Consolidated Balance Sheets (KILROY REALTY, L.P.) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
REAL ESTATE ASSETS:
Land and improvements (Note 2)	$ 637,854		$ 612,714
Buildings and improvements (Note 2)	3,631,057		3,335,026
Undeveloped land and construction in progress	747,679		809,654
Total real estate held for investment	5,016,590		4,757,394
Accumulated depreciation and amortization	(790,878)		(756,515)
Total real estate assets held for investment, net ($0 and $319,770 of VIE, Note 1)	4,225,712		4,000,879
CASH AND CASH EQUIVALENTS	135,676		16,700
RESTRICTED CASH	19,465		247,544
MARKETABLE SECURITIES (Note 11)	8,029		7,435
CURRENT RECEIVABLES, NET (Note 4)	10,666		9,220
DEFERRED RENT RECEIVABLES, NET (Note 4)	122,142		115,418
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2 and 3)	196,525	[1]	189,968
DEFERRED FINANCING COSTS, NET	20,501		18,971
PREPAID EXPENSES AND OTHER ASSETS, NET	16,571		9,949
Total Assets	4,755,287		4,616,084
LIABILITIES:
Secured debt (Notes 2, 5 and 11)	570,676	[2]	561,096	[2]
Exchangeable senior notes, net (Notes 5 and 11)	165,022		163,944
Unsecured debt, net (Notes 5 and 11)	1,430,880		1,130,895
Unsecured line of credit (Notes 5 and 11)	0		185,000
Accounts payable, accrued expenses and other liabilities	171,694		154,734
Accrued distributions (Note 14)	29,106		28,924
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2 and 3)	118,118		117,904
Rents received in advance and tenant security deposits	37,251		37,654
Total liabilities	2,522,747		2,380,151
COMMITMENTS AND CONTINGENCIES (Note 10)
Partners' Capital (Note 8):
TOTAL LIABILITIES AND CAPITAL	4,755,287		4,616,084
Kilroy Realty, L.P. [Member]
REAL ESTATE ASSETS:
Land and improvements (Note 2)	637,854		612,714
Buildings and improvements (Note 2)	3,631,057		3,335,026
Undeveloped land and construction in progress	747,679		809,654
Total real estate held for investment	5,016,590		4,757,394
Accumulated depreciation and amortization	(790,878)		(756,515)
Total real estate assets held for investment, net ($0 and $319,770 of VIE, Note 1)	4,225,712		4,000,879
CASH AND CASH EQUIVALENTS	135,676		16,700
RESTRICTED CASH	19,465		247,544
MARKETABLE SECURITIES (Note 11)	8,029		7,435
CURRENT RECEIVABLES, NET (Note 4)	10,666		9,220
DEFERRED RENT RECEIVABLES, NET (Note 4)	122,142		115,418
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2 and 3)	196,525		189,968
DEFERRED FINANCING COSTS, NET	20,501		18,971
PREPAID EXPENSES AND OTHER ASSETS, NET	16,571		9,949
Total Assets	4,755,287		4,616,084
LIABILITIES:
Secured debt (Notes 2, 5 and 11)	570,676		561,096
Exchangeable senior notes, net (Notes 5 and 11)	165,022		163,944
Unsecured debt, net (Notes 5 and 11)	1,430,880		1,130,895
Unsecured line of credit (Notes 5 and 11)	0		185,000
Accounts payable, accrued expenses and other liabilities	171,694		154,734
Accrued distributions (Note 14)	29,106		28,924
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2 and 3)	118,118		117,904
Rents received in advance and tenant security deposits	37,251		37,654
Total liabilities	2,522,747		2,380,151
COMMITMENTS AND CONTINGENCIES (Note 10)
Partners' Capital (Note 8):
Common units, 75,349,705 and 74,926,981 held by the general partner and 1,826,503 and 1,826,503 held by common limited partners issued and outstanding, respectively	2,036,781		2,040,243
Total Partners' Capital	2,229,192		2,232,654
Noncontrolling interest in consolidated subsidiaries	3,348		3,279
Total capital	2,232,540		2,235,933
TOTAL LIABILITIES AND CAPITAL	4,755,287		4,616,084
Kilroy Realty, L.P. [Member] | Series G Cumulative Redeemable Preferred Unit [Member]
Partners' Capital (Note 8):
Cumulative Redeemable Preferred stock	96,155		96,155
Kilroy Realty, L.P. [Member] | Series H Cumulative Redeemable Preferred Unit [Member]
Partners' Capital (Note 8):
Cumulative Redeemable Preferred stock	$ 96,256		$ 96,256

[1] Balances and accumulated amortization amounts at March 31, 2013 reflect the write-off of the following fully amortized amounts at January 1, 2013: deferred leasing costs (approximately $7.0 million), above-market leases (approximately $0.6 million), in-place leases (approximately $10.3 million), and below-market leases (approximately $4.4 million).

[2] Amounts reported include the amounts of unamortized debt premiums and discounts for the periods presented.