CONSOLIDATED BALANCE SHEETS (KILROY REALTY, L.P.) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
REAL ESTATE ASSETS
Land and improvements	$ 1,628,848	$ 1,466,166
Buildings and improvements	6,783,092	5,866,477
Undeveloped land and construction in progress	1,778,106	2,296,130
Total real estate assets held for investment	10,190,046	9,628,773
Accumulated depreciation and amortization	(1,798,646)	(1,561,361)
Total real estate assets held for investment, net	8,391,400	8,067,412
CASH AND CASH EQUIVALENTS (Note 23)	731,991	60,044
RESTRICTED CASH (Notes 3, 4 and 23)	91,139	16,300
MARKETABLE SECURITIES (Notes 16 and 19)	27,481	27,098
CURRENT RECEIVABLES, NET (Notes 2 and 6)	12,007	26,489
DEFERRED RENT RECEIVABLES, NET (Notes 2 and 6)	386,658	337,937
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2, 3 and 5)	210,949	212,805
RIGHT OF USE GROUND LEASE ASSETS (Notes 2 and 18)	95,523	96,348
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 7)	53,560	55,661
TOTAL ASSETS	10,000,708	8,900,094
LIABILITIES:
Secured debt, net (Notes 9 and 19)	253,582	258,593
Unsecured debt, net (Notes 9 and 19)	3,670,099	3,049,185
Unsecured line of credit (Notes 9 and 19)	0	245,000
Accounts payable, accrued expenses and other liabilities (Note 18)	445,100	418,848
Ground lease liabilities (Notes 2 and 18)	97,778	98,400
Accrued distributions (Notes 14 and 27)	59,431	53,219
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2, 3, 5 and 10)	128,523	139,488
Rents received in advance and tenant security deposits	68,874	66,503
Total liabilities	4,723,387	4,329,236
COMMITMENTS AND CONTINGENCIES (Note 18)
Partners’ Capital:
TOTAL LIABILITIES AND EQUITY/CAPITAL	10,000,708	8,900,094
Kilroy Realty L.P. [Member]
REAL ESTATE ASSETS
Land and improvements	1,628,848	1,466,166
Buildings and improvements	6,783,092	5,866,477
Undeveloped land and construction in progress	1,778,106	2,296,130
Total real estate assets held for investment	10,190,046	9,628,773
Accumulated depreciation and amortization	(1,798,646)	(1,561,361)
Total real estate assets held for investment, net	8,391,400	8,067,412
CASH AND CASH EQUIVALENTS (Note 23)	731,991	60,044
RESTRICTED CASH (Notes 3, 4 and 23)	91,139	16,300
MARKETABLE SECURITIES (Notes 16 and 19)	27,481	27,098
CURRENT RECEIVABLES, NET (Notes 2 and 6)	12,007	26,489
DEFERRED RENT RECEIVABLES, NET (Notes 2 and 6)	386,658	337,937
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2, 3 and 5)	210,949	212,805
RIGHT OF USE GROUND LEASE ASSETS (Notes 2 and 18)	95,523	96,348
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 7)	53,560	55,661
TOTAL ASSETS	10,000,708	8,900,094
LIABILITIES:
Secured debt, net (Notes 9 and 19)	253,582	258,593
Unsecured debt, net (Notes 9 and 19)	3,670,099	3,049,185
Unsecured line of credit (Notes 9 and 19)	0	245,000
Accounts payable, accrued expenses and other liabilities (Note 18)	445,100	418,848
Ground lease liabilities (Notes 2 and 18)	97,778	98,400
Accrued distributions (Notes 14 and 27)	59,431	53,219
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2, 3, 5 and 10)	128,523	139,488
Rents received in advance and tenant security deposits	68,874	66,503
Total liabilities	4,723,387	4,329,236
COMMITMENTS AND CONTINGENCIES (Note 18)
Partners’ Capital:
Common units, 116,035,827 and 106,016,287 held by the general partner and 1,150,574 and 2,023,287 held by common limited partners issued and outstanding, respectively (Note 14)	5,079,818	4,369,758
Total partners’ capital	5,079,818	4,369,758
Noncontrolling interests in consolidated property partnerships and subsidiaries (Notes 2 and 12)	197,503	201,100
Total capital	5,277,321	4,570,858
TOTAL LIABILITIES AND EQUITY/CAPITAL	$ 10,000,708	$ 8,900,094