CONSOLIDATED BALANCE SHEETS (KILROY REALTY, L.P.) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
REAL ESTATE ASSETS
Land and improvements	$ 1,466,166	$ 1,160,138
Buildings and improvements	5,866,477	5,207,984
Undeveloped land and construction in progress	2,296,130	2,058,510
Total real estate assets held for investment	9,628,773	8,426,632
Accumulated depreciation and amortization	(1,561,361)	(1,391,368)
Total real estate assets held for investment, net	8,067,412	7,035,264
CASH AND CASH EQUIVALENTS (Note 24)	60,044	51,604
RESTRICTED CASH (Notes 3, 4 and 24)	16,300	119,430
MARKETABLE SECURITIES (Notes 16 and 19)	27,098	21,779
CURRENT RECEIVABLES, NET (Notes 2, 6 and 20)	26,489	20,176
DEFERRED RENT RECEIVABLES, NET (Notes 2, 6 and 20)	337,937	267,007
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2, 3 and 5)	212,805	197,574
RIGHT OF USE GROUND LEASE ASSETS (Notes 2 and 18)	96,348
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 7)	55,661	52,873
TOTAL ASSETS	8,900,094	7,765,707
LIABILITIES:
Secured debt, net (Notes 9 and 19)	258,593	335,531
Unsecured debt, net (Notes 9 and 19)	3,049,185	2,552,070
Unsecured line of credit (Notes 9 and 19)	245,000	45,000
Accounts payable, accrued expenses and other liabilities (Note 18)	418,848	374,415
Ground lease liabilities (Notes 2 and 18)	98,400
Accrued distributions (Notes 14 and 28)	53,219	47,559
Deferred revenue and acquisition-related intangible liabilities, net (Notes 3, 5 and 10)	139,488	149,646
Rents received in advance and tenant security deposits	66,503	60,225
Total liabilities	4,329,236	3,564,446
COMMITMENTS AND CONTINGENCIES (Note 18)
Partners’ Capital:
TOTAL LIABILITIES AND EQUITY/CAPITAL	8,900,094	7,765,707
Kilroy Realty L.P. [Member]
REAL ESTATE ASSETS
Land and improvements	1,466,166	1,160,138
Buildings and improvements	5,866,477	5,207,984
Undeveloped land and construction in progress	2,296,130	2,058,510
Total real estate assets held for investment	9,628,773	8,426,632
Accumulated depreciation and amortization	(1,561,361)	(1,391,368)
Total real estate assets held for investment, net	8,067,412	7,035,264
CASH AND CASH EQUIVALENTS (Note 24)	60,044	51,604
RESTRICTED CASH (Notes 3, 4 and 24)	16,300	119,430
MARKETABLE SECURITIES (Notes 16 and 19)	27,098	21,779
CURRENT RECEIVABLES, NET (Notes 2, 6 and 20)	26,489	20,176
DEFERRED RENT RECEIVABLES, NET (Notes 2, 6 and 20)	337,937	267,007
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2, 3 and 5)	212,805	197,574
RIGHT OF USE GROUND LEASE ASSETS (Notes 2 and 18)	96,348
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 7)	55,661	52,873
TOTAL ASSETS	8,900,094	7,765,707
LIABILITIES:
Secured debt, net (Notes 9 and 19)	258,593	335,531
Unsecured debt, net (Notes 9 and 19)	3,049,185	2,552,070
Unsecured line of credit (Notes 9 and 19)	245,000	45,000
Accounts payable, accrued expenses and other liabilities (Note 18)	418,848	374,415
Ground lease liabilities (Notes 2 and 18)	98,400
Accrued distributions (Notes 14 and 28)	53,219	47,559
Deferred revenue and acquisition-related intangible liabilities, net (Notes 3, 5 and 10)	139,488	149,646
Rents received in advance and tenant security deposits	66,503	60,225
Total liabilities	4,329,236	3,564,446
COMMITMENTS AND CONTINGENCIES (Note 18)
Partners’ Capital:
Common units, 106,016,287 and 100,746,988 held by the general partner and 2,023,287 and 2,025,287 held by common limited partners issued and outstanding, respectively (Note 14)	4,369,758	4,003,700
Total partners’ capital	4,369,758	4,003,700
Noncontrolling interests in consolidated property partnerships and subsidiaries (Notes 2 and 12)	201,100	197,561
Total capital	4,570,858	4,201,261
TOTAL LIABILITIES AND EQUITY/CAPITAL	$ 8,900,094	$ 7,765,707