Consolidated Balance Sheets (KILROY REALTY, L.P.) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
REAL ESTATE ASSETS:
Land and improvements (Note 2)	$ 562,071		$ 537,574
Buildings and improvements (Note 2)	3,169,224		2,830,310
Undeveloped land and construction in progress (Note 2)	668,058		430,806
Total real estate held for investment	4,399,353		3,798,690
Accumulated depreciation and amortization	(725,728)		(742,503)
Total real estate assets held for investment, net ($296,656 and $101,352 of VIE, Note 1)	3,673,625		3,056,187
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 13)	166,019		84,156
CASH AND CASH EQUIVALENTS	16,113		4,777
RESTRICTED CASH	5,884		358
MARKETABLE SECURITIES (Note 12)	6,812		5,691
CURRENT RECEIVABLES, NET (Note 4)	7,113		8,395
DEFERRED RENT RECEIVABLES, NET (Note 4)	110,128		101,142
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2 and 3)	187,307	[1]	155,522
DEFERRED FINANCING COSTS, NET	18,442		18,368
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 11)	24,398		12,199
Total Assets	4,215,841		3,446,795
LIABILITIES:
Secured debt (Notes 2, 5 and 12)	520,867	[2]	351,825	[2]
Exchangeable senior notes, net (Notes 5 and 12)	162,885		306,892
Unsecured debt, net (Notes 5 and 12)	1,130,814		980,569
Unsecured line of credit (Notes 5 and 12)	27,000		182,000
Accounts payable, accrued expenses and other liabilities	127,472		81,713
Accrued distributions (Note 17)	28,845		22,692
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2 and 3)	120,407		79,781
Rents received in advance and tenant security deposits	31,728		26,917
Liabilities and deferred revenue of real estate assets held for sale (Note 13)	4,455		13,286
Total liabilities	2,154,473		2,045,675
COMMITMENTS AND CONTINGENCIES (Note 11)
7.45% SERIES A CUMULATIVE REDEEMABLE PREFERRED UNITS	0		73,638
Partners' Capital (Note 8):
TOTAL LIABILITIES, NONCONTROLLING INTEREST AND CAPITAL	4,215,841		3,446,795
Kilroy Realty, L.P. [Member]
REAL ESTATE ASSETS:
Land and improvements (Note 2)	562,071		537,574
Buildings and improvements (Note 2)	3,169,224		2,830,310
Undeveloped land and construction in progress (Note 2)	668,058		430,806
Total real estate held for investment	4,399,353		3,798,690
Accumulated depreciation and amortization	(725,728)		(742,503)
Total real estate assets held for investment, net ($296,656 and $101,352 of VIE, Note 1)	3,673,625		3,056,187
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 13)	166,019		84,156
CASH AND CASH EQUIVALENTS	16,113		4,777
RESTRICTED CASH	5,884		358
MARKETABLE SECURITIES (Note 12)	6,812		5,691
CURRENT RECEIVABLES, NET (Note 4)	7,113		8,395
DEFERRED RENT RECEIVABLES, NET (Note 4)	110,128		101,142
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2 and 3)	187,307		155,522
DEFERRED FINANCING COSTS, NET	18,442		18,368
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 11)	24,398		12,199
Total Assets	4,215,841		3,446,795
LIABILITIES:
Secured debt (Notes 2, 5 and 12)	520,867		351,825
Exchangeable senior notes, net (Notes 5 and 12)	162,885		306,892
Unsecured debt, net (Notes 5 and 12)	1,130,814		980,569
Unsecured line of credit (Notes 5 and 12)	27,000		182,000
Accounts payable, accrued expenses and other liabilities	127,472		81,713
Accrued distributions (Note 17)	28,845		22,692
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2 and 3)	120,407		79,781
Rents received in advance and tenant security deposits	31,728		26,917
Liabilities and deferred revenue of real estate assets held for sale (Note 13)	4,455		13,286
Total liabilities	2,154,473		2,045,675
COMMITMENTS AND CONTINGENCIES (Note 11)
7.45% SERIES A CUMULATIVE REDEEMABLE PREFERRED UNITS	0		73,638
Partners' Capital (Note 8):
Common units, 74,692,939 and 58,819,717 held by the general partner and 1,718,131 and 1,718,131 held by common limited partners issued and outstanding, respectively	1,866,172		1,203,259
Total Partners' Capital	2,058,583		1,324,841
Noncontrolling interest in consolidated subsidiaries	2,785		2,641
Total capital	2,061,368		1,327,482
TOTAL LIABILITIES, NONCONTROLLING INTEREST AND CAPITAL	4,215,841		3,446,795
Kilroy Realty, L.P. [Member] | Series E Cumulative Redeemable Preferred Unit [Member]
Partners' Capital (Note 8):
Cumulative Redeemable Preferred stock	0		38,425
Kilroy Realty, L.P. [Member] | Series F Cumulative Redeemable Preferred Unit [Member]
Partners' Capital (Note 8):
Cumulative Redeemable Preferred stock	0		83,157
Kilroy Realty, L.P. [Member] | Series G Cumulative Redeemable Preferred Unit [Member]
Partners' Capital (Note 8):
Cumulative Redeemable Preferred stock	96,155		0
Kilroy Realty, L.P. [Member] | Series H Cumulative Redeemable Preferred Unit [Member]
Partners' Capital (Note 8):
Cumulative Redeemable Preferred stock	$ 96,256		$ 0

[1] Balances and accumulated amortization amounts at September 30, 2012 reflect the write-off of the following fully amortized amounts at January 1, 2012: deferred leasing costs (approximately $9.5 million), above-market leases (approximately $1.6 million), in-place leases (approximately $3.7 million), and below-market leases (approximately $1.0 million).

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