CONSOLIDATED BALANCE SHEETS (KILROY REALTY, L.P.) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
REAL ESTATE ASSETS:
Land and improvements	$ 1,284,582	$ 1,160,138
Buildings and improvements	5,712,448	5,207,984
Undeveloped land and construction in progress	1,827,528	2,058,510
Total real estate assets held for investment	8,824,558	8,426,632
Accumulated depreciation and amortization	(1,480,766)	(1,391,368)
Total real estate assets held for investment, net	7,343,792	7,035,264
CASH AND CASH EQUIVALENTS	52,415	51,604
RESTRICTED CASH	6,300	119,430
MARKETABLE SECURITIES (Note 11)	25,203	21,779
CURRENT RECEIVABLES, NET (Note 1)	27,563	20,176
DEFERRED RENT RECEIVABLES, NET (Note 1)	297,358	267,007
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Note 1)	203,451	197,574
RIGHT OF USE GROUND LEASE ASSETS (Notes 1 and 10)	82,647
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 3)	55,992	52,873
TOTAL ASSETS	8,094,721	7,765,707
LIABILITIES:
Secured debt, net (Notes 4 and 11)	259,455	335,531
Unsecured debt, net (Notes 4 and 11)	2,553,651	2,552,070
Unsecured line of credit (Notes 4, 11 and 16)	375,000	45,000
Accounts payable, accrued expenses and other liabilities	385,567	374,415
Ground lease liabilities (Notes 1 and 10)	87,082
Accrued distributions (Note 16)	50,800	47,559
Deferred revenue and acquisition-related intangible liabilities, net	136,266	149,646
Rents received in advance and tenant security deposits	59,997	60,225
Total liabilities	3,907,818	3,564,446
COMMITMENTS AND CONTINGENCIES
CAPITAL:
TOTAL LIABILITIES AND EQUITY (CAPITAL)	8,094,721	7,765,707
Kilroy Realty L.P. [Member]
REAL ESTATE ASSETS:
Land and improvements	1,284,582	1,160,138
Buildings and improvements	5,712,448	5,207,984
Undeveloped land and construction in progress	1,827,528	2,058,510
Total real estate assets held for investment	8,824,558	8,426,632
Accumulated depreciation and amortization	(1,480,766)	(1,391,368)
Total real estate assets held for investment, net	7,343,792	7,035,264
CASH AND CASH EQUIVALENTS	52,415	51,604
RESTRICTED CASH	6,300	119,430
MARKETABLE SECURITIES (Note 11)	25,203	21,779
CURRENT RECEIVABLES, NET (Note 1)	27,563	20,176
DEFERRED RENT RECEIVABLES, NET (Note 1)	297,358	267,007
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Note 1)	203,451	197,574
RIGHT OF USE GROUND LEASE ASSETS (Notes 1 and 10)	82,647
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 3)	55,992	52,873
TOTAL ASSETS	8,094,721	7,765,707
LIABILITIES:
Secured debt, net (Notes 4 and 11)	259,455	335,531
Unsecured debt, net (Notes 4 and 11)	2,553,651	2,552,070
Unsecured line of credit (Notes 4, 11 and 16)	375,000	45,000
Accounts payable, accrued expenses and other liabilities	385,567	374,415
Ground lease liabilities (Notes 1 and 10)	87,082
Accrued distributions (Note 16)	50,800	47,559
Deferred revenue and acquisition-related intangible liabilities, net	136,266	149,646
Rents received in advance and tenant security deposits	59,997	60,225
Total liabilities	3,907,818	3,564,446
COMMITMENTS AND CONTINGENCIES
CAPITAL:
Common units, 100,972,035 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 6)	3,988,538	4,003,700
Noncontrolling interests in consolidated property partnerships and subsidiaries (Note 1)	198,365	197,561
Total capital	4,186,903	4,201,261
TOTAL LIABILITIES AND EQUITY (CAPITAL)	$ 8,094,721	$ 7,765,707