Exhibit 25.1

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM T-1

STATEMENT OF ELIGIBILITY

UNDER THE TRUST INDENTURE ACT OF 1939 OF A

CORPORATION DESIGNATED TO ACT AS TRUSTEE

Check if an Application to Determine Eligibility of

a Trustee Pursuant to Section 305(b)(2)

U.S. BANK NATIONAL ASSOCIATION

(Exact name of Trustee as specified in its charter)

31-0841368

I.R.S. Employer Identification No.

800 Nicollet Mall Minneapolis, Minnesota	55402
(Address of principal executive offices)	(Zip Code)

Paula Oswald

U.S. Bank National Association

633 W. 5^TH Street, 24^th Floor

Los Angeles, CA 90071

(213) 615-6043

(Name, address and telephone number of agent for service)

(Exact name of obligor as specified in its charter)

KILROY REALTY, L.P.

(Exact name of obligor as specified in its charter)

Delaware	95-4612685
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

12200 W. Olympic Blvd., Los Angeles, CA	90064
(Address of Principal Executive Offices)	(Zip Code)

KILROY REALTY CORPORATION

(Exact name of obligor as specified in its charter)

Maryland	95-4598246
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

12200 W. Olympic Blvd., Los Angeles, CA	90064
(Address of Principal Executive Offices)	(Zip Code)

Debt Securities

(Title of the Indenture Securities)

FORM T-1

Item 1. GENERAL INFORMATION. Furnish the following information as to the Trustee.

a) Name and address of each examining or supervising authority to which it is subject.

Comptroller of the Currency

Washington, D.C.

b) Whether it is authorized to exercise corporate trust powers.

Trustee is authorized to exercise corporate trust powers.

Item 2. AFFILIATIONS WITH OBLIGOR. If the obligor is an affiliate of the Trustee, describe each such affiliation.

None

In answering this item, the trustee has relied, in part, upon information furnished by the obligor and the underwriters, and has also examined its own books and records for the purpose of answering this item.

Items 3-15 Items 3-15 are not applicable because to the best of the Trustee’s knowledge, the obligor is not in default under any Indenture for which the Trustee acts as Trustee.

Item 16. LIST OF EXHIBITS: List below all exhibits filed as a part of this statement of eligibility and qualification.

1. A copy of the Articles of Association of the Trustee.*

2. A copy of the certificate of authority of the Trustee to commence business.*

3. A copy of the certificate of authority of the Trustee to exercise corporate trust powers.*

4. A copy of the existing bylaws of the Trustee.**

5. A copy of each Indenture referred to in Item 4. Not applicable.

6. The consent of the Trustee required by Section 321(b) of the Trust Indenture Act of 1939, attached hereto as Exhibit 6.

7. A copy of the latest report of condition of the trustee published pursuant to law or the requirements of its supervising or examining authority is annexed hereto as Exhibit 7 and made a part hereof.

* Incorporated by reference to Registration Number 333-128217.

Copies of the Articles of Association of the trustee, as now in effect, a certificate of authority to commence business and a certificate of authority to exercise corporate trust powers are on file with the Securities and Exchange Commission as Exhibits with corresponding exhibit numbers to the Form T-1 of Revlon Consumer Products Corporation, filed pursuant to Section 305(b)(2) of the Trust Indenture Act of 1939, as amended, on November 15, 2005 (Registration No. 333-128217), and are incorporated herein by reference.

** Incorporated by reference to Registration Number 333-159463.

Copies of the existing bylaws of the Trustee, amended March 4, 2009, are on file with the Securities and Exchange Commission as Exhibits with corresponding exhibit numbers to the Form T-1 of Magma Design Automation Inc. filed pursuant to Section 305(b) (2) of the Trust Indenture Act of 1939, as amended, on August 24, 2009, and are incorporated herein by reference.

NOTE

The answers to this statement insofar as such answers relate to what persons have been underwriters for any securities of the obligors within three years prior to the date of filing this statement, or what persons are owners of 10% or more of the voting securities of the obligors, or affiliates, are based upon information furnished to the Trustee by the obligors.

SIGNATURE

Pursuant to the requirements of the Trust Indenture Act of 1939, as amended, the Trustee, U.S. BANK NATIONAL ASSOCIATION, a national banking association organized and existing under the laws of the United States of America, has duly caused this statement of eligibility and qualification to be signed on its behalf by the undersigned, thereunto duly authorized, all in the City of Los Angeles, State of California on the 23rd of February, 2011.

U.S. BANK NATIONAL ASSOCIATION
By:	/s/ Paula Oswald
	Paula Oswald
	Vice President

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Exhibit 6

CONSENT

In accordance with Section 321(b) of the Trust Indenture Act of 1939, the undersigned, U.S. BANK NATIONAL ASSOCIATION hereby consents that reports of examination of the undersigned by Federal, State, Territorial or District authorities may be furnished by such authorities to the Securities and Exchange Commission upon its request therefor.

Dated: February 23, 2011

U.S. BANK NATIONAL ASSOCIATION
By:	/s/Paula Oswald
	Paula Oswald
	Vice President

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Exhibit 7

U.S. Bank National Association		FFIEC 031
Legal Title of Bank		Page RC-1
Cincinnati		14
City
OH	45202
State	Zip Code
FDIC Certificate Number: 06548

Consolidated Report of Condition for Insured Commercial

and State-Chartered Savings Banks for December 31, 2010

All schedules are to be reported in thousands of dollars. Unless otherwise indicated, report the amount outstanding as of the last business day of the quarter.

Schedule RC—Balance Sheet

	Dollar Amounts in Thousands			RCFD		Tril | Bil | Mil | Thou
ASSETS
1. Cash and balances due from depository institutions (from Schedule RC-A):
a. Noninterest-bearing balances and currency and coin (1)					0081		4,131,456	1.a
b. Interest-bearing balances (2)					0071		10,355,932	1.b
2. Securities:
a. Held-to-maturity securities (from Schedule RC-B, column A)					1754		1,469,173	2.a
b. Available-for-sale securities (from Schedule RC-B, column D)					1773		49,839,081	2.b
3. Federal funds sold and securities purchased under agreements to resell:					RCON
a. Federal funds sold in domestic offices					B987		4,252,675	3.a
					RCFD
b. Securities purchased under agreements to resell (3)					B989		0	3.b
4. Loans and lease financing receivables (from Schedule RC-C):
a. Loans and leases held for sale					5369		8,370,473	4.a
b. Loans and leases, net of unearned income		B528	188,524,308					4.b
c. LESS: Allowance for loan and lease losses		3123	5,075,663					4.c
d. Loans and leases, net of unearned income and allowance (item 4.b minus 4.c)					B529		183,448,645	4.d
5. Trading assets (from Schedule RC-D)					3545		1,231,511	5
6. Premises and fixed assets (including capitalized leases)					2145		2,462,972	6
7. Other real estate owned (from Schedule RC-M)					2150		1,533,586	7
8. Investments in unconsolidated subsidiaries and associated companies					2130		54,474	8
9. Direct and indirect investments in real estate ventures					3656		0	9
10. Intangible assets:
a. Goodwill					3163		8,941,257	10.a
b. Other intangible assets (from Schedule RC-M)					0426		4,113,910	10.b
11. Other assets (from Schedule RC-F)					2160		22,054,399	11
12. Total assets (sum of items 1 through 11)					2170		302,259,544	12

(1) Includes cash items in process of collection and unposted debits.

(2) Includes time certificates of deposit not held for trading.

(3) Includes all securities resale agreements in domestic and foreign offices, regardless of maturity.

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U.S. Bank National Association	FFIEC 031
Legal Title of Bank	Page RC-2
FDIC Certificate Number: 06548	15

Schedule RC—Continued

	Dollar Amounts in Thousands				Tril | Bil | Mil | Thou
LIABILITIES
13. Deposits:				RCON
a. In domestic offices (sum of totals of columns A and C from Schedule RC-E, part I)				2200		187,595,615		13.a
(1) Noninterest-bearing (1)		6631	45,785,953					13.a.1
(2) Interest-bearing		6636	141,809,662					13.a.2
b. In foreign offices, Edge and Agreement subsidiaries, and IBFs				RCFN
(from Schedule RC-E, part II)				2200		23,821,574		13.b
(1) Noninterest-bearing		6631	0					13.b.1
(2) Interest-bearing		6636	23,821,574					13.b.2
14. Federal funds purchased and securities sold under agreements to repurchase:				RCON
a. Federal funds purchased in domestic offices (2)				B993		776,158		14.a
				RCFD
b. Securities sold under agreements to repurchase (3)				B995		9,175,352		14.b
15. Training liabilities (from Schedule RC-D)				3548		524,005		15
16. Other borrowed money (includes mortgage indebtedness and obligations under capitalized leases) (from Schedule RC-M)				3190		33,939,855		16
17. and 18. Not applicable
19. Subordinated notes and debentures (4)				3200		7,760,721		19
20. Other liabilities (from Schedule RC-G)				2930		7,839,191		20
21. Total liabilities (sum of items 13 through 20)				2948		271,432,471		21
22. Not applicable
EQUITY CAPITAL
Bank Equity Capital
23. Perpetual preferred stock and related surplus				3838		0		23
24. Common stock				3230		18,200		24
25. Surplus (excludes all surplus related to preferred stock)				3839		14,136,872		25
26. a. Retained earnings				3632		16,237,551		26.a
b. Accumulated other comprehensive income (5)				B530		(1,302,030	)	26.b
c. Other equity capital components (6)				A130		0		26.c
27. a. Total bank equity capital (sum of items 23 through 26.c)				3210		29,090,593		27.a
b. Noncontrolling (minority) interests in consolidated subsidiaries				3000		1,736,480		27.b
28. Total equity capital (sum of items 27.a and 27.b)				G105		30,827,673		28
29. Total liabilities and equity capital (sum of items 21 and 28)				3300		302,259,544		29
Memoranda
To be reported with the March Report of Condition.
1. Indicate in the box at the right the number of the statement below that best describes the most comprehensive level of auditing work performed for the bank by independent external auditors as of any date during 2009				RCFD 6724		Number N/A		M.1

1 = Independent audit of the bank conducted in accordance with generally accepted auditing standards by a certified public accounting firm which submits a report on the bank 2 = Independent audit of the bank’s parent holding company conducted in accordance with generally accepted auditing standards by a certified public accounting firm which submits a report on the consolidated holding company (but not on the bank separately) 3 = Attestation on bank management’s assertion on the effectiveness of the bank’s internal control over financial reporting by a certified public accounting firm. 4 = Directors’ examination of the bank conducted in accordance with generally accepted auditing standards by a certified public accounting firm (may be required by state chartering authority) 5 = Directors’ examination of the bank performed by other external auditors (may be required by state chartering authority) 6 = Review of the bank’s financial statements by external auditors 7 = Compilation of the bank’s financial statements by external auditors 8 = Other audit procedures (excluding tax preparation work) 9 = No external audit work

To be reported with the March Report of Condition.	RCON	MM / DD	M.2
2. Bank’s fiscal year-end date	8678	N/A

(1) Includes total demand deposits and noninterest-bearing time and savings deposits.

(2) Report overnight Federal Home Loan Bank advances in Schedule RC, item 16, “Other borrowed money.”

(3) Includes all securities repurchase agreements in domestic and foreign offices, regardless of maturity.

(4) Includes limited-life preferred stock and related surplus.

(5) Includes net unrealized holding gains (losses) on available-for-sale securities, accumulated net gains (losses) on cash flow hedges, cumulative foreign currency translation adjustments, and minimum pension liability adjustments.

(6) Includes treasury stock and unearned Employee Stock Ownership Plan shares.

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