, CA — 12,615 21,523 — 34,138 34,138 23,230 35 1997 A 130,935 8560 W. Sunset Blvd., West Hollywood, CA 9,720 50,956 8,067 9,720 59,023 68,743 17,404 35 2016 A 76,359 8570 W. Sunset Blvd., West Hollywood, CA 31,693 27,974 7,277 31,693 35,251 66,944 10,491 35 2016 A 49,276 8580 W. Sunset Blvd., West Hollywood, CA 10,013 3,695 1,847 10,013 5,542 15,555 1,807 35 2016 A 6,875 8590 W. Sunset Blvd., West Hollywood, CA 39,954 27,884 6,162 39,954 34,046 74,000 9,816 35 2016 A 56,750 12100 W. Olympic Blvd., Los Angeles, CA $152,668 (5) 352 45,611 27,407 9,633 63,737 73,370 39,243 35 2003 C 155,679 12200 W. Olympic Blvd., Los Angeles, CA (5) 4,329 35,488 29,817 3,977 65,657 69,634 50,837 35 2000 C 154,544 12233 W. Olympic Blvd., Los Angeles, CA 22,100 53,170 7,029 22,100 60,199 82,299 24,095 35 2012 A 156,746 12312 W. Olympic Blvd., Los Angeles, CA (5) 3,325 12,202 12,671 3,399 24,799 28,198 21,030 35 1997 A 78,900 2100/2110 Colorado Ave., Santa Monica, CA 5,474 26,087 20,980 5,476 47,065 52,541 33,534 35 1997 A 104,853 501 Santa Monica Blvd., Santa Monica, CA 4,547 12,044 19,568 4,551 31,608 36,159 25,203 35 1998 A 78,509 12225 El Camino Real, Del Mar, CA 1,700 9,633 4,870 1,673 14,530 16,203 11,378 35 1998 A 58,401 KILROY REALTY CORPORATION AND KILROY REALTY, L.P. SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION – (Continued) December 31, 2024 Initial Cost Gross Amounts at Which Property Location Encumb- Land and Improve- Buildings Costs Land and Improve- Buildings Total Accumulated Depreci- ation Life (1) Date of Acquisition (A)/ Construction (C) (2) Rentable Square Feet (3) (unaudited) ($ in thousands) 12235 El Camino Real, Del Mar, CA 1,507 8,543 10,372 1,540 18,882 20,422 14,674 35 1998 A 53,751 12340 El Camino Real, Del Mar, CA 4,201 — 34,342 4,201 34,342 38,543 5,413 35 2022 C 109,307 12390 El Camino Real, Del Mar, CA 3,453 11,981 12,895 3,453 24,876 28,329 15,657 35 2000 C 73,238 12770 El Camino Real, Del Mar, CA 9,360 — 35,074 9,360 35,074 44,434 9,531 35 2016 C 75,035 12780 El Camino Real, Del Mar, CA 18,398 54,954 24,295 18,398 79,249 97,647 32,182 35 2013 A 140,591 12790 El Camino Real, Del Mar, CA 10,252 21,236 17,143 10,252 38,379 48,631 14,435 35 2013 A 87,944 12830 El Camino Real, Del Mar, CA $375,000 (6) 28,645 — 113,154 28,645 113,154 141,799 16,697 35 2021 C 196,444 12860 El Camino Real, Del Mar, CA (6) 11,326 — 51,970 11,326 51,970 63,296 7,822 35 2021 C 92,042 12348 High Bluff Dr., Del Mar, CA 1,629 3,096 9,084 1,629 12,180 13,809 9,465 35 1999 C 39,192 12400 High Bluff Dr., Del Mar, CA 15,167 — 49,940 15,167 49,940 65,107 13,021 35 2022 C 216,518 12707 High Bluff Dr., Del Mar, CA (7) 3,013 8,032 915 3,013 8,947 11,960 148 35 2024 A 59,245 12777 High Bluff Dr., Del Mar, CA (7) 3,013 6,134 687 3,013 6,821 9,834 115 35 2024 A 44,486 3579 Valley Centre Dr., Del Mar, CA 2,167 6,897 11,834 2,858 18,040 20,898 12,631 35 1999 C 54,960 3611 Valley Centre Dr., Del Mar, CA 4,184 19,352 29,673 5,259 47,950 53,209 35,382 35 2000 C 132,425 3661 Valley Centre Dr., Del Mar, CA 4,038 21,144 20,770 4,725 41,227 45,952 31,791 35 2001 C 131,662 3721 Valley Centre Dr., Del Mar, CA 4,297 18,967 18,378 4,254 37,388 41,642 24,813 35 2003 C 117,777 3811 Valley Centre Dr., Del Mar, CA 3,452 16,152 21,985 4,457 37,132 41,589 27,962 35 2000 C 118,912 3745 Paseo Place, Del Mar, CA (Retail) (6) 24,358 — 76,146 24,358 76,146 100,504 13,728 35 2019 C 95,871 13480 Evening Creek Dr. North, San Diego, CA 7,997 — 67,507 7,997 67,507 75,504 31,255 35 2008 C 143,401 13500 Evening Creek Dr. North, San Diego, CA 7,581 35,903 25,885 7,580 61,789 69,369 36,868 35 2004 A 137,660 13520 Evening Creek Dr. North, San Diego, CA 7,581 35,903 28,348 7,580 64,252 71,832 38,951 35 2004 A 146,701 2100 Kettner Blvd., San Diego, CA 19,861 — 108,772 19,861 108,772 128,633 7,089 35 2022 C 212,423 2305 Historic Decatur Rd., San Diego, CA 5,240 22,220 11,932 5,240 34,152 39,392 18,231 35 2010 A 107,456 4690 Executive Dr., San Diego, CA (8) — — 20,929 1,624 19,305 20,929 713 35 1999 A — 9455 Towne Centre Dr., San Diego, CA 6,081 — 79,595 6,081 79,595 85,676 9,798 35 2021 C 160,444 9514 Towne Centre Dr., San Diego, CA 4,928 — 47,756 4,928 47,756 52,684 2,069 35 2023 C 70,616 4100 Bohannon Dr., Menlo Park, CA 4,835 15,526 1,525 4,860 17,026 21,886 7,204 35 2012 A 47,643 4200 Bohannon Dr., Menlo Park, CA 4,798 15,406 8,364 4,662 23,906 28,568 10,605 35 2012 A 43,600 4300 Bohannon Dr., Menlo Park, CA 6,527 20,958 8,047 6,470 29,062 35,532 12,961 35 2012 A 63,430 4400 Bohannon Dr., Menlo Park, CA (9) — — 3,237 — 3,237 3,237 2,177 35 2012 A — 4500 Bohannon Dr., Menlo Park, CA 6,527 20,957 5,795 6,470 26,809 33,279 11,874 35 2012 A 63,429 4600 Bohannon Dr., Menlo Park, CA 4,798 15,406 5,286 4,939 20,551 25,490 9,832 35 2012 A 48,413 4700 Bohannon Dr., Menlo Park, CA 6,527 20,958 1,576 6,470 22,591 29,061 9,755 35 2012 A 63,429 KILROY REALTY CORPORATION AND KILROY REALTY, L.P. SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION – (Continued) December 31, 2024 Initial Cost Gross Amounts at Which Property Location Encumb- Land and Improve- Buildings Costs Land and Improve- Buildings Total Accumulated Depreci- ation Life (1) Date of Acquisition (A)/ Construction (C) (2) Rentable Square Feet (3) (unaudited) ($ in thousands) 1290 - 1300 Terra Bella Ave., Mountain View, CA 28,730 27,555 13,130 28,730 40,685 69,415 11,591 35 2016 A 114,175 680 E. Middlefield Rd., Mountain View, CA 34,755 — 56,759 34,755 56,759 91,514 19,459 35 2014 C 171,676 690 E. Middlefield Rd., Mountain View, CA 34,605 — 56,515 34,605 56,515 91,120 19,376 35 2014 C 171,215 1701 Page Mill Rd., Palo Alto, CA — 99,522 111 — 99,633 99,633 24,020 35 2016 A 128,688 3150 Porter Dr., Palo Alto, CA — 21,715 6,446 — 28,161 28,161 7,582 35 2016 A 36,886 900 Jefferson Ave., Redwood City, CA (10) 16,668 — 109,620 18,063 108,225 126,288 35,124 35 2015 C 228,226 900 Middlefield Rd., Redwood City, CA (10) 7,959 — 64,606 8,626 63,939 72,565 16,538 35 2015 C 119,616 100 Hooper St., San Francisco, CA 78,564 — 197,034 85,510 190,088 275,598 35,842 35 2018 C 417,914 100 First St., San Francisco, CA (11) 49,150 131,238 84,007 49,150 215,245 264,395 115,810 35 2010 A 480,457 303 Second St., San Francisco, CA (12) 63,550 154,153 120,741 63,550 274,894 338,444 146,435 35 2010 A 784,658 201 Third St., San Francisco, CA 19,260 84,018 79,707 19,260 163,725 182,985 103,058 35 2011 A 346,538 360 Third St., San Francisco, CA — 88,235 128,515 28,504 188,246 216,750 81,239 35 2011 A 436,357 250 Brannan St., San Francisco, CA 7,630 22,770 10,797 7,630 33,567 41,197 16,440 35 2011 A 100,850 301 Brannan St., San Francisco, CA 5,910 22,450 17,204 5,910 39,654 45,564 17,652 35 2011 A 82,834 333 Brannan St., San Francisco, CA 18,645 — 80,685 18,645 80,685 99,330 21,215 35 2016 C 185,602 345 Brannan St., San Francisco, CA 29,405 113,179 1,358 29,403 114,539 143,942 20,282 35 2018 A 110,050 350 Mission St., San Francisco, CA 52,815 — 212,742 52,815 212,742 265,557 57,855 35 2016 C 455,340 345 Oyster Point Blvd., South San Francisco, CA 13,745 18,575 1 13,745 18,576 32,321 3,948 35 2018 A 40,410 347 Oyster Point Blvd., South San Francisco, CA 14,071 18,289 44 14,071 18,333 32,404 3,905 35 2018 A 39,780 349 Oyster Point Blvd., South San Francisco, CA 23,112 22,601 352 23,112 22,953 46,065 6,145 35 2018 A 65,340 350 Oyster Point Blvd., South San Francisco, CA 23,719 — 177,042 23,719 177,042 200,761 17,251 35 2021 C 234,892 352 Oyster Point Blvd., South San Francisco, CA 23,449 — 165,497 23,449 165,497 188,946 17,361 35 2021 C 232,215 354 Oyster Point Blvd., South San Francisco, CA 19,538 — 141,041 19,538 141,041 160,579 17,349 35 2021 C 193,472 505 Mathilda Ave., Sunnyvale, CA 37,843 1,163 50,450 37,943 51,513 89,456 15,019 35 2014 C 212,322 555 Mathilda Ave., Sunnyvale, CA 37,843 1,163 50,447 37,943 51,510 89,453 15,018 35 2014 C 212,322 599 Mathilda Ave., Sunnyvale, CA 13,538 12,559 609 13,538 13,168 26,706 6,212 35 2012 A 76,031 605 Mathilda Ave., Sunnyvale, CA 29,014 891 77,281 29,090 78,096 107,186 33,548 35 2014 C 162,785 601 108th Ave., Bellevue, WA — 214,095 90,414 42,680 261,829 304,509 127,395 35 2011 A 490,738 10900 NE 4th St., Bellevue, WA 25,080 150,877 55,231 25,080 206,108 231,188 98,543 35 2012 A 428,557 2001 W. 8th Ave., Seattle, WA 84,076 371,154 27,388 84,076 398,542 482,618 41,445 35 2021 A 535,395 333 Dexter Ave. North, Seattle, WA 42,854 — 328,064 42,854 328,064 370,918 37,737 35 2022 C 618,766 701 N. 34th St., Seattle, WA — 48,027 12,145 — 60,172 60,172 27,052 35 2012 A 141,860 801 N. 34th St., Seattle, WA — 58,537 23,824 — 82,361 82,361 33,635 35 2012 A 173,615 837 N. 34th St., Seattle, WA — 37,404 7,354 — 44,758 44,758 19,792 35 2012 A 112,487 320 Westlake Ave. North, Seattle, WA 79,020 (13) 14,710 82,018 15,219 14,710 97,237 111,947 37,480 35 2013 A 184,644 KILROY REALTY CORPORATION AND KILROY REALTY, L.P. SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION – (Continued) December 31, 2024 Initial Cost Gross Amounts at Which Property Location Encumb- Land and Improve- Buildings Costs Land and Improve- Buildings Total Accumulated Depreci- ation Life (1) Date of Acquisition (A)/ Construction (C) (2) Rentable Square Feet (3) (unaudited) ($ in thousands) 321 Terry Ave. North, Seattle, WA (13) 10,430 60,003 11,066 10,430 71,069 81,499 28,230 35 2013 A 135,755 401 Terry Ave. North, Seattle, WA 22,500 77,046 32 22,500 77,078 99,578 26,718 35 2014 A 174,530 200 W. 6th St., Austin, TX — — 654,578 — 654,578 654,578 38,398 35 2023 C 758,975 Residential Properties: 1550 N. El Centro Ave., Los Angeles, CA (4) 16,970 39 138,148 16,970 138,187 155,157 34,097 35 2016 C — 6390 De Longpre Ave., Hollywood, CA 12,112 — 162,481 12,112 162,481 174,593 17,436 35 2021 C — 3200 Paseo Village Way, Del Mar, CA (6) 106,419 — 272,044 106,419 272,044 378,463 38,354 35 2020 C — TOTAL OPERATING PROPERTIES 606,688 1,657,729 2,974,035 5,717,807 1,750,820 8,598,751 10,349,571 2,824,616 17,142,721 Undeveloped land and construction in progress — 911,886 — 1,397,738 911,886 1,397,738 2,309,624 — — TOTAL ALL PROPERTIES $ 606,688 (14) $ 2,569,615 $ 2,974,035 $ 7,115,545 $ 2,662,706 $ 9,996,489 $ 12,659,195 $ 2,824,616 17,142,721 ____________________ (1) The initial costs of buildings and improvements are depreciated over 35 years using a straight-line method of accounting; improvements capitalized subsequent to acquisition or development are depreciated over the shorter of the lease term or useful life, generally ranging from one (2) Represents our date of construction or acquisition, or of our predecessor, the Kilroy Group. (3) Represents the square footage of our stabilized portfolio. (4) These properties include the allocated costs of a shared parking structure for a complex comprised of five office buildings and one residential tower. (5) These properties secure a $152.7 million mortgage note. (6) These properties secure a $375.0 million mortgage note. (7) These properties were acquired in the third quarter of 2024. (8) This property was taken out of the stabilized portfolio in the first quarter of 2022 for redevelopment in phases. (9) This property was taken out of the stabilized portfolio in the fourth quarter of 2022 for redevelopment. (10) These properties are owned by Redwood City Partners LLC, a consolidated property partnership. (11) This property is owned by 100 First Street Member LLC, a consolidated property partnership. (12) This property is owned by 303 Second Street Member LLC, a consolidated property partnership. (13) These properties secure a $79.0 million mortgage note. (14) Represents gross aggregate principal amount before the effect of the deferred financing costs of $8.5 million as of December 31, 2024. As of December 31, 2024, the aggregate gross cost of property included above for federal income tax purposes approximated $10.4 billion. The following table reconciles the historical cost of total real estate held for investment from January 1, 2022 to December 31, 2024: Year Ended December 31, 2024 2023 2022 (in thousands) Total real estate held for investment, beginning of year $ 12,241,648 $ 11,732,183 $ 11,292,693 Additions during period: Acquisitions 21,941 — 40,033 Improvements, etc. 400,880 511,866 439,759 Total additions during period 422,821 511,866 479,792 Deductions during period: Cost of real estate sold — — (32,855) Other (5,274) (2,401) (7,447) Total deductions during period (5,274) (2,401) (40,302) Total real estate held for investment, end of year $ 12,659,195 $ 12,241,648 $ 11,732,183 The following table reconciles the accumulated depreciation from January 1, 2022 to December 31, 2024: Year Ended December 31, 2024 2023 2022 (in thousands) Accumulated depreciation, beginning of year $ 2,518,304 $ 2,218,710 $ 2,003,656 Additions during period: Depreciation of real estate 307,967 300,119 287,799 Total additions during period 307,967 300,119 287,799 Deductions during period: Write-offs due to sale — — (19,114) Other (1,655) (525) (53,631) Total deductions during period (1,655) (525) (72,745) Accumulated depreciation, end of year $ 2,824,616 $ 2,518,304 $ 2,218,710

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Cybersecurity Risk Management and Strategy We have developed and implemented a cybersecurity risk management program intended to protect the confidentiality, integrity, and availability of our critical systems and information. Our cybersecurity risk management program is integrated with our overall enterprise risk management program and shares common methodologies, reporting channels, and governance processes that apply across the enterprise risk management program to other legal, compliance, strategic, operational, and financial risk areas. Our overall cybersecurity program includes, amongst other things: • security tools, technologies and processes, control reviews, policy reviews, penetration tests, and investments in our security infrastructure; • cybersecurity awareness training exercises for our employees, including phishing simulations to raise awareness of spoofed or manipulated electronic communications, and other critical security threats; • annual review of System and Organization (“SOC”) reports for our core third-party providers based on our assessment of their respective criticality and risk profile; and • a Cybersecurity Incident Response Plan that provides a framework and guidelines for responding to cybersecurity incidents that may compromise the confidentiality, integrity, and availability of our critical systems and information. Our Board has delegated to the Audit Committee oversight of cybersecurity and other information technology risks. The Audit Committee receives periodic reports from management on our cybersecurity risks. We have not identified known risks, including as a result of prior cybersecurity incidents, that have materially affected us, including our operations, business strategy, results of operations, or financial condition. We face certain ongoing risks from cybersecurity threats that, if realized, are reasonably likely to materially affect us, including our operations, business strategy, results of operations, or financial condition. See “Risk Factors – We face risks associated with perceived or actual security breaches through cyberattacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems or those of our critical service providers.”
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	We have developed and implemented a cybersecurity risk management program intended to protect the confidentiality, integrity, and availability of our critical systems and information. Our cybersecurity risk management program is integrated with our overall enterprise risk management program and shares common methodologies, reporting channels, and governance processes that apply across the enterprise risk management program to other legal, compliance, strategic, operational, and financial risk areas.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Our Board considers cybersecurity risk as critical to the enterprise and delegates the cybersecurity risk oversight function to the Audit Committee. The Audit Committee oversees management’s design, implementation, and enforcement of our cybersecurity risk management program. The Audit Committee reports to the full Board regarding its activities, including those related to cybersecurity risk oversight. The full Board also receives briefings from management on our cyber risk management program. Board members receive presentations on cybersecurity topics from our Executive Vice President, Chief Administrative Officer, Executive Vice President, General Counsel and Secretary, and Vice President, Enterprise Applications as part of the Board’s continuing education. Our cybersecurity risk management team - including our Executive Vice President, Chief Financial Officer and Treasurer, Executive Vice President, Chief Administrative Officer, Executive Vice President, General Counsel and Secretary, Senior Vice President, Chief Accounting Officer and Controller, Senior Vice President, Information Technology, and the Vice President, Enterprise Applications - is responsible for assessing and managing our material risks from cybersecurity threats. The team has primary responsibility for our overall cybersecurity risk management program and supervises our internal cybersecurity personnel, our retained external cybersecurity consultants, and the simulated tabletop exercises of our Cybersecurity Incident Response Plan, conducted at least annually to ensure our team is prepared to respond to any future cybersecurity incidents. The team is informed about and monitors the prevention, detection, mitigation, and remediation of cybersecurity incidents through briefings with internal and external personnel, publicly available information about cybersecurity risks and threats, and through alerts from security tools deployed in our IT environment. Our Vice President, Enterprise Application’s experience includes a Certified Information Systems Security Professional (“CISSP”) certification, which is designed for security professionals with extensive knowledge in contemporary cybersecurity and information security practices. In addition, our Chief Executive Officer has broad expertise in overseeing cybersecurity programs, incident response teams, and information technology departments.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our Board considers cybersecurity risk as critical to the enterprise and delegates the cybersecurity risk oversight function to the Audit Committee. The Audit Committee oversees management’s design, implementation, and enforcement of our cybersecurity risk management program.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The full Board also receives briefings from management on our cyber risk management program. Board members receive presentations on cybersecurity topics from our Executive Vice President, Chief Administrative Officer, Executive Vice President, General Counsel and Secretary, and Vice President, Enterprise Applications as part of the Board’s continuing education.
Cybersecurity Risk Role of Management [Text Block]	Our cybersecurity risk management team - including our Executive Vice President, Chief Financial Officer and Treasurer, Executive Vice President, Chief Administrative Officer, Executive Vice President, General Counsel and Secretary, Senior Vice President, Chief Accounting Officer and Controller, Senior Vice President, Information Technology, and the Vice President, Enterprise Applications - is responsible for assessing and managing our material risks from cybersecurity threats. The team has primary responsibility for our overall cybersecurity risk management program and supervises our internal cybersecurity personnel, our retained external cybersecurity consultants, and the simulated tabletop exercises of our Cybersecurity Incident Response Plan, conducted at least annually to ensure our team is prepared to respond to any future cybersecurity incidents. The team is informed about and monitors the prevention, detection, mitigation, and remediation of cybersecurity incidents through briefings with internal and external personnel, publicly available information about cybersecurity risks and threats, and through alerts from security tools deployed in our IT environment. Our Vice President, Enterprise Application’s experience includes a Certified Information Systems Security Professional (“CISSP”) certification, which is designed for security professionals with extensive knowledge in contemporary cybersecurity and information security practices. In addition, our Chief Executive Officer has broad expertise in overseeing cybersecurity programs, incident response teams, and information technology departments.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Our Board has delegated to the Audit Committee oversight of cybersecurity and other information technology risks. The Audit Committee receives periodic reports from management on our cybersecurity risks.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our Vice President, Enterprise Application’s experience includes a Certified Information Systems Security Professional (“CISSP”) certification, which is designed for security professionals with extensive knowledge in contemporary cybersecurity and information security practices. In addition, our Chief Executive Officer has broad expertise in overseeing cybersecurity programs, incident response teams, and information technology departments.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The Audit Committee reports to the full Board regarding its activities, including those related to cybersecurity risk oversight. The full Board also receives briefings from management on our cyber risk management program. Board members receive presentations on cybersecurity topics from our Executive Vice President, Chief Administrative Officer, Executive Vice President, General Counsel and Secretary, and Vice President, Enterprise Applications as part of the Board’s continuing education.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Basis of Presentation and Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
Partially Owned Entities and Variable Interest Entities	Our accounting policy is to consolidate entities in which we have a controlling financial interest and significant decision making control over the entity’s operations. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, size of our investment (including loans), authority to control decisions, and contractual and substantive participating rights of the members. In addition to evaluating control rights, we consolidate entities in which the other members have no substantive kick-out rights to remove the Company as the managing member. Entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or the holders of the equity investment at risk do not have a controlling financial interest are VIEs. We evaluate whether an entity is a VIE and whether we are the primary beneficiary. We are deemed to be the primary beneficiary of a VIE when we have the power to direct the activities of the VIE that most significantly impact the VIEs’ economic performance and the obligation to absorb losses or receive benefits that could potentially be significant to the VIE.
Revenue Recognition, Base Rent, Additional Rent - Reimbursements from Tenants, Other Property Income, Uncollectible Lease Receivables and Allowance for Tenant and Deferred Rent Receivables	Revenue Recognition Rental revenue for office, life science, retail, and residential operating properties is our principal source of revenue. We recognize revenue from base rent (fixed lease payments), additional rent (variable lease payments, which consist of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs), parking, and other lease-related revenue once all of the following criteria are met: (i) the agreement has been fully executed and delivered, (ii) services have been rendered, (iii) the amount is fixed or determinable, and (iv) payment has been received or the collectability of substantially all of the amount due is probable. Minimum annual rental revenues are recognized in rental revenues on a straight-line basis over the non-cancellable term of the related lease. Base Rent The timing of when we commence rental revenue recognition for office, life science, and retail properties depends largely on our conclusion as to whether we are or the tenant is the owner of tenant improvements at the leased property for accounting purposes. When we conclude that we are the owner of tenant improvements for accounting purposes, we record the cost to construct the tenant improvements as an asset and commence rental revenue recognition when the tenant takes possession of or controls the finished space, which is generally when tenant improvements being recorded as our assets are substantially complete. In certain instances, when we conclude that the tenant is the owner of certain tenant improvements for accounting purposes, rental revenue recognition begins when the tenant takes possession or controls the physical use of the leased space. The determination of who owns the tenant improvements is made on a lease-by-lease basis and has a significant effect on the timing of commencement of revenue recognition. Further, we may deliver leased space in phases, rather than for an entire building or project, resulting in various revenue commencement dates for a particular lease, which involves significant judgment surrounding when the tenant takes possession of or controls each respective phase, building or project. When we conclude that we are the owner of tenant improvements for accounting purposes, we record the cost to construct the tenant improvements, including costs paid for or reimbursed by the tenants, as our capital asset. For these tenant-funded tenant improvements, we record the amount funded by or reimbursed by tenants as deferred revenue, which is amortized and recognized as rental income on a straight-line basis over the term of the related lease beginning upon substantial completion of the leased premises. When we conclude that the tenant is the owner of certain tenant improvements for accounting purposes, we record our contribution towards those tenant-owned improvements as a lease incentive, which is included in deferred leasing costs and acquisition-related intangible assets, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the related lease beginning upon substantial completion of the leased premises. For residential properties, we commence revenue recognition upon lease commencement. Residential rental revenue is recognized on a straight-line basis over the term of the related lease, which is generally one year, net of any concessions. When a lease is amended, we determine whether (i) an additional right of use not included in the original lease is being granted as a result of the modification, and (ii) there is an increase in the lease payments that is commensurate with the standalone price for the additional right of use. If both of these conditions are met, the amendment is accounted for as a separate lease contract. If either of those conditions are not met, the amendment is accounted for as a lease modification. Most of our lease amendments are accounted for as modifications of our operating leases, which requires us to reassess both the lease term and fixed lease payments, including any prepaid or deferred rent receivables relating to the original lease, as a part of the lease payments for the modified lease. Termination options in some of our leases allow the tenant to terminate the lease, in part or in whole, prior to the end of the lease term under certain circumstances. Termination options generally require advance notification from the tenant and payment of a termination fee that reimburses us for a portion of the remaining rent under the original lease term and the net book value of lease inception costs such as commissions, tenant improvements and lease incentives. Termination fee income, included in rental income, is recognized on a straight-line basis from the date of the executed termination agreement through the revised lease expiration when the amount of the fee is determinable and collectability of the fee is probable. This fee income is reduced on a straight-line basis by any deferred rent receivable related to the lease. Generally, our leases require the tenant to restore the leased space to standard office condition upon the expiration of the lease. In some circumstances, tenants may negotiate to pay us a restoration fee in lieu of restoring the space. Restoration fee income, included in rental income, is recognized on a straight-line basis from the date of the executed restoration fee agreement through lease expiration when the amount of the fee is determinable and collectability of the fee is probable. When tenants declare bankruptcy, we may be able to collect some portion of their past-due rents through the bankruptcy process, whether through applying security deposit balances, drawing on tenants’ letters of credit, or through bankruptcy settlements. We recognize any amounts collected through the bankruptcy process when cash is received. Additional Rent - Reimbursements from Tenants Additional rent, consisting of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs, is recognized in rental income in the period the recoverable costs are incurred. Additional rent where we pay the associated costs directly to third-party vendors and are reimbursed by our tenants are recognized and recorded on a gross basis, with the associated expense recognized in property expenses or real estate taxes. Other Property Income Other property income primarily includes amounts recorded in connection with transient daily parking, broken deal income, and property damage settlement-related payments from third-party insurance carriers. Other property income also includes miscellaneous income from tenants and fees for late rental payments. Amounts recorded within other property income fall within the scope of ASC Topic 606 “Revenue from Contracts with Customers” and are recognized as revenue at the point in time when control of the goods or services transfers to the customer and our performance obligation is satisfied. Uncollectible Lease Receivables and Allowances for Tenant and Deferred Rent Receivables Current tenant receivables consist primarily of amounts due for contractual lease payments and reimbursements of common area maintenance expenses, property taxes, and other costs recoverable from tenants. Deferred rent receivables represent the amount by which the cumulative straight-line rental revenue recorded to date exceeds cash rents billed to date under the lease agreement. We carry our current and deferred rent receivables net of allowances for amounts that may not be collected. These allowances are increased or decreased through rental income, and our determination of the adequacy of the Company’s allowances for tenant receivables includes a binary assessment of whether or not substantially all of the amounts due under a tenant’s lease agreement are probable of collection. Such assessment involves using a methodology that incorporates a specific identification analysis and an aging analysis, considering the current economic and business environment, including factors such as the age and nature of the receivables, the payment history and financial condition of the tenant, our assessment of the tenant’s ability to meet its lease obligations, and the status of negotiations of any disputes with the tenant. This determination is performed on a quarterly basis and requires significant judgment and estimates about matters that are uncertain at the time the estimates are made, including the creditworthiness of specific tenants, specific industry trends and conditions, and general economic trends and conditions. Since these factors are beyond our control, actual results can differ from our estimates, and such differences could be material.
Acquisitions	Acquisitions Acquisitions of operating properties and development and redevelopment opportunities generally do not meet the definition of a business and are accounted for as asset acquisitions, as substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. For these asset acquisitions, we record the acquired tangible and intangible assets and assumed liabilities based on each asset’s and liability’s relative fair value at the acquisition date of the total purchase price plus any capitalized acquisition costs, including costs incurred during negotiation. When applicable, we record the acquired tangible and intangible assets and assumed liabilities of acquisitions of operating properties and development and redevelopment opportunities that meet the accounting criteria to be accounted for as business combinations at fair value at the acquisition date. We assess and consider fair value based on estimated cash flow projections that utilize available market information and discount and/or capitalization rates that we deem appropriate. Estimates of future cash flows are based on a number of factors, including historical operating results, known and anticipated trends, and market and economic conditions. The acquired assets and assumed liabilities for an acquisition generally include, but are not limited to: (i) land and improvements, buildings and improvements, undeveloped land and construction in progress, and (ii) identified tangible and intangible assets and liabilities associated with in-place leases, including tenant improvements, leasing costs, value of above-market and below-market operating leases and ground leases, acquired in-place lease values and tenant relationships, if any. Any debt assumed and equity (including common units of the Operating Partnership) issued in connection with a property acquisition is recorded at relative fair value on the date of acquisition. The fair value of land and improvements is derived from comparable sales of land and improvements within the same submarket and/or region. The fair value of buildings and improvements, tenant improvements and leasing costs considers the value of the property as if it was vacant as well as current replacement costs and other relevant market rate information. The fair value of the above-market or below-market component of an acquired in-place operating lease is based upon the present value (calculated using a market discount rate) of the difference between (i) the contractual rents to be paid pursuant to the lease over its remaining non-cancellable lease term, and (ii) management’s estimate of the rents that would be paid using fair market rental rates and rent escalations at the date of acquisition measured over the remaining non-cancellable term of the lease for above-market operating leases and the initial non-cancellable term plus the term of any below-market fixed rate renewal options, if applicable, for below-market operating leases. Our below-market operating leases generally do not include fixed rate or below-market renewal options. The amounts recorded for above-market operating leases are included in deferred leasing costs and acquisition-related intangible assets, net on the balance sheet and are amortized on a straight-line basis as a reduction of rental income over the remaining term of the applicable leases. The amounts recorded for below-market operating leases are included in deferred revenue and acquisition-related intangible liabilities, net on the balance sheet and are amortized on a straight-line basis as an increase to rental income over the remaining term of the applicable leases plus the term of any below-market fixed rate renewal options, if applicable. The amortization of a below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented. The amortization of an above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented. If a lease were to be terminated prior to its contractual expiration, amortization of the related above-market or below-market lease intangible would be accelerated through the termination date. The fair value of acquired in-place leases is derived based on management’s assessment of lost revenue and costs incurred for the period required to lease the “assumed vacant” property to the occupancy level when purchased. This fair value is based on a variety of considerations, including, but not necessarily limited to: (i) the value associated with lost rental revenue from existing leases during the assumed lease-up period (ii) the value associated with avoiding the cost of originating the acquired in-place leases; and (iii) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period. Factors we consider in performing these analyses include an estimate of the carrying costs during the expected lease-up periods, current market conditions, and costs to execute similar leases. In estimating carrying costs, we include real estate taxes, insurance, and other operating expenses, and estimates of lost rental revenue during the expected lease-up periods based on current market demand at market rates. In estimating costs to execute similar leases, we consider leasing commissions, legal, and other related expenses. The amount recorded for acquired in-place leases is included in deferred leasing costs and acquisition-related intangible assets, net on the balance sheet and amortized as an increase to depreciation and amortization expense over the remaining term of the applicable leases. Fully amortized intangible assets are written off each quarter. If a lease were to be terminated or if termination were determined to be likely prior to its contractual expiration (for example resulting from bankruptcy), amortization of the related unamortized in-place lease intangible would be accelerated. The determination of the fair value of any debt assumed in connection with a property acquisition is estimated by discounting the future cash flows using market interest rates available for the issuance of debt with similar terms and remaining maturities. The determination of the fair value of the acquired tangible and intangible assets and assumed liabilities of acquisitions requires us to make significant judgments and assumptions about the numerous inputs discussed above. The use of different assumptions in these fair value calculations could significantly affect the reported amounts of the allocation of our acquisition related assets and liabilities and the related depreciation and amortization expense recorded for such assets and liabilities. In addition, because the value of above and below market leases are amortized as either a reduction or increase to rental income, respectively, our judgments for these intangibles could have a significant impact on our reported rental revenues and results of operations.
Operating Properties, Cost Capitalization, Depreciation and Amortization of Buildings and Improvements	Operating Properties Operating properties are generally carried at historical cost less accumulated depreciation. Properties held for sale are reported at the lower of the carrying value or the fair value less estimated cost to sell. The cost of operating properties includes the purchase price or development costs of the properties. Costs incurred for the renovation and extension of the useful life of the operating properties are capitalized to our investment in that property. Maintenance and repairs are charged to expense as incurred. Cost Capitalization We capitalize all costs clearly associated with development and redevelopment activities, capital improvements, and tenant improvements as project costs, including internal compensation costs related to those activities. In addition, the following costs are capitalized as project costs during periods in which activities necessary to prepare development and redevelopment properties for their intended use are in progress: pre-construction costs essential to the development of the property, interest costs based on the weighted average interest rate of our outstanding indebtedness for the period, real estate taxes, and insurance. Determining whether expenditures meet the criteria for capitalization requires management to exercise significant judgment. Expenditures that meet one or more of the following criteria generally qualify for capitalization: • Provide benefit in future periods; • Extend the useful life of the asset beyond our original estimates; and • Increase the quality of the asset beyond our original estimates. We define redevelopment properties as those properties for which we expect to spend significant development and construction costs pursuant to a formal plan to change its use, the intended result of which is a higher economic return on the property. We define a property in the tenant improvement phase as a development or redevelopment property where the project has reached “cold shell condition” and is ready for tenant improvements, which may require additional major base building modifications before being placed in service. Projects in the tenant improvement phase are moved into 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. For office, life science, and retail development and redevelopment properties, the date the capitalization period ends is based on property-specific leasing activity: • For properties that are pre-leased, we cease capitalization when revenue recognition has commenced on the leased space, which is upon substantial completion of tenant improvements deemed to be the Company’s asset for accounting purposes. • For properties that are not pre-leased, we may not immediately build out the tenant improvements. Therefore, we cease capitalization and begin depreciation on the portion of the property for which revenue recognition has commenced on the leased space, but in any event, no later than one year after the cessation of major base building construction activities. Revenue recognition commences on leased space upon substantial completion of the tenant improvements deemed to be the Company’s asset for accounting purposes. We also cease capitalization when activities necessary to prepare the property for its intended use have been suspended. For residential development properties, we cease capitalization when the property is substantially complete and available for occupancy. Once major base building construction activities have ceased and the development or redevelopment property (or phases thereof) have been placed in service, the costs capitalized to construction in progress are transferred to land and improvements, buildings and improvements, and deferred leasing costs on our consolidated balance sheets as the historical cost of the property. Evaluation of Asset Impairment When evaluating operating real estate assets to be held and used, as well as land held for future development for potential impairment, we first evaluate whether there are any indicators of impairment. If any impairment indicators are present for a specific real estate asset, we then perform an undiscounted cash flow analysis and compare the net carrying amount of the real estate asset to the real estate asset’s estimated undiscounted future cash flows over the anticipated holding period. If the estimated undiscounted future cash flows are less than the net carrying amount of the real estate asset, we perform an impairment loss calculation. Our impairment loss calculation compares the net carrying amount of the real estate asset to the real estate asset’s estimated fair value, which may be based on estimated discounted future cash flow calculations or third-party valuations or appraisals, and we recognize an impairment loss to the extent that the asset’s net carrying amount exceeds the asset’s estimated fair value. If we recognize an impairment loss, the estimated fair value of the real estate asset becomes its new cost basis. For a depreciable long-lived asset, the new cost basis would be depreciated (amortized) over the remaining useful life of that asset. Depreciation and Amortization of Buildings and Improvements
Real Estate Assets Held for Sale, Dispositions and Discontinued Operations	Real Estate Assets Held for Sale, Dispositions, and Discontinued Operations A real estate asset is classified as held for sale when certain criteria are met, including, but not limited to, the availability of the asset for immediate sale, the existence of an active program to locate a buyer, and the probable sale or transfer of the asset within one year. If such criteria are met, we present the applicable assets and liabilities related to the real estate asset, if material, separately on the balance sheet as held for sale and we would cease to record depreciation and amortization expense. Real estate assets held for sale are reported at the lower of their carrying value or their estimated fair value less the estimated costs to sell. As of December 31, 2024 and 2023, we did not have any properties classified as held for sale. Property disposals representing a strategic shift that have (or will have) a major effect on the Company’s operations and financial results, such as a major line of business, a major geographical area, or a major equity method investment, are required to be presented as discontinued operations. If we were to determine that a property disposition represents a strategic shift, the revenues, expenses, and net gain (loss) on dispositions of the property would be recorded in discontinued operations for all periods presented through the date of the applicable disposition. The operations of the property sold during the year ended December 31, 2022 is presented in continuing operations as it did not represent a strategic shift in the Company’s operations and financial results. We did not dispose of any properties during the years ended December 31, 2024 and 2023. The net gains (losses) on dispositions of non-depreciable real estate property, including land, are reported in the consolidated statements of operations as gains (losses) on sale of land within continuing operations in the period the land is sold. The net gains (losses) on dispositions of depreciable real estate property are reported in the consolidated statements of operations as gains (losses) on sales of depreciable operating properties within continuing operations in the period the property is sold.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly-liquid investments, including certificates of deposit, with original maturities of three months or less to be cash equivalents.
Restricted Cash	Restricted Cash
Marketable Securities	Marketable Securities Marketable securities reported in our consolidated balance sheets represent certificates of deposit with original maturities greater than three months and the assets held in connection with the Kilroy Realty Corporation 2007 Deferred Compensation Plan (the “Deferred Compensation Plan”) (see Note 17 “Employee Benefit Plans” for additional information. The Company intends to hold certificates of deposit until their maturity and, as a result, they are classified as held-to-maturity securities. As of December 31, 2024, the Company had no certificates of deposit with maturities greater than three months in marketable securities as all of the certificates of deposit held at December 31, 2023 matured during the year. The Deferred Compensation Plan assets are held in a limited rabbi trust and invested in various mutual and money market funds. As a result, the marketable securities are treated as trading securities for financial reporting purposes and are adjusted to fair value at the end of each accounting period.
Deferred Compensation Plan	At the time eligible management employees (“Participants”) defer compensation or earn mandatory Company contributions, or if we were to make a discretionary contribution, we record compensation cost and a corresponding deferred compensation plan liability, which is included in accounts payable, accrued expenses, and other liabilities on our consolidated balance sheets. This liability is adjusted to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each Participant, and the impact of adjusting the liability to fair value is recorded as an increase or decrease to compensation cost. The impact of adjusting the deferred compensation plan liability to fair value and the changes in the value of the marketable securities held in connection with the Deferred Compensation Plan generally offset and therefore do not significantly impact net income.
Deferred Leasing Costs	Deferred Leasing Costs Costs incurred in connection with successful property leasing are capitalized as deferred leasing costs and classified as investing activities in the statement of cash flows. Deferred leasing costs consist of leasing commissions paid to external third-party brokers and lease incentives, and are amortized using the straight-line method of accounting over the lives of the associated leases which generally range from one
Deferred Financing Costs and Debt Discounts and Premiums	Deferred Financing Costs Financing costs related to the origination or assumption of long-term debt are deferred and generally amortized into interest expense using the straight-line method of accounting, which approximates the effective interest method, over the contractual terms of the applicable financings. Fully amortized deferred financing costs are written off when the corresponding financing is repaid. Debt Discounts and Premiums
Noncontrolling Interests and Common Partnership Interests	Noncontrolling Interests - Common Units of the Operating Partnership in the Company’s Consolidated Financial Statements Common units of the Operating Partnership within noncontrolling interests in the Company’s consolidated financial statements represent the common limited partnership interests in the Operating Partnership not held by the Company (“noncontrolling common units”). Noncontrolling common units are presented in the equity section of the Company’s consolidated balance sheets and are reported at their proportionate share of the net assets of the Operating Partnership. Noncontrolling interests with redemption provisions that permit the issuer to settle in either cash or shares of common stock must be further evaluated to determine whether equity or temporary equity classification on the balance sheet is appropriate. Since the common units contain such a provision, we evaluated the accounting guidance and determined that the common units qualify for equity presentation in the Company’s consolidated financial statements. Net income attributable to noncontrolling common units is allocated based on their relative ownership percentage of the Operating Partnership during the reported period. The noncontrolling interest ownership percentage is determined by dividing the number of noncontrolling common units by the total number of common units outstanding. The issuance or redemption of additional shares of common stock or common units results in changes to the noncontrolling interest percentage as well as the total net assets of the Company. As a result, all equity transactions result in an allocation between equity and the noncontrolling interest in the Company’s consolidated balance sheets and statements of equity to account for the changes in the noncontrolling interest ownership percentage as well as the change in total net assets of the Company. Noncontrolling Interests in Consolidated Property Partnerships Noncontrolling interests in consolidated property partnerships represent the equity interests held by unrelated third parties in our three consolidated property partnerships (see Note 12 “Noncontrolling Interests on the Company’s Consolidated Financial Statements” and see Note 13 “Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements”). Noncontrolling interests in consolidated property partnerships are not redeemable and are presented as permanent equity in the Company’s consolidated balance sheets. We account for the noncontrolling interests in consolidated property partnerships using the hypothetical liquidation at book value (“HLBV”) method to attribute the earnings or losses of the consolidated property partnerships between the controlling and noncontrolling interests. Under the HLBV method, the amounts reported as noncontrolling interests in consolidated property partnerships in the consolidated balance sheets represent the amounts the noncontrolling interests would hypothetically receive at each balance sheet reporting date under the liquidation provisions of the governing agreements assuming the net assets of the consolidated property partnerships were liquidated at recorded amounts and distributed between the controlling and noncontrolling interests in accordance with the governing documents. The net income attributable to noncontrolling interests in consolidated property partnerships in the consolidated statements of operations is associated with the increase or decrease in the noncontrolling interest holders’ contractual claims on the respective entities’ balance sheets assuming a hypothetical liquidation at the end of that reporting period when compared with their claims on the respective entities’ balance sheets assuming a hypothetical liquidation at the beginning of that reporting period, after removing the impact of any contributions or distributions. Common Partnership Interests on the Operating Partnership’s Consolidated Balance Sheets The common units held by the Company and the noncontrolling common units held by the common limited partners are both presented in the permanent equity section of the Operating Partnership’s consolidated balance sheets in partners’ capital. The redemption rights of the noncontrolling common units permit us to settle the redemption obligation in either cash or shares of the Company’s common stock at our option (see Note 12 “Noncontrolling Interests on the Company’s Consolidated Financial Statements” for additional information). Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements
Equity Offerings	Equity Offerings Underwriting commissions and offering costs incurred in connection with common equity offerings and any at-the-market stock offering programs (see Note 14 “Stockholders’ Equity of the Company”) are reflected as a reduction of additional paid-in capital.
Share-based Incentive Compensation Accounting	Share-Based Incentive Compensation Accounting Compensation cost for all share-based awards, including options, requires measurement at estimated fair value on the grant date. Compensation cost is recognized on a straight-line basis over the service vesting period, which represents the requisite service period. The grant date fair value of market measure-based share-based compensation plans are calculated using a Monte Carlo simulation pricing model. Forfeitures of all share-based awards are recognized when they occur. For share-based awards in which the performance period precedes the grant date, we recognize compensation cost over the requisite service period, which includes both the performance and service vesting periods, using the accelerated attribution expense method. The requisite service period begins on the date the Executive Compensation Committee authorizes the award and adopts any relevant performance measures. For share-based awards with performance-based measures, the total estimated compensation cost is based on our most recent estimate of the probable achievement of the pre-established specific performance measures. These estimates are based on actual results and our latest internal forecasts for each performance measure. For share-based awards with market measures, the total estimated compensation cost is based on the fair value of the award at the grant date. For share-based awards with performance-based measures and market measures, the total estimated compensation cost is based on the fair value per share at the grant date multiplied by our most recent estimate of the number of shares to be earned based on actual results and the probable achievement of the pre-established corporate performance measures based on our latest internal forecasts. In accordance with the provisions of our share-based incentive compensation plan, we accept the return of shares of Company common stock, at the current quoted market price, from employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period.
Basic and Diluted Net Income Available to Common Stockholders (Unitholders) per Share (Unit)	Basic and Diluted Net Income Available to Common Stockholders per Share Basic net income available to common stockholders per share is computed by dividing net income available to common stockholders after the allocation of income to participating securities, by the weighted-average number of shares of common stock outstanding for the period. Diluted net income available to common stockholders per share is computed by dividing net income available for common stockholders, after the allocation of income to participating securities, by the sum of the weighted-average number of shares of common stock outstanding for the period plus the assumed exercise of all dilutive securities. The impact of the outstanding common units is considered in the calculation of diluted net income available to common stockholders per share. The common units are not reflected in the diluted net income available to common stockholders per share calculation because the exchange of common units into common stock is on a one for one basis, and the common units are allocated net income on a per share basis equal to the common stock (see Note 21 “Net Income Available to Common Stockholders Per Share of the Company”). Accordingly, any exchange would not have any effect on diluted net income (loss) available to common stockholders per share. Nonvested share-based payment awards (including nonvested restricted stock units (“RSUs”), vested market-measure RSUs and vested dividend equivalents issued to holders of RSUs) containing nonforfeitable rights to dividends or dividend equivalents are accounted for as participating securities and included in the computation of basic and diluted net income available to common stockholders per share pursuant to the two-class method. The dilutive effect of shares issuable under executed forward equity sale agreements, if any, and stock options are reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. The dilutive effect of the outstanding nonvested shares of common stock (“nonvested shares”) and RSUs that have not yet been granted but are contingently issuable under the share-based compensation programs is reflected in the weighted average diluted shares calculation by application of the treasury stock method at the beginning of the quarterly period in which all necessary conditions have been satisfied. Basic and Diluted Net Income Available to Common Unitholders per Unit Basic net income available to common unitholders per unit is computed by dividing net income available to the general partner and common unitholders, after the allocation of income to participating securities, by the weighted-average number of vested common units outstanding for the period. Diluted net income available to common unitholders per unit is computed by dividing net income available to the general partner and common unitholders, after the allocation of income to participating securities, by the sum of the weighted-average number of common units outstanding for the period plus the assumed exercise of all dilutive securities.
Fair Value Measurements	Fair Value Measurements The fair values of our financial assets and liabilities are disclosed in Note 20 “Fair Value Measurements and Disclosures,” to our consolidated financial statements. The only financial assets recorded at fair value on a recurring basis in our consolidated financial statements are the marketable securities held in connection with our Deferred Compensation Plan. We elected not to apply the fair value option for any of our eligible financial instruments or other items. We determine the estimated fair value of financial assets and liabilities utilizing a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions. This hierarchy requires the use of observable market data when available. The following is the fair value hierarchy: • Level 1 – quoted prices for identical instruments in active markets; • Level 2 – quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and • Level 3 – fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. We determine the fair value for the marketable securities using quoted prices in active markets for identical assets. Our other financial instruments, which are only disclosed at fair value, are comprised of certificates of deposit, secured debt, unsecured senior notes, unsecured revolving credit facility, and unsecured term loan facility. We generally determine the fair value of our secured debt, unsecured debt, unsecured revolving credit facility, and unsecured term loan facility by performing discounted cash flow analyses using an appropriate market discount rate. We calculate the market rate by obtaining period-end treasury rates for maturities that correspond to the maturities of our fixed-rate debt and then adding an appropriate credit spread based on information obtained from third-party financial institutions. These credit spreads take into account factors, including, but not limited to, our credit profile, the tenure of the debt, amortization period, whether the debt is secured or unsecured, and the loan-to-value ratio of the debt to the collateral. These calculations are significantly affected by the assumptions used, including the discount rate, credit spreads, and estimates of future cash flows. We calculate the market rate by obtaining Adjusted SOFR and then adding an appropriate credit spread based on our credit ratings and the terms of our unsecured line of credit agreement and our unsecured term loan. We determine the fair value of each of our publicly traded unsecured senior notes based on their quoted trading price at the end of the reporting period, if such prices are available. Carrying amounts of our cash and cash equivalents, restricted cash, certificates of deposit, and accounts payable approximate fair value due to their short-term maturities of 12 months or less.
Income Taxes	Income Taxes We have elected to be taxed as a REIT under Sections 856 through 860 of the Code. To qualify as a REIT, we must distribute annually at least 90% of our adjusted taxable income, as defined in the Code, to our stockholders and satisfy certain other organizational and operating requirements. We generally will not be subject to federal income taxes if we distribute 100% of our taxable income for each year to our stockholders. If we fail to qualify as a REIT in any taxable year, we will be subject to federal income taxes on our taxable income at regular corporate rates and we may not be able to qualify as a REIT for four subsequent taxable years. Even if we qualify for taxation as a REIT, we may be subject to certain state and local taxes on our income and property and to federal income taxes and excise taxes on our undistributed taxable income. We believe that we have met all of the REIT distribution and technical requirements for the years ended December 31, 2024, 2023, and 2022, and we were not subject to any federal income taxes (see Note 25 “Tax Treatment of Distributions” for additional information). We intend to continue to adhere to these requirements and maintain the Company’s REIT status. Accordingly, no provision for federal income taxes has been made in the accompanying financial statements. In addition, any taxable income from our taxable REIT subsidiaries are subject to federal, state, and local income taxes. For the years ended December 31, 2024, 2023, and 2022 the taxable REIT subsidiaries had de minimis taxable income.
Uncertain Tax Positions	Uncertain Tax Positions We include favorable tax positions in the calculation of tax liabilities if it is more likely than not that our adopted tax position will prevail if challenged by tax authorities.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reported periods. Actual results could differ from those estimates.
Segments	Segments We currently operate as one reportable segment. See Note 26 “Segments” for additional information.
Concentration of Credit Risk	Concentration of Credit Risk
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Accounting Pronouncements Adopted January 1, 2024 Effective for the annual period beginning January 1, 2024, we adopted Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2023-07 “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” ASU 2023-07 amends ASC 280 to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. The Company adopted this ASU in the current period and has included the required disclosures in Note 26 “Segments”. Accounting Pronouncements Effective 2025 and Beyond In December 2023, the FASB issued ASU 2023-09 “Income Taxes (Topic 740): Improvements to Tax Disclosures.” The ASU is effective for annual periods beginning after December 15, 2024. The Company does not currently anticipate that the guidance will have a material impact on our consolidated financial statements or notes to our consolidated financial statements. In November 2024, the FASB issued ASU 2024-03 “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” The ASU is effective for annual periods beginning after December 15, 2026. The Company is currently evaluating whether the guidance will have a material impact on our consolidated financial statements or notes to our consolidated financial statements.

Organization and Ownership (Tab

Organization and Ownership (Tables)	12 Months Ended
	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Real Estate Properties	Our stabilized portfolio of operating properties was comprised of the following properties at December 31, 2024: Number of Rentable Number of Percentage Occupied (unaudited) (1) Stabilized Office Properties (2) 123 17,142,721 428 82.8 % _______________________ (1) Represents economic occupancy for space where we have achieved revenue recognition for the associated lease agreements. (2) Includes stabilized life science and retail space. Number of Number of 2024 Average Occupancy (unaudited) Stabilized Residential Properties 3 1,001 92.5 % We did not have any properties or undeveloped land held for sale at December 31, 2024. As of December 31, 2024, the following properties were excluded from our stabilized portfolio: Number of Estimated Rentable Square Feet (1) (unaudited) In-process redevelopment projects - tenant improvement 2 100,000 In-process development projects - under construction 1 875,000 ____________________ (1) Estimated rentable square feet upon completion.

Basis of Presentation and Sig_3

Basis of Presentation and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Basis of Presentation and Significant Accounting Policies [Abstract]
Schedule of Buildings, Improvements, and Tenant Improvements Depreciation	The costs of buildings and improvements and tenant improvements are depreciated using the straight-line method of accounting over the estimated useful lives set forth in the table below. Depreciation expense for buildings and improvements for the three years ended December 31, 2024, 2023, and 2022 was $308.0 million, $300.1 million, and $287.8 million, respectively. Asset Description Depreciable Lives Buildings and improvements 25 – 40 years Tenant improvements 1 – 20 years (1) ____________________ (1)

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Acquisitions	During the year ended December 31, 2024, we acquired the operating property listed below from an unrelated third party. We did not acquire any operating properties during the year ended December 31, 2023. Property Date of Acquisition Number of Buildings Rentable Purchase Price (in millions) (1) 12707 & 12777 High Bluff Drive (Junction at Del Mar) September 27, 2024 2 103,731 $ 35.0 ________________________ (1)
Schedule of Estimated Fair Values of the Assets Acquired and Liabilities Assumed	The following table summarizes the estimated relative fair values of the assets acquired and liabilities assumed as of the date of acquisition, excluding acquisition-related costs: Total 2024 Operating Property Acquisitions (1)(2) Assets Land and improvements $ 6,000 Buildings and improvements (3) 15,703 Deferred leasing costs and acquisition-related intangible assets (4) 13,534 Prepaid expenses and other assets, net 30 Total assets acquired $ 35,267 Liabilities Acquisition-related intangible liabilities (5) $ 267 Total liabilities assumed 267 Net assets and liabilities acquired $ 35,000 ________________________ (1) As of December 31, 2024, this property was temporarily being held in a separate VIE to facilitate a potential future Section 1031 Exchange. See Note 2 “Basis of Presentation and Significant Accounting Policies” to our consolidated financial statements included in this report for additional information. (2) Excludes acquisition-related costs of $0.2 million. (3) Represents buildings, building improvements, and tenant improvements. (4) Represents in-place leases (approximately $10.5 million with a weighted average amortization period of 4.7 years), leasing commissions (approximately $2.0 million with a weighted average amortization period of 4.9 years), and an above-market lease (approximately $1.0 million with a weighted average amortization period of 4.6 years). (5) Represents below-market leases (approximately $0.3 million with a weighted average amortization period of 4.9 years).

Dispositions (Tables)

Dispositions (Tables)	12 Months Ended
	Dec. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Operating Properties and Land Dispositions	The following table summarizes the operating property sold during the year ended December 31, 2022: Location Month of Number of Buildings Rentable Sales Price (in millions) (1) 2022 Dispositions 3130 Wilshire Boulevard, Santa Monica, CA August 1 96,085 $ 48.0 Total 2022 Dispositions 1 96,085 $ 48.0 ____________________ (1) Represents gross sales price before broker commissions, closing costs, and purchase price credits.

Marketable Securities (Tables)

Marketable Securities (Tables)	12 Months Ended
	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Marketable Securities	Marketable securities consisted of the following at December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Deferred compensation plan assets $ 27,965 $ 28,089 Certificates of deposit (1) — 256,581 Total marketable securities $ 27,965 $ 284,670 ____________________ (1) The certificates of deposit had an original issuance term greater than three months but less than 12 months.

Receivables (Tables)

Receivables (Tables)	12 Months Ended
	Dec. 31, 2024
Receivables [Abstract]
Schedule of Current Receivables, Net	Current receivables, net is primarily comprised of contractual rents and other lease-related obligations due from tenants. The balance consisted of the following as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Current receivables $ 11,347 $ 15,176 Allowance for uncollectible tenant receivables (1) (314) (1,567) Current receivables, net $ 11,033 $ 13,609 ____________________ (1)
Schedule of Deferred Rent Receivables, Net	Deferred rent receivables, net consisted of the following as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Deferred rent receivables $ 451,996 $ 461,707 Allowance for deferred rent receivables (1) — (728) Deferred rent receivables, net $ 451,996 $ 460,979 ____________________ (1)

Deferred Leasing Costs and Ac_2

Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Identified Deferred Leasing Costs and Acquisition-Related Intangible Assets	The following table summarizes our deferred leasing costs and acquisition-related intangible assets (acquired value of leasing costs, above-market operating leases, and in-place leases) and intangible liabilities (acquired value of below-market operating leases) as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Deferred Leasing Costs and Acquisition-related Intangible Assets, net (1) : Deferred leasing costs $ 303,541 $ 297,871 Accumulated amortization (136,171) (122,680) Deferred leasing costs, net 167,370 175,191 Above-market operating leases 1,269 260 Accumulated amortization (156) (70) Above-market operating leases, net 1,113 190 In-place leases 78,979 70,247 Accumulated amortization (21,525) (15,923) In-place leases, net 57,454 54,324 Total deferred leasing costs and acquisition-related intangible assets, net $ 225,937 $ 229,705 Acquisition-related Intangible Liabilities, net: (2) Below-market operating leases $ 38,413 $ 39,159 Accumulated amortization (10,995) (8,402) Below-market operating leases, net 27,418 30,757 Total acquisition-related intangible liabilities, net $ 27,418 $ 30,757 ____________________ (1) Refer to Note 3 “Acquisitions” for a discussion of the acquisition-related intangible assets assumed in connection with our operating property acquisition in 2024. (2)
Schedule of Amortization for the Period Related to Deferred Leasing Costs and Acquisition-Related Intangibles	The following table sets forth amortization related to deferred leasing costs and acquisition-related intangibles for the years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) Deferred leasing costs $ 34,135 $ 31,771 $ 31,059 Above-market operating leases 86 31 31 In-place leases 7,453 15,878 31,647 Below-market operating leases (3,607) (6,679) (10,508) Total $ 38,067 $ 41,001 $ 52,229
Schedule of Estimated Annual Amortization Related to Deferred Leasing Costs and Acquisition-Related Intangibles	The following table sets forth the estimated annual amortization expense related to deferred leasing costs and acquisition-related intangibles as of December 31, 2024 for future periods: Year Ending Deferred Above-Market Operating Leases (1) In-Place Leases Below-Market Operating Leases (2) (in thousands) 2025 $ 30,699 $ 251 $ 9,057 $ (3,627) 2026 26,910 251 8,528 (3,533) 2027 23,610 251 6,976 (3,144) 2028 21,514 251 6,912 (2,962) 2029 18,855 105 5,884 (2,727) Thereafter 45,782 4 20,097 (11,425) Total $ 167,370 $ 1,113 $ 57,454 $ (27,418) ____________________ (1) Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations. (2) Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations.

Prepaid Expenses and Other As_2

Prepaid Expenses and Other Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Prepaid Expenses and Other Assets, Net	Prepaid expenses and other assets, net consisted of the following at December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Furniture, fixtures, and other long-lived assets, net $ 26,316 $ 37,073 Prepaid expenses and deferred financing costs, net (1) 21,162 10,532 Other assets 4,457 5,464 Total prepaid expenses and other assets, net $ 51,935 $ 53,069 ____________________ (1)

Secured and Unsecured Debt of_3

Secured and Unsecured Debt of the Operating Partnership (Tables) - Kilroy Realty L.P.	12 Months Ended
	Dec. 31, 2024
Debt Instrument [Line Items]
Schedule of Unsecured Revolving Credit and Term Loan Facility	The following table summarizes the balance and terms of our unsecured revolving credit facility as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Outstanding borrowings $ — $ — Remaining borrowing capacity (1) 1,100,000 1,100,000 Total borrowing capacity (1) $ 1,100,000 $ 1,100,000 Interest rate (2) 5.69 % 6.38 % Facility fee-annual rate (3) 0.250% 0.200% Maturity date (4) July 31, 2028 July 31, 2025 ____________________ (1) Remaining and total borrowing capacity are further reduced by the amount of our outstanding letters of credit which total approximately $5.2 million as of December 31, 2024 and December 31, 2023. 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 pursuant to the terms of the unsecured revolving credit facility. (2) Our unsecured revolving credit facility interest rate was calculated using the Secured Overnight Financing Rate (“SOFR”) plus a SOFR adjustment of 0.10% (“Adjusted SOFR”) and a margin of 1.100% and 0.900% based on our credit rating as of December 31, 2024 and 2023, respectively. We may be entitled to a temporary 0.01% reduction in the interest rate provided we meet certain sustainability goals with respect to the ongoing reduction of greenhouse gas emissions. (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 in connection with the amendment and restatement of the unsecured revolving credit facility. As of December 31, 2024 and 2023, $12.7 million and $3.2 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 maturity date of our unsecured revolving credit facility. (4) 2024 Term Loan Facility December 31, 2024 (in thousands) Outstanding borrowings $ 200,000 Remaining borrowing capacity — Total borrowing capacity (1) $ 200,000 Interest rate (2) 5.70 % Maturity date (3) October 3, 2025 ____________________ (1) We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $130.0 million as of December 31, 2024, under an accordion feature pursuant to the terms of the 2024 Term Loan Facility. (2) Our 2024 Term Loan Facility interest rate was calculated using Adjusted SOFR plus a margin of 1.200% based on our credit rating as of December 31, 2024. Additionally, we incurred debt origination and legal costs in connection with the amendment and restatement of the unsecured revolving credit facility. As of December 31, 2024, $1.2 million of unamortized deferred financing costs, inclusive of unamortized initial issuance costs transferred from the 2022 Term Loan Facility, remained to be amortized through the maturity date of the 2024 Term Loan Facility. (3) The maturity date may be extended by two 12-month periods, at the Operating Partnership’s election. 2022 Term Loan Facility December 31, 2023 (in thousands) Outstanding borrowings $ 520,000 Remaining borrowing capacity — Total borrowing capacity $ 520,000 Interest rate (1) 6.41 % Undrawn facility fee-annual rate (2) 0.200% Maturity date October 3, 2024 ____________________ (1) Our 2022 Term Loan Facility interest rate was calculated using Adjusted SOFR plus a margin of 0.950% based on our credit rating as of December 31, 2023. (2) Our undrawn facility fee was paid on a quarterly basis and was calculated based on the remaining borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs. As of December 31, 2023, $2.3 million of unamortized deferred financing costs remained to be amortized through the maturity date of our 2022 Term Loan Facility.
Schedule of Debt Maturities	The following table summarizes the stated debt maturities and scheduled amortization payments for all outstanding debt as of December 31, 2024: Year (in thousands) 2025 $ 606,246 2026 401,317 2027 249,125 2028 400,000 2029 475,000 Thereafter 2,500,000 Total aggregate principal value (1) $ 4,631,688 ________________________ (1) Includes gross principal balance of outstanding debt before the effect of the following at December 31, 2024: $25.5 million of unamortized deferred financing costs for the unsecured term loan facility, unsecured senior notes, and secured debt, and $8.4 million of unamortized discounts for the unsecured senior notes. Excludes unamortized deferred financing costs on the unsecured revolving credit facility, which are included in prepaid expenses and other assets, net on our consolidated balance sheets.
Schedule of Capitalized Interest and Loan Fees	The following table sets forth our gross interest expense and capitalized interest for the years ended December 31, 2024, 2023, and 2022. 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. Year Ended December 31, 2024 2023 2022 (in thousands) Gross interest expense $ 227,748 $ 192,983 $ 161,761 Capitalized interest (82,461) (78,767) (77,483) Interest expense $ 145,287 $ 114,216 $ 84,278
Secured debt
Debt Instrument [Line Items]
Schedule of Debt Balance and Significant Terms	The following table sets forth the composition of our secured debt as of December 31, 2024 and 2023: Annual Stated Interest Rate (1) GAAP Effective Rate (1)(2) Maturity Date December 31, Type of Debt 2024 2023 (in thousands) Mortgage note payable 3.57% 3.57% December 2026 $ 152,668 $ 156,386 Mortgage note payable (3) 4.48% 4.48% July 2027 79,020 81,308 Mortgage note payable 5.90% 5.90% August 2034 375,000 375,000 Total secured debt $ 606,688 $ 612,694 Unamortized deferred financing costs (8,489) (9,469) Total secured debt, net $ 598,199 $ 603,225 ____________________ (1) All interest rates presented are fixed-rate interest rates. (2) Represents the effective interest rate including the amortization of initial issuance discounts/premiums, excluding the amortization of deferred financing costs. (3)
Unsecured Senior Notes
Debt Instrument [Line Items]
Schedule of Debt Balance and Significant Terms	The following table summarizes the balance and significant terms of the registered unsecured senior notes issued by the Operating Partnership and outstanding, including unamortized discounts of $8.4 million and $5.3 million and unamortized deferred financing costs of $15.8 million and $15.9 million as of December 31, 2024 and 2023, respectively: Net Carrying Amount Issuance date Maturity date Stated Effective interest rate (1) 2024 2023 (in thousands) 4.300% Unsecured Senior Notes (2) July 2018 July 2026 4.300% 4.300% $ 50,000 $ 50,000 Unamortized discount and deferred financing costs (69) (113) Net carrying amount $ 49,931 $ 49,887 4.350% Unsecured Senior Notes (2) October 2018 October 2026 4.350% 4.350% $ 200,000 $ 200,000 Unamortized discount and deferred financing costs (314) (488) Net carrying amount $ 199,686 $ 199,512 3.350% Unsecured Senior Notes (3) February 2017 February 2027 3.350% 3.350% $ 175,000 $ 175,000 Unamortized discount and deferred financing costs (247) (363) Net carrying amount $ 174,753 $ 174,637 3.450% Unsecured Senior Notes (3) February 2017 February 2029 3.450% 3.450% $ 75,000 $ 75,000 Unamortized discount and deferred financing costs (176) (219) Net carrying amount $ 74,824 $ 74,781 4.270% Unsecured Senior Notes (2) April 2020 January 2031 4.270% 4.270% $ 350,000 $ 350,000 Unamortized discount and deferred financing costs (1,101) (1,282) Net carrying amount $ 348,899 $ 348,718 3.450% Unsecured Senior Notes (4) December 2017 December 2024 3.450% 3.470% $ — $ 403,712 Unamortized discount and deferred financing costs — (558) Net carrying amount $ — $ 403,154 4.375% Unsecured Senior Notes (5) September 2015 October 2025 4.375% 4.444% $ 400,000 $ 400,000 Unamortized discount and deferred financing costs (415) (969) Net carrying amount $ 399,585 $ 399,031 4.750% Unsecured Senior Notes (4) November 2018 December 2028 4.750% 4.800% $ 400,000 $ 400,000 Unamortized discount and deferred financing costs (1,973) (2,468) Net carrying amount $ 398,027 $ 397,532 4.250% Unsecured Senior Notes (6) July 2014 August 2029 4.250% 4.350% $ 400,000 $ 400,000 Unamortized discount and deferred financing costs (2,439) (2,971) Net carrying amount $ 397,561 $ 397,029 3.050% Unsecured Senior Notes (6) September 2019 February 2030 3.050% 3.064% $ 500,000 $ 500,000 Unamortized discount and deferred financing costs (3,036) (3,629) Net carrying amount $ 496,964 $ 496,371 2.500% Unsecured Senior Notes (7) August 2020 November 2032 2.500% 2.560% $ 425,000 $ 425,000 Unamortized discount and deferred financing costs (4,201) (4,735) Net carrying amount $ 420,799 $ 420,265 2.650% Unsecured Senior Notes (7) October 2021 November 2033 2.650% 2.654% $ 450,000 $ 450,000 Unamortized discount and deferred financing costs (3,075) (3,422) Net carrying amount $ 446,925 $ 446,578 6.250% Unsecured Senior Notes (8) January 2024 January 2036 6.250% 6.385% $ 400,000 $ — Unamortized discount and deferred financing costs (7,159) — Net carrying amount $ 392,841 $ — Total Unsecured Senior Notes, Net $ 3,800,795 $ 3,807,495 ____________________ (1) Represents the effective interest rate including the amortization of initial issuance discounts, excluding the amortization of deferred financing costs. (2) Interest on these notes is payable semi-annually in arrears on April 18th and October 18th of each year. (3) Interest on these notes is payable semi-annually in arrears on February 17th and August 17th of each year. (4) Interest on these notes is payable semi-annually in arrears on June 15th and December 15th of each year. (5) Interest on these notes is payable semi-annually in arrears on April 1st and October 1st of each year. (6) Interest on these notes is payable semi-annually in arrears on February 15th and August 15th of each year. (7) Interest on these notes is payable semi-annually in arrears on May 15th and November 15th of each year. (8) Interest on these notes is payable semi-annually in arrears on January 15th and July 15th of each year.

Deferred Revenue and Acquisit_2

Deferred Revenue and Acquisition-Related Intangible Liabilities, net (Tables)	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Deferred Revenue and Acquisition-Related Liabilities	Deferred revenue and acquisition-related intangible liabilities, net consisted of the following at December 31, 2024 and 2023: December 31, 2024 2023 (in thousands) Deferred revenue related to tenant-funded tenant improvements $ 81,738 $ 97,802 Other deferred revenue 33,281 45,079 Acquisition-related intangible liabilities, net (1) 27,418 30,757 Total $ 142,437 $ 173,638 _____________________ (1) See Note 7 “Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net” for additional information regarding our acquisition-related intangible liabilities.
Schedule of Estimated Amortization of Deferred Revenue Related to Tenant-Funded Improvements	The following is the estimated amortization of deferred revenue related to tenant-funded tenant improvements as of December 31, 2024 for the next five years and thereafter: Year Ending (in thousands) 2025 $ 14,758 2026 12,754 2027 10,727 2028 9,821 2029 9,099 Thereafter 24,579 Total $ 81,738

Stockholders' Equity of the C_2

Stockholders' Equity of the Company (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Schedule of Accrued Dividends and Distributions	The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock and noncontrolling units as of December 31, 2024 and 2023: December 31, 2024 2023 (in thousands) Dividends and Distributions payable to: Common stockholders $ 63,745 $ 63,309 Noncontrolling common unitholders of the Operating Partnership 621 621 RSU holders (1) 484 510 Total accrued dividends and distribution to common stockholders and noncontrolling unitholders $ 64,850 $ 64,440 _____________________ (1) The amount includes the value of the dividend equivalents that will be paid with additional RSUs (see Note 16 “Share-Based and Other Compensation” for additional information).
Schedule of Outstanding Shares of Common Stock, Preferred Stock and Noncontrolling Units	December 31, 2024 2023 Outstanding Shares and Units: Common stock 118,046,674 117,239,558 Noncontrolling common units 1,150,574 1,150,574 RSUs (1) 861,385 908,336 _____________________ (1) The amount includes nonvested RSUs. Does not include 828,442 and 1,083,086 market measure-based RSUs because not all the necessary performance conditions have been met as of December 31, 2024 and 2023, respectively. Refer to Note 16 “Share-Based and Other Compensation” for additional information.

Partners' Capital of the Oper_2

Partners' Capital of the Operating Partnership (Tables)	12 Months Ended
	Dec. 31, 2024
Class of Stock [Line Items]
Schedule of Accrued Dividends and Distributions	The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock and noncontrolling units as of December 31, 2024 and 2023: December 31, 2024 2023 (in thousands) Dividends and Distributions payable to: Common stockholders $ 63,745 $ 63,309 Noncontrolling common unitholders of the Operating Partnership 621 621 RSU holders (1) 484 510 Total accrued dividends and distribution to common stockholders and noncontrolling unitholders $ 64,850 $ 64,440 _____________________ (1) The amount includes the value of the dividend equivalents that will be paid with additional RSUs (see Note 16 “Share-Based and Other Compensation” for additional information).
Schedule of Outstanding Shares of Common Stock, Preferred Stock and Noncontrolling Units	December 31, 2024 2023 Outstanding Shares and Units: Common stock 118,046,674 117,239,558 Noncontrolling common units 1,150,574 1,150,574 RSUs (1) 861,385 908,336 _____________________ (1) The amount includes nonvested RSUs. Does not include 828,442 and 1,083,086 market measure-based RSUs because not all the necessary performance conditions have been met as of December 31, 2024 and 2023, respectively. Refer to Note 16 “Share-Based and Other Compensation” for additional information.
Kilroy Realty L.P.
Class of Stock [Line Items]
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 a former executive officer and director in the form of common limited partner units as well as the ownership interest held on each respective date: December 31, 2024 December 31, 2023 Company owned common units in the Operating Partnership 118,046,674 117,239,558 Company owned general partnership interest 99.0 % 99.0 % Non-affiliated investors and other common units of the Operating Partnership 1,150,574 1,150,574 Ownership interest of limited partnership interests 1.0 % 1.0 %
Schedule of Accrued Dividends and Distributions	The following tables summarize accrued distributions for the noted common units as of December 31, 2024 and 2023: December 31, 2024 December 31, 2023 (in thousands) Distributions payable to: General partner $ 63,745 $ 63,309 Common limited partners 621 621 RSU holders (1) 484 510 Total accrued distributions to common unitholders $ 64,850 $ 64,440 _____________________ (1) The amount includes the value of the dividend equivalents that will be paid with additional RSUs (see Note 16 “Share-Based and Other Compensation” for additional information).
Schedule of Outstanding Shares of Common Stock, Preferred Stock and Noncontrolling Units	December 31, 2024 December 31, 2023 Outstanding Units: Common units held by the general partner 118,046,674 117,239,558 Common units held by the limited partners 1,150,574 1,150,574 RSUs (1) 861,385 908,336 _____________________ (1)

Share-Based and Other Compens_2

Share-Based and Other Compensation (Tables)	12 Months Ended
	Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Restricted Stock Units Valuation Assumptions	The total fair value of the Time-Based RSUs is based on the Company’s closing share price on the NYSE on the respective fair valuation dates as detailed in the table below: 2024 Time-Based RSU Grant (1) 2023 Time-Based RSU Grant 2022 Time-Based RSU Grant Service vesting period February 1, 2024 - January 5, 2027 February 6, 2023 - January 5, 2026 January 28, 2022 - January 5, 2025 RSUs granted 236,389 217,059 158,170 Fair value on valuation date (in millions) $ 8.3 $ 8.6 $ 10.0 Weighted average fair value per share $ 35.20 $ 39.65 $ 63.05 Date of valuation February 1, 2024 February 6, 2023 January 28, 2022 ____________________ (1) Excludes initial Time-Based RSUs granted to the Company’s current CEO and CFO in 2024, as mentioned above.
2022, 2021 and 2020 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Restricted Stock Units Valuation Assumptions	The following table summarizes the estimated number of RSUs earned for the 2024 and 2023 Performance-Based RSUs and the actual number of RSUs earned for the 2022 Performance-Based RSUs and the assumptions utilized in the Monte Carlo simulation pricing models: 2024 2023 2022 Service vesting period February 1, 2024 - January, 2027 February 6, 2023 - January, 2026 January 28, 2022 - January, 2025 Target RSUs granted 265,205 300,007 193,111 Estimated RSUs earned (1)(2) 416,451 705,267 396,736 Fair Value Assumptions: Valuation date February 1, 2024 February 6, 2023 January 28, 2022 Fair value on valuation date (in millions) $9.5 $12.0 $12.7 Fair value per share on valuation date (3) $36.00 $40.10 $67.62 Expected share price volatility 34.0 % 35.0 % 36.0 % Risk-free interest rate 3.98 % 4.12 % 1.35 % _____________________ (1) Estimated RSUs earned for the 2024 Performance-Based RSUs are based on the actual achievement of the 2024 FFO Performance Condition and assumes the target level of achievement for the 2024 Net Debt to EBITDA Ratio Performance Condition and the target level of achievement of the 2024 Market Condition. Estimated RSUs earned for the 2023 Performance-Based RSUs are based on the actual achievement of the 2023 FFO Performance Condition and assume target level achievement of the 2023 Market Condition and maximum level of achievement of the 2023 Net Debt to EBITDA Ratio Performance Condition. The 2022 Performance-Based RSUs earned are based on actual performance of the 2022 Performance Conditions and the 2022 Market Condition. (2) For one participant, the 2022 and 2023 Market Condition is based on actual performance through the accelerated vesting of January 21, 2024. (3) For one participant, the fair value per share on the valuation date for their 2024, 2023, and 2022 Performance-Based RSUs is $36.43, $40.43 and $70.00, respectively.
Market measure-based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Restricted Stock Units Award Activity	A summary of our performance and market-measure based RSU activity from January 1, 2024 through December 31, 2024 is presented below: Nonvested RSUs Vested RSUs Total RSUs Amount Weighted-Average Outstanding at January 1, 2024 1,083,086 $ 52.47 23,583 1,106,669 Granted 416,451 35.67 354,542 770,993 Vested (702,187) 53.39 702,187 — Settled (1) — — (1,032,183) (1,032,183) Issuance of dividend equivalents (2) 48,673 34.67 33,150 81,823 Canceled (17,581) 38.64 (5) (17,586) Outstanding as of December 31, 2024 (3) 828,442 $ 42.49 81,274 909,716 ____________________ (1) Represents vested RSUs that were settled in shares of the Company’s common stock. Total shares settled include 517,475 shares, primarily for one participant, that were tendered in accordance with the terms of the 2006 Plan to satisfy minimum statutory tax withholding requirements related to the RSUs settled. We accept the return of RSUs at the current quoted closing share price of the Company’s common stock to satisfy tax obligations. (2) Represents the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreement. (3) Outstanding RSUs as of December 31, 2024 represent the actual achievement of the FFO performance conditions and assumes target levels for the market and other performance conditions. The number of restricted stock units ultimately earned is subject to change based upon actual performance over the three-year vesting period. Dividend equivalents earned will vest along with the underlying award and are also subject to changes based on the number of RSUs ultimately earned for each underlying award. A summary of our performance and market-measure based RSU activity for the years ended December 31, 2024, 2023, and 2022 is presented below: RSUs Granted RSUs Vested Years ended December 31, Non-Vested RSUs Granted (1) Weighted-Average Vested RSUs Total Vest-Date 2024 416,451 $ 35.67 (1,089,879) $ 38,364 2023 483,113 $ 39.65 (290,570) $ 11,105 2022 310,484 $ 63.05 (241,184) $ 15,200 ____________________ (1)
RSUs granted
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Restricted Stock Units Award Activity	A summary of our time-based RSU activity from January 1, 2024 through December 31, 2024 is presented below: Nonvested RSUs Vested RSUs Total RSUs Amount Weighted Average Outstanding at January 1, 2024 401,310 $ 43.86 483,443 884,753 Granted 385,718 36.12 — 385,718 Vested (250,952) 47.15 250,952 — Settled (1) — — (516,154) (516,154) Issuance of dividend equivalents (2) 28,519 32.97 30,216 58,735 Forfeited (27,169) 40.42 — (27,169) Canceled (3) — — (5,772) (5,772) Outstanding as of December 31, 2024 537,426 $ 36.37 242,685 780,111 ____________________ (1) Represents vested RSUs that were settled in shares of the Company’s common stock. Total shares settled include 229,447 shares, primarily for one participant, that were tendered in accordance with the terms of the 2006 Plan to satisfy minimum statutory tax withholding requirements related to the RSUs settled. We accept the return of RSUs at the current quoted closing share price of the Company’s common stock to satisfy tax obligations. (2) Represents the issuance of dividend equivalents earned on the underlying RSUs. The dividend equivalents vest based on terms specified under the related RSU award agreement. (3) For shares vested but not yet settled, we accept the return of RSUs at the current quoted closing share price of the Company’s common stock to satisfy minimum statutory tax-withholding requirements related to either the settlement or vesting of RSUs in accordance with the terms of the 2006 Plan. A summary of our time-based RSU activity for the years ended December 31, 2024, 2023, and 2022 is presented below: RSUs Granted RSUs Vested Year ended December 31, Non-Vested Weighted-Average Grant Date Vested RSUs Total Vest-Date Fair Value (1) (in thousands) 2024 385,718 $ 36.12 (281,168) $ 10,878 2023 247,017 $ 38.12 (343,334) $ 12,425 2022 177,099 $ 62.58 (294,867) $ 19,890 ____________________

Rental Income and Future Mini_2

Rental Income and Future Minimum Rent (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Schedule of Rental Income	The table below sets forth the allocation of rental income between fixed and variable payments and net collectability reversals for the years ended December 31, 2024 and 2023: Year Ended December 31, 2024 2023 Fixed lease payments $ 923,029 $ 944,618 Variable lease payments 197,502 184,672 Net collectability reversals (1) (2,416) (11,553) Total rental income $ 1,118,115 $ 1,117,737 ____________________ (1)
Schedule of 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 December 31, 2024 for future periods is summarized as follows: Year Ending (in thousands) 2025 $ 819,139 2026 787,062 2027 742,917 2028 703,798 2029 614,718 Thereafter 1,608,063 Total (1) $ 5,275,697 ____________________ (1) Excludes residential leases and leases with a term of one year or less.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of Contractual Expiration Dates for Ground Leases	The following table summarizes our properties that are held subject to long-term non-cancellable ground lease obligations as of December 31, 2024 and the respective contractual expiration dates: Property Contractual Expiration Date 701, 801, and 837 N. 34th Street, Seattle, WA (1) December 2041 1701 Page Mill Road and 3150 Porter Drive, Palo Alto, CA December 2067 Kilroy Airport Center Phases I, II, and III, Long Beach, CA (2) July 2084 3243 S. La Cienega Boulevard, Los Angeles, CA October 2106 200 W. 6th Street, Austin, TX December 2112 ____________________ (1) The Company has three 10-year and one 45-year extension options for this Seattle ground lease, which if exercised would extend the expiration date to December 2116. These extension options are not assumed to be exercised in our calculation of the present value of the future minimum lease payments for this lease. The Company also has a purchase option for this ground lease. (2) Assumes the impact of all extension options held by the Company.
Schedule of Minimum Commitment Under Ground Leases	The minimum commitment under our ground leases as of December 31, 2024 for future periods is as follows: Year Ending (in thousands) 2025 $ 6,772 2026 6,809 2027 6,850 2028 6,869 2029 6,869 Thereafter 367,744 Total undiscounted cash flows (1)(2)(3)(4)(5)(6) $ 401,913 Present value discount (273,491) Ground lease liabilities $ 128,422 ________________________ (1) Excludes contingent future rent payments based on gross income or adjusted gross income and reflects the minimum obligations under the ground leases including any extension options (but excludes the Seattle ground lease extension options). (2) Our 701, 801 and 837 N. 34th Street ground lease obligation is subject to a fair market value adjustment every five years. The contractual obligations for that lease included above assume the current annual ground lease obligation in effect at December 31, 2024 for the remainder of the lease term, as we cannot predict future adjustments. (3) Our Kilroy Airport Center Phases I, II, and III ground lease obligation is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals limited to maximum increases annually. The contractual obligations for that lease included above assume the contractual minimum annual rent prior to the consideration of any variable rental payments in effect at December 31, 2024 for the remainder of the lease term, as we cannot predict future adjustments. (4) Our 1701 Page Mill Road and 3150 Porter Drive ground lease obligation includes a component that is based on the percentage of adjusted gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every 10 years by an amount equal to 60% of the average annual percentage rent for the previous three years. The contractual obligations for this lease included above assume the current annual ground lease obligation in effect at December 31, 2024 for the remainder of the lease term, as we cannot predict future adjustments. (5) Our 3243 S. La Cienega Boulevard ground lease obligation is subject to fixed 5% ground rent increases every five years, with the next increase occurring on November 1, 2027. (6) Our 200 W. 6th Street ground lease obligation is subject to fixed 2% ground rent increases every year, with ground rent resets occurring every ten years based on CPI. The contractual obligations for that lease included above assume increases for the remaining current ten-year period based on the contractual minimum annual rent prior to the consideration of any variable rental payments in effect at December 31, 2024.

Fair Value Measurements and D_2

Fair Value Measurements and Disclosures (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value of the Company's Deferred Compensation Plan Assets	The following table sets forth the fair value of our Deferred Compensation Plan assets as of December 31, 2024 and 2023: Fair Value (Level 1) (1) 2024 2023 Description (in thousands) Deferred Compensation Plan assets (2) $ 27,965 $ 28,089 ____________________ (1) Based on quoted prices in active markets for identical securities. (2) The Deferred Compensation Plan assets are held in a limited rabbi trust.
Schedule of 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 December 31, 2024 and 2023: December 31, 2024 2023 Carrying Value Fair Value (1) Carrying Value Fair Value (1) (in thousands) Assets Certificates of deposit (2) $ — $ — $ 256,581 $ 256,581 Liabilities Secured debt, net $ 598,199 $ 569,061 $ 603,225 $ 585,826 Unsecured debt, net 3,999,566 3,681,914 4,325,153 3,927,104 _______________ (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. (2)

Net Income Available to Commo_3

Net Income Available to Common Stockholders Per Share of the Company (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Schedule of 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 years ended December 31, 2024, 2023, and 2022: Year Ended December 31, 2024 2023 2022 (in thousands, except unit and per unit amounts) Numerator: Net income available to common stockholders $ 210,969 $ 212,241 $ 232,615 Allocation to participating securities (1) (1,967) (1,233) (1,272) Numerator for basic and diluted net income available to common stockholders $ 209,002 $ 211,008 $ 231,343 Denominator: Basic weighted average vested shares outstanding 117,649,111 117,160,173 116,806,575 Effect of dilutive securities 507,876 346,082 413,472 Diluted weighted average vested shares and common stock equivalents outstanding 118,156,987 117,506,255 117,220,047 Basic earnings per share: Net income available to common stockholders per share $ 1.78 $ 1.80 $ 1.98 Diluted earnings per share: Net income available to common stockholders per share $ 1.77 $ 1.80 $ 1.97 _____________________ (1) Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs.

Net Income Available to Commo_4

Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Tables)	12 Months Ended
	Dec. 31, 2024
Net Income Available To Common Unitholders [Line Items]
Schedule of Net income Available to Common Unitholders	The following table reconciles the numerator and denominator in computing the Company’s basic and diluted per-share computations for net income available to common stockholders for the years ended December 31, 2024, 2023, and 2022: Year Ended December 31, 2024 2023 2022 (in thousands, except unit and per unit amounts) Numerator: Net income available to common stockholders $ 210,969 $ 212,241 $ 232,615 Allocation to participating securities (1) (1,967) (1,233) (1,272) Numerator for basic and diluted net income available to common stockholders $ 209,002 $ 211,008 $ 231,343 Denominator: Basic weighted average vested shares outstanding 117,649,111 117,160,173 116,806,575 Effect of dilutive securities 507,876 346,082 413,472 Diluted weighted average vested shares and common stock equivalents outstanding 118,156,987 117,506,255 117,220,047 Basic earnings per share: Net income available to common stockholders per share $ 1.78 $ 1.80 $ 1.98 Diluted earnings per share: Net income available to common stockholders per share $ 1.77 $ 1.80 $ 1.97 _____________________ (1) Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs.
Kilroy Realty L.P.
Net Income Available To Common Unitholders [Line Items]
Schedule of Net income Available to Common Unitholders	The following table reconciles the numerator and denominator in computing the Operating Partnership’s basic and diluted per-unit computations for net income available to common unitholders for the years ended December 31, 2024, 2023, and 2022: Year Ended December 31, 2024 2023 2022 (in thousands, except unit and per unit amounts) Numerator: Net income available to common unitholders $ 213,031 $ 214,324 $ 234,898 Allocation to participating securities (1) (1,967) (1,233) (1,272) Numerator for basic and diluted net income available to common unitholders $ 211,064 $ 213,091 $ 233,626 Denominator: Basic weighted average vested units outstanding 118,799,685 118,310,747 117,957,149 Effect of dilutive securities 507,876 346,082 413,472 Diluted weighted average vested units and common unit equivalents outstanding 119,307,561 118,656,829 118,370,621 Basic earnings per unit: Net income available to common unitholders per unit $ 1.78 $ 1.80 $ 1.98 Diluted earnings per unit: Net income available to common unitholders per unit $ 1.77 $ 1.80 $ 1.97 ____________________ (1) Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs.

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information of the Company (Tables)	12 Months Ended
	Dec. 31, 2024
Supplemental Cash Flow Elements [Abstract]
Schedule of Supplemental Cash Flows	Supplemental cash flows information as follows (in thousands): Year Ended December 31, 2024 2023 2022 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $77,871, $74,052, and $72,973 as of December 31, 2024, 2023 , and 2022, respectively $ 126,668 $ 105,767 $ 79,634 Cash paid for amounts included in the measurement of ground lease liabilities $ 6,484 $ 6,733 $ 6,447 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 54,190 $ 95,575 $ 97,729 Tenant improvements funded directly by tenants $ 2,745 $ 7,364 $ 6,772 Remeasurement of ground lease liability and related right of use ground lease asset $ 4,782 $ — $ — NON-CASH FINANCING TRANSACTIONS: Accrual of dividends and distributions payable to common stockholders and common unitholders (Notes 14) $ 64,850 $ 64,440 $ 64,285
Schedule of 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 years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 510,163 $ 347,379 $ 414,077 Restricted cash at beginning of period — — 13,006 Cash and cash equivalents and restricted cash at beginning of period $ 510,163 $ 347,379 $ 427,083 Cash and cash equivalents at end of period $ 165,690 $ 510,163 $ 347,379 Restricted cash at end of period — — — Cash and cash equivalents and restricted cash at end of period $ 165,690 $ 510,163 $ 347,379
Schedule of 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 years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 510,163 $ 347,379 $ 414,077 Restricted cash at beginning of period — — 13,006 Cash and cash equivalents and restricted cash at beginning of period $ 510,163 $ 347,379 $ 427,083 Cash and cash equivalents at end of period $ 165,690 $ 510,163 $ 347,379 Restricted cash at end of period — — — Cash and cash equivalents and restricted cash at end of period $ 165,690 $ 510,163 $ 347,379

Supplemental Cash Flow Inform_4

Supplemental Cash Flow Information of the Operating Partnership (Tables)	12 Months Ended
	Dec. 31, 2024
Other Significant Noncash Transactions [Line Items]
Schedule of Supplemental Cash Flows	Supplemental cash flows information as follows (in thousands): Year Ended December 31, 2024 2023 2022 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $77,871, $74,052, and $72,973 as of December 31, 2024, 2023 , and 2022, respectively $ 126,668 $ 105,767 $ 79,634 Cash paid for amounts included in the measurement of ground lease liabilities $ 6,484 $ 6,733 $ 6,447 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 54,190 $ 95,575 $ 97,729 Tenant improvements funded directly by tenants $ 2,745 $ 7,364 $ 6,772 Remeasurement of ground lease liability and related right of use ground lease asset $ 4,782 $ — $ — NON-CASH FINANCING TRANSACTIONS: Accrual of dividends and distributions payable to common stockholders and common unitholders (Notes 14) $ 64,850 $ 64,440 $ 64,285
Schedule of 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 years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 510,163 $ 347,379 $ 414,077 Restricted cash at beginning of period — — 13,006 Cash and cash equivalents and restricted cash at beginning of period $ 510,163 $ 347,379 $ 427,083 Cash and cash equivalents at end of period $ 165,690 $ 510,163 $ 347,379 Restricted cash at end of period — — — Cash and cash equivalents and restricted cash at end of period $ 165,690 $ 510,163 $ 347,379
Schedule of 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 years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 510,163 $ 347,379 $ 414,077 Restricted cash at beginning of period — — 13,006 Cash and cash equivalents and restricted cash at beginning of period $ 510,163 $ 347,379 $ 427,083 Cash and cash equivalents at end of period $ 165,690 $ 510,163 $ 347,379 Restricted cash at end of period — — — Cash and cash equivalents and restricted cash at end of period $ 165,690 $ 510,163 $ 347,379
Kilroy Realty L.P.
Other Significant Noncash Transactions [Line Items]
Schedule of Supplemental Cash Flows	Supplemental cash flows information as follows (in thousands): Year Ended December 31, 2024 2023 2022 SUPPLEMENTAL CASH FLOWS INFORMATION: Cash paid for interest, net of capitalized interest of $77,871, $74,052, and $72,973 as of December 31, 2024, 2023, and 2022, respectively $ 126,668 $ 105,767 $ 79,634 Cash paid for amounts included in the measurement of ground lease liabilities $ 6,484 $ 6,733 $ 6,447 NON-CASH INVESTING TRANSACTIONS: Accrual for expenditures for operating properties and development and redevelopment properties $ 54,190 $ 95,575 $ 97,729 Tenant improvements funded directly by tenants $ 2,745 $ 7,364 $ 6,772 Remeasurement of ground lease liability and related right of use ground lease asset $ 4,782 $ — $ — NON-CASH FINANCING TRANSACTIONS: Accrual of distributions payable to common unitholders (Note 15) $ 64,850 $ 64,440 $ 64,285
Schedule of 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 years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 510,163 $ 347,379 $ 414,077 Restricted cash at beginning of period — — 13,006 Cash and cash equivalents and restricted cash at beginning of period $ 510,163 $ 347,379 $ 427,083 Cash and cash equivalents at end of period $ 165,690 $ 510,163 $ 347,379 Restricted cash at end of period — — — Cash and cash equivalents and restricted cash at end of period $ 165,690 $ 510,163 $ 347,379
Schedule of 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 years ended December 31, 2024, 2023, and 2022. Year Ended December 31, 2024 2023 2022 (in thousands) RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH: Cash and cash equivalents at beginning of period $ 510,163 $ 347,379 $ 414,077 Restricted cash at beginning of period — — 13,006 Cash and cash equivalents and restricted cash at beginning of period $ 510,163 $ 347,379 $ 427,083 Cash and cash equivalents at end of period $ 165,690 $ 510,163 $ 347,379 Restricted cash at end of period — — — Cash and cash equivalents and restricted cash at end of period $ 165,690 $ 510,163 $ 347,379

Tax Treatment of Distributions

Tax Treatment of Distributions (Tables)	12 Months Ended
	Dec. 31, 2024
Class of Stock [Line Items]
Schedule of Reconciliation of Dividends Declared to Dividends Paid	The following table reconciles the dividends declared per share of common stock to the dividends paid per share of common stock during the years ended December 31, 2024, 2023, and 2022 as follows: Year Ended December 31, Dividends 2024 2023 2022 Dividends declared per share of common stock $ 2.160 $ 2.160 $ 2.120 Less: Dividends declared in the current year and paid in the following year (0.540) (0.540) (0.540) Add: Dividends declared in the prior year and paid in the current year 0.540 0.540 0.520 Dividends paid per share of common stock $ 2.160 $ 2.160 $ 2.100
Common Stock
Class of Stock [Line Items]
Schedule of Reconciliation of Dividends Declared to Dividends Paid	The unaudited income tax treatment for the dividends to common stockholders reportable for the years ended December 31, 2024, 2023, and 2022 as identified in the table above was as follows: Year Ended December 31, Shares of Common Stock 2024 2023 2022 Ordinary income (1) $ 1.916 88.70 % $ 2.087 96.63 % $ 1.865 88.80 % Qualified dividend 0.001 0.05 % 0.001 0.04 % 0.001 0.02 % Return of capital 0.238 11.02 % 0.069 3.21 % 0.230 10.99 % Capital gains (2) 0.005 0.23 % 0.003 0.12 % 0.004 0.19 % Unrecaptured section 1250 gains — — % — — % — — % $ 2.160 100.00 % $ 2.160 100.00 % $ 2.100 100.00 % ____________________ (1) The Tax Cuts and Jobs Act enacted on December 22, 2017 generally allows a deduction for noncorporate taxpayers equal to 20% of ordinary dividends distributed by a REIT (excluding capital gain dividends and qualified dividend income). The amount of dividend eligible for this deduction is referred to as the Section 199A Dividend. For the year ended December 31, 2024, the Section 199A Dividend is equal to the total ordinary income dividend. (2) Capital gains are comprised entirely of 20% rate gains.

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information	The following table presents Net Income for the years ended December 31, 2024, 2023, and 2022: Year Ended December 31, 2024 2023 2022 REVENUES: Rental income $ 1,118,115 $ 1,117,737 $ 1,086,018 Other property income 17,514 11,957 10,969 Total revenues 1,135,629 1,129,694 1,096,987 EXPENSES: Property expenses 243,441 228,964 202,744 Real estate taxes 108,951 105,868 105,869 Ground leases 11,715 9,732 7,565 General and administrative expenses 72,066 93,434 93,642 Leasing costs 8,764 6,506 4,879 Depreciation and amortization 356,182 355,278 357,611 Total expenses 801,119 799,782 772,310 OTHER INCOME (EXPENSES) : Interest and other income, net 37,752 22,592 1,765 Interest expense (145,287) (114,216) (84,278) Gains on sales of depreciable operating properties — — 17,329 Gain on sales of long-lived assets 5,979 — — Total other (expenses) income (101,556) (91,624) (65,184) NET INCOME $ 232,954 $ 238,288 $ 259,493

Organization and Ownership - Op

Organization and Ownership - Operating Properties (Details)	12 Months Ended
	Dec. 31, 2024 ft² property building tenant development_project redevelopmentProject
Real Estate Properties [Line Items]
Rentable Square Feet (unaudited)	17,142,721
Stabilized Office Properties
Real Estate Properties [Line Items]
Number of Buildings | building	123
Rentable Square Feet (unaudited)	17,142,721
Number of Tenants | tenant	428
Percentage Occupied (unaudited)	82.80%
Stabilized Residential Properties
Real Estate Properties [Line Items]
Number of Properties | property	3
Number of Units | property	1,001
2024 Average Occupancy (unaudited)	92.50%
In-process redevelopment projects - tenant improvement
Real Estate Properties [Line Items]
Rentable Square Feet (unaudited)	100,000
Number of Properties | redevelopmentProject	2
In-process development projects - tenant improvement
Real Estate Properties [Line Items]
Rentable Square Feet (unaudited)	875,000
Number of Properties | development_project	1

Organization and Ownership - Na

Organization and Ownership - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 a ft² property development_site building property_partnership	Dec. 31, 2023
Real Estate Properties [Line Items]
Lease-up properties occupancy percentage	95%
Lease-up properties occupancy duration	1 year
Rentable square feet | ft²	17,142,721
100 First LLC and 303 Second LLC
Real Estate Properties [Line Items]
Company owned general partnership interest	56%
Redwood LLC
Real Estate Properties [Line Items]
Company owned general partnership interest	93%
Operating Partnership
Real Estate Properties [Line Items]
Ownership interest (percent)	99%	99%
Operating Partnership | Non-Affiliated Investors and Certain Executive Officer and Directors
Real Estate Properties [Line Items]
Ownership interest (percent)	1%	1%
San Francisco, California
Real Estate Properties [Line Items]
Number of properties	1
Redwood City, California | Redwood LLC
Real Estate Properties [Line Items]
Number of properties	2
Future Development Site
Real Estate Properties [Line Items]
Number of future development sites | development_site	8
Area of undeveloped land | a	64
Stabilized Office Properties
Real Estate Properties [Line Items]
Number of buildings | building	123
Rentable square feet | ft²	17,142,721
Stabilized Office Properties | Washington
Real Estate Properties [Line Items]
Number of properties	10
Stabilized Office Properties | Texas
Real Estate Properties [Line Items]
Number of properties	1
Future development project | Washington
Real Estate Properties [Line Items]
Number of properties | development_site	1
Future development project | Texas
Real Estate Properties [Line Items]
Number of properties | development_site	1
Properties and development projects
Real Estate Properties [Line Items]
Property ownership percentage	100%
Office Properties Owned by Consolidated Property Partnerships
Real Estate Properties [Line Items]
Number of properties	4
Consolidated property partnerships
Real Estate Properties [Line Items]
Number of property partnerships | property_partnership	3
Consolidated Property Partnerships Owning Office Properties Through REITs | 100 First LLC and 303 Second LLC
Real Estate Properties [Line Items]
Number of property partnerships | property_partnership	2

Basis of Presentation and Sig_4

Basis of Presentation and Significant Accounting Policies - Narrative (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2024 variableInterestEntity	Dec. 31, 2024 USD ($) property variableInterestEntity development_site building investment	Dec. 31, 2024 USD ($) property variableInterestEntity development_site building investment property_partnership	Dec. 31, 2024 USD ($) property variableInterestEntity development_site building investment	Dec. 31, 2024 USD ($) property variableInterestEntity reportableSegment development_site building investment	Dec. 31, 2024 USD ($) operatingSegment property variableInterestEntity development_site building investment	Dec. 31, 2023 USD ($) building variableInterestEntity property investment	Dec. 31, 2022 USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Assets		$ 10,898,357,000	$ 10,898,357,000	$ 10,898,357,000	$ 10,898,357,000	$ 10,898,357,000	$ 11,401,045,000
Liabilities		5,289,488,000	5,289,488,000	5,289,488,000	5,289,488,000	5,289,488,000	5,741,352,000
Noncontrolling interest in consolidated subsidiary		$ 174,351,000	$ 174,351,000	$ 174,351,000	$ 174,351,000	$ 174,351,000	$ 178,257,000
Number of equity method investments | investment		0	0	0	0	0	0
Capitalized acquisition costs		$ 200,000	$ 200,000	$ 200,000	$ 200,000	$ 200,000	$ 0	$ 200,000
Number of properties classified as held for sale | property		0	0	0	0	0	0
Number of consolidated property partnerships | property_partnership			3
Conversion ratio				1
Income tax provision		$ 0					$ 0	0
Number of operating segments					1	1
Percentage of redevelopment projects				100%
Lease Agreements | Minimum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Finite-lived intangible asset, useful life		1 year	1 year	1 year	1 year	1 year
Lease Agreements | Maximum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Finite-lived intangible asset, useful life		20 years	20 years	20 years	20 years	20 years
Disposal group, disposed of by sale
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Restricted cash		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Number of buildings | building		0	0	0	0	0	0
Building and building improvements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Depreciation of real estate		$ 308,000,000					$ 300,100,000	$ 287,800,000
Building and building improvements | Minimum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property depreciable lives		25 years	25 years	25 years	25 years	25 years
Building and building improvements | Maximum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property depreciable lives		40 years	40 years	40 years	40 years	40 years
Leasehold improvements | Minimum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property depreciable lives		1 year	1 year	1 year	1 year	1 year
Leasehold improvements | Maximum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property depreciable lives		20 years	20 years	20 years	20 years	20 years
Stabilized Office Properties | Washington
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings | property		10	10	10	10	10
Stabilized Office Properties | Texas
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings | property		1	1	1	1	1
Future development project | Washington
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings | development_site		1	1	1	1	1
Future development project | Texas
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of buildings | development_site		1	1	1	1	1
Variable Interest Entity, Primary Beneficiary
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of VIEs | variableInterestEntity		3	3	3	3	3	2
Number of VIEs established in the period | variableInterestEntity	1
Assets		$ 435,500,000	$ 435,500,000	$ 435,500,000	$ 435,500,000	$ 435,500,000	$ 416,700,000
Liabilities		18,000,000	18,000,000	18,000,000	18,000,000	18,000,000	23,600,000
Variable Interest Entity, Primary Beneficiary | 100 First LLC and 303 Second LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling interest in consolidated subsidiary		169,400,000	169,400,000	169,400,000	169,400,000	169,400,000	173,700,000
Variable Interest Entity, Primary Beneficiary | Real estate investment
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Assets		$ 357,300,000	$ 357,300,000	$ 357,300,000	$ 357,300,000	$ 357,300,000	$ 350,000,000

Acquisitions - Operating Proper

Acquisitions - Operating Property Acquisitions (Details) $ in Thousands		12 Months Ended
	Sep. 27, 2024 USD ($) ft² property	Dec. 31, 2023 property	Dec. 31, 2024 ft²
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Number of Buildings | property		0
Rentable square feet | ft²			17,142,721
Acquisition related costs	$ 200
Deferred leasing costs and acquisition-related intangible assets	13,534
Below-market leases acquired	$ 300
Weighted average amortization of below market leases (in years)	4 years 10 months 24 days
In-Place Leases
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Deferred leasing costs and acquisition-related intangible assets	$ 10,500
Weighted average amortization period of above-market leases (in years)	4 years 8 months 12 days
Leasing Commissions
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Deferred leasing costs and acquisition-related intangible assets	$ 2,000
Weighted average amortization period of above-market leases (in years)	4 years 10 months 24 days
Above Market Leases
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Deferred leasing costs and acquisition-related intangible assets	$ 1,000
Weighted average amortization period of above-market leases (in years)	4 years 7 months 6 days
12707 & 12777 High Bluff Drive (Junction at Del Mar)
Schedule of Asset Acquisitions, by Acquisition [Line Items]
Number of Buildings | property	2
Rentable square feet | ft²	103,731
Purchase price	$ 35,000

Acquisitions - Assets Acquired

Acquisitions - Assets Acquired and Liabilities Assumed (Details) $ in Thousands	Sep. 27, 2024 USD ($)
Assets
Land and improvements	$ 6,000
Buildings and improvements	15,703
Deferred leasing costs and acquisition-related intangible assets	13,534
Prepaid expenses and other assets, net	30
Total assets acquired	35,267
Liabilities
Acquisition-related intangible liabilities	267
Total liabilities assumed	267
Net assets and liabilities acquired	$ 35,000

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisition costs, capitalized	$ 0.2	$ 0

Dispositions - Operating Proper

Dispositions - Operating Property Dispositions (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2022 USD ($) ft² building	Dec. 31, 2024 USD ($) ft² building	Dec. 31, 2023 USD ($) building	Dec. 31, 2022 USD ($) ft² building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable square feet | ft²		17,142,721
Gains on sales of operating properties | $		$ 0	$ 0	$ 17,329
Disposal group, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | building		0	0
Disposal group, disposed of by sale | 2022 Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | building				1
Rentable square feet | ft²				96,085
Sales price | $				$ 48,000
Disposal group, disposed of by sale | 3130 Wilshire Boulevard, Santa Monica, CA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | building	1
Rentable square feet | ft²	96,085
Sales price | $	$ 48,000

Marketable Securities (Details)

Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Deferred compensation plan assets	$ 27,965	$ 28,089
Certificates of deposit	0	256,581
Total marketable securities	$ 27,965	$ 284,670

Receivables - Current Receivabl

Receivables - Current Receivables and Deferred Rent Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current Receivables, net
Current receivables	$ 11,347	$ 15,176
Allowance for uncollectible tenant receivables	(314)	(1,567)
Current receivables, net	11,033	13,609
Deferred Rent Receivables, net
Deferred rent receivables	451,996	461,707
Allowance for deferred rent receivables	0	(728)
Deferred rent receivables, net	$ 451,996	$ 460,979

Deferred Leasing Costs and Ac_3

Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net - Deferred Leasing Costs and Acquisition-related Intangible Assets and Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred Leasing Costs and Acquisition-related Intangible Assets, net (1):
Total deferred leasing costs and acquisition-related intangible assets, net	$ 225,937	$ 229,705
Acquisition-related Intangible Liabilities, net:
Below-market operating leases	38,413	39,159
Accumulated amortization	(10,995)	(8,402)
Acquisition-related intangible liabilities, net	27,418	30,757
Total acquisition-related intangible liabilities, net	27,418	30,757
Deferred Leasing Costs
Deferred Leasing Costs and Acquisition-related Intangible Assets, net (1):
Finite-lived intangible assets, gross	303,541	297,871
Accumulated amortization	(136,171)	(122,680)
Finite-lived intangible assets, net	167,370	175,191
Above-market operating leases
Deferred Leasing Costs and Acquisition-related Intangible Assets, net (1):
Finite-lived intangible assets, gross	1,269	260
Accumulated amortization	(156)	(70)
Finite-lived intangible assets, net	1,113	190
In-Place Leases
Deferred Leasing Costs and Acquisition-related Intangible Assets, net (1):
Finite-lived intangible assets, gross	78,979	70,247
Accumulated amortization	(21,525)	(15,923)
Finite-lived intangible assets, net	$ 57,454	$ 54,324

Deferred Leasing Costs and Ac_4

Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net - Amortization of Deferred Leasing Costs and Acquisition-related Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	$ 38,067	$ 41,001	$ 52,229
Estimated annual amortization related to acquisition-related intangible liabilities
Below-market operating leases, 2025	(3,627)
Below-market operating leases, 2026	(3,533)
Below-market operating leases, 2027	(3,144)
Below-market operating leases, 2028	(2,962)
Below-market operating leases, 2029	(2,727)
Below-market operating leases, thereafter	(11,425)
Below-market operating leases	(27,418)	(30,757)
Deferred Leasing Costs
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	34,135	31,771	31,059
Estimated annual amortization related to acquisition-related intangible assets
Finite-lived intangible assets, 2025	30,699
Finite-lived intangible assets, 2026	26,910
Finite-lived intangible assets, 2027	23,610
Finite-lived intangible assets, 2028	21,514
Finite-lived intangible assets, 2029	18,855
Finite-lived intangible assets, thereafter	45,782
Finite-lived intangible assets, net	167,370	175,191
Above-market operating leases
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	86	31	31
Estimated annual amortization related to acquisition-related intangible assets
Finite-lived intangible assets, 2025	251
Finite-lived intangible assets, 2026	251
Finite-lived intangible assets, 2027	251
Finite-lived intangible assets, 2028	251
Finite-lived intangible assets, 2029	105
Finite-lived intangible assets, thereafter	4
Finite-lived intangible assets, net	1,113	190
In-Place Leases
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	7,453	15,878	31,647
Estimated annual amortization related to acquisition-related intangible assets
Finite-lived intangible assets, 2025	9,057
Finite-lived intangible assets, 2026	8,528
Finite-lived intangible assets, 2027	6,976
Finite-lived intangible assets, 2028	6,912
Finite-lived intangible assets, 2029	5,884
Finite-lived intangible assets, thereafter	20,097
Finite-lived intangible assets, net	57,454	54,324
Below-market operating leases
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization of intangible liabilities	$ (3,607)	$ (6,679)	$ (10,508)

Prepaid Expenses and Other As_3

Prepaid Expenses and Other Assets, Net - Schedule of Prepaid Expenses and Other Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Furniture, fixtures and other long-lived assets, net	$ 26,316	$ 37,073
Prepaid expenses and deferred financing costs, net (1)	21,162	10,532
Other assets	4,457	5,464
Total prepaid expenses and other assets, net	51,935	53,069
Proceeds from sale of corporate aircraft	19,800
Gain on disposition of sale	$ 5,979	$ 0	$ 0

Secured and Unsecured Debt of_4

Secured and Unsecured Debt of the Company (Details) $ in Thousands	Dec. 31, 2024 USD ($) debt_covenant	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Total secured debt	$ 598,199	$ 603,225
Number of debt covenants impacting payment of dividends during event of default | debt_covenant	1
Unsecured debt
Debt Instrument [Line Items]
Long-term debt	$ 4,000,000	$ 4,300,000

Secured and Unsecured Debt of_5

Secured and Unsecured Debt of the Operating Partnership - Secured Debt and Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Secured Debt
Total secured debt	$ 598,199	$ 603,225
Kilroy Realty L.P.
Secured Debt
Long-term debt, gross	4,631,688
Total secured debt	598,199	603,225
Kilroy Realty L.P. | 3.57% Mortgage Payable due December 2026
Secured Debt
Long-term debt, gross	152,700
Kilroy Realty L.P. | 5.90% Mortgage Payable due August 2034
Secured Debt
Long-term debt, gross	375,000
Kilroy Realty L.P. | Secured debt
Secured Debt
Total secured debt	606,688	612,694
Unamortized deferred financing costs	(8,489)	(9,469)
Total secured debt, net	$ 598,199	603,225
Kilroy Realty L.P. | Secured debt | 3.57% Mortgage Payable due December 2026
Secured Debt
Stated interest rate	3.57%
Effective interest rate	3.57%
Long-term debt, gross	$ 152,668	156,386
Kilroy Realty L.P. | Secured debt | 4.48% Mortgage Payable due July 2027
Secured Debt
Stated interest rate	4.48%
Effective interest rate	4.48%
Long-term debt, gross	$ 79,020	81,308
Kilroy Realty L.P. | Secured debt | 5.90% Mortgage Payable due August 2034
Secured Debt
Stated interest rate	5.90%
Effective interest rate	5.90%
Long-term debt, gross	$ 375,000	$ 375,000

Secured and Unsecured Debt of_6

Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes - Registered Offerings and Private Placement (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 31, 2024
Debt Instrument [Line Items]
Principal amount of debt	$ 425,000,000	$ 425,000,000
Repurchases of unsecured debt		0	$ 20,584,000	$ 0
Repayments of unsecured debt	403,700,000	723,712,000	0	0
Kilroy Realty L.P.
Debt Instrument [Line Items]
Repurchases of unsecured debt		0	20,584,000	0
Repayments of unsecured debt		723,712,000	0	$ 0
Long-term debt, gross	4,631,688,000	4,631,688,000
Kilroy Realty L.P. | Secured debt
Debt Instrument [Line Items]
Net book value of properties pledged as collateral for secured debt	795,300,000	795,300,000
Kilroy Realty L.P. | Unsecured debt | 3.450% Unsecured Senior Notes Due 2024
Debt Instrument [Line Items]
Principal amount of debt			425,000,000
Repurchases of unsecured debt			$ 21,300,000
Stated interest rate			3.45%
Long-term debt, gross	$ 0	$ 0	$ 403,712,000
Stated coupon rate			3.45%
Kilroy Realty L.P. | Unsecured debt | 6.250% Unsecured Senior Notes
Debt Instrument [Line Items]
Principal amount of debt					$ 400,000,000
Stated interest rate	6.25%	6.25%			6.25%
Long-term debt, gross	$ 400,000,000	$ 400,000,000	$ 0		$ 400,000,000
Unamortized discount (premium), net					$ 4,500,000
Stated coupon rate	6.25%	6.25%			6.25%

Secured and Unsecured Debt of_7

Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes (Details) - USD ($)	Dec. 31, 2024	Jan. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total Unsecured Senior Notes, Net	$ 3,999,566,000		$ 4,325,153,000
Unsecured debt | Unsecured Senior Notes
Debt Instrument [Line Items]
Unamortized discount (premium), net	8,400,000		5,300,000
Unamortized debt issuance expense	15,800,000		15,900,000
Kilroy Realty L.P.
Debt Instrument [Line Items]
Long-term debt, gross	4,631,688,000
Total Unsecured Senior Notes, Net	3,999,566,000		4,325,153,000
Kilroy Realty L.P. | Unsecured debt
Debt Instrument [Line Items]
Total Unsecured Senior Notes, Net	$ 3,800,795,000		3,807,495,000
Kilroy Realty L.P. | Unsecured debt | 4.300% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	4.30%
Effective interest rate	4.30%
Long-term debt, gross	$ 50,000,000		50,000,000
Unamortized discount and deferred financing costs	(69,000)		(113,000)
Total Unsecured Senior Notes, Net	$ 49,931,000		49,887,000
Kilroy Realty L.P. | Unsecured debt | 4.350% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	4.35%
Effective interest rate	4.35%
Long-term debt, gross	$ 200,000,000		200,000,000
Unamortized discount and deferred financing costs	(314,000)		(488,000)
Total Unsecured Senior Notes, Net	$ 199,686,000		199,512,000
Kilroy Realty L.P. | Unsecured debt | 3.350% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	3.35%
Effective interest rate	3.35%
Long-term debt, gross	$ 175,000,000		175,000,000
Unamortized discount and deferred financing costs	(247,000)		(363,000)
Total Unsecured Senior Notes, Net	$ 174,753,000		174,637,000
Kilroy Realty L.P. | Unsecured debt | 3.450% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	3.45%
Effective interest rate	3.45%
Long-term debt, gross	$ 75,000,000		75,000,000
Unamortized discount and deferred financing costs	(176,000)		(219,000)
Total Unsecured Senior Notes, Net	$ 74,824,000		74,781,000
Kilroy Realty L.P. | Unsecured debt | 4.270% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	4.27%
Effective interest rate	4.27%
Long-term debt, gross	$ 350,000,000		350,000,000
Unamortized discount and deferred financing costs	(1,101,000)		(1,282,000)
Total Unsecured Senior Notes, Net	$ 348,899,000		$ 348,718,000
Kilroy Realty L.P. | Unsecured debt | 3.450% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate			3.45%
Effective interest rate	3.47%
Long-term debt, gross	$ 0		$ 403,712,000
Unamortized discount and deferred financing costs	0		(558,000)
Total Unsecured Senior Notes, Net	$ 0		403,154,000
Kilroy Realty L.P. | Unsecured debt | 4.375% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	4.375%
Effective interest rate	4.444%
Long-term debt, gross	$ 400,000,000		400,000,000
Unamortized discount and deferred financing costs	(415,000)		(969,000)
Total Unsecured Senior Notes, Net	$ 399,585,000		399,031,000
Kilroy Realty L.P. | Unsecured debt | 4.750% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	4.75%
Effective interest rate	4.80%
Long-term debt, gross	$ 400,000,000		400,000,000
Unamortized discount and deferred financing costs	(1,973,000)		(2,468,000)
Total Unsecured Senior Notes, Net	$ 398,027,000		397,532,000
Kilroy Realty L.P. | Unsecured debt | 4.250% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	4.25%
Effective interest rate	4.35%
Long-term debt, gross	$ 400,000,000		400,000,000
Unamortized discount and deferred financing costs	(2,439,000)		(2,971,000)
Total Unsecured Senior Notes, Net	$ 397,561,000		397,029,000
Kilroy Realty L.P. | Unsecured debt | 3.050% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	3.05%
Effective interest rate	3.064%
Long-term debt, gross	$ 500,000,000		500,000,000
Unamortized discount and deferred financing costs	(3,036,000)		(3,629,000)
Total Unsecured Senior Notes, Net	$ 496,964,000		496,371,000
Kilroy Realty L.P. | Unsecured debt | 2.500% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	2.50%
Effective interest rate	2.56%
Long-term debt, gross	$ 425,000,000		425,000,000
Unamortized discount and deferred financing costs	(4,201,000)		(4,735,000)
Total Unsecured Senior Notes, Net	$ 420,799,000		420,265,000
Kilroy Realty L.P. | Unsecured debt | 2.650% Unsecured Senior Notes
Debt Instrument [Line Items]
Stated coupon rate	2.65%
Effective interest rate	2.654%
Long-term debt, gross	$ 450,000,000		450,000,000
Unamortized discount and deferred financing costs	(3,075,000)		(3,422,000)
Total Unsecured Senior Notes, Net	$ 446,925,000		446,578,000
Kilroy Realty L.P. | Unsecured debt | 6.250% Unsecured Senior Notes
Debt Instrument [Line Items]
Unamortized discount (premium), net		$ 4,500,000
Stated coupon rate	6.25%	6.25%
Effective interest rate	6.385%
Long-term debt, gross	$ 400,000,000	$ 400,000,000	0
Unamortized discount and deferred financing costs	(7,159,000)		0
Total Unsecured Senior Notes, Net	$ 392,841,000		$ 0

Secured and Unsecured Debt of_8

Secured and Unsecured Debt of the Operating Partnership - Unsecured Revolving Credit Facility and Term Loan Facility (Details) - USD ($)	1 Months Ended			12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Repayments of unsecured debt	$ 403,700,000			$ 723,712,000	$ 0	$ 0
Principal amount of debt	425,000,000			425,000,000
Kilroy Realty L.P.
Debt Instrument [Line Items]
Repayments of unsecured debt				723,712,000	0	$ 0
Revolving credit facility | Kilroy Realty L.P.
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	1,100,000,000			1,100,000,000	1,100,000,000
Remaining borrowing capacity	$ 1,100,000,000			$ 1,100,000,000	$ 1,100,000,000
Revolving credit facility | Kilroy Realty L.P. | 2022 Term Loan Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 1,100,000,000
Term Loan Facility | Kilroy Realty L.P. | 2022 Term Loan Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			520,000,000
Repayments of unsecured debt		$ 120,000,000	200,000,000
Term Loan Facility | Kilroy Realty L.P. | Unsecured New Term Loan Facility
Debt Instrument [Line Items]
Principal amount of debt			200,000,000
Remaining borrowing capacity			$ 320,000,000
Maturity period			12 months

Secured and Unsecured Debt of_9

Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes, Unsecured Revolving Credit Facility and Term Loan Facility (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) extension_option	Dec. 31, 2023 USD ($) extension_option	Mar. 31, 2024 USD ($)
Terms of the Credit Facility
Outstanding letters of credit		$ 5,200,000
Number of extension options | extension_option		2
Kilroy Realty L.P. | Revolving credit facility
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	5.69%	6.38%
Facility fee-annual rate (percent)	0.25%	0.20%
Outstanding letters of credit	$ 5,200,000
Contingent additional borrowings	$ 500,000,000	$ 500,000,000
Debt instrument, reduction interest rate	0.01%	0.01%
Unamortized debt issuance expense	$ 12,700,000	$ 3,200,000
Extension period (in months)	6 months	6 months
Kilroy Realty L.P. | Revolving credit facility | Secured Overnight Financing Rate (SOFR)
Terms of the Credit Facility
Basis spread on SOFR and LIBOR	1.10%	0.90%
Kilroy Realty L.P. | Revolving credit facility | 2022 Term Loan Facility
Terms of the Credit Facility
Total borrowing capacity			$ 1,100,000,000
Kilroy Realty L.P. | Term loan facility | 2024 Term Loan Facility
Terms of the Credit Facility
Outstanding borrowings	$ 200,000,000
Remaining borrowing capacity	0
Total borrowing capacity	$ 200,000,000
Interest rate	5.70%
Contingent additional borrowings	$ 130,000,000
Unamortized debt issuance expense	$ 1,200,000
Kilroy Realty L.P. | Term loan facility | 2024 Term Loan Facility | Secured Overnight Financing Rate (SOFR)
Terms of the Credit Facility
Basis spread on SOFR and LIBOR	1.20%
Kilroy Realty L.P. | Term loan facility | 2022 Term Loan Facility
Terms of the Credit Facility
Outstanding borrowings		$ 520,000,000
Remaining borrowing capacity		0
Total borrowing capacity		$ 520,000,000
Interest rate		6.41%
Undrawn facility fee-annual rate		0.20%
Unamortized debt issuance expense		$ 2,300,000
Kilroy Realty L.P. | Term loan facility | 2022 Term Loan Facility | Secured Overnight Financing Rate (SOFR)
Terms of the Credit Facility
Basis spread on SOFR and LIBOR		0.95%
Kilroy Realty L.P. | Unsecured debt | 2024 Term Loan Facility
Terms of the Credit Facility
Number of extension options | extension_option	2
Extension period (in months)	12 months
Kilroy Realty L.P. | Revolving Credit Facility and Term Loan Facility | Adjusted SOFR
Terms of the Credit Facility
Basis spread on SOFR and LIBOR	0.10%	0.10%

Secured and Unsecured Debt o_10

Secured and Unsecured Debt of the Operating Partnership - Debt Covenants and Restrictions (Details)	Dec. 31, 2024 debt_covenant
Kilroy Realty L.P.
Debt Instrument [Line Items]
Number of noncompliant debt covenants that could require immediate repayment of full principal balance of associated debt	1

Secured and Unsecured Debt o_11

Secured and Unsecured Debt of the Operating Partnership - Debt Maturities (Details) - Kilroy Realty L.P. $ in Thousands	Dec. 31, 2024 USD ($)
Stated debt maturities and scheduled amortization payments, excluding debt discounts
2025	$ 606,246
2026	401,317
2027	249,125
2028	400,000
2029	475,000
Thereafter	2,500,000
Total aggregate principal value	4,631,688
Unsecured Term Loan Facility
Stated debt maturities and scheduled amortization payments, excluding debt discounts
Unamortized debt issuance expense	25,500
Unsecured Senior Notes
Stated debt maturities and scheduled amortization payments, excluding debt discounts
Unamortized discount	$ 8,400

Secured and Unsecured Debt o_12

Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest and Loan Fees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Capitalized Interest and Loan Fees [Line Items]
Interest expense	$ 145,287	$ 114,216	$ 84,278
Kilroy Realty L.P.
Capitalized Interest and Loan Fees [Line Items]
Gross interest expense	227,748	192,983	161,761
Capitalized interest	(82,461)	(78,767)	(77,483)
Interest expense	$ 145,287	$ 114,216	$ 84,278

Deferred Revenue and Acquisit_3

Deferred Revenue and Acquisition-Related Intangible Liabilities, net - Deferred Revenue and Acquisition-Related Intangible Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Deferred revenue related to tenant-funded tenant improvements	$ 81,738	$ 97,802
Other deferred revenue	33,281	45,079
Acquisition-related intangible liabilities, net	27,418	30,757
Deferred revenue and acquisition-related intangible liabilities, net	$ 142,437	$ 173,638

Deferred Revenue and Acquisit_4

Deferred Revenue and Acquisition-Related Intangible Liabilities, net - Estimated Amortization of Deferred Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred Revenue, Future Amortization Recognized By Year [Abstract]
Total	$ 81,738	$ 97,802
Tenant funded tenant improvements
Disaggregation of Revenue [Line Items]
Deferred revenues amortized and recognized as rental income	19,100	$ 20,700	$ 19,300
Deferred Revenue, Future Amortization Recognized By Year [Abstract]
2025	14,758
2026	12,754
2027	10,727
2028	9,821
2029	9,099
Thereafter	24,579
Total	$ 81,738

Noncontrolling Interests on t_3

Noncontrolling Interests on the Company’s Consolidated Financial Statements (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) trading_day $ / shares shares	Dec. 31, 2023 USD ($) trading_day $ / shares shares	Aug. 30, 2016 rEITSubsidiary company
Noncontrolling Interest [Line Items]
Conversion ratio	1
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	$ 46,800	$ 47,000
Noncontrolling interest in consolidated subsidiary	$ 174,351	$ 178,257
Non-Affiliated Investors and Certain Executive Officer and Directors | Common Units
Noncontrolling Interest [Line Items]
Noncontrolling common units ( in shares ) | shares	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]
Noncontrolling common units ( in shares ) | shares	1,150,574	1,150,574
Operating Partnership
Noncontrolling Interest [Line Items]
Ownership interest (percent)	99%	99%
Operating Partnership | Non-Affiliated Investors and Certain Executive Officer and Directors
Noncontrolling Interest [Line Items]
Ownership interest (percent)	1%	1%
Norges Bank Real Estate Management (NBREM) | Consolidated property partnerships
Noncontrolling Interest [Line Items]
Contributions, number of REIT subsidiaries | rEITSubsidiary			2
Ownership interest of limited partnership interests			44%
Ownership interest, number of existing companies | company			2
100 First LLC and 303 Second LLC | Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Noncontrolling interest in consolidated subsidiary	$ 169,400	$ 173,700
Redwood LLC
Noncontrolling Interest [Line Items]
Noncontrolling interest in consolidated subsidiary	$ 4,900	$ 4,600

Noncontrolling Interests on t_4

Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements (Details) - Consolidated property partnerships - Norges Bank Real Estate Management (NBREM)	Aug. 30, 2016 rEITSubsidiary company
Noncontrolling Interest [Line Items]
Contributions, number of REIT subsidiaries | rEITSubsidiary	2
Ownership interest of limited partnership interests	44%
Ownership interest, number of existing companies | company	2

Stockholders' Equity of the C_3

Stockholders' Equity of the Company - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Mar. 31, 2024	Feb. 29, 2024
2024 At-The-Market Program
Class of Stock [Line Items]
At the market stock offering aggregate gross sales price of common stock		$ 500,000,000
Share Repurchase Program
Class of Stock [Line Items]
Aggregate gross purchase price			$ 500,000,000
Stock repurchase program, number of shares authorized to be repurchased (in shares)	4,935,826
Stock repurchased during period (in shares)	0

Stockholders' Equity of the C_4

Stockholders' Equity of the Company - At-The-Market Offering and Derivatives and Distributions (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Dividends and Distributions payable to:
Accrued distributions (Note 15)	$ 64,850	$ 64,440
Outstanding Shares and Units:
Common stock (in shares)	118,046,674	117,239,558
Restricted Stock Units (RSUs)
Outstanding Shares and Units:
RSUs (in shares)	861,385	908,336
Kilroy Realty L.P.
Dividends and Distributions payable to:
Accrued distributions (Note 15)	$ 64,850	$ 64,440
Kilroy Realty L.P. | Restricted Stock Units (RSUs)
Dividends and Distributions payable to:
Accrued distributions (Note 15)	$ 484	$ 510
Kilroy Realty L.P. | Market measure-based Restricted Stock Units (RSUs)
Outstanding Shares and Units:
Number of RSUs outstanding (in shares)	828,442	1,083,086
Kilroy Realty L.P. | Common Units
Outstanding Shares and Units:
Noncontrolling common units ( in shares )	1,150,574	1,150,574
Noncontrolling common units | Common Units
Outstanding Shares and Units:
Noncontrolling common units ( in shares )	1,150,574	1,150,574
Common stockholders and noncontrolling unitholders
Dividends and Distributions payable to:
Accrued distributions (Note 15)	$ 64,850	$ 64,440
Common stockholders
Dividends and Distributions payable to:
Accrued distributions (Note 15)	$ 63,745	$ 63,309
Outstanding Shares and Units:
Common stock (in shares)	118,046,674	117,239,558
Common Units
Dividends and Distributions payable to:
Accrued distributions (Note 15)	$ 621	$ 621

Partners' Capital of the Oper_3

Partners' Capital of the Operating Partnership - At-The-Market Stock Offering, Common Units and Accrued Distributions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Accrued distributions
Accrued distributions (Note 15)	$ 64,850	$ 64,440
Operating Partnership
General Partners' Capital Account
Ownership interest (percent)	99%	99%
Kilroy Realty L.P.
Accrued distributions
Accrued distributions (Note 15)	$ 64,850	$ 64,440
Kilroy Realty L.P. | Restricted Stock Units (RSUs)
Accrued distributions
Accrued distributions (Note 15)	$ 484	$ 510
RSUs (in shares)	861,385	908,336
Kilroy Realty L.P. | Market measure-based Restricted Stock Units (RSUs)
Accrued distributions
Number of RSUs outstanding (in shares)	828,442	1,083,086
Kilroy Realty L.P. | Partners’ Capital
Accrued distributions
Accrued distributions (Note 15)	$ 64,850	$ 64,440
Kilroy Realty L.P. | Partners capital general partner
Accrued distributions
Accrued distributions (Note 15)	63,745	63,309
Kilroy Realty L.P. | Partners capital limited partner
Accrued distributions
Accrued distributions (Note 15)	$ 621	$ 621
Non-Affiliated Investors | Operating Partnership
General Partners' Capital Account
Ownership interest (percent)	1%	1%
Common Units | Kilroy Realty L.P.
General Partners' Capital Account
Company owned common units in the Operating Partnership (in shares)	118,046,674	117,239,558
Non-affiliated investors and other common units of the Operating Partnership (in shares)	1,150,574	1,150,574
Common Units | Non-Affiliated Investors
General Partners' Capital Account
Non-affiliated investors and other common units of the Operating Partnership (in shares)	1,150,574	1,150,574

Share-Based and Other Compens_3

Share-Based and Other Compensation - Stockholder Approved Share-Based Incentive Compensation Plan (Details) shares in Millions	Dec. 31, 2024 compensation_plan shares
Share-Based Payment Arrangement [Abstract]
Number of share-based incentive compensation plans | compensation_plan	1
Effective registration shares (in shares)	12.6
Number of shares available for grant (in shares)	2.6

Share-Based and Other Compens_4

Share-Based and Other Compensation - (Details) - USD ($) $ in Millions			12 Months Ended
	Aug. 19, 2024	Jan. 22, 2024	Dec. 31, 2023
Chief Executive Officer and Former President
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense related to accelerated			$ 27.3
Chief Executive Officer | RSUs granted | Kilroy Realty 2006 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)		101,627
Vesting period		1 year
Executive Vice President and Chief Financial Officer | RSUs granted | Jeffrey Kuehling 2006 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)	20,373
Vesting period	1 year 4 months 24 days

Share-Based and Other Compens_5

Share-Based and Other Compensation - Annual Performance-Based RSU Grants (Details) $ / shares in Units, $ in Millions				12 Months Ended
	Feb. 01, 2024 USD ($) $ / shares shares	Feb. 06, 2023 USD ($) $ / shares shares	Jan. 28, 2022 USD ($) $ / shares shares	Dec. 31, 2024 participant	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of publicly-traded options on shares of Company stock				6 months
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years	3 years	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%
Number of shares issuable per RSU				1
2024 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSUs achievement target, participant one, percent				175%
Number of participants with compensation expense recognized on a rolling twelve-month basis | participant				1
Performance-based RSUs achievement target, all other participants, percent				150%
Fair value on valuation date | $	$ 9.5
Fair value per share on valuation date ( in dollars per share) | $ / shares	$ 36
Expected share price volatility	34%
Risk-free interest rate	3.98%
2024 Performance-Based RSUs | One Participant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share on valuation date ( in dollars per share) | $ / shares	$ 36.43
2024 Performance-Based RSUs | Executive officer share-based compensation programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target RSUs granted (in shares) | shares	265,205
2024 Performance-Based RSUs | Market measure-based RSUs earned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated RSUs earned (in shares) | shares	416,451
2023 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSUs achievement target, all other participants, percent				150%
Fair value on valuation date | $		$ 12
Fair value per share on valuation date ( in dollars per share) | $ / shares		$ 40.10
Expected share price volatility		35%
Risk-free interest rate		4.12%
2023 Performance-Based RSUs | One Participant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share on valuation date ( in dollars per share) | $ / shares		$ 40.43
2023 Performance-Based RSUs | Executive officer share-based compensation programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target RSUs granted (in shares) | shares		300,007
2023 Performance-Based RSUs | Market measure-based RSUs earned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated RSUs earned (in shares) | shares		705,267
2022 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSUs achievement target, participant one, percent				183.75%
Fair value on valuation date | $			$ 12.7
Fair value per share on valuation date ( in dollars per share) | $ / shares			$ 67.62
Expected share price volatility			36%
Risk-free interest rate			1.35%
2022 Performance-Based RSUs | One Participant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share on valuation date ( in dollars per share) | $ / shares			$ 70
2022 Performance-Based RSUs | Executive officer share-based compensation programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target RSUs granted (in shares) | shares			193,111
2022 Performance-Based RSUs | Market measure-based RSUs earned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated RSUs earned (in shares) | shares			396,736

Share-Based and Other Compens_6

Share-Based and Other Compensation - Summary of Performance and Market-Measure Based RSUs (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)	0
Market measure-based Restricted Stock Units (RSUs)
Weighted-Average Fair Value Per Share
Outstanding beginning balance ( in dollars per share)	$ 52.47
Granted ( in dollars per share)	35.67
Vested (in dollars per share)	53.39
Settled (in dollars per share)	0
Issuance of dividend equivalents ( in dollars per share)	34.67
Canceled (in dollars per share)	38.64
Outstanding ending balance (in dollars per share)	$ 42.49	$ 52.47
Nonvested Restricted Stock Units RSU | Market measure-based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of RSUs outstanding, beginning balance (in shares)	1,083,086
Granted (in shares)	416,451	483,113	310,484
Vested (in shares)	702,187
Issuance of dividend equivalents (in shares)	48,673
Canceled (in shares)	(17,581)
Number of RSUs outstanding, ending balance (in shares)	828,442	1,083,086
Weighted-Average Fair Value Per Share
Granted ( in dollars per share)	$ 35.67	$ 39.65	$ 63.05
Vested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested (in shares)	1,089,879	290,570	241,184
Vested Restricted Stock Units RSU | Market measure-based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested RSUs, beginning balance (in shares)	23,583
Granted (in shares)	354,542
Vested (in shares)	702,187
Settled (in shares)	(1,032,183)
Issuance of dividend equivalents (in shares)	33,150
Canceled (in shares)	(5)
Vested RSUs, ending balance (in shares)	81,274	23,583
Restricted Stock Units (RSUs)
Weighted-Average Fair Value Per Share
Vesting period	3 years
Restricted Stock Units (RSUs) | Market measure-based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total RSUs, beginning balance (in shares)	1,106,669
Granted (in shares)	770,993
Vested (in shares)	0
Settled (in shares)	(1,032,183)
Issuance of dividend equivalents (in shares)	81,823
Canceled (in shares)	(17,586)
Total RSUs, ending balance (in shares)	909,716	1,106,669
Restricted Stock Units (RSUs) | Market measure-based Restricted Stock Units (RSUs) | Kilroy Realty 2006 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)	(517,475)

Share-Based and Other Compens_7

Share-Based and Other Compensation - Market-Measure Based RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	(1,089,879)	(290,570)	(241,184)
Market measure-based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share on valuation date ( in dollars per share)	$ 35.67
Market measure-based Restricted Stock Units (RSUs) | Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	416,451	483,113	310,484
Fair value per share on valuation date ( in dollars per share)	$ 35.67	$ 39.65	$ 63.05
Vested (in shares)	(702,187)
Market measure-based Restricted Stock Units (RSUs) | Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	354,542
Vested (in shares)	(702,187)
Total Fair Value at Vest Date	$ 38,364	$ 11,105	$ 15,200

Share-Based and Other Compens_8

Share-Based and Other Compensation - Annual Time-Based RSU Grants (Details) $ / shares in Units, $ in Millions				12 Months Ended
	Feb. 01, 2024 USD ($) $ / shares shares	Feb. 06, 2023 USD ($) $ / shares shares	Jan. 28, 2022 USD ($) $ / shares shares	Dec. 31, 2024 installment shares
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Number of installments | installment				3
Right to receive number of shares (in shares)				1
RSUs granted | Executive officer share-based compensation programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	236,389	217,059	158,170
Fair value on valuation date | $	$ 8.3	$ 8.6	$ 10
Weighted average fair value per share (in dollars per share) | $ / shares	$ 35.20	$ 39.65	$ 63.05

Share-Based and Other Compens_9

Share-Based and Other Compensation - Summary of Time-Based RSUs (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)	0
Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested (in shares)	(1,089,879)	(290,570)	(241,184)
RSUs granted | Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of RSUs outstanding, beginning balance (in shares)	401,310
Granted (in shares)	385,718
Vested (in shares)	(250,952)
Settled (in shares)	0
Issuance of dividend equivalents (in shares)	28,519
Forfeited (in shares)	(27,169)
Canceled (in shares)	0
Number of RSUs outstanding, ending balance (in shares)	537,426	401,310
Weighted Average Fair Value Per Share
Outstanding beginning balance ( in dollars per share)	$ 43.86
Granted ( in dollars per share)	36.12
Vested (in dollars per share)	47.15
Settled (in dollars per share)	0
Issuance of dividend equivalents ( in dollars per share)	32.97
Forfeited (in dollars per share)	40.42
Canceled (in dollars per share)	0
Outstanding ending balance (in dollars per share)	$ 36.37	$ 43.86
RSUs granted | Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested RSUs, beginning balance (in shares)	483,443
Granted (in shares)	0
Vested (in shares)	(250,952)
Settled (in shares)	(516,154)
Issuance of dividend equivalents (in shares)	30,216
Forfeited (in shares)	0
Canceled (in shares)	(5,772)
Vested RSUs, ending balance (in shares)	242,685	483,443
RSUs granted | Vested RSUs | Kilroy Realty 2006 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)	(229,447)
RSUs granted | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total RSUs, beginning balance (in shares)	884,753
Granted (in shares)	385,718
Vested (in shares)	0
Settled (in shares)	(516,154)
Issuance of dividend equivalents (in shares)	58,735
Forfeited (in shares)	(27,169)
Canceled (in shares)	(5,772)
Total RSUs, ending balance (in shares)	780,111	884,753
Market measure-based Restricted Stock Units (RSUs)
Weighted Average Fair Value Per Share
Outstanding beginning balance ( in dollars per share)	$ 52.47
Granted ( in dollars per share)	35.67
Vested (in dollars per share)	53.39
Settled (in dollars per share)	0
Issuance of dividend equivalents ( in dollars per share)	34.67
Forfeited (in dollars per share)	38.64
Outstanding ending balance (in dollars per share)	$ 42.49	$ 52.47
Market measure-based Restricted Stock Units (RSUs) | Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of RSUs outstanding, beginning balance (in shares)	1,083,086
Granted (in shares)	416,451	483,113	310,484
Vested (in shares)	(702,187)
Issuance of dividend equivalents (in shares)	48,673
Forfeited (in shares)	(17,581)
Number of RSUs outstanding, ending balance (in shares)	828,442	1,083,086
Weighted Average Fair Value Per Share
Granted ( in dollars per share)	$ 35.67	$ 39.65	$ 63.05
Market measure-based Restricted Stock Units (RSUs) | Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested RSUs, beginning balance (in shares)	23,583
Granted (in shares)	354,542
Vested (in shares)	(702,187)
Settled (in shares)	(1,032,183)
Issuance of dividend equivalents (in shares)	33,150
Forfeited (in shares)	(5)
Vested RSUs, ending balance (in shares)	81,274	23,583
Market measure-based Restricted Stock Units (RSUs) | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total RSUs, beginning balance (in shares)	1,106,669
Granted (in shares)	770,993
Vested (in shares)	0
Settled (in shares)	(1,032,183)
Issuance of dividend equivalents (in shares)	81,823
Forfeited (in shares)	(17,586)
Total RSUs, ending balance (in shares)	909,716	1,106,669
Market measure-based Restricted Stock Units (RSUs) | Restricted Stock Units (RSUs) | Kilroy Realty 2006 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)	(517,475)

Share-Based and Other Compen_10

Share-Based and Other Compensation - Time-Based RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Vested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	(1,089,879)	(290,570)	(241,184)
Restricted Stock Units (RSUs) | Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	385,718	247,017	177,099
Fair value per share on valuation date ( in dollars per share)	$ 36.12	$ 38.12	$ 62.58
Restricted Stock Units (RSUs) | Vested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	(281,168)	(343,334)	(294,867)
Total Fair Value at Vest Date	$ 10,878	$ 12,425	$ 19,890

Share-Based and Other Compen_11

Share-Based and Other Compensation - Share-Based Compensation Cost Recorded During the Period and Other Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 24.4	$ 43.7	$ 34.8
Share-based compensation expense capitalized	6.8	6.9	$ 6.4
Share-based compensation not yet recognized	$ 23.4
Share-based compensation not yet recognized period of recognition	1 year 8 months 12 days
Severance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 27.3

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Eligibility period for 401K savings plan, period	3 months
401(k) plan, maximum participant deferral percent	60%
401(k) plan, employer match per dollar of participant contribution	$ 0.50
401(k) plan, maximum employer match percentage	10%
401(k) plan, contributions made	$ 1,800,000	$ 1,700,000	$ 1,600,000
Deferred Compensation, maximum participant deferral percent	70%
Deferred Compensation, maximum director fees and bonuses that may be deferred (percent)	100%
Deferred Compensation, mandatory Company contributions as percentage of gross monthly salary (percent)	10%
Deferred Compensation, liability under plan	$ 27,400,000	$ 25,000,000

Rental Income and Future Mini_3

Rental Income and Future Minimum Rent - Rental income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Fixed lease payments	$ 923,029	$ 944,618
Variable lease payments	197,502	184,672
Net collectability reversals	(2,416)	(11,553)
Total rental income	$ 1,118,115	$ 1,117,737	$ 1,086,018

Rental Income and Future Mini_4

Rental Income and Future Minimum Rent - Future Contractual Minimum Rent (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Future contractual minimum rent under operating lease
2025	$ 819,139
2026	787,062
2027	742,917
2028	703,798
2029	614,718
Thereafter	1,608,063
Total	$ 5,275,697

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) groundLease	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Long-term Purchase Commitment [Line Items]
Commitments for contracts and executed leases, operating and redevelopment and development properties	$ 170.9
Weighted average discount rate, ground leases	4.67%
Weighted average remaining lease term	62 years
Variable lease, cost	$ 4.7	$ 4	$ 3.6
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	consolidated balance sheets	consolidated balance sheets
Environmental matters
Long-term Purchase Commitment [Line Items]
Accrued environmental remediation liabilities	$ 72	$ 76.6
Ten year ground lease extension option
Long-term Purchase Commitment [Line Items]
Number of extension options | groundLease	3
Ground lease extension option term	10 years
Forty-five year ground lease extension option
Long-term Purchase Commitment [Line Items]
Number of extension options | groundLease	1
Ground lease extension option term	45 years

Commitments and Contingencies_2

Commitments and Contingencies - Minimum Commitment Under Ground Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Minimum commitment under our ground leases
2025	$ 6,772
2026	6,809
2027	6,850
2028	6,869
2029	6,869
Thereafter	367,744
Total undiscounted cash flows	401,913
Present value discount	(273,491)
Ground lease liabilities	$ 128,422	$ 124,353
Period after which ground lease rentals are adjusted based on fair market value and the Consumer Price Index	5 years
Duration of ground lease increase	10 years
Average annual percentage rent for previous ten years (percent)	60%
Previous period included in average annual rent percentage for ten-year increases	3 years
Ground lease fixed ground rent increase, percent	5%
Percentage rent increase every year	2%
Ground lease reset period	10 years
Remaining ground lease obligation period	10 years

Fair Value Measurements and D_3

Fair Value Measurements and Disclosures - Assets and Liabilities Reported at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair value, measurements, recurring | Fair Value (Level 1)
Assets and Liabilities Reported at Fair Value
Deferred compensation plan assets	$ 27,965	$ 28,089

Fair Value Measurements and D_4

Fair Value Measurements and Disclosures - Financial Instruments Disclosed at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Carrying Value | Secured debt, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	$ 598,199	$ 603,225
Carrying Value | Unsecured debt, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	3,999,566	4,325,153
Carrying Value | Certificates of Deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value	0	256,581
Fair value | Secured debt, net | Fair value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	569,061	585,826
Fair value | Unsecured debt, net | Fair value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt, net	3,681,914	3,927,104
Fair value | Certificates of Deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value	$ 0	$ 256,581

Net Income Available to Commo_5

Net Income Available to Common Stockholders Per Share of the Company - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net income available to common stockholders	$ 210,969	$ 212,241	$ 232,615
Allocation to participating securities	(1,967)	(1,233)	(1,272)
Numerator for basic and diluted net income available to common stockholders	$ 209,002	$ 211,008	$ 231,343
Denominator:
Basic weighted average vested shares outstanding (in shares)	117,649,111	117,160,173	116,806,575
Effect of dilutive securities (in shares)	507,876	346,082	413,472
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares)	118,156,987	117,506,255	117,220,047
Basic earnings per share:
Net income available to common stockholders per share - basic ( in dollars per share)	$ 1.78	$ 1.80	$ 1.98
Diluted earnings per share:
Net income available to common stockholders per share - diluted (in dollars per share)	$ 1.77	$ 1.80	$ 1.97

Net Income Available to Commo_6

Net Income Available to Common Unitholders Per Unit of the Operating Partnership - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net income available to common unitholders	$ 210,969	$ 212,241	$ 232,615
Allocation to participating securities	(1,967)	(1,233)	(1,272)
Numerator for basic and diluted net income available to common unitholders	$ 209,002	$ 211,008	$ 231,343
Denominator:
Basic weighted average vested units outstanding (in shares)	117,649,111	117,160,173	116,806,575
Effect of dilutive securities (in shares)	507,876	346,082	413,472
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares)	118,156,987	117,506,255	117,220,047
Basic earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 1.78	$ 1.80	$ 1.98
Diluted earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 1.77	$ 1.80	$ 1.97
Kilroy Realty L.P.
Numerator:
Net income available to common unitholders	$ 213,031	$ 214,324	$ 234,898
Allocation to participating securities	(1,967)	(1,233)	(1,272)
Numerator for basic and diluted net income available to common unitholders	$ 211,064	$ 213,091	$ 233,626
Denominator:
Basic weighted average vested units outstanding (in shares)	118,799,685	118,310,747	117,957,149
Effect of dilutive securities (in shares)	507,876	346,082	413,472
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares)	119,307,561	118,656,829	118,370,621
Basic earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 1.78	$ 1.80	$ 1.98
Diluted earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 1.77	$ 1.80	$ 1.97

Supplemental Cash Flow Inform_5

Supplemental Cash Flow Information of the Company - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	$ 77,871	$ 74,052	$ 72,973
Cash paid for interest, net of capitalized interest of $77,871, $74,052, and $72,973 as of December 31, 2024, 2023, and 2022, respectively	126,668	105,767	79,634
Cash paid for amounts included in the measurement of ground lease liabilities	6,484	6,733	6,447
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	54,190	95,575	97,729
Tenant improvements funded directly by tenants	2,745	7,364	6,772
Remeasurement of ground lease liability and related right of use ground lease asset	4,782	0	0
NON-CASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders (Notes 14)	$ 64,850	$ 64,440	$ 64,285

Supplemental Cash Flow Inform_6

Supplemental Cash Flow Information of the Company - Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	$ 165,690	$ 510,163	$ 347,379	$ 414,077
Restricted cash	0	0	0	13,006
Cash and cash equivalents and restricted cash	$ 165,690	$ 510,163	$ 347,379	$ 427,083

Supplemental Cash Flow Inform_7

Supplemental Cash Flow Information of the Operating Partnership - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	$ 77,871	$ 74,052	$ 72,973
Cash paid for interest, net of capitalized interest of $77,871, $74,052, and $72,973 as of December 31, 2024, 2023, and 2022, respectively	126,668	105,767	79,634
Cash paid for amounts included in the measurement of ground lease liabilities	6,484	6,733	6,447
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	54,190	95,575	97,729
Tenant improvements funded directly by tenants	2,745	7,364	6,772
Remeasurement of ground lease liability and related right of use ground lease asset	4,782	0	0
NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Note 15)	64,850	64,440	64,285
Kilroy Realty L.P.
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	77,871	74,052	72,973
Cash paid for interest, net of capitalized interest of $77,871, $74,052, and $72,973 as of December 31, 2024, 2023, and 2022, respectively	126,668	105,767	79,634
Cash paid for amounts included in the measurement of ground lease liabilities	6,484	6,733	6,447
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	54,190	95,575	97,729
Tenant improvements funded directly by tenants	2,745	7,364	6,772
Remeasurement of ground lease liability and related right of use ground lease asset	4,782	0	0
NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Note 15)	$ 64,850	$ 64,440	$ 64,285

Supplemental Cash Flow Inform_8

Supplemental Cash Flow Information of the Operating Partnership - Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	$ 165,690	$ 510,163	$ 347,379	$ 414,077
Restricted cash	0	0	0	13,006
Cash and cash equivalents and restricted cash	165,690	510,163	347,379	427,083
Kilroy Realty L.P.
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	165,690	510,163	347,379	414,077
Restricted cash	0	0	0	13,006
Cash and cash equivalents and restricted cash	$ 165,690	$ 510,163	$ 347,379	$ 427,083

Tax Treatment of Distribution_2

Tax Treatment of Distributions - Dividends (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Tax Treatment of Distributions [Abstract]
Dividends declared per share of common stock ( in dollars per share)	$ 2.16	$ 2.16	$ 2.120
Less: Dividends declared in the current year and paid in the following year ( in dollars per share)	(0.540)	(0.540)	(0.540)
Add: Dividends declared in the prior year and paid in the current year ( in dollars per share)	0.540	0.540	0.520
Dividends paid per share of common stock (in dollars per share)	$ 2.160	$ 2.160	$ 2.100

Tax Treatment of Distribution_3

Tax Treatment of Distributions - Dividends Tax Treatment (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 2.160	$ 2.160	$ 2.100
Capital gains, federal statutory tax rate	20%
Ordinary income | Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 1.916	$ 2.087	$ 1.865
Dividends paid per share of common stock, percentage	88.70%	96.63%	88.80%
Qualified dividend | Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Dividends paid per share of common stock, percentage	0.05%	0.04%	0.02%
Return of capital | Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 0.238	$ 0.069	$ 0.230
Dividends paid per share of common stock, percentage	11.02%	3.21%	10.99%
Capital gains | Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 0.005	$ 0.003	$ 0.004
Dividends paid per share of common stock, percentage	0.23%	0.12%	0.19%
Unrecaptured section 1250 gains | Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 0	$ 0	$ 0
Dividends paid per share of common stock, percentage	0%	0%	0%
Tax treatment | Common Stock
Income Tax Treatment of Dividends Paid [Line Items]
Dividends paid per share of common stock (in dollars per share)	$ 2.160	$ 2.160	$ 2.100
Dividends paid per share of common stock, percentage	100%	100%	100%

Segments (Details)

Segments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 reportableSegment	Dec. 31, 2024 operatingSegment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting [Abstract]
Number of operating segments		1	1
Number of reportable segments | reportableSegment		1
REVENUES (Note 2):
Rental income (Note 18)	$ 1,118,115			$ 1,117,737	$ 1,086,018
Other property income	17,514			11,957	10,969
Total revenues	1,135,629			1,129,694	1,096,987
EXPENSES:
Property expenses	243,441			228,964	202,744
Real estate taxes	108,951			105,868	105,869
Ground leases (Note 19)	11,715			9,732	7,565
General and administrative expenses (Note 16)	72,066			93,434	93,642
Leasing costs	8,764			6,506	4,879
Depreciation and amortization (Notes 2 and 7)	356,182			355,278	357,611
Total expenses	801,119			799,782	772,310
OTHER INCOME (EXPENSES):
Interest and other income, net (Note 20)	37,752			22,592	1,765
Interest expense (Note 10)	(145,287)			(114,216)	(84,278)
Gains on sales of depreciable operating properties (Note 4)	0			0	17,329
Gain on sales of long-lived assets	5,979			0	0
Total other (expenses) income	(101,556)			(91,624)	(65,184)
Net income	232,954			238,288	259,493
Office and Life Science Properties Segment
REVENUES (Note 2):
Rental income (Note 18)	1,118,115			1,117,737	1,086,018
Other property income	17,514			11,957	10,969
Total revenues	1,135,629			1,129,694	1,096,987
EXPENSES:
Property expenses	243,441			228,964	202,744
Real estate taxes	108,951			105,868	105,869
Ground leases (Note 19)	11,715			9,732	7,565
General and administrative expenses (Note 16)	72,066			93,434	93,642
Leasing costs	8,764			6,506	4,879
Depreciation and amortization (Notes 2 and 7)	356,182			355,278	357,611
Total expenses	801,119			799,782	772,310
OTHER INCOME (EXPENSES):
Interest and other income, net (Note 20)	37,752			22,592	1,765
Interest expense (Note 10)	(145,287)			(114,216)	(84,278)
Gains on sales of depreciable operating properties (Note 4)	0			0	17,329
Gain on sales of long-lived assets	5,979			0	0
Total other (expenses) income	(101,556)			(91,624)	(65,184)
Net income	$ 232,954			$ 238,288	$ 259,493

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts - Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Uncollectible tenant receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 1,567	$ 2,233	$ 2,062
Charged to Costs and Expenses	374	1,524	1,447
Deductions	(1,627)	(2,190)	(1,276)
Balance at End of Period	314	1,567	2,233
Allowance for deferred rent
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	728	965	612
Charged to Costs and Expenses	0	667	864
Deductions	(728)	(904)	(511)
Balance at End of Period	$ 0	$ 728	$ 965

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) ft²	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 606,688
Initial cost, land and improvements	2,569,615
Initial cost, buildings and Improvements	2,974,035
Costs Capitalized Subsequent  to Acquisition/ Improvement	7,115,545
Land and improvements, gross	2,662,706
Buildings and improvements, gross	9,996,489
Land and improvements and buildings and improvements, gross	12,659,195
Accumulated Depreciation	$ 2,824,616	$ 2,518,304	$ 2,218,710	$ 2,003,656
Rentable square feet (unaudited) | ft²	17,142,721
Total other (expenses) income	$ (101,556)	$ (91,624)	$ (65,184)
3101 - 3243 S. La Cienega Blvd., Culver City, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	150,718
Initial cost, buildings and Improvements	31,033
Costs Capitalized Subsequent  to Acquisition/ Improvement	3,946
Land and improvements, gross	150,718
Buildings and improvements, gross	34,979
Land and improvements and buildings and improvements, gross	185,697
Accumulated Depreciation	$ 24,483
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	166,207
2240 E. Imperial Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,044
Initial cost, buildings and Improvements	11,763
Costs Capitalized Subsequent  to Acquisition/ Improvement	30,549
Land and improvements, gross	1,048
Buildings and improvements, gross	42,308
Land and improvements and buildings and improvements, gross	43,356
Accumulated Depreciation	$ 32,678
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	122,870
2250 E. Imperial Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,579
Initial cost, buildings and Improvements	29,062
Costs Capitalized Subsequent  to Acquisition/ Improvement	37,806
Land and improvements, gross	2,547
Buildings and improvements, gross	66,900
Land and improvements and buildings and improvements, gross	69,447
Accumulated Depreciation	$ 62,771
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	298,728
2260 E. Imperial Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,518
Initial cost, buildings and Improvements	28,370
Costs Capitalized Subsequent  to Acquisition/ Improvement	37,660
Land and improvements, gross	2,547
Buildings and improvements, gross	66,001
Land and improvements and buildings and improvements, gross	68,548
Accumulated Depreciation	$ 27,479
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	298,728
909 N. Pacific Coast Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,577
Initial cost, buildings and Improvements	34,042
Costs Capitalized Subsequent  to Acquisition/ Improvement	56,884
Land and improvements, gross	3,565
Buildings and improvements, gross	90,938
Land and improvements and buildings and improvements, gross	94,503
Accumulated Depreciation	$ 58,445
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	244,880
999 N. Pacific Coast Highway, El Segundo, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,407
Initial cost, buildings and Improvements	34,326
Costs Capitalized Subsequent  to Acquisition/ Improvement	18,843
Land and improvements, gross	1,407
Buildings and improvements, gross	53,169
Land and improvements and buildings and improvements, gross	54,576
Accumulated Depreciation	$ 35,932
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	138,389
1350 Ivar Ave., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,575
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	14,279
Land and improvements, gross	1,575
Buildings and improvements, gross	14,279
Land and improvements and buildings and improvements, gross	15,854
Accumulated Depreciation	$ 1,686
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	16,448
1355 Vine St., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 17,588
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	120,284
Land and improvements, gross	17,588
Buildings and improvements, gross	120,284
Land and improvements and buildings and improvements, gross	137,872
Accumulated Depreciation	$ 14,689
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	183,129
1375 Vine St., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 15,578
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	103,352
Land and improvements, gross	15,578
Buildings and improvements, gross	103,352
Land and improvements and buildings and improvements, gross	118,930
Accumulated Depreciation	$ 12,566
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	159,236
1395 Vine St., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 278
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	3,261
Land and improvements, gross	278
Buildings and improvements, gross	3,261
Land and improvements and buildings and improvements, gross	3,539
Accumulated Depreciation	$ 388
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	2,575
1500 N. El Centro Ave., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 9,235
Initial cost, buildings and Improvements	21
Costs Capitalized Subsequent  to Acquisition/ Improvement	64,018
Land and improvements, gross	9,235
Buildings and improvements, gross	64,039
Land and improvements and buildings and improvements, gross	73,274
Accumulated Depreciation	$ 19,739
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	113,447
1525 N. Gower St., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,318
Initial cost, buildings and Improvements	3
Costs Capitalized Subsequent  to Acquisition/ Improvement	9,771
Land and improvements, gross	1,318
Buildings and improvements, gross	9,774
Land and improvements and buildings and improvements, gross	11,092
Accumulated Depreciation	$ 2,920
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	9,610
1575 N. Gower St., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 22,153
Initial cost, buildings and Improvements	51
Costs Capitalized Subsequent  to Acquisition/ Improvement	120,168
Land and improvements, gross	22,153
Buildings and improvements, gross	120,219
Land and improvements and buildings and improvements, gross	142,372
Accumulated Depreciation	$ 30,223
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	264,430
6115 W. Sunset Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,313
Initial cost, buildings and Improvements	3
Costs Capitalized Subsequent  to Acquisition/ Improvement	17,435
Land and improvements, gross	2,455
Buildings and improvements, gross	16,296
Land and improvements and buildings and improvements, gross	18,751
Accumulated Depreciation	$ 5,988
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	26,238
6121 W. Sunset Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 11,120
Initial cost, buildings and Improvements	4,256
Costs Capitalized Subsequent  to Acquisition/ Improvement	44,205
Land and improvements, gross	8,703
Buildings and improvements, gross	50,878
Land and improvements and buildings and improvements, gross	59,581
Accumulated Depreciation	$ 14,768
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	93,418
6255 W. Sunset Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 18,111
Initial cost, buildings and Improvements	60,320
Costs Capitalized Subsequent  to Acquisition/ Improvement	56,481
Land and improvements, gross	18,111
Buildings and improvements, gross	116,801
Land and improvements and buildings and improvements, gross	134,912
Accumulated Depreciation	$ 63,863
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	325,772
3750 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	1,941
Costs Capitalized Subsequent  to Acquisition/ Improvement	13,679
Land and improvements, gross	0
Buildings and improvements, gross	15,620
Land and improvements and buildings and improvements, gross	15,620
Accumulated Depreciation	$ 13,303
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	10,718
3760 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	17,467
Costs Capitalized Subsequent  to Acquisition/ Improvement	24,129
Land and improvements, gross	0
Buildings and improvements, gross	41,596
Land and improvements and buildings and improvements, gross	41,596
Accumulated Depreciation	$ 33,855
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	166,761
3780 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	22,319
Costs Capitalized Subsequent  to Acquisition/ Improvement	41,111
Land and improvements, gross	0
Buildings and improvements, gross	63,430
Land and improvements and buildings and improvements, gross	63,430
Accumulated Depreciation	$ 50,720
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	221,452
3800 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	19,408
Costs Capitalized Subsequent  to Acquisition/ Improvement	25,730
Land and improvements, gross	0
Buildings and improvements, gross	45,138
Land and improvements and buildings and improvements, gross	45,138
Accumulated Depreciation	$ 33,291
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	192,476
3840 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	13,586
Costs Capitalized Subsequent  to Acquisition/ Improvement	30,210
Land and improvements, gross	0
Buildings and improvements, gross	43,796
Land and improvements and buildings and improvements, gross	43,796
Accumulated Depreciation	$ 22,382
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	138,441
3880 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	9,704
Costs Capitalized Subsequent  to Acquisition/ Improvement	12,848
Land and improvements, gross	0
Buildings and improvements, gross	22,552
Land and improvements and buildings and improvements, gross	22,552
Accumulated Depreciation	$ 7,944
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	96,923
3900 Kilroy Airport Way, Long Beach, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	12,615
Costs Capitalized Subsequent  to Acquisition/ Improvement	21,523
Land and improvements, gross	0
Buildings and improvements, gross	34,138
Land and improvements and buildings and improvements, gross	34,138
Accumulated Depreciation	$ 23,230
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	130,935
8560 W. Sunset Blvd., West Hollywood, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 9,720
Initial cost, buildings and Improvements	50,956
Costs Capitalized Subsequent  to Acquisition/ Improvement	8,067
Land and improvements, gross	9,720
Buildings and improvements, gross	59,023
Land and improvements and buildings and improvements, gross	68,743
Accumulated Depreciation	$ 17,404
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	76,359
8570 W. Sunset Blvd., West Hollywood, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 31,693
Initial cost, buildings and Improvements	27,974
Costs Capitalized Subsequent  to Acquisition/ Improvement	7,277
Land and improvements, gross	31,693
Buildings and improvements, gross	35,251
Land and improvements and buildings and improvements, gross	66,944
Accumulated Depreciation	$ 10,491
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	49,276
8580 W. Sunset Blvd., West Hollywood, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 10,013
Initial cost, buildings and Improvements	3,695
Costs Capitalized Subsequent  to Acquisition/ Improvement	1,847
Land and improvements, gross	10,013
Buildings and improvements, gross	5,542
Land and improvements and buildings and improvements, gross	15,555
Accumulated Depreciation	$ 1,807
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	6,875
8590 W. Sunset Blvd., West Hollywood, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 39,954
Initial cost, buildings and Improvements	27,884
Costs Capitalized Subsequent  to Acquisition/ Improvement	6,162
Land and improvements, gross	39,954
Buildings and improvements, gross	34,046
Land and improvements and buildings and improvements, gross	74,000
Accumulated Depreciation	$ 9,816
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	56,750
12100 W. Olympic Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 352
Initial cost, buildings and Improvements	45,611
Costs Capitalized Subsequent  to Acquisition/ Improvement	27,407
Land and improvements, gross	9,633
Buildings and improvements, gross	63,737
Land and improvements and buildings and improvements, gross	73,370
Accumulated Depreciation	$ 39,243
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	155,679
12200 W. Olympic Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,329
Initial cost, buildings and Improvements	35,488
Costs Capitalized Subsequent  to Acquisition/ Improvement	29,817
Land and improvements, gross	3,977
Buildings and improvements, gross	65,657
Land and improvements and buildings and improvements, gross	69,634
Accumulated Depreciation	$ 50,837
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	154,544
12233 W. Olympic Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 22,100
Initial cost, buildings and Improvements	53,170
Costs Capitalized Subsequent  to Acquisition/ Improvement	7,029
Land and improvements, gross	22,100
Buildings and improvements, gross	60,199
Land and improvements and buildings and improvements, gross	82,299
Accumulated Depreciation	$ 24,095
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	156,746
12312 W. Olympic Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,325
Initial cost, buildings and Improvements	12,202
Costs Capitalized Subsequent  to Acquisition/ Improvement	12,671
Land and improvements, gross	3,399
Buildings and improvements, gross	24,799
Land and improvements and buildings and improvements, gross	28,198
Accumulated Depreciation	$ 21,030
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	78,900
2100/2110 Colorado Ave., Santa Monica, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,474
Initial cost, buildings and Improvements	26,087
Costs Capitalized Subsequent  to Acquisition/ Improvement	20,980
Land and improvements, gross	5,476
Buildings and improvements, gross	47,065
Land and improvements and buildings and improvements, gross	52,541
Accumulated Depreciation	$ 33,534
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	104,853
501 Santa Monica Blvd., Santa Monica, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,547
Initial cost, buildings and Improvements	12,044
Costs Capitalized Subsequent  to Acquisition/ Improvement	19,568
Land and improvements, gross	4,551
Buildings and improvements, gross	31,608
Land and improvements and buildings and improvements, gross	36,159
Accumulated Depreciation	$ 25,203
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	78,509
12225 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,700
Initial cost, buildings and Improvements	9,633
Costs Capitalized Subsequent  to Acquisition/ Improvement	4,870
Land and improvements, gross	1,673
Buildings and improvements, gross	14,530
Land and improvements and buildings and improvements, gross	16,203
Accumulated Depreciation	$ 11,378
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	58,401
12235 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,507
Initial cost, buildings and Improvements	8,543
Costs Capitalized Subsequent  to Acquisition/ Improvement	10,372
Land and improvements, gross	1,540
Buildings and improvements, gross	18,882
Land and improvements and buildings and improvements, gross	20,422
Accumulated Depreciation	$ 14,674
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	53,751
12340 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,201
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	34,342
Land and improvements, gross	4,201
Buildings and improvements, gross	34,342
Land and improvements and buildings and improvements, gross	38,543
Accumulated Depreciation	$ 5,413
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	109,307
12390 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,453
Initial cost, buildings and Improvements	11,981
Costs Capitalized Subsequent  to Acquisition/ Improvement	12,895
Land and improvements, gross	3,453
Buildings and improvements, gross	24,876
Land and improvements and buildings and improvements, gross	28,329
Accumulated Depreciation	$ 15,657
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	73,238
12770 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 9,360
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	35,074
Land and improvements, gross	9,360
Buildings and improvements, gross	35,074
Land and improvements and buildings and improvements, gross	44,434
Accumulated Depreciation	$ 9,531
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	75,035
12780 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 18,398
Initial cost, buildings and Improvements	54,954
Costs Capitalized Subsequent  to Acquisition/ Improvement	24,295
Land and improvements, gross	18,398
Buildings and improvements, gross	79,249
Land and improvements and buildings and improvements, gross	97,647
Accumulated Depreciation	$ 32,182
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	140,591
12790 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 10,252
Initial cost, buildings and Improvements	21,236
Costs Capitalized Subsequent  to Acquisition/ Improvement	17,143
Land and improvements, gross	10,252
Buildings and improvements, gross	38,379
Land and improvements and buildings and improvements, gross	48,631
Accumulated Depreciation	$ 14,435
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	87,944
12830 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 28,645
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	113,154
Land and improvements, gross	28,645
Buildings and improvements, gross	113,154
Land and improvements and buildings and improvements, gross	141,799
Accumulated Depreciation	$ 16,697
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	196,444
12860 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 11,326
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	51,970
Land and improvements, gross	11,326
Buildings and improvements, gross	51,970
Land and improvements and buildings and improvements, gross	63,296
Accumulated Depreciation	$ 7,822
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	92,042
12348 High Bluff Dr., Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,629
Initial cost, buildings and Improvements	3,096
Costs Capitalized Subsequent  to Acquisition/ Improvement	9,084
Land and improvements, gross	1,629
Buildings and improvements, gross	12,180
Land and improvements and buildings and improvements, gross	13,809
Accumulated Depreciation	$ 9,465
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	39,192
12400 High Bluff Dr., Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 15,167
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	49,940
Land and improvements, gross	15,167
Buildings and improvements, gross	49,940
Land and improvements and buildings and improvements, gross	65,107
Accumulated Depreciation	$ 13,021
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	216,518
12707 High Bluff Dr., Del Mar, CA (7)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,013
Initial cost, buildings and Improvements	8,032
Costs Capitalized Subsequent  to Acquisition/ Improvement	915
Land and improvements, gross	3,013
Buildings and improvements, gross	8,947
Land and improvements and buildings and improvements, gross	11,960
Accumulated Depreciation	$ 148
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	59,245
12777 High Bluff Dr., Del Mar, CA (7)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,013
Initial cost, buildings and Improvements	6,134
Costs Capitalized Subsequent  to Acquisition/ Improvement	687
Land and improvements, gross	3,013
Buildings and improvements, gross	6,821
Land and improvements and buildings and improvements, gross	9,834
Accumulated Depreciation	$ 115
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	44,486
3579 Valley Centre Dr., Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,167
Initial cost, buildings and Improvements	6,897
Costs Capitalized Subsequent  to Acquisition/ Improvement	11,834
Land and improvements, gross	2,858
Buildings and improvements, gross	18,040
Land and improvements and buildings and improvements, gross	20,898
Accumulated Depreciation	$ 12,631
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	54,960
3611 Valley Centre Dr., Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,184
Initial cost, buildings and Improvements	19,352
Costs Capitalized Subsequent  to Acquisition/ Improvement	29,673
Land and improvements, gross	5,259
Buildings and improvements, gross	47,950
Land and improvements and buildings and improvements, gross	53,209
Accumulated Depreciation	$ 35,382
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	132,425
3661 Valley Centre Dr., Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,038
Initial cost, buildings and Improvements	21,144
Costs Capitalized Subsequent  to Acquisition/ Improvement	20,770
Land and improvements, gross	4,725
Buildings and improvements, gross	41,227
Land and improvements and buildings and improvements, gross	45,952
Accumulated Depreciation	$ 31,791
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	131,662
3721 Valley Centre Dr., Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,297
Initial cost, buildings and Improvements	18,967
Costs Capitalized Subsequent  to Acquisition/ Improvement	18,378
Land and improvements, gross	4,254
Buildings and improvements, gross	37,388
Land and improvements and buildings and improvements, gross	41,642
Accumulated Depreciation	$ 24,813
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	117,777
3811 Valley Centre Dr., Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,452
Initial cost, buildings and Improvements	16,152
Costs Capitalized Subsequent  to Acquisition/ Improvement	21,985
Land and improvements, gross	4,457
Buildings and improvements, gross	37,132
Land and improvements and buildings and improvements, gross	41,589
Accumulated Depreciation	$ 27,962
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	118,912
3745 Paseo Place, Del Mar, CA (Retail)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 24,358
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	76,146
Land and improvements, gross	24,358
Buildings and improvements, gross	76,146
Land and improvements and buildings and improvements, gross	100,504
Accumulated Depreciation	$ 13,728
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	95,871
13480 Evening Creek Dr. North, San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,997
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	67,507
Land and improvements, gross	7,997
Buildings and improvements, gross	67,507
Land and improvements and buildings and improvements, gross	75,504
Accumulated Depreciation	$ 31,255
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	143,401
13500 Evening Creek Dr. North, San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,581
Initial cost, buildings and Improvements	35,903
Costs Capitalized Subsequent  to Acquisition/ Improvement	25,885
Land and improvements, gross	7,580
Buildings and improvements, gross	61,789
Land and improvements and buildings and improvements, gross	69,369
Accumulated Depreciation	$ 36,868
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	137,660
13520 Evening Creek Dr. North, San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,581
Initial cost, buildings and Improvements	35,903
Costs Capitalized Subsequent  to Acquisition/ Improvement	28,348
Land and improvements, gross	7,580
Buildings and improvements, gross	64,252
Land and improvements and buildings and improvements, gross	71,832
Accumulated Depreciation	$ 38,951
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	146,701
2100 Kettner Blvd., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 19,861
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	108,772
Land and improvements, gross	19,861
Buildings and improvements, gross	108,772
Land and improvements and buildings and improvements, gross	128,633
Accumulated Depreciation	$ 7,089
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	212,423
2305 Historic Decatur Rd., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,240
Initial cost, buildings and Improvements	22,220
Costs Capitalized Subsequent  to Acquisition/ Improvement	11,932
Land and improvements, gross	5,240
Buildings and improvements, gross	34,152
Land and improvements and buildings and improvements, gross	39,392
Accumulated Depreciation	$ 18,231
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	107,456
4690 Executive Dr., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	20,929
Land and improvements, gross	1,624
Buildings and improvements, gross	19,305
Land and improvements and buildings and improvements, gross	20,929
Accumulated Depreciation	$ 713
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	0
9455 Towne Centre Dr., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,081
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	79,595
Land and improvements, gross	6,081
Buildings and improvements, gross	79,595
Land and improvements and buildings and improvements, gross	85,676
Accumulated Depreciation	$ 9,798
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	160,444
9514 Towne Centre Dr., San Diego, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,928
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	47,756
Land and improvements, gross	4,928
Buildings and improvements, gross	47,756
Land and improvements and buildings and improvements, gross	52,684
Accumulated Depreciation	$ 2,069
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	70,616
4100 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,835
Initial cost, buildings and Improvements	15,526
Costs Capitalized Subsequent  to Acquisition/ Improvement	1,525
Land and improvements, gross	4,860
Buildings and improvements, gross	17,026
Land and improvements and buildings and improvements, gross	21,886
Accumulated Depreciation	$ 7,204
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	47,643
4200 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,798
Initial cost, buildings and Improvements	15,406
Costs Capitalized Subsequent  to Acquisition/ Improvement	8,364
Land and improvements, gross	4,662
Buildings and improvements, gross	23,906
Land and improvements and buildings and improvements, gross	28,568
Accumulated Depreciation	$ 10,605
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	43,600
4300 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,527
Initial cost, buildings and Improvements	20,958
Costs Capitalized Subsequent  to Acquisition/ Improvement	8,047
Land and improvements, gross	6,470
Buildings and improvements, gross	29,062
Land and improvements and buildings and improvements, gross	35,532
Accumulated Depreciation	$ 12,961
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	63,430
4400 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	3,237
Land and improvements, gross	0
Buildings and improvements, gross	3,237
Land and improvements and buildings and improvements, gross	3,237
Accumulated Depreciation	$ 2,177
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	0
4500 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,527
Initial cost, buildings and Improvements	20,957
Costs Capitalized Subsequent  to Acquisition/ Improvement	5,795
Land and improvements, gross	6,470
Buildings and improvements, gross	26,809
Land and improvements and buildings and improvements, gross	33,279
Accumulated Depreciation	$ 11,874
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	63,429
4600 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,798
Initial cost, buildings and Improvements	15,406
Costs Capitalized Subsequent  to Acquisition/ Improvement	5,286
Land and improvements, gross	4,939
Buildings and improvements, gross	20,551
Land and improvements and buildings and improvements, gross	25,490
Accumulated Depreciation	$ 9,832
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	48,413
4700 Bohannon Dr., Menlo Park, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,527
Initial cost, buildings and Improvements	20,958
Costs Capitalized Subsequent  to Acquisition/ Improvement	1,576
Land and improvements, gross	6,470
Buildings and improvements, gross	22,591
Land and improvements and buildings and improvements, gross	29,061
Accumulated Depreciation	$ 9,755
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	63,429
1290 - 1300 Terra Bella Ave., Mountain View, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 28,730
Initial cost, buildings and Improvements	27,555
Costs Capitalized Subsequent  to Acquisition/ Improvement	13,130
Land and improvements, gross	28,730
Buildings and improvements, gross	40,685
Land and improvements and buildings and improvements, gross	69,415
Accumulated Depreciation	$ 11,591
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	114,175
680 E. Middlefield Rd., Mountain View, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 34,755
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	56,759
Land and improvements, gross	34,755
Buildings and improvements, gross	56,759
Land and improvements and buildings and improvements, gross	91,514
Accumulated Depreciation	$ 19,459
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	171,676
690 E. Middlefield Rd., Mountain View, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 34,605
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	56,515
Land and improvements, gross	34,605
Buildings and improvements, gross	56,515
Land and improvements and buildings and improvements, gross	91,120
Accumulated Depreciation	$ 19,376
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	171,215
1701 Page Mill Rd., Palo Alto, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	99,522
Costs Capitalized Subsequent  to Acquisition/ Improvement	111
Land and improvements, gross	0
Buildings and improvements, gross	99,633
Land and improvements and buildings and improvements, gross	99,633
Accumulated Depreciation	$ 24,020
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	128,688
3150 Porter Dr., Palo Alto, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	21,715
Costs Capitalized Subsequent  to Acquisition/ Improvement	6,446
Land and improvements, gross	0
Buildings and improvements, gross	28,161
Land and improvements and buildings and improvements, gross	28,161
Accumulated Depreciation	$ 7,582
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	36,886
900 Jefferson Ave., Redwood City, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 16,668
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	109,620
Land and improvements, gross	18,063
Buildings and improvements, gross	108,225
Land and improvements and buildings and improvements, gross	126,288
Accumulated Depreciation	$ 35,124
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	228,226
900 Middlefield Rd., Redwood City, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,959
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	64,606
Land and improvements, gross	8,626
Buildings and improvements, gross	63,939
Land and improvements and buildings and improvements, gross	72,565
Accumulated Depreciation	$ 16,538
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	119,616
100 Hooper St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 78,564
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	197,034
Land and improvements, gross	85,510
Buildings and improvements, gross	190,088
Land and improvements and buildings and improvements, gross	275,598
Accumulated Depreciation	$ 35,842
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	417,914
100 First St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 49,150
Initial cost, buildings and Improvements	131,238
Costs Capitalized Subsequent  to Acquisition/ Improvement	84,007
Land and improvements, gross	49,150
Buildings and improvements, gross	215,245
Land and improvements and buildings and improvements, gross	264,395
Accumulated Depreciation	$ 115,810
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	480,457
303 Second St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 63,550
Initial cost, buildings and Improvements	154,153
Costs Capitalized Subsequent  to Acquisition/ Improvement	120,741
Land and improvements, gross	63,550
Buildings and improvements, gross	274,894
Land and improvements and buildings and improvements, gross	338,444
Accumulated Depreciation	$ 146,435
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	784,658
201 Third St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 19,260
Initial cost, buildings and Improvements	84,018
Costs Capitalized Subsequent  to Acquisition/ Improvement	79,707
Land and improvements, gross	19,260
Buildings and improvements, gross	163,725
Land and improvements and buildings and improvements, gross	182,985
Accumulated Depreciation	$ 103,058
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	346,538
360 Third St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	88,235
Costs Capitalized Subsequent  to Acquisition/ Improvement	128,515
Land and improvements, gross	28,504
Buildings and improvements, gross	188,246
Land and improvements and buildings and improvements, gross	216,750
Accumulated Depreciation	$ 81,239
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	436,357
250 Brannan St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,630
Initial cost, buildings and Improvements	22,770
Costs Capitalized Subsequent  to Acquisition/ Improvement	10,797
Land and improvements, gross	7,630
Buildings and improvements, gross	33,567
Land and improvements and buildings and improvements, gross	41,197
Accumulated Depreciation	$ 16,440
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	100,850
301 Brannan St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,910
Initial cost, buildings and Improvements	22,450
Costs Capitalized Subsequent  to Acquisition/ Improvement	17,204
Land and improvements, gross	5,910
Buildings and improvements, gross	39,654
Land and improvements and buildings and improvements, gross	45,564
Accumulated Depreciation	$ 17,652
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	82,834
333 Brannan St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 18,645
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	80,685
Land and improvements, gross	18,645
Buildings and improvements, gross	80,685
Land and improvements and buildings and improvements, gross	99,330
Accumulated Depreciation	$ 21,215
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	185,602
345 Brannan St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 29,405
Initial cost, buildings and Improvements	113,179
Costs Capitalized Subsequent  to Acquisition/ Improvement	1,358
Land and improvements, gross	29,403
Buildings and improvements, gross	114,539
Land and improvements and buildings and improvements, gross	143,942
Accumulated Depreciation	$ 20,282
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	110,050
350 Mission St., San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 52,815
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	212,742
Land and improvements, gross	52,815
Buildings and improvements, gross	212,742
Land and improvements and buildings and improvements, gross	265,557
Accumulated Depreciation	$ 57,855
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	455,340
345 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 13,745
Initial cost, buildings and Improvements	18,575
Costs Capitalized Subsequent  to Acquisition/ Improvement	1
Land and improvements, gross	13,745
Buildings and improvements, gross	18,576
Land and improvements and buildings and improvements, gross	32,321
Accumulated Depreciation	$ 3,948
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	40,410
347 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 14,071
Initial cost, buildings and Improvements	18,289
Costs Capitalized Subsequent  to Acquisition/ Improvement	44
Land and improvements, gross	14,071
Buildings and improvements, gross	18,333
Land and improvements and buildings and improvements, gross	32,404
Accumulated Depreciation	$ 3,905
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	39,780
349 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 23,112
Initial cost, buildings and Improvements	22,601
Costs Capitalized Subsequent  to Acquisition/ Improvement	352
Land and improvements, gross	23,112
Buildings and improvements, gross	22,953
Land and improvements and buildings and improvements, gross	46,065
Accumulated Depreciation	$ 6,145
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	65,340
350 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 23,719
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	177,042
Land and improvements, gross	23,719
Buildings and improvements, gross	177,042
Land and improvements and buildings and improvements, gross	200,761
Accumulated Depreciation	$ 17,251
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	234,892
352 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 23,449
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	165,497
Land and improvements, gross	23,449
Buildings and improvements, gross	165,497
Land and improvements and buildings and improvements, gross	188,946
Accumulated Depreciation	$ 17,361
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	232,215
354 Oyster Point Blvd., South San Francisco, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 19,538
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	141,041
Land and improvements, gross	19,538
Buildings and improvements, gross	141,041
Land and improvements and buildings and improvements, gross	160,579
Accumulated Depreciation	$ 17,349
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	193,472
505 Mathilda Ave., Sunnyvale, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 37,843
Initial cost, buildings and Improvements	1,163
Costs Capitalized Subsequent  to Acquisition/ Improvement	50,450
Land and improvements, gross	37,943
Buildings and improvements, gross	51,513
Land and improvements and buildings and improvements, gross	89,456
Accumulated Depreciation	$ 15,019
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	212,322
555 Mathilda Ave., Sunnyvale, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 37,843
Initial cost, buildings and Improvements	1,163
Costs Capitalized Subsequent  to Acquisition/ Improvement	50,447
Land and improvements, gross	37,943
Buildings and improvements, gross	51,510
Land and improvements and buildings and improvements, gross	89,453
Accumulated Depreciation	$ 15,018
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	212,322
599 Mathilda Ave., Sunnyvale, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 13,538
Initial cost, buildings and Improvements	12,559
Costs Capitalized Subsequent  to Acquisition/ Improvement	609
Land and improvements, gross	13,538
Buildings and improvements, gross	13,168
Land and improvements and buildings and improvements, gross	26,706
Accumulated Depreciation	$ 6,212
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	76,031
605 Mathilda Ave., Sunnyvale, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 29,014
Initial cost, buildings and Improvements	891
Costs Capitalized Subsequent  to Acquisition/ Improvement	77,281
Land and improvements, gross	29,090
Buildings and improvements, gross	78,096
Land and improvements and buildings and improvements, gross	107,186
Accumulated Depreciation	$ 33,548
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	162,785
601 108th Ave., Bellevue, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	214,095
Costs Capitalized Subsequent  to Acquisition/ Improvement	90,414
Land and improvements, gross	42,680
Buildings and improvements, gross	261,829
Land and improvements and buildings and improvements, gross	304,509
Accumulated Depreciation	$ 127,395
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	490,738
10900 NE 4th St., Bellevue, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 25,080
Initial cost, buildings and Improvements	150,877
Costs Capitalized Subsequent  to Acquisition/ Improvement	55,231
Land and improvements, gross	25,080
Buildings and improvements, gross	206,108
Land and improvements and buildings and improvements, gross	231,188
Accumulated Depreciation	$ 98,543
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	428,557
2001 W. 8th Ave., Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 84,076
Initial cost, buildings and Improvements	371,154
Costs Capitalized Subsequent  to Acquisition/ Improvement	27,388
Land and improvements, gross	84,076
Buildings and improvements, gross	398,542
Land and improvements and buildings and improvements, gross	482,618
Accumulated Depreciation	$ 41,445
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	535,395
333 Dexter Ave. North, Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 42,854
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	328,064
Land and improvements, gross	42,854
Buildings and improvements, gross	328,064
Land and improvements and buildings and improvements, gross	370,918
Accumulated Depreciation	$ 37,737
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	618,766
701 N. 34th St., Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	48,027
Costs Capitalized Subsequent  to Acquisition/ Improvement	12,145
Land and improvements, gross	0
Buildings and improvements, gross	60,172
Land and improvements and buildings and improvements, gross	60,172
Accumulated Depreciation	$ 27,052
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	141,860
801 N. 34th St., Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	58,537
Costs Capitalized Subsequent  to Acquisition/ Improvement	23,824
Land and improvements, gross	0
Buildings and improvements, gross	82,361
Land and improvements and buildings and improvements, gross	82,361
Accumulated Depreciation	$ 33,635
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	173,615
837 N. 34th St., Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	37,404
Costs Capitalized Subsequent  to Acquisition/ Improvement	7,354
Land and improvements, gross	0
Buildings and improvements, gross	44,758
Land and improvements and buildings and improvements, gross	44,758
Accumulated Depreciation	$ 19,792
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	112,487
320 Westlake Ave. North, Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 14,710
Initial cost, buildings and Improvements	82,018
Costs Capitalized Subsequent  to Acquisition/ Improvement	15,219
Land and improvements, gross	14,710
Buildings and improvements, gross	97,237
Land and improvements and buildings and improvements, gross	111,947
Accumulated Depreciation	$ 37,480
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	184,644
321 Terry Ave. North, Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 10,430
Initial cost, buildings and Improvements	60,003
Costs Capitalized Subsequent  to Acquisition/ Improvement	11,066
Land and improvements, gross	10,430
Buildings and improvements, gross	71,069
Land and improvements and buildings and improvements, gross	81,499
Accumulated Depreciation	$ 28,230
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	135,755
401 Terry Ave. North, Seattle, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 22,500
Initial cost, buildings and Improvements	77,046
Costs Capitalized Subsequent  to Acquisition/ Improvement	32
Land and improvements, gross	22,500
Buildings and improvements, gross	77,078
Land and improvements and buildings and improvements, gross	99,578
Accumulated Depreciation	$ 26,718
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	174,530
200 W. 6th St., Austin, TX
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	654,578
Land and improvements, gross	0
Buildings and improvements, gross	654,578
Land and improvements and buildings and improvements, gross	654,578
Accumulated Depreciation	$ 38,398
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	758,975
1550 N. El Centro Avenue, Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 16,970
Initial cost, buildings and Improvements	39
Costs Capitalized Subsequent  to Acquisition/ Improvement	138,148
Land and improvements, gross	16,970
Buildings and improvements, gross	138,187
Land and improvements and buildings and improvements, gross	155,157
Accumulated Depreciation	$ 34,097
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	0
6390 De Longpre Ave., Hollywood, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 12,112
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	162,481
Land and improvements, gross	12,112
Buildings and improvements, gross	162,481
Land and improvements and buildings and improvements, gross	174,593
Accumulated Depreciation	$ 17,436
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	0
3200 Paseo Village Way, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 106,419
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	272,044
Land and improvements, gross	106,419
Buildings and improvements, gross	272,044
Land and improvements and buildings and improvements, gross	378,463
Accumulated Depreciation	$ 38,354
Depreciation life	35 years
Rentable square feet (unaudited) | ft²	0
Office Building | 12830 El Camino Real, Del Mar, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 375,000
Office Building | 12100, 12200 and 12312 W. Olympic Blvd., Los Angeles, CA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	152,668
Office Building | 320 Westlake Ave. North, WA and 321 Terry Avenue North, Lake Union, WA
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	79,020
Operating Properties
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	606,688
Initial cost, land and improvements	1,657,729
Initial cost, buildings and Improvements	2,974,035
Costs Capitalized Subsequent  to Acquisition/ Improvement	5,717,807
Land and improvements, gross	1,750,820
Buildings and improvements, gross	8,598,751
Land and improvements and buildings and improvements, gross	10,349,571
Accumulated Depreciation	$ 2,824,616
Rentable square feet (unaudited) | ft²	17,142,721
Undeveloped land and construction in progress
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 0
Initial cost, land and improvements	911,886
Initial cost, buildings and Improvements	0
Costs Capitalized Subsequent  to Acquisition/ Improvement	1,397,738
Land and improvements, gross	911,886
Buildings and improvements, gross	1,397,738
Land and improvements and buildings and improvements, gross	2,309,624
Accumulated Depreciation	$ 0
Rentable square feet (unaudited) | ft²	0

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation - Narrative (Details) $ in Thousands	Dec. 31, 2024 USD ($) property	Dec. 31, 2023 USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Investment in real estate, federal Income tax basis	$ 10,400,000
Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	4,631,688
Kilroy Realty L.P. | Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Unamortized debt issuance expense	8,489	$ 9,469
3.57% Mortgage Payable due December 2026 | Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	152,700
3.57% Mortgage Payable due December 2026 | Kilroy Realty L.P. | Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	152,668	156,386
4.48% Mortgage Payable due July 2027 | Kilroy Realty L.P. | Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	79,020	81,308
5.90% Mortgage Payable due August 2034 | Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	375,000
5.90% Mortgage Payable due August 2034 | Kilroy Realty L.P. | Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	375,000	$ 375,000
Office Building
Real Estate and Accumulated Depreciation [Line Items]
Unamortized debt issuance expense	$ 8,500
Office Building | Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles
Real Estate and Accumulated Depreciation [Line Items]
Number of buildings | property	5
Residential Tower | Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles
Real Estate and Accumulated Depreciation [Line Items]
Number of buildings | property	1
Building
Real Estate and Accumulated Depreciation [Line Items]
Depreciation life	35 years
Tenant Improvements | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Property depreciable lives	1 year
Tenant Improvements | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Property depreciable lives	20 years

Schedule III - Real Estate an_4

Schedule III - Real Estate and Accumulated Depreciation - Historical Cost Real Estate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Total real estate held for investment, beginning of year	$ 12,241,648	$ 11,732,183	$ 11,292,693
Acquisitions	21,941	0	40,033
Improvements, etc.	400,880	511,866	439,759
Total additions during period	422,821	511,866	479,792
Cost of real estate sold	0	0	(32,855)
Other	(5,274)	(2,401)	(7,447)
Total deductions during period	(5,274)	(2,401)	(40,302)
Total real estate held for investment, end of year	$ 12,659,195	$ 12,241,648	$ 11,732,183

Schedule III - Real Estate an_5

Schedule III - Real Estate and Accumulated Depreciation - Accumulated Depreciation Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Accumulated depreciation, beginning of year	$ 2,518,304	$ 2,218,710	$ 2,003,656
Depreciation of real estate	307,967	300,119	287,799
Total additions during period	307,967	300,119	287,799
Write-offs due to sale	0	0	(19,114)
Other	(1,655)	(525)	(53,631)
Total deductions during period	(1,655)	(525)	(72,745)
Accumulated depreciation, end of year	$ 2,824,616	$ 2,518,304	$ 2,218,710