American Assets Trust (AAT) 10-Q 2 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	2-May-14
Document and Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Trading Symbol	'AAT	'
Entity Registrant Name	'AMERICAN ASSETS TRUST, INC.	'
Entity Central Index Key	'0001500217	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	41,935,138

Consolidated_Balance_Sheets_Un

Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Operating real estate	$1,924,855	$1,919,015
Construction in progress	89,991	67,389
Held for development	9,028	9,013
Total Real estate, at cost	2,023,874	1,995,417
Accumulated depreciation	-330,945	-318,581
Net real estate	1,692,929	1,676,836
Cash and cash equivalents	79,486	48,987
Restricted cash	10,568	9,124
Accounts receivable, net	6,277	7,295
Deferred rent receivables, net	33,372	32,531
Other assets, net	56,326	57,670
TOTAL ASSETS	1,878,958	1,832,443
LIABILITIES AND EQUITY	'	'
Secured notes payable	952,498	952,174
Term loan	100,000	0
Line of credit	0	93,000
Accounts payable and accrued expenses	40,248	37,063
Security deposits payable	5,222	5,163
Other liabilities and deferred credits	58,514	58,465
Total liabilities	1,156,482	1,145,865
Commitments and contingencies (Note 9)	'	'
American Assets Trust, Inc. stockholders’ equity	'	'
Common stock, $0.01 par value, 490,000,000 shares authorized, 41,935,138 and 40,512,563 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	419	405
Additional paid-in capital	735,175	692,196
Accumulated dividends in excess of net income	-48,619	-44,090
Accumulated other comprehensive loss	-521	0
Total American Assets Trust, Inc. stockholders’ equity	686,454	648,511
Noncontrolling interests	36,022	38,067
Total equity	722,476	686,578
TOTAL LIABILITIES AND EQUITY	$1,878,958	$1,832,443

Consolidated_Balance_Sheets_Un1

Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	490,000,000	490,000,000
Common stock, shares outstanding	41,935,138	405,812,563

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
REVENUE:	'	'
Rental income	$60,482	$59,222
Other property income	3,471	2,958
Total revenue	63,953	62,180
EXPENSES:	'	'
Rental expenses	16,620	16,286
Real estate taxes	6,026	4,800
General and administrative	4,612	4,201
Depreciation and amortization	16,341	17,013
Total operating expenses	43,599	42,300
OPERATING INCOME	20,354	19,880
Interest expense	-13,632	-14,736
Other income (expense), net	-64	-279
NET INCOME	6,658	4,865
Net income attributable to restricted shares	-70	-132
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	-1,986	-1,495
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	4,602	3,238
EARNINGS PER COMMON SHARE, BASIC	'	'
Earnings per common share, basic	$0.11	$0.08
Weighted average shares of common stock outstanding-basic	40,582,792	39,033,013
EARNINGS PER COMMON SHARE, DILUTED	'	'
Earnings per common share, diluted	$0.11	$0.08
Weighted average shares of common stock outstanding-diluted	58,492,473	57,056,448
Dividends declared per common share	$0.22	$0.21
COMPREHENSIVE INCOME	'	'
Net income	6,658	4,865
Other comprehensive loss - unrealized loss on swap derivative during the period	-746	0
Comprehensive income	5,912	4,865
Comprehensive income attributable to non-controlling interest	-1,761	-1,495
Comprehensive income attributable to American Assets Trust, Inc.	$4,151	$3,370

Consolidated_Statement_of_Equi

Consolidated Statement of Equity (Unaudited) (USD $)	Total	Common Shares	Additional Paid-in Capital	Accumulated Dividends in Excess of Net Income	Accumulated Other Comprehensive Loss	Noncontrolling Interests - Unitholders in the Operating Partnership
In Thousands, except Share data, unless otherwise specified
Beginning Balance at Dec. 31, 2013	$686,578	$405	$692,196	($44,090)	$0	$38,067
Beginning Balance (in shares) at Dec. 31, 2013	405,812,563	40,512,563	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income	6,658	'	'	4,672	'	1,986
Common shares issued (in shares)	'	1,435,215	'	'	'	'
Common shares issued	46,926	14	46,912	'	'	'
Issuance of restricted stock (in shares)	'	112,119	'	'	'	'
Issuance of restricted stock	0	1	-1	'	'	'
Conversion of operating partnership units (in shares)	11,852	11,852	'	'	'	'
Conversion of operating partnership units	0	'	-133	'	'	133
Dividends declared and paid	-13,140	'	'	-9,201	'	-3,939
Stock-based compensation	519	'	519	'	'	'
Shares withheld for employee taxes (in shares)	'	-136,611	'	'	'	'
Shares withheld for employee taxes	-4,319	-1	-4,318	'	'	'
Other comprehensive loss - change in value of interest rate swap	-746	'	'	'	-521	-225
Ending Balance at Mar. 31, 2014	$722,476	$419	$735,175	($48,619)	($521)	$36,022
Ending Balance (in shares) at Mar. 31, 2014	41,935,138	41,935,138	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES	'	'
Net income	$6,658	$4,865
Adjustments to reconcile income from operations to net cash provided by operating activities:	'	'
Deferred rent revenue and amortization of lease intangibles	-1,545	-1,163
Depreciation and amortization	16,341	17,013
Amortization of debt issuance costs and debt fair value adjustments	1,015	983
Stock-based compensation expense	519	676
Other, net	-362	-1,202
Changes in operating assets and liabilities	'	'
Change in restricted cash	-1,141	-500
Change in accounts receivable	1,022	-1,198
Change in other assets	-392	-216
Change in accounts payable and accrued expenses	4,705	5,956
Change in security deposits payable	58	211
Change in other liabilities and deferred credits	1,115	247
Net cash provided by operating activities	27,993	25,672
INVESTING ACTIVITIES	'	'
Capital expenditures	-30,300	-9,902
Change in restricted cash	-303	518
Leasing commissions	-996	-338
Net cash used in investing activities	-31,599	-9,722
FINANCING ACTIVITIES	'	'
Change in restricted cash	0	1,400
Repayment of secured notes payable	-405	-943
Proceeds from term loan	100,000	0
Repayment of line of credit	-93,000	0
Debt issuance costs	-1,957	0
Proceeds from issuance of common stock, net	46,926	0
Dividends paid to common stock and unitholders	-13,140	-12,114
Shares withheld for employee taxes	-4,319	0
Net cash (used in) provided by financing activities	34,105	-14,457
Net increase (decrease) in cash and cash equivalents	30,499	1,493
Cash and cash equivalents, beginning of period	48,987	42,479
Cash and cash equivalents, end of period	$79,486	$43,972

SUMMARY_OF_SIGNIFICANT_ACCOUNT

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Business and Organization
	American Assets Trust, Inc. (which may be referred to in these financial statements as the “Company,” “we,” “us,” or “our”) is a Maryland corporation formed on July 16, 2010 that did not have any operating activity until the consummation of our initial public offering on January 19, 2011. The Company is the sole general partner of American Assets Trust, L.P., a Maryland limited partnership formed on July 16, 2010 (the “Operating Partnership”). The Company’s operations are carried on through our Operating Partnership and its subsidiaries, including our taxable real estate investment trust ("REIT") subsidiary ("TRS"). Since the formation of our Operating Partnership, the Company has controlled our Operating Partnership as its general partner and has consolidated its assets, liabilities and results of operations.
	We are a full service vertically integrated and self-administered REIT with approximately 120 employees providing substantial in-house expertise in asset management, property management, property development, leasing, tenant improvement construction, acquisitions, repositioning, redevelopment and financing.
	As of March 31, 2014, we owned or had a controlling interest in 23 office, retail, multifamily and mixed-use operating properties, the operations of which we consolidate. Additionally, as of March 31, 2014, we owned land at five of our properties that we classify as held for development and/or construction in progress. A summary of the properties owned by us is as follows:
	Retail
	Carmel Country Plaza	Del Monte Center
	Carmel Mountain Plaza	Geary Marketplace
	South Bay Marketplace	The Shops at Kalakaua
	Rancho Carmel Plaza	Waikele Center
	Lomas Santa Fe Plaza	Alamo Quarry Market
	Solana Beach Towne Centre
	Office
	Torrey Reserve Campus	Lloyd District Portfolio
	Solana Beach Corporate Centre	City Center Bellevue
	The Landmark at One Market
	One Beach Street
	First & Main
	Multifamily
	Loma Palisades
	Imperial Beach Gardens
	Mariner's Point
	Santa Fe Park RV Resort
	Mixed-Use
	Waikiki Beach Walk Retail and Embassy Suites™ Hotel
	Held for Development and Construction in Progress
	Solana Beach Corporate Centre – Land
	Solana Beach – Highway 101 – Land
	Sorrento Pointe – Land
	Torrey Reserve – Land
	Lloyd District Portfolio – Land
	Basis of Presentation
	Our consolidated financial statements include the accounts of the Company, our Operating Partnership and our subsidiaries. The equity interests of other investors in our Operating Partnership are reflected as noncontrolling interests.
	All significant intercompany transactions and balances are eliminated in consolidation.
	The accompanying consolidated financial statements of the Company have been prepared in accordance with the rules applicable to Form 10-Q and include all information and footnotes required for interim financial statement presentation, but do not include all disclosures required under accounting principles generally accepted in the United States (“GAAP”) for annual financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments, except as otherwise noted) considered necessary for a fair presentation have been included. These financial statements should be read in conjunction with the audited consolidated financial statements and notes therein included in the Company's annual report on Form 10-K for the year ended December 31, 2013.
	The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and revenues and expenses. These estimates are prepared using our best judgment, after considering past, current and expected events and economic conditions. Actual results could differ from these estimates.
	Any reference to the number of properties and square footage are unaudited and outside the scope of our independent registered public accounting firm’s review of our financial statements in accordance with the standards of the United States Public Company Accounting Oversight Board.
	Consolidated Statements of Cash Flows—Supplemental Disclosures
	The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows (in thousands):
		Three Months Ended March 31,
		2014			2013
	Supplemental cash flow information
	Total interest costs incurred	$	14,467		$	15,093
	Interest capitalized	$	835		$	357
	Interest expense	$	13,632		$	14,736
	Cash paid for interest, net of amounts capitalized	$	12,724		$	13,128
	Cash paid for income taxes	$	—		$	—
	Supplemental schedule of noncash investing and financing activities
	Accounts payable and accrued liabilities for construction in progress	$	(890	)	$	556
	Accrued leasing commissions	$	(630	)	$	689
	Significant Accounting Policies
	We describe our significant accounting policies in Note 1 to the consolidated financial statements in Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2013. There have been no changes to our significant accounting policies during the three months ended March 31, 2014.
	Concurrent with the closing of our amended and restated credit facility on January 9, 2014 (Note 6), we entered into an interest rate swap agreement with a notional amount of $100.0 million. The interest rate swap is intended to fix the variable portion of our $100.0 million term loan at approximately 3.08% from January 9, 2014 through January 19, 2019. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for our making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.
	We assess effectiveness of our cash flow hedges both at inception and on an ongoing basis. The effective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recorded in accumulated other comprehensive income/loss and is subsequently reclassified into interest expense as interest is incurred on the related variable rate debt. Our cash flow hedges become ineffective if critical terms of the hedging instrument and the debt instrument do not perfectly match such as notional amounts, settlement dates, reset dates, calculation period and LIBOR rate. In addition, we evaluate the default risk of the counterparty by monitoring the credit-worthiness of the counterparty. When ineffectiveness exists, the ineffective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recognized in earnings in the period affected. Hedge ineffectiveness has not impacted earnings as of March 31, 2014, and we do not anticipate it will have a significant effect in the future.
	Segment Information
	Segment information is prepared on the same basis that our management reviews information for operational decision-making purposes. We operate in four business segments: the acquisition, redevelopment, ownership and management of retail real estate, office real estate, multifamily real estate and mixed-use real estate. The products for our retail segment primarily include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our office segment primarily include rental of office space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our multifamily segment include rental of apartments and other tenant services. The products of our mixed-use segment include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental and operation of a 369-room all-suite hotel.
	Recent Accounting Pronouncements
	In February 2013, the Financial Accounting Standards Board (the "FASB") issued ASU 2013-2, Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income. ASU 2013-2 requires entities to disclose certain information relating to amounts reclassified out of accumulated other comprehensive income. This pronouncement became effective for us in the first quarter of 2013 and did not have a significant impact on our consolidated financial statements.
	In April 2014, the FASB issued ASU-2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 revises the definition of a discontinued operation to a disposal, sale or held-for-sale component or group of components that represents a strategic shift that will have a major effect on an entity's operations and financial results. This pronouncement is effective in 2015, however, calendar year-end companies may early adopt during the first quarter of 2014. We have chosen to early adopt this pronouncement and it became effective for us in the first quarter of 2014. This pronouncement did not have a significant impact on our consolidated financial statements.

ACQUIRED_INPLACE_LEASES_AND_AB

ACQUIRED IN-PLACE LEASES AND ABOVE/BELOW MARKET LEASES	3 Months Ended
	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
ACQUIRED IN-PLACE LEASES AND ABOVE/BELOW MARKET LEASES	'
	ACQUIRED IN-PLACE LEASES AND ABOVE/BELOW MARKET LEASES
	The following summarizes our acquired lease intangibles and leasing costs, which are included in other assets and other liabilities and deferred credits, as of March 31, 2014 and December 31, 2013 (in thousands):
		March 31, 2014			December 31, 2013
	In-place leases	$	62,734		$	62,813
	Accumulated amortization	(39,882		)	(38,279		)
	Above market leases	28,262			28,279
	Accumulated amortization	(21,570		)	(20,880		)
	Acquired lease intangible assets, net	$	29,544		$	31,933
	Below market leases	$	76,502		$	76,502
	Accumulated accretion	(29,887		)	(28,592		)
	Acquired lease intangible liabilities, net	$	46,615		$	47,910

FAIR_VALUE_OF_FINANCIAL_INSTRU

FAIR VALUE OF FINANCIAL INSTRUMENTS	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
FAIR VALUE OF FINANCIAL INSTRUMENTS	'
	FAIR VALUE OF FINANCIAL INSTRUMENTS
	A fair value measurement is based on the assumptions that market participants would use in pricing an asset or liability. The hierarchy for inputs used in measuring fair value is as follows:
	1	Level 1 Inputs—quoted prices in active markets for identical assets or liabilities
	2	Level 2 Inputs—observable inputs other than quoted prices in active markets for identical assets and liabilities
	3	Level 3 Inputs—unobservable inputs
	Except as disclosed below, the carrying amounts of our financial instruments approximate their fair value. The financial liability whose fair value we measure on a recurring basis using Level 2 inputs is our deferred compensation liability included in other liabilities and deferred credits on the consolidated balance sheet. We measure the fair value of this liability based on prices provided by independent market participants that are based on observable inputs using market-based valuation techniques.
	In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement.
	The fair values of the interest rate swap agreements are based on the estimated amounts we would receive or pay to terminate the contracts at the reporting date and are determined using interest rate pricing models and interest rate related observable inputs. The fair value of our swap at March 31, 2014 was a liability of $0.7 million and is included in "other liabilities and deferred credits" on our consolidated balance sheets. For the three months ended March 31, 2014, the change in valuation on our interest rate swaps was a decrease of $0.7 million. The effective portion of changes in the fair value of the derivatives that are designated as cash flow hedges are being recorded in accumulated other comprehensive loss and will be subsequently reclassified into earnings during the period in which the hedged forecasted transaction affects earnings.
	The Company incorporates credit valuation adjustments to appropriately reflect both its own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. In adjusting the fair value of its derivative contract for the effect of non-performance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.
	Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2014 the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative position and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuation in its entirety is classified in Level 2 of the fair value hierarchy.
	A summary of our financial liabilities that are measured at fair value on a recurring basis, by level within the fair value hierarchy is as follows (in thousands):
		March 31, 2014											December 31, 2013
		Level 1		Level 2			Level 3			Total			Level 1		Level 2		Level 3		Total
	Deferred compensation liability	$	—	$	821		$	—		$	821		$	—	$	769	$	—	$	769
	Interest rate swap	$	—	$	746		$	—		$	746		$	—	$	—	$	—	$	—
	The fair value of our secured notes payable is sensitive to fluctuations in interest rates. Discounted cash flow analysis using observable market interest rates (Level 2) is generally used to estimate the fair value of our secured notes payable, using rates ranging from 3.5% to 5.2%.
	Considerable judgment is necessary to estimate the fair value of financial instruments. The estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized upon disposition of the financial instruments. A summary of the carrying amount and fair value of our secured financial instruments, all of which are based on Level 2 inputs, is as follows (in thousands):
		March 31, 2014							December 31, 2013
		Carrying Value			Fair Value				Carrying Value			Fair Value
	Secured notes payable	$	952,498		$	993,568			$	952,174		$	990,296
	Term loan	$	100,000		$	100,000			$	—		$	—
	Line of credit	$	—		$	—			$	93,000		$	93,000

OTHER_ASSETS

OTHER ASSETS	3 Months Ended
	Mar. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'
OTHER ASSETS	'
	OTHER ASSETS
	Other assets consist of the following (in thousands):
		March 31, 2014		December 31, 2013
	Leasing commissions, net of accumulated amortization of $20,523 and $19,606 respectively	$	17,152	$	18,071
	Acquired above market leases, net	6,692		7,399
	Acquired in-place leases, net	22,852		24,534
	Lease incentives, net of accumulated amortization of $2,683 and $2,590, respectively	1,017		1,110
	Other intangible assets, net of accumulated amortization of $1,600 and $1,554, respectively	598		655
	Debt issuance costs, net of accumulated amortization of $3,272 and $2,985, respectively	4,302		2,632
	Prepaid expenses and other	3,713		3,269
	Total other assets	$	56,326	$	57,670

OTHER_LIABILITIES_AND_DEFERRED

OTHER LIABILITIES AND DEFERRED CREDITS	3 Months Ended
	Mar. 31, 2014
Other Liabilities Disclosure [Abstract]	'
OTHER LIABILITIES AND DEFERRED CREDITS	'
	OTHER LIABILITIES AND DEFERRED CREDITS
	Other liabilities and deferred credits consist of the following (in thousands):
		March 31, 2014		December 31, 2013
	Acquired below market leases, net	$	46,615	$	47,910
	Prepaid rent and deferred revenue	8,209		7,506
	Deferred rent expense and lease intangible	773		829
	Deferred compensation	821		769
	Deferred tax liability	233		233
	Straight-line rent liability	1,020		1,145
	Interest rate swap liability	746		—
	Other liabilities	97		73
	Total other liabilities and deferred credits	$	58,514	$	58,465
	Straight-line rent liability relates to leases which have rental payments that decrease over time or one-time upfront payments for which the rental revenue is deferred and recognized on a straight-line basis.

DEBT

DEBT	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
DEBT	'
	DEBT
	The following is a summary of our total secured notes payable outstanding as of March 31, 2014 and December 31, 2013 (in thousands):
		Principal Balance as of						Stated Interest		Stated Maturity Date
								Rate as of
	Description of Debt	March 31, 2014			December 31, 2013			31-Mar-14
	Waikele Center (1)	140,700			140,700			5.15	%	November 1, 2014
	The Shops at Kalakaua (1)	19,000			19,000			5.45	%	May 1, 2015
	The Landmark at One Market (1)(2)	133,000			133,000			5.61	%	July 5, 2015
	Del Monte Center (1)	82,300			82,300			4.93	%	July 8, 2015
	First & Main (1)	84,500			84,500			3.97	%	July 1, 2016
	Imperial Beach Gardens (1)	20,000			20,000			6.16	%	September 1, 2016
	Mariner’s Point (1)	7,700			7,700			6.09	%	September 1, 2016
	South Bay Marketplace (1)	23,000			23,000			5.48	%	February 10, 2017
	Waikiki Beach Walk—Retail (1)	130,310			130,310			5.39	%	July 1, 2017
	Solana Beach Corporate Centre III-IV (3)	36,691			36,804			6.39	%	August 1, 2017
	Loma Palisades (1)	73,744			73,744			6.09	%	July 1, 2018
	One Beach Street (1)	21,900			21,900			3.94	%	April 1, 2019
	Torrey Reserve—North Court (3)	21,304			21,377			7.22	%	June 1, 2019
	Torrey Reserve—VCI, VCII, VCIII (3)	7,175			7,200			6.36	%	June 1, 2020
	Solana Beach Corporate Centre I-II (3)	11,430			11,475			5.91	%	June 1, 2020
	Solana Beach Towne Centre (3)	38,101			38,249			5.91	%	June 1, 2020
	City Center Bellevue (1)	111,000			111,000			3.98	%	November 1, 2022
		961,855			962,259
	Unamortized fair value adjustment	(9,357		)	(10,085		)
	Total Secured Notes Payable Outstanding	$	952,498		$	952,174
	-1	Interest only.
	-2	Maturity Date is the earlier of the loan maturity date under the loan agreement, or the “Anticipated Repayment Date” as specifically defined in the loan agreement, which is the date after which substantial economic penalties apply if the loan has not been paid off.
	-3	Principal payments based on a 30-year amortization schedule.
	Certain loans require us to comply with various financial covenants. As of March 31, 2014, we were in compliance with these financial covenants.
	Credit Facility
	On January 9, 2014, we entered into an amended and restated credit agreement (the "Amended and Restated Credit Facility") which amended and restated the then in-place credit facility. The Amended and Restated Credit Facility provides for aggregate, unsecured borrowing of $350 million, consisting of a revolving line of credit of $250 million (the "Revolver Loan") and a term loan of $100 million (the "Term Loan"). The Amended and Restated Credit Facility has an accordion feature that may allow us to increase the availability thereunder up to an additional $250 million, subject to meeting specified requirements and obtaining additional commitments from lenders.
	Borrowings under the Amended and Restated Credit Facility initially bear interest at floating rates equal to, at our option, either (1) LIBOR, plus a spread which ranges from (a) 1.35%-1.95% (with respect to the Revolver Loan) and (b) 1.30% to 1.90% (with respect to the Term Loan), in each case based on our consolidated leverage ratio, or (2) a base rate equal to the highest of (a) the prime rate, (b) the federal funds rate plus 50 bps or (c) the Eurodollar rate plus 100 bps, plus a spread which ranges from (i) 0.35%-0.95% (with respect to the Revolver Loan) and (ii) 0.30% to 0.90% (with respect to the Term Loan), in each case based on our consolidated leverage ratio. If we obtain an investment-grade debt rating, under the terms set forth in the Amended and Restated Credit Facility, the spreads will further improve.
	The Revolver Loan initially matures on January 9, 2018, subject to our option to extend the Revolver Loan up to two times, with each such extension for a six-month period. The Term Loan initially matures on January 9, 2016, subject to our option to extend the Term Loan up to three times, with each such extension for a 12-month period. The foregoing extension options are exercisable by us subject to the satisfaction of certain conditions.
	Concurrent with the closing of the Amended and Restated Credit Facility, we drew down on the entirety of the $100 million Term Loan and entered into an interest rate swap agreement that is intended to fix the interest rate associated with the Term Loan at approximately 3.08% through its maturity date and extension options, subject to adjustments based on our consolidated leverage ratio.
	Additionally, the Amended and Restated Credit Facility includes a number of customary financial covenants, including:
	•	A maximum leverage ratio (defined as total indebtedness net of certain cash and cash equivalents to total asset value) of 60%, and during any material acquisition period the maximum leverage ratio allowable is 65%,
	•	A maximum secured leverage ratio (defined as total secured debt to secured total asset value) of 45% at any time prior to December 31, 2015, and 40% thereafter, during a material acquisition period the maximum secured leverage ratio is increased to 50% at any time prior to December 31, 2015 and 45% thereafter,
	•	A minimum fixed charge coverage ratio (defined as consolidated earnings before interest, taxes, depreciation and amortization to consolidated fixed charges) of 1.50x,
	•	A minimum unsecured interest coverage ratio of 1.75x,
	•	A maximum unsecured leverage ratio of 60%, and during any material acquisition period the maximum unsecured leverage ratio allowable is 65%,
	•	A minimum tangible net worth of $721.16 million, and 75% of the net proceeds of any additional equity issuances (other than additional equity issuances in connection with any dividend reinvestment program), and
	•	Recourse indebtedness at any time cannot exceed 15% of total asset value.
	The Amended and Restated Credit Facility provides that our annual distributions may not exceed the greater of (1) 95% of our funds from operations or (2) the amount required for us to (a) qualify and maintain our real estate investment trust ("REIT") status and (b) avoid the payment of federal or state income or excise tax. If certain events of default exist or would result from a distribution, we may be precluded from making distributions other than those necessary to qualify and maintain our status as a REIT.
	As of March 31, 2014, we were in compliance with the Amended and Restated Credit Facility financial covenants.

EQUITY

EQUITY	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
EQUITY	'
	EQUITY
	Stockholders' Equity
	On May 6, 2013, we entered into an at-the-market (“ATM”) equity program with four sales agents in which we may, from time to time, offer and sell shares of our common stock having an aggregate offering price of up to $150.0 million. The sales of shares of our common stock made through the ATM equity program are made in "at-the-market" offerings as defined in Rule 415 of the Securities Act of 1933, as amended. For the three months ended March 31, 2014, we issued 1,435,215 shares of common stock through the ATM equity program at a weighted average price per share of $33.06 for gross proceeds of $47.4 million and paid $0.4 million in sales agent compensation and $0.1 million in additional offering expenses related to the sales of these shares of common stock. We intend to use the net proceeds from the ATM equity program to fund our development or redevelopment activities, repay amounts outstanding from time to time under our revolving credit facility or other debt financing obligations, fund potential acquisition opportunities and/or for general corporate purposes. As of March 31, 2014, we had the capacity to issue up to an additional $76.6 million in shares of our common stock under our ATM equity program. Actual future sales will depend on a variety of factors including, but not limited to, market conditions, the trading price of our common stock and our capital needs. We have no obligation to sell the remaining shares available for sale under the ATM equity program.
	Noncontrolling Interests
	Noncontrolling interests in our Operating Partnership are interests in the Operating Partnership that are not owned by us. Noncontrolling interests consisted of 17,905,257 common units (the “noncontrolling common units”), and represented approximately 30.1% of the ownership interests in our Operating Partnership at March 31, 2014. Common units and shares of our common stock have essentially the same economic characteristics in that common units and shares of our common stock share equally in the total net income or loss distributions of our Operating Partnership. Investors who own common units have the right to cause our Operating Partnership to redeem any or all of their common units for cash equal to the then-current market value of one share of our common stock, or, at our election, shares of our common stock on a one-for-one basis.
	During the three months ended March 31, 2014, approximately 11,852 common units were converted into shares of our common stock.
	Dividends
	The following table lists the dividends declared and paid on our shares of common stock and noncontrolling common units during the three months ended March 31, 2014:
	Period		Amount  per				Period Covered		Dividend Paid Date
			Share/Unit
	First Quarter 2014		$	0.22			January 1, 2014 to March 31, 2014		March 28, 2014
	Taxability of Dividends
	Earnings and profits, which determine the taxability of distributions to stockholders and holders of common units, may differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of revenue recognition and compensation expense and in the basis of depreciable assets and estimated useful lives used to compute depreciation.
	Stock-Based Compensation
	We follow the FASB guidance related to stock compensation which establishes financial accounting and reporting standards for stock-based employee compensation plans, including all arrangements by which employees receive shares of stock or other equity instruments of the employer, or the employer incurs liabilities to employees in amounts based on the price of the employer's stock.  The guidance also defines a fair value-based method of accounting for an employee stock option or similar equity instrument.
	During the three months ended March 31, 2014, we awarded 112,119 shares of restricted common stock pursuant to our 2011 Equity Incentive Award Plan (the “2011 Plan”), which are subject to performance-based vesting. Up to one-third of the shares of restricted stock may vest on November 30, 2014, 2015 and 2016 based upon pre-defined market specific performance criteria.
	For the performance-based stock awards, the fair value of the awards was estimated using a Monte Carlo Simulation model. Our stock price, along with the stock prices of a group of peer REITs, is assumed to follow the Multivariate Geometric Brownian Motion Process. Multivariate Geometric Brownian Motion is a common assumption when modeling in financial markets, as it allows the modeled quantity (in this case, the stock price) to vary randomly from its current value and take any value greater than zero. The volatilities of the returns on the stock price of the Company and the group of REITs were estimated based on a three year look-back period. The expected growth rate of the stock prices over the “derived service period” of the employee is determined with consideration of the risk free rate as of the grant date.
	The following table summarizes the activity of restricted stock awards during the three months ended March 31, 2014:
		Units			Weighted Average Grant Date Fair Value
	Nonvested at January 1, 2014	629,058			$	15.58
	Granted	112,119			29.96
	Vested	(310,194	)		15.42
	Forfeited	—			—
	Nonvested at March 31, 2014	430,983			$	19.44
	We recognize noncash compensation expense ratably over the vesting period, and accordingly, we recognized $0.5 million and $0.7 million, respectively, in noncash compensation expense for the three months ended March 31, 2014 and 2013, which is included in general and administrative expense on the consolidated statements of comprehensive income. Unrecognized compensation expense was $4.4 million at March 31, 2014.
	Earnings Per Share
	We have calculated earnings per share (“EPS”) under the two-class method. The two-class method is an earnings allocation methodology whereby EPS for each class of common stock and participating security is calculated according to dividends declared and participation rights in undistributed earnings. For the three months ended March 31, 2014 and 2013, we had a weighted average of approximately 406,856 and 631,199, unvested shares outstanding, respectively, which are considered participating securities. Therefore, we have allocated our earnings for basic and diluted EPS between common shares and unvested shares as these unvested shares have nonforfeitable dividend equivalent rights.
	Diluted EPS is calculated by dividing the net income applicable to common stockholders for the period by the weighted average number of common and dilutive instruments outstanding during the period using the treasury stock method. For the three months ended March 31, 2014 and 2013, diluted shares exclude incentive restricted stock as these awards are considered contingently issuable. Additionally, the unvested restricted stock awards subject to time vesting are anti-dilutive for all periods presented, and accordingly, have been excluded from the weighted average common shares used to compute diluted EPS.
	The computation of basic and diluted EPS is presented below (dollars in thousands, except share and per share amounts):
		Three Months Ended March 31,
		2014				2013
	NUMERATOR
	Income from operations	$	6,658			$	4,865
	Less: Net income attributable to restricted shares	(70		)		(132		)
	Less: Income from operations attributable to unitholders in the Operating Partnership	(1,986		)		(1,495		)
	Net income attributable to common stockholders—basic	$	4,602			$	3,238
	Income from operations attributable to American Assets Trust, Inc. common stockholders—basic	$	4,602			$	3,238
	Plus: Income from operations attributable to unitholders in the Operating Partnership	1,986				1,495
	Net income attributable to common stockholders—diluted	$	6,588			$	4,733
	DENOMINATOR
	Weighted average common shares outstanding—basic	40,582,792				39,033,013
	Effect of dilutive securities—conversion of Operating Partnership units	17,909,681				18,023,435
	Weighted average common shares outstanding—diluted	58,492,473				57,056,448
	Earnings per common share, basic	$	0.11			$	0.08
	Earnings per common share, diluted	$	0.11			$	0.08

INCOME_TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	INCOME TAXES
	We elected to be taxed as a REIT and operate in a manner that allows us to qualify as a REIT for federal income tax purposes commencing with our initial taxable year. As a REIT, we are generally not subject to corporate level income tax on the earnings distributed currently to our stockholders that we derive from our REIT qualifying activities. Taxable income from non-REIT activities managed through our TRS is subject to federal and state income taxes.
	We lease our hotel property to a wholly owned TRS that is subject to federal and state income taxes. We account for income taxes using the asset and liability method, under which deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between GAAP carrying amounts and their respective tax bases. Additionally, we classify certain state taxes as income taxes for financial reporting purposes in accordance with ASC Topic 740, Income Taxes.
	A deferred tax liability of $0.2 million as of March 31, 2014 and December 31, 2013 is included in our consolidated balance sheets in relation to real estate asset basis differences of property subject to the Texas margin tax and certain prepaid expenses of our TRS.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	COMMITMENTS AND CONTINGENCIES
	Legal
	We are sometimes involved in various disputes, lawsuits, warranty claims, environmental and other matters arising in the ordinary course of business. Management makes assumptions and estimates concerning the likelihood and amount of any potential loss relating to these matters.
	We are currently a party to various legal proceedings. We accrue a liability for litigation if an unfavorable outcome is probable and the amount of loss can be reasonably estimated. If an unfavorable outcome is probable and a reasonable estimate of the loss is a range, we accrue the best estimate within the range; however, if no amount within the range is a better estimate than any other amount, the minimum within the range is accrued. Legal fees related to litigation are expensed as incurred. We do not believe that the ultimate outcome of these matters, either individually or in the aggregate, could have a material adverse effect on our financial position or overall trends in results of operations; however, litigation is subject to inherent uncertainties. Also, under our leases, tenants are typically obligated to indemnify us from and against all liabilities, costs and expenses imposed upon or asserted against us as owner of the properties due to certain matters relating to the operation of the properties by the tenant.
	Commitments
	At The Landmark at One Market, we lease, as lessee, a building adjacent to The Landmark under an operating lease effective through June 30, 2016, which we have the option to extend until 2026 by way of two five-year extension options.
	At Waikiki Beach Walk, we sublease a portion of the building of which Quiksilver is currently in possession, under an operating lease effective through December 31, 2021, which we have the option to extend at fair rental value in the event the sublessor extends its lease for the space with the master landlord. The lease payments under the lease will increase by approximately 3.4% annually through 2017 and, thereafter, will be equal to fair rental value, as defined in the lease, through lease expiration.
	Current minimum annual payments under the leases are as follows, as of March 31, 2014 (in thousands):
	Year Ending December 31,
	2014 (nine months ending December 31, 2014)	$	1,935
	2015	2,636
	2016	1,709
	2017	736		(1)
	2018	740
	Thereafter	2,221
	Total	$	9,977
	-1	Lease payments on the Waikiki Beach Walk lease will be equal to fair rental value from March 2017 through the end of the lease term. In the table, we have shown the lease payments for this period based on the stated rate for the month of February 2017 of $61,690.
	We have management agreements with Outrigger Hotels & Resorts or an affiliate thereof (“Outrigger”) pursuant to which Outrigger manages each of the retail and hotel portions of the Waikiki Beach Walk property. Under the management agreement with Outrigger relating to the retail portion of Waikiki Beach Walk (the “retail management agreement”), we pay Outrigger a monthly management fee of 3.0% of net revenues from the retail portion of Waikiki Beach Walk. Pursuant to the terms of the retail management agreement, if the agreement is terminated in certain instances, including our election not to repair damage or destruction at the property, a condemnation or our failure to make required working capital infusions, we would be obligated to pay Outrigger a termination fee equal to the sum of the management fees paid for the two calendar months immediately preceding the termination date. The retail management agreement may not be terminated by us or by Outrigger without cause. Under our management agreement with Outrigger relating to the hotel portion of Waikiki Beach Walk (the “hotel management agreement”), we pay Outrigger a monthly management fee of 6.0% of the hotel's gross operating profit, as well as 3.0% of the hotel's gross revenues; provided that the aggregate management fee payable to Outrigger for any year shall not exceed 3.5% of the hotel's gross revenues for such fiscal year. Pursuant to the terms of the hotel management agreement, if the agreement is terminated in certain instances, including upon a transfer by us of the hotel or upon a default by us under the hotel management agreement, we would be required to pay a cancellation fee calculated by multiplying (1) the management fees for the previous 12 months by (2) (a) eight, if the agreement is terminated in the first 11 years of its term, or (b) four, three, two or one, if the agreement is terminated in the twelfth, thirteenth, fourteenth or fifteenth year, respectively, of its term. The hotel management agreement may not be terminated by us or by Outrigger without cause.
	A wholly owned subsidiary of our Operating Partnership, WBW Hotel Lessee LLC, entered into a franchise license agreement with Embassy Suites Franchise LLC, the franchisor of the brand “Embassy Suites™,” to obtain the non-exclusive right to operate the hotel under the Embassy SuitesTM brand for 20 years. The franchise license agreement provides that WBW Hotel Lessee LLC must comply with certain management, operational, record keeping, accounting, reporting and marketing standards and procedures. In connection with this agreement, we are also subject to the terms of a product improvement plan pursuant to which we expect to undertake certain actions to ensure that our hotel's infrastructure is maintained in compliance with the franchisor's brand standards. In addition, we must pay to Embassy Suites Franchise LLC a monthly franchise royalty fee equal to 4.0% of the hotel's gross room revenue through December 2021 and 5.0% of the hotel's gross room revenue thereafter, as well as a monthly program fee equal to 4.0% of the hotel's gross room revenue. If the franchise license is terminated due to our failure to make required improvements or to otherwise comply with its terms, we may be liable to the franchisor for a termination payment, which could be as high as $6.5 million based on operating performance through March 31, 2014.
	We had a property management agreement with Langley Investment Properties, Inc. (“Langley”) pursuant to which Langley managed and operated Lloyd District Portfolio, and we paid Langley a monthly management fee of 3.5% of “gross receipts,” as defined in the property management agreement, as well as leasing commissions and construction oversight fees in certain situations. The property management agreement was terminated on February 1, 2013 by mutual consent of both parties. Langley continued to provide development consulting services to us until June 30, 2013 and leasing services to us until December 31, 2013 pursuant to a development, consulting, leasing and transition services and management termination agreement.
	Our Del Monte Center property has ongoing environmental remediation related to ground water contamination. The environmental issue existed at purchase and remains in remediation. The final stages of the remediation will include routine, long term ground monitoring by the appropriate regulatory agency over the next two to ten years. The work performed is financed through an escrow account funded by the seller upon purchase of the Del Monte Center. We believe the funds in the escrow account are sufficient for the remaining work to be performed. However, if further work is required costing more than the remaining escrow funds, we could be required to pay such overage, although we may have a contractual claim for such costs against the prior owner or our environmental remediation consultant.
	In connection with our initial public offering, we entered into tax protection agreements with certain limited partners of our Operating Partnership. These agreements provide that if we dispose of any interest with respect to Carmel Country Plaza, Carmel Mountain Plaza, Del Monte Center, Loma Palisades, Lomas Santa Fe Plaza, Waikele Center or the ICW Plaza portion of Torrey Reserve Campus, in a taxable transaction during the period from the closing of our initial public offering through January 19, 2018, we will indemnify such limited partners for their tax liabilities attributable to their share of the built-in gain that existed with respect to such property interest as of the time of our initial public offering and tax liabilities incurred as a result of the reimbursement payment. Subject to certain exceptions and limitations, the indemnification rights will terminate for any such protected partner that sells, exchanges or otherwise disposes of more than 50% of his or her common units. We have no present intention to sell or otherwise dispose of the properties or interest therein in taxable transactions during the restriction period. If we were to trigger the tax protection provisions under these agreements, we would be required to pay damages in the amount of the taxes owed by these limited partners (plus additional damages in the amount of the taxes incurred as a result of such payment).
	As of March 31, 2014, the Company has accrued approximately $6.6 million for transfer taxes that the Company expected to incur on its California properties in connection with its initial public offering.   The Company believes that it has filed all necessary forms with the requisite taxing authorities, but can offer no assurances that the taxing authorities will agree with the Company's estimate above.
	Concentrations of Credit Risk
	Our properties are located in Southern California, Northern California, Hawaii, Oregon, Texas, and Washington. The ability of the tenants to honor the terms of their respective leases is dependent upon the economic, regulatory and social factors affecting the markets in which the tenants operate. Twelve of our consolidated properties are located in Southern California, which exposes us to greater economic risks than if we owned a more geographically diverse portfolio. Tenants in the retail industry accounted for 36.0% of total revenues for the three months ended March 31, 2014. This makes us susceptible to demand for retail rental space and subject to the risks associated with an investment in real estate with a concentration of tenants in the retail industry. Furthermore, tenants in the office industry accounted for 35.7% of total revenues for the three months ended March 31, 2014. This makes us susceptible to demand for office rental space and subject to the risks associated with an investment in real estate with a concentration of tenants in the office industry. For the three months ended March 31, 2014 and 2013, no tenant accounted for more than 10% of our total rental revenue.

OPERATING_LEASES

OPERATING LEASES	3 Months Ended
	Mar. 31, 2014
Leases [Abstract]	'
OPERATING LEASES	'
	OPERATING LEASES
	Our leases with office, retail, mixed-use and residential tenants are classified as operating leases. Leases at our office and retail properties and the retail portion of our mixed-use property generally range from three to ten years (certain leases with anchor tenants may be longer), and in addition to minimum rents, usually provide for cost recoveries for the tenant’s share of certain operating costs and also may include percentage rents based on the tenant’s level of sales achieved. Leases on apartments generally range from 7 to 15 months, with a majority having 12-month lease terms. Rooms at the hotel portion of our mixed-use property are rented on a nightly basis.
	As of March 31, 2014, minimum future rentals from noncancelable operating leases, before any reserve for uncollectible amounts and assuming no early lease terminations, at our office and retail properties and the retail portion of our mixed-use property are as follows (in thousands):
	Year Ending December 31,
	2014 (nine months ending December 31, 2014)	$	116,016
	2015	148,996
	2016	129,347
	2017	112,064
	2018	79,838
	Thereafter	155,343
	Total	$	741,604
	The above future minimum rentals exclude residential leases, which typically have a term of 12 months or less, and exclude the hotel, as rooms are rented on a nightly basis.

COMPONENTS_OF_RENTAL_INCOME_AN

COMPONENTS OF RENTAL INCOME AND EXPENSE	3 Months Ended
	Mar. 31, 2014
Operating Leases, Income Statement, Lease Revenue [Abstract]	'
COMPONENTS OF RENTAL INCOME AND EXPENSE	'
	COMPONENTS OF RENTAL INCOME AND EXPENSE
	The principal components of rental income are as follows (in thousands):
		Three Months Ended March 31,
		2014		2013
	Minimum rents
	Retail	$	17,292	$	17,351
	Office	20,236		20,500
	Multifamily	3,834		3,583
	Mixed-use	2,470		2,420
	Cost reimbursement	6,804		5,671
	Percentage rent	425		418
	Hotel revenue	9,002		8,848
	Other	419		431
	Total rental income	$	60,482	$	59,222
	Minimum rents include $1.0 million and $0.7 million for the three months ended March 31, 2014 and 2013, respectively, to recognize minimum rents on a straight-line basis. In addition, net amortization of above and below market leases included in minimum rents were $0.6 million and $0.5 million for the three months ended March 31, 2014 and 2013.
	The principal components of rental expenses are as follows (in thousands):
		Three Months Ended March 31,
		2014		2013
	Rental operating	$	6,526	$	6,314
	Hotel operating	5,553		5,482
	Repairs and maintenance	2,122		2,114
	Marketing	390		352
	Rent	611		613
	Hawaii excise tax	965		939
	Management fees	453		472
	Total rental expenses	$	16,620	$	16,286

OTHER_INCOME_NET

OTHER INCOME , NET	3 Months Ended
	Mar. 31, 2014
Other Income and Expenses [Abstract]	'
OTHER INCOME (EXPENSE), NET	'
	OTHER INCOME (EXPENSE), NET
	The principal components of other income (expense), net, are as follows (in thousands):
		Three Months Ended March 31,
		2014			2013
	Interest and investment income	$	48		$	8
	Income tax expense	(112		)	(297		)
	Other non-operating income	—			10
	Total other income (expense), net	$	(64	)	$	(279	)

RELATED_PARTY_TRANSACTIONS

RELATED PARTY TRANSACTIONS	3 Months Ended
	Mar. 31, 2014
Related Party Transactions [Abstract]	'
RELATED PARTY TRANSACTIONS	'
	RELATED PARTY TRANSACTIONS
	At ICW Plaza, we lease space to Insurance Company of the West, which is under the indirect control of Ernest Rady, our Executive Chairman of the Board. Rental revenue recognized on the leases of $0.5 million for each of the three months ended March 31, 2014 and 2013, respectively, is included in rental income.
	The Waikiki Beach Walk entities have a 47.7% investment in WBW CHP LLC, an entity that was formed to, among other things, construct a chilled water plant to provide air conditioning to the property and other adjacent facilities. The operating expenses of WBW CHP LLC are recovered through reimbursements from its members, and reimbursements to WBW CHP LLC of $0.3 million and $0.2 million, respectively, were made for the three months ended March 31, 2014 and 2013 and are included in rental expenses on the statement of income.

SEGMENT_REPORTING

SEGMENT REPORTING	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
SEGMENT REPORTING	'
	SEGMENT REPORTING
	Segment information is prepared on the same basis that our management reviews information for operational decision-making purposes. We operate in four business segments: the acquisition, redevelopment, ownership and management of retail real estate, office real estate, multifamily real estate and mixed-use real estate. The products for our retail segment primarily include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our office segment primarily include rental of office space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our multifamily segment include rental of apartments and other tenant services. The products of our mixed-use segment include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental and operation of a 369-room all-suite hotel.
	We evaluate the performance of our segments based on segment profit, which is defined as property revenue less property expenses. We do not use asset information as a measure to assess performance and make decisions to allocate resources. Therefore, depreciation and amortization expense is not allocated among segments. General and administrative expenses, interest expense, depreciation and amortization expense and other income and expense are not included in segment profit as our internal reporting addresses these items on a corporate level.
	Segment profit is not a measure of operating income or cash flows from operating activities as measured by GAAP, and it is not indicative of cash available to fund cash needs and should not be considered an alternative to cash flows as a measure of liquidity. Not all companies calculate segment profit in the same manner. We consider segment profit to be an appropriate supplemental measure to net income because it assists both investors and management in understanding the core operations of our properties.
	The following table represents operating activity within our reportable segments (in thousands):
		Three Months Ended March 31,
		2014			2013
	Total Retail
	Property revenue	$	22,999		$	22,154
	Property expense	(6,058		)	(4,971		)
	Segment profit	16,941			17,183
	Total Office
	Property revenue	22,831			22,422
	Property expense	(6,893		)	(6,436		)
	Segment profit	15,938			15,986
	Total Multifamily
	Property revenue	4,130			3,875
	Property expense	(1,427		)	(1,442		)
	Segment profit	2,703			2,433
	Total Mixed-Use
	Property revenue	13,993			13,729
	Property expense	(8,268		)	(8,237		)
	Segment profit	5,725			5,492
	Total segments’ profit	$	41,307		$	41,094
	The following table is a reconciliation of segment profit to net income attributable to stockholders (in thousands):
		Three Months Ended March 31,
		2014			2013
	Total segments’ profit	$	41,307		$	41,094
	General and administrative	(4,612		)	(4,201		)
	Depreciation and amortization	(16,341		)	(17,013		)
	Interest expense	(13,632		)	(14,736		)
	Other income (expense), net	(64		)	(279		)
	Net income	6,658			4,865
	Net income attributable to restricted shares	(70		)	(132		)
	Net income attributable to unitholders in the Operating Partnership	(1,986		)	(1,495		)
	Net income attributable to American Assets Trust, Inc. stockholders	$	4,602		$	3,238
	The following table shows net real estate and secured note payable balances for each of the segments (in thousands):
		March 31, 2014			December 31, 2013
	Net Real Estate
	Retail	$	647,816		$	651,707
	Office	811,097			790,153
	Multifamily	34,984			35,349
	Mixed-Use	199,032			199,627
		$	1,692,929		$	1,676,836
	Secured Notes Payable (1)
	Retail	$	303,101		$	303,249
	Office	427,000			427,256
	Multifamily	101,444			101,444
	Mixed-Use	130,310			130,310
		$	961,855		$	962,259
	-1	Excludes unamortized fair market value adjustments of $9.4 million and $10.1 million as of March 31, 2014 and December 31, 2013, respectively.
	Capital expenditures for each segment for the three months ended March 31, 2014 and 2013 were as follows (in thousands):
		Three Months Ended March 31,
		2014			2013
	Capital Expenditures (1)
	Retail	$	1,506		$	1,947
	Office	7,091			7,862
	Multifamily	21,877			143
	Mixed-Use	822			288
		$	31,296		$	10,240
	-1	Capital expenditures represent cash paid for capital expenditures during the period and include leasing commissions paid.

SUMMARY_OF_SIGNIFICANT_ACCOUNT1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Business and Organization	'
	Business and Organization
	American Assets Trust, Inc. (which may be referred to in these financial statements as the “Company,” “we,” “us,” or “our”) is a Maryland corporation formed on July 16, 2010 that did not have any operating activity until the consummation of our initial public offering on January 19, 2011. The Company is the sole general partner of American Assets Trust, L.P., a Maryland limited partnership formed on July 16, 2010 (the “Operating Partnership”). The Company’s operations are carried on through our Operating Partnership and its subsidiaries, including our taxable real estate investment trust ("REIT") subsidiary ("TRS"). Since the formation of our Operating Partnership, the Company has controlled our Operating Partnership as its general partner and has consolidated its assets, liabilities and results of operations.
	We are a full service vertically integrated and self-administered REIT with approximately 120 employees providing substantial in-house expertise in asset management, property management, property development, leasing, tenant improvement construction, acquisitions, repositioning, redevelopment and financing.
	As of March 31, 2014, we owned or had a controlling interest in 23 office, retail, multifamily and mixed-use operating properties, the operations of which we consolidate. Additionally, as of March 31, 2014, we owned land at five of our properties that we classify as held for development and/or construction in progress. A summary of the properties owned by us is as follows:
	Retail
	Carmel Country Plaza	Del Monte Center
	Carmel Mountain Plaza	Geary Marketplace
	South Bay Marketplace	The Shops at Kalakaua
	Rancho Carmel Plaza	Waikele Center
	Lomas Santa Fe Plaza	Alamo Quarry Market
	Solana Beach Towne Centre
	Office
	Torrey Reserve Campus	Lloyd District Portfolio
	Solana Beach Corporate Centre	City Center Bellevue
	The Landmark at One Market
	One Beach Street
	First & Main
	Multifamily
	Loma Palisades
	Imperial Beach Gardens
	Mariner's Point
	Santa Fe Park RV Resort
	Mixed-Use
	Waikiki Beach Walk Retail and Embassy Suites™ Hotel
	Held for Development and Construction in Progress
	Solana Beach Corporate Centre – Land
	Solana Beach – Highway 101 – Land
	Sorrento Pointe – Land
	Torrey Reserve – Land
	Lloyd District Portfolio – Land
Basis of Presentation	'
	Basis of Presentation
	Our consolidated financial statements include the accounts of the Company, our Operating Partnership and our subsidiaries. The equity interests of other investors in our Operating Partnership are reflected as noncontrolling interests.
	All significant intercompany transactions and balances are eliminated in consolidation.
	The accompanying consolidated financial statements of the Company have been prepared in accordance with the rules applicable to Form 10-Q and include all information and footnotes required for interim financial statement presentation, but do not include all disclosures required under accounting principles generally accepted in the United States (“GAAP”) for annual financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments, except as otherwise noted) considered necessary for a fair presentation have been included. These financial statements should be read in conjunction with the audited consolidated financial statements and notes therein included in the Company's annual report on Form 10-K for the year ended December 31, 2013.
	The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and revenues and expenses. These estimates are prepared using our best judgment, after considering past, current and expected events and economic conditions. Actual results could differ from these estimates.
	Any reference to the number of properties and square footage are unaudited and outside the scope of our independent registered public accounting firm’s review of our financial statements in accordance with the standards of the United States Public Company Accounting Oversight Board.
Significant Accounting Policies	'
	Significant Accounting Policies
	We describe our significant accounting policies in Note 1 to the consolidated financial statements in Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2013. There have been no changes to our significant accounting policies during the three months ended March 31, 2014.
Segment Information	'
	Segment Information
	Segment information is prepared on the same basis that our management reviews information for operational decision-making purposes. We operate in four business segments: the acquisition, redevelopment, ownership and management of retail real estate, office real estate, multifamily real estate and mixed-use real estate. The products for our retail segment primarily include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our office segment primarily include rental of office space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our multifamily segment include rental of apartments and other tenant services. The products of our mixed-use segment include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental and operation of a 369-room all-suite hotel.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In February 2013, the Financial Accounting Standards Board (the "FASB") issued ASU 2013-2, Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income. ASU 2013-2 requires entities to disclose certain information relating to amounts reclassified out of accumulated other comprehensive income. This pronouncement became effective for us in the first quarter of 2013 and did not have a significant impact on our consolidated financial statements.
Fair Value Measurements	'
	A fair value measurement is based on the assumptions that market participants would use in pricing an asset or liability. The hierarchy for inputs used in measuring fair value is as follows:
	1	Level 1 Inputs—quoted prices in active markets for identical assets or liabilities
	2	Level 2 Inputs—observable inputs other than quoted prices in active markets for identical assets and liabilities
	3	Level 3 Inputs—unobservable inputs
	Except as disclosed below, the carrying amounts of our financial instruments approximate their fair value. The financial liability whose fair value we measure on a recurring basis using Level 2 inputs is our deferred compensation liability included in other liabilities and deferred credits on the consolidated balance sheet. We measure the fair value of this liability based on prices provided by independent market participants that are based on observable inputs using market-based valuation techniques.
	In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement.

SUMMARY_OF_SIGNIFICANT_ACCOUNT2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Consolidated Statements of Cash Flows-Supplemental Disclosures	'
	The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows (in thousands):
		Three Months Ended March 31,
		2014			2013
	Supplemental cash flow information
	Total interest costs incurred	$	14,467		$	15,093
	Interest capitalized	$	835		$	357
	Interest expense	$	13,632		$	14,736
	Cash paid for interest, net of amounts capitalized	$	12,724		$	13,128
	Cash paid for income taxes	$	—		$	—
	Supplemental schedule of noncash investing and financing activities
	Accounts payable and accrued liabilities for construction in progress	$	(890	)	$	556
	Accrued leasing commissions	$	(630	)	$	689

ACQUIRED_INPLACE_LEASES_AND_AB1

ACQUIRED IN-PLACE LEASES AND ABOVE/BELOW MARKET LEASES (Tables)	3 Months Ended
	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of acquired lease intangibles included in other assets and other liabilities	'
	The following summarizes our acquired lease intangibles and leasing costs, which are included in other assets and other liabilities and deferred credits, as of March 31, 2014 and December 31, 2013 (in thousands):
		March 31, 2014			December 31, 2013
	In-place leases	$	62,734		$	62,813
	Accumulated amortization	(39,882		)	(38,279		)
	Above market leases	28,262			28,279
	Accumulated amortization	(21,570		)	(20,880		)
	Acquired lease intangible assets, net	$	29,544		$	31,933
	Below market leases	$	76,502		$	76,502
	Accumulated accretion	(29,887		)	(28,592		)
	Acquired lease intangible liabilities, net	$	46,615		$	47,910

FAIR_VALUE_OF_FINANCIAL_INSTRU1

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Financial liabilities measured at fair value on recurring basis	'
	A summary of our financial liabilities that are measured at fair value on a recurring basis, by level within the fair value hierarchy is as follows (in thousands):
		March 31, 2014											December 31, 2013
		Level 1		Level 2			Level 3			Total			Level 1		Level 2		Level 3		Total
	Deferred compensation liability	$	—	$	821		$	—		$	821		$	—	$	769	$	—	$	769
	Interest rate swap	$	—	$	746		$	—		$	746		$	—	$	—	$	—	$	—
Carrying amount and fair value of financial instruments	'
	A summary of the carrying amount and fair value of our secured financial instruments, all of which are based on Level 2 inputs, is as follows (in thousands):
		March 31, 2014							December 31, 2013
		Carrying Value			Fair Value				Carrying Value			Fair Value
	Secured notes payable	$	952,498		$	993,568			$	952,174		$	990,296
	Term loan	$	100,000		$	100,000			$	—		$	—
	Line of credit	$	—		$	—			$	93,000		$	93,000

OTHER_ASSETS_Tables

OTHER ASSETS (Tables)	3 Months Ended
	Mar. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'
Components of Other Assets	'
	Other assets consist of the following (in thousands):
		March 31, 2014		December 31, 2013
	Leasing commissions, net of accumulated amortization of $20,523 and $19,606 respectively	$	17,152	$	18,071
	Acquired above market leases, net	6,692		7,399
	Acquired in-place leases, net	22,852		24,534
	Lease incentives, net of accumulated amortization of $2,683 and $2,590, respectively	1,017		1,110
	Other intangible assets, net of accumulated amortization of $1,600 and $1,554, respectively	598		655
	Debt issuance costs, net of accumulated amortization of $3,272 and $2,985, respectively	4,302		2,632
	Prepaid expenses and other	3,713		3,269
	Total other assets	$	56,326	$	57,670

OTHER_LIABILITIES_AND_DEFERRED1

OTHER LIABILITIES AND DEFERRED CREDITS (Tables)	3 Months Ended
	Mar. 31, 2014
Other Liabilities Disclosure [Abstract]	'
Other liabilities and deferred credits	'
	Other liabilities and deferred credits consist of the following (in thousands):
		March 31, 2014		December 31, 2013
	Acquired below market leases, net	$	46,615	$	47,910
	Prepaid rent and deferred revenue	8,209		7,506
	Deferred rent expense and lease intangible	773		829
	Deferred compensation	821		769
	Deferred tax liability	233		233
	Straight-line rent liability	1,020		1,145
	Interest rate swap liability	746		—
	Other liabilities	97		73
	Total other liabilities and deferred credits	$	58,514	$	58,465

DEBT_Tables

DEBT (Tables)	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Summary of total secured notes payable outstanding	'
	The following is a summary of our total secured notes payable outstanding as of March 31, 2014 and December 31, 2013 (in thousands):
		Principal Balance as of						Stated Interest		Stated Maturity Date
								Rate as of
	Description of Debt	March 31, 2014			December 31, 2013			31-Mar-14
	Waikele Center (1)	140,700			140,700			5.15	%	November 1, 2014
	The Shops at Kalakaua (1)	19,000			19,000			5.45	%	May 1, 2015
	The Landmark at One Market (1)(2)	133,000			133,000			5.61	%	July 5, 2015
	Del Monte Center (1)	82,300			82,300			4.93	%	July 8, 2015
	First & Main (1)	84,500			84,500			3.97	%	July 1, 2016
	Imperial Beach Gardens (1)	20,000			20,000			6.16	%	September 1, 2016
	Mariner’s Point (1)	7,700			7,700			6.09	%	September 1, 2016
	South Bay Marketplace (1)	23,000			23,000			5.48	%	February 10, 2017
	Waikiki Beach Walk—Retail (1)	130,310			130,310			5.39	%	July 1, 2017
	Solana Beach Corporate Centre III-IV (3)	36,691			36,804			6.39	%	August 1, 2017
	Loma Palisades (1)	73,744			73,744			6.09	%	July 1, 2018
	One Beach Street (1)	21,900			21,900			3.94	%	April 1, 2019
	Torrey Reserve—North Court (3)	21,304			21,377			7.22	%	June 1, 2019
	Torrey Reserve—VCI, VCII, VCIII (3)	7,175			7,200			6.36	%	June 1, 2020
	Solana Beach Corporate Centre I-II (3)	11,430			11,475			5.91	%	June 1, 2020
	Solana Beach Towne Centre (3)	38,101			38,249			5.91	%	June 1, 2020
	City Center Bellevue (1)	111,000			111,000			3.98	%	November 1, 2022
		961,855			962,259
	Unamortized fair value adjustment	(9,357		)	(10,085		)
	Total Secured Notes Payable Outstanding	$	952,498		$	952,174
	-1	Interest only.
	-2	Maturity Date is the earlier of the loan maturity date under the loan agreement, or the “Anticipated Repayment Date” as specifically defined in the loan agreement, which is the date after which substantial economic penalties apply if the loan has not been paid off.
	-3	Principal payments based on a 30-year amortization schedule.

EQUITY_Tables

EQUITY (Tables)	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Dividends declared and paid on shares of common stock and noncontrolling common units	'
	The following table lists the dividends declared and paid on our shares of common stock and noncontrolling common units during the three months ended March 31, 2014:
	Period		Amount  per				Period Covered		Dividend Paid Date
			Share/Unit
	First Quarter 2014		$	0.22			January 1, 2014 to March 31, 2014		March 28, 2014
Activity of restricted stock awards	'
	The following table summarizes the activity of restricted stock awards during the three months ended March 31, 2014:
		Units			Weighted Average Grant Date Fair Value
	Nonvested at January 1, 2014	629,058			$	15.58
	Granted	112,119			29.96
	Vested	(310,194	)		15.42
	Forfeited	—			—
	Nonvested at March 31, 2014	430,983			$	19.44
Computation of basic and diluted EPS	'
	The computation of basic and diluted EPS is presented below (dollars in thousands, except share and per share amounts):
		Three Months Ended March 31,
		2014				2013
	NUMERATOR
	Income from operations	$	6,658			$	4,865
	Less: Net income attributable to restricted shares	(70		)		(132		)
	Less: Income from operations attributable to unitholders in the Operating Partnership	(1,986		)		(1,495		)
	Net income attributable to common stockholders—basic	$	4,602			$	3,238
	Income from operations attributable to American Assets Trust, Inc. common stockholders—basic	$	4,602			$	3,238
	Plus: Income from operations attributable to unitholders in the Operating Partnership	1,986				1,495
	Net income attributable to common stockholders—diluted	$	6,588			$	4,733
	DENOMINATOR
	Weighted average common shares outstanding—basic	40,582,792				39,033,013
	Effect of dilutive securities—conversion of Operating Partnership units	17,909,681				18,023,435
	Weighted average common shares outstanding—diluted	58,492,473				57,056,448
	Earnings per common share, basic	$	0.11			$	0.08
	Earnings per common share, diluted	$	0.11			$	0.08

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Tables)	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Current minimum annual payments under the leases	'
	Current minimum annual payments under the leases are as follows, as of March 31, 2014 (in thousands):
	Year Ending December 31,
	2014 (nine months ending December 31, 2014)	$	1,935
	2015	2,636
	2016	1,709
	2017	736		(1)
	2018	740
	Thereafter	2,221
	Total	$	9,977
	-1	Lease payments on the Waikiki Beach Walk lease will be equal to fair rental value from March 2017 through the end of the lease term. In the table, we have shown the lease payments for this period based on the stated rate for the month of February 2017 of $61,690.

OPERATING_LEASES_Tables

OPERATING LEASES (Tables)	3 Months Ended
	Mar. 31, 2014
Leases [Abstract]	'
Current minimum future rentals under the leases	'
	As of March 31, 2014, minimum future rentals from noncancelable operating leases, before any reserve for uncollectible amounts and assuming no early lease terminations, at our office and retail properties and the retail portion of our mixed-use property are as follows (in thousands):
	Year Ending December 31,
	2014 (nine months ending December 31, 2014)	$	116,016
	2015	148,996
	2016	129,347
	2017	112,064
	2018	79,838
	Thereafter	155,343
	Total	$	741,604

COMPONENTS_OF_RENTAL_INCOME_AN1

COMPONENTS OF RENTAL INCOME AND EXPENSE (Tables)	3 Months Ended
	Mar. 31, 2014
Operating Leases, Income Statement, Lease Revenue [Abstract]	'
Principal components of rental income	'
	The principal components of rental income are as follows (in thousands):
		Three Months Ended March 31,
		2014		2013
	Minimum rents
	Retail	$	17,292	$	17,351
	Office	20,236		20,500
	Multifamily	3,834		3,583
	Mixed-use	2,470		2,420
	Cost reimbursement	6,804		5,671
	Percentage rent	425		418
	Hotel revenue	9,002		8,848
	Other	419		431
	Total rental income	$	60,482	$	59,222
Principal components of rental expenses	'
	The principal components of rental expenses are as follows (in thousands):
		Three Months Ended March 31,
		2014		2013
	Rental operating	$	6,526	$	6,314
	Hotel operating	5,553		5,482
	Repairs and maintenance	2,122		2,114
	Marketing	390		352
	Rent	611		613
	Hawaii excise tax	965		939
	Management fees	453		472
	Total rental expenses	$	16,620	$	16,286

OTHER_INCOME_NET_Tables

OTHER INCOME , NET (Tables)	3 Months Ended
	Mar. 31, 2014
Other Income and Expenses [Abstract]	'
Principal components of other income (expense), net	'
	The principal components of other income (expense), net, are as follows (in thousands):
		Three Months Ended March 31,
		2014			2013
	Interest and investment income	$	48		$	8
	Income tax expense	(112		)	(297		)
	Other non-operating income	—			10
	Total other income (expense), net	$	(64	)	$	(279	)

SEGMENT_REPORTING_Tables

SEGMENT REPORTING (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Schedule of segments operating activity	'
	The following table represents operating activity within our reportable segments (in thousands):
		Three Months Ended March 31,
		2014			2013
	Total Retail
	Property revenue	$	22,999		$	22,154
	Property expense	(6,058		)	(4,971		)
	Segment profit	16,941			17,183
	Total Office
	Property revenue	22,831			22,422
	Property expense	(6,893		)	(6,436		)
	Segment profit	15,938			15,986
	Total Multifamily
	Property revenue	4,130			3,875
	Property expense	(1,427		)	(1,442		)
	Segment profit	2,703			2,433
	Total Mixed-Use
	Property revenue	13,993			13,729
	Property expense	(8,268		)	(8,237		)
	Segment profit	5,725			5,492
	Total segments’ profit	$	41,307		$	41,094
Reconciliation of segment profit to net income attributable to stockholders	'
	The following table is a reconciliation of segment profit to net income attributable to stockholders (in thousands):
		Three Months Ended March 31,
		2014			2013
	Total segments’ profit	$	41,307		$	41,094
	General and administrative	(4,612		)	(4,201		)
	Depreciation and amortization	(16,341		)	(17,013		)
	Interest expense	(13,632		)	(14,736		)
	Other income (expense), net	(64		)	(279		)
	Net income	6,658			4,865
	Net income attributable to restricted shares	(70		)	(132		)
	Net income attributable to unitholders in the Operating Partnership	(1,986		)	(1,495		)
	Net income attributable to American Assets Trust, Inc. stockholders	$	4,602		$	3,238
Net real estate and secured note payable balances by segments	'
	The following table shows net real estate and secured note payable balances for each of the segments (in thousands):
		March 31, 2014			December 31, 2013
	Net Real Estate
	Retail	$	647,816		$	651,707
	Office	811,097			790,153
	Multifamily	34,984			35,349
	Mixed-Use	199,032			199,627
		$	1,692,929		$	1,676,836
	Secured Notes Payable (1)
	Retail	$	303,101		$	303,249
	Office	427,000			427,256
	Multifamily	101,444			101,444
	Mixed-Use	130,310			130,310
		$	961,855		$	962,259
	-1	Excludes unamortized fair market value adjustments of $9.4 million and $10.1 million as of March 31, 2014 and December 31, 2013, respectively.
Capital expenditures for each segment	'
	Capital expenditures for each segment for the three months ended March 31, 2014 and 2013 were as follows (in thousands):
		Three Months Ended March 31,
		2014			2013
	Capital Expenditures (1)
	Retail	$	1,506		$	1,947
	Office	7,091			7,862
	Multifamily	21,877			143
	Mixed-Use	822			288
		$	31,296		$	10,240
	-1	Capital expenditures represent cash paid for capital expenditures during the period and include leasing commissions paid.

SUMMARY_OF_SIGNIFICANT_ACCOUNT3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Jan. 09, 2014	Dec. 31, 2013
	Segment
	Property
	Employee
	Room
Derivative [Line Items]	'	'	'
Number of employees	120	'	'
Office, retail, multifamily, and mixed-use Operating properties	23	'	'
Properties held for development	5	'	'
Number of operating segments	4	'	'
Room in mixed-use segment all-suite hotel	369	'	'
Term loan	$100,000,000	$100,000,000	$0
Cash Flow Hedging | Interest Rate Swap	'	'	'
Derivative [Line Items]	'	'	'
Notional amount	'	$100,000,000	'
Interest rate on derivative	'	3.08%	'

SUMMARY_OF_SIGNIFICANT_ACCOUNT4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Supplement Disclosures Related to Consolidated Statements of Cash Flows (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Accounting Policies [Abstract]	'	'
Total interest costs incurred	$14,467	$15,093
Interest capitalized	835	357
Interest expense	13,632	14,736
Cash paid for interest, net of amounts capitalized	12,724	13,128
Cash paid for income taxes	0	0
Accounts payable and accrued liabilities for construction in progress	-890	556
Accrued leasing commissions	($630)	$689

ACQUIRED_INPLACE_LEASES_AND_AB2

ACQUIRED IN-PLACE LEASES AND ABOVE/BELOW MARKET LEASES Acquired Lease Intangibles and Leasing Costs Included in Other Assets and Other Liabilities and Deferred Credits (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Acquired above market leases, net	$6,692	$7,399
Other intangible assets, accumulated amortization	-1,600	-1,554
Below market leases	76,502	76,502
Below market leases, accumulated amortization	-29,887	-28,592
Acquired lease intangible liabilities, net	46,615	47,910
Leases, Acquired-in-Place	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Acquired above market leases, net	62,734	62,813
Other intangible assets, accumulated amortization	-39,882	-38,279
Above Market Leases	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Acquired above market leases, net	28,262	28,279
Other intangible assets, accumulated amortization	-21,570	-20,880
Lease Agreements	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Acquired lease intangible assets, net	$29,544	$31,933

FAIR_VALUE_OF_FINANCIAL_INSTRU2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
			Minimum	Maximum	Deferred Credits and Other Liabilities	Interest Rate Swap
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'	'	'	'
Fair value of interest rate swap	$746,000	$0	'	'	$700,000	'
Change in valuation of interest rate swaps	'	'	'	'	'	$700,000
Rates of secured notes payable	'	'	3.53%	5.18%	'	'

FAIR_VALUE_OF_FINANCIAL_INSTRU3

FAIR VALUE OF FINANCIAL INSTRUMENTS Financial Liabilities Fair Value Measurement on a Recurring Basis (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Deferred compensation liability	$821	$769
Fair value of interest rate swap	746	0
Fair Value, Inputs, Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Deferred compensation liability	0	0
Fair value of interest rate swap	0	0
Fair Value, Inputs, Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Deferred compensation liability	821	769
Fair value of interest rate swap	746	0
Fair Value, Inputs, Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Deferred compensation liability	0	0
Fair value of interest rate swap	$0	$0

FAIR_VALUE_OF_FINANCIAL_INSTRU4

FAIR VALUE OF FINANCIAL INSTRUMENTS Carrying Amount and Fair Value of Financial Instruments (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Secured notes payable | Carrying Value	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term Debt, Fair Value	$952,498	$952,174
Secured notes payable | Fair Value	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term Debt, Fair Value	993,568	990,296
Term loan | Carrying Value	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term Debt, Fair Value	100,000	0
Term loan | Fair Value	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term Debt, Fair Value	100,000	0
Line of credit | Carrying Value	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term Debt, Fair Value	0	93,000
Line of credit | Fair Value	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term Debt, Fair Value	$0	$93,000

OTHER_ASSETS_Details

OTHER ASSETS (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'	'
Leasing commissions, net of accumulated amortization of $20,523 and $19,606 respectively	$17,152	$18,071
Acquired above market leases, net	6,692	7,399
Acquired in-place leases, net	22,852	24,534
Lease incentives, net of accumulated amortization of $2,683 and $2,590, respectively	1,017	1,110
Other intangible assets, net of accumulated amortization of $1,600 and $1,554, respectively	598	655
Debt issuance costs, net of accumulated amortization of $3,272 and $2,985, respectively	4,302	2,632
Prepaid expenses and other	3,713	3,269
Total other assets	$56,326	$57,670

OTHER_ASSETS_Parenthetical_Det

OTHER ASSETS (Parenthetical) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'	'
Leasing commissions, accumulative amortization	$20,523	$19,606
Lease incentives, accumulated amortization	2,683	2,590
Other intangible assets, accumulated amortization	1,600	1,554
Debt issuance costs, accumulated amortization	$3,272	$2,985

OTHER_LIABILITIES_AND_DEFERRED2

OTHER LIABILITIES AND DEFERRED CREDITS (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Liabilities Disclosure [Abstract]	'	'
Acquired below market leases, net	$46,615	$47,910
Prepaid rent and deferred revenue	8,209	7,506
Deferred rent expense and lease intangible	773	829
Deferred compensation	821	769
Deferred tax liability	233	233
Straight-line rent liability	1,020	1,145
Interest rate swap liability	746	0
Other liabilities	97	73
Total other liabilities and deferred credits	$58,514	$58,465

DEBT_Details

DEBT (Details) (USD $)	0 Months Ended
	Jan. 09, 2014
	Extension_Option
Amended and Restated Credit Facility	'
Debt Instrument [Line Items]	'
Revolving credit facility borrowing limit, maximum borrowing capacity	$350,000,000
Outstanding amount on credit facility	100,000,000
Amended and Restated Credit Facility | Subject to meeting specified requirements and obtaining additional commitments	'
Debt Instrument [Line Items]	'
Line of Credit Facility, Allowable Additional Borrowing Capacity	250,000,000
Line of credit | Amended and Restated Credit Facility	'
Debt Instrument [Line Items]	'
Maximum leverage ratio of revolving credit facility (in percent)	60.00%
Maximum Leverage Ratio, Material Acquisition Period	65.00%
Percent of net proceeds of any additional equity issuances in relation to net proceeds as of Offering	75.00%
Maximum Recourse Indebtedness of Total Asset Value	15.00%
Maximum Unsecured Leverage Ratio	60.00%
Maximum Unsecured Leverage Ratio, Material Acquisition Period	65.00%
Minimum Tangible Net Worth	721,160,000
Percentage Limit On Annual Distributions In Relation To Funds From Operations	95.00%
Line of credit | Amended and Restated Credit Facility | Revolving Credit Facility	'
Debt Instrument [Line Items]	'
Revolving credit facility borrowing limit, maximum borrowing capacity	250,000,000
Debt Instrument, Extension Options	2
Debt Instrument, Extension Term	'6 months
Line of credit | Amended and Restated Credit Facility | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility	'
Debt Instrument [Line Items]	'
Debt Instrument, Description of Variable Rate Basis	'LIBOR
Line of credit | Amended and Restated Credit Facility | Base Rate	'
Debt Instrument [Line Items]	'
Debt Instrument, Description of Variable Rate Basis	'base rate
Debt Instrument, Variable Rate Basis, One	'prime rate
Debt Instrument, Spread on Variable Rate Basis, Two	0.50%
Debt Instrument, Spread on Variable Rate Basis, Three	1.00%
Debt Instrument, Variable Rate Basis, Two	'federal funds rate
Debt Instrument, Variable Rate Basis, Three	'Eurodollar
Term loan | Amended and Restated Credit Facility	'
Debt Instrument [Line Items]	'
Revolving credit facility borrowing limit, maximum borrowing capacity	$100,000,000
Debt Instrument, Extension Options	3
Debt Instrument, Extension Term	'12 months
Term loan | Amended and Restated Credit Facility | London Interbank Offered Rate (LIBOR)	'
Debt Instrument [Line Items]	'
Debt Instrument, Description of Variable Rate Basis	'LIBOR
Minimum | Amended and Restated Credit Facility | Base Rate | Revolving Credit Facility	'
Debt Instrument [Line Items]	'
Debt Instrument, Basis Spread on Variable Rate	0.35%
Minimum | Line of credit | Amended and Restated Credit Facility | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility	'
Debt Instrument [Line Items]	'
Debt Instrument, Basis Spread on Variable Rate	1.35%
Minimum | Term loan | Amended and Restated Credit Facility | London Interbank Offered Rate (LIBOR)	'
Debt Instrument [Line Items]	'
Debt Instrument, Basis Spread on Variable Rate	1.30%
Minimum | Term loan | Amended and Restated Credit Facility | Base Rate	'
Debt Instrument [Line Items]	'
Debt Instrument, Basis Spread on Variable Rate	0.30%
Maximum | Amended and Restated Credit Facility | Base Rate | Revolving Credit Facility	'
Debt Instrument [Line Items]	'
Debt Instrument, Basis Spread on Variable Rate	0.95%
Maximum | Line of credit | Amended and Restated Credit Facility | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility	'
Debt Instrument [Line Items]	'
Debt Instrument, Basis Spread on Variable Rate	1.95%
Maximum | Term loan | Amended and Restated Credit Facility | London Interbank Offered Rate (LIBOR)	'
Debt Instrument [Line Items]	'
Debt Instrument, Basis Spread on Variable Rate	1.90%
Maximum | Term loan | Amended and Restated Credit Facility | Base Rate	'
Debt Instrument [Line Items]	'
Debt Instrument, Basis Spread on Variable Rate	0.90%
Future Year Period Two | Line of credit	'
Debt Instrument [Line Items]	'
Minimum fixed charge coverage ratio on revolving credit facility (in percent)	1.5
Minimum Unsecured Interest Coverage Ratio	175.00%
Future Year Period Two | Line of credit | Amended and Restated Credit Facility	'
Debt Instrument [Line Items]	'
Maximum secured leverage ratio on revolving credit facility (in percent)	40.00%
Maximum Secured Leverage Ratio, Material Acquisition Period	45.00%
Future Year Period One | Line of credit | Amended and Restated Credit Facility	'
Debt Instrument [Line Items]	'
Maximum secured leverage ratio on revolving credit facility (in percent)	45.00%
Maximum Secured Leverage Ratio, Material Acquisition Period	50.00%
Interest Rate Swap | Cash Flow Hedging	'
Debt Instrument [Line Items]	'
Interest rate on derivative	3.08%

DEBT_Summary_of_Total_Secured_

DEBT Summary of Total Secured Notes Payable Outstanding (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]	'		'
Total	$961,855		$962,259
Unamortized fair value adjustment	-9,357		-10,085
Total Debt Outstanding	952,498		952,174
Period of amortization schedule (in years)	'30 years		'
Waikele Center	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	140,700	[1]	140,700	[1]
Stated Interest Rate (in percent)	5.15%	[1]	'
Stated Maturity Date	1-Nov-14	[1]	'
Shops At Kalakaua	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	19,000	[1]	19,000	[1]
Stated Interest Rate (in percent)	5.45%	[1]	'
Stated Maturity Date	1-May-15	[1]	'
The Land Mark at One Market	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	133,000	[1]	133,000	[1]
Stated Interest Rate (in percent)	5.61%	[1]	'
Stated Maturity Date	5-Jul-15	[1]	'
Del Monte Center	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	82,300	[1]	82,300	[1]
Stated Interest Rate (in percent)	4.93%	[1]	'
Stated Maturity Date	8-Jul-15	[1]	'
First And Main	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	84,500	[1]	84,500	[1]
Stated Interest Rate (in percent)	3.97%	[1]	'
Stated Maturity Date	1-Jul-16	[1]	'
Imperial Beach Gardens	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	20,000	[1]	20,000	[1]
Stated Interest Rate (in percent)	6.16%	[1]	'
Stated Maturity Date	1-Sep-16	[1]	'
Mariners Point	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	7,700	[1]	7,700	[1]
Stated Interest Rate (in percent)	6.09%	[1]	'
Stated Maturity Date	1-Sep-16	[1]	'
South Bay Marketplace	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	23,000	[1]	23,000	[1]
Stated Interest Rate (in percent)	5.48%	[1]	'
Stated Maturity Date	10-Feb-17	[1]	'
Waikiki Beach Walk - Retail	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	130,310	[1]	130,310	[1]
Stated Interest Rate (in percent)	5.39%	[1]	'
Stated Maturity Date	1-Jul-17	[1]	'
Solana Beach Corporate Centre Three To Four	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	36,691	[2]	36,804	[2]
Stated Interest Rate (in percent)	6.39%	[2]	'
Stated Maturity Date	1-Aug-17	[2]	'
Loma Palisades	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	73,744	[1]	73,744	[1]
Stated Interest Rate (in percent)	6.09%	[1]	'
Stated Maturity Date	1-Jul-18	[1]	'
One Beach Street	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	21,900	[1]	21,900	[1]
Stated Interest Rate (in percent)	3.94%	[1]	'
Stated Maturity Date	1-Apr-19	[1]	'
Torrey Reserve North Court	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	21,304	[3]	21,377	[3]
Stated Interest Rate (in percent)	7.22%	[3]	'
Stated Maturity Date	1-Jun-19	[3]	'
Torrey Reserve	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	7,175	[3]	7,200	[3]
Stated Interest Rate (in percent)	6.36%	[3]	'
Stated Maturity Date	1-Jun-20	[3]	'
Solana Beach Corporate Centre One To Two	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	11,430	[3]	11,475	[3]
Stated Interest Rate (in percent)	5.91%	[3]	'
Stated Maturity Date	1-Jun-20	[3]	'
Solana Beach Towne Centre	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	38,101	[3]	38,249	[3]
Stated Interest Rate (in percent)	5.91%	[3]	'
Stated Maturity Date	1-Jun-20	[3]	'
City Center Bellevue	'		'
Debt Instrument [Line Items]	'		'
Secured notes payable, Principal Balance	$111,000	[1]	$111,000	[1]
Stated Interest Rate (in percent)	3.98%	[1]	'
Stated Maturity Date	1-Nov-22	[1]	'
[1]	.
[2]	{F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmJlODAyOGFmMzBkODQ3YzI5MWUyNjhhNDdjZDAzYjYxfFRleHRTZWxlY3Rpb246MUJDRTBFREFENjJEMEI2QUM2RkY4RjU1Mzk1ODc0OEIM}
[3]	Principal payments based on a 30-year amortization schedule.

EQUITY_Details

EQUITY (Details) (USD $)	3 Months Ended		0 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	6-May-13	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
			At The Market Equity Program	At The Market Equity Program	Commissions	Other Offering Costs	Performance Based Restricted Stock	Restricted Stock Units (RSUs)
			Agent		At The Market Equity Program	At The Market Equity Program	Equity Incentive Award Plan 2011
Equity [Line Items]	'	'	'	'	'	'	'	'
Number of sales agents	'	'	4	'	'	'	'	'
Aggregate offering price of common share	'	'	$150,000,000	'	'	'	'	'
Common shares issued (in shares)	'	'	'	1,435,215	'	'	'	'
Weighted average price per share issued	'	'	'	$33.06	'	'	'	'
Proceeds from issuance of common stock, net	46,926,000	0	'	47,400,000	'	'	'	'
Payments of stock issuance costs	'	'	'	'	400,000	100,000	'	'
Remaining capacity to issue	'	'	'	76,600,000	'	'	'	'
Noncontrolling common units	17,905,257	'	'	'	'	'	'	'
Percentage of ownership interests classified as noncontrolling	30.10%	'	'	'	'	'	'	'
Conversion of operating partnership units (in shares)	11,852	'	'	'	'	'	'	'
Shares of restricted stock awarded	'	'	'	'	'	'	112,119	112,119
Noncash compensation expense	500,000	700,000	'	'	'	'	'	'
Unrecognized compensation expense	$4,400,000	'	'	'	'	'	'	'
Weighted average unvested shares outstanding	406,856	631,199	'	'	'	'	'	'

EQUITY_Dividends_Declare_and_P

EQUITY Dividends Declare and Paid on Shares on Common Stock and Noncontrolling Common Units (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Dividends Period	'First Quarter 2014
Amount per Share/Unit	$0.22
Dividends Period Covered	'January 1, 2014 to March 31, 2014
Dividends Date Paid	28-Mar-14

EQUITY_Summary_of_Activity_of_

EQUITY Summary of Activity of Restricted Stock Awards (Details) (Restricted Stock Units (RSUs), USD $)	3 Months Ended
	Mar. 31, 2014
Restricted Stock Units (RSUs)	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'
Nonvested, Beginning, Shares	629,058
Granted, Shares	112,119
Vested, Shares	-310,194
Forfeited, Shares	0
Nonvested, End of year, shares	430,983
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'
Nonvested, Beginning, Weighted Average Grant Date Fair Value	$15.58
Granted, Weighted Average Grant Date Fair Value	$29.96
Vested, Weighted Average Grant Date Fair Value	$15.42
Forfeited, Weighted Average Grant Date Fair Value	$0
Nonvested, End of Year, Weighted Average Grant Date Fair Value	$19.44

EQUITY_Computation_of_Basic_an

EQUITY Computation of Basic and Diluted EPS (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Equity [Abstract]	'	'
Income from continuing operations	$6,658	$4,865
Less: Net income attributable to restricted shares	-70	-132
Less: Income from continuing operations attributable to unitholders in the Operating Partnership	-1,986	-1,495
Income from continuing operations attributable to American Assets Trust, Inc. common stockholders-basic	4,602	3,238
Income from continuing operations attributable to American Assets Trust, Inc. common stockholders-basic	4,602	3,238
Net income attributable to common stockholders-diluted	$6,588	$4,733
Weighted average common shares outstanding-basic	40,582,792	39,033,013
Effect of dilutive securities-conversion of Operating Partnership units	17,909,681	18,023,435
Weighted average common shares outstanding - diluted	58,492,473	57,056,448
Earnings per common share, basic	$0.11	$0.08
Earnings per common share, diluted	$0.11	$0.08

INCOME_TAXES_Details

INCOME TAXES (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Deferred tax liability	($233)	($233)

COMMITMENTS_AND_CONTINGENCIES_1

COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
	Property
Commitment And Contingencies [Line Items]	'	'
Termination payment	$6.50	'
Percentage, partner's common units	50.00%	'
Transfer taxes accrued at time of Offering	$6.60	'
Number of consolidated properties located in Southern California	12	'
Maximum percentage of total revenue provided by any single tenant	10.00%	10.00%
The Land Mark at One Market	'	'
Commitment And Contingencies [Line Items]	'	'
Number of lease extension options	2	'
Years, lease extension options length (in years)	'5 years	'
Quicksilver	'	'
Commitment And Contingencies [Line Items]	'	'
Percent annual lease amount increase (in percent)	3.40%	'
Waikiki Beach Walk - Retail	'	'
Commitment And Contingencies [Line Items]	'	'
Property management fee, percent (in percent)	3.00%	'
Outrigger Hotels	'	'
Commitment And Contingencies [Line Items]	'	'
Property management fee, percent (in percent)	6.00%	'
Number of calendar months termination fee is based	'2 months	'
Maximum percentage of hotel's fiscal year gross revenues paid for aggregate yearly management fee	3.50%	'
Previous months of management fees	'12 months	'
Hotel management agreement default penalty factor of previous twelve months of management fees in first 11 years of term	8	'
Years in hotel management agreement term	'11 years	'
Hotel management agreement default penalty factor of previous twelve months of management fees in twelfth year of term	4	'
Hotel management agreement default penalty factor of previous twelve months of management fees in thirteenth year of term	3	'
Hotel management agreement default penalty factor of previous twelve months of management fees in fourteenth year of term	2	'
Hotel management agreement default penalty factor of previous twelve months of management fees in fifteenth year of term	1	'
Outrigger Hotels | Future Year Period One	'	'
Commitment And Contingencies [Line Items]	'	'
Years in hotel management agreement term	'15 years	'
Outrigger Hotels | Future Year Period Two	'	'
Commitment And Contingencies [Line Items]	'	'
Years in hotel management agreement term	'14 years	'
Outrigger Hotels | Future Year Period Three	'	'
Commitment And Contingencies [Line Items]	'	'
Years in hotel management agreement term	'13 years	'
Outrigger Hotels | Future Year Period Four	'	'
Commitment And Contingencies [Line Items]	'	'
Years in hotel management agreement term	'12 years	'
Outrigger Hotels | Maximum	'	'
Commitment And Contingencies [Line Items]	'	'
Property management fee, percent (in percent)	3.00%	'
Wbw Hotel Lessee Llc	'	'
Commitment And Contingencies [Line Items]	'	'
Years of contract	'20 years	'
Percentage of hotel occupancy gross revenue paid for program fee	4.00%	'
Wbw Hotel Lessee Llc | Future Time Period Prior to 12-31-2021	'	'
Commitment And Contingencies [Line Items]	'	'
Percentage of hotel occupancy gross revenue paid for franchise royalty fee	4.00%	'
Wbw Hotel Lessee Llc | Future Time Period After 12-31-2021	'	'
Commitment And Contingencies [Line Items]	'	'
Percentage of hotel occupancy gross revenue paid for franchise royalty fee	5.00%	'
Lloyd District Portfolio	'	'
Commitment And Contingencies [Line Items]	'	'
Property management fee, percent (in percent)	3.50%	'
Del Monte Center | Maximum	'	'
Commitment And Contingencies [Line Items]	'	'
Years, environmental remediation length	'10 years	'
Del Monte Center | Minimum	'	'
Commitment And Contingencies [Line Items]	'	'
Years, environmental remediation length	'2 years	'
Total Revenues | Retail	'	'
Commitment And Contingencies [Line Items]	'	'
Percentage of total revenue provided by retail tenants	36.00%	'
Total Revenues | Office	'	'
Commitment And Contingencies [Line Items]	'	'
Percentage of total revenue provided by retail tenants	35.70%	'

COMMITMENTS_AND_CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES Current Minimum Annual Payments under Leases (Details) (USD $)	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
2014 (nine months ending December 31, 2014)	$1,935,000
2015	2,636,000
2016	1,709,000
2017	736,000	[1]
2018	740,000
Thereafter	2,221,000
Total	9,977,000
Stated monthly lease rate for February 2017	$61,690
[1]	Lease payments on the Waikiki Beach Walk lease will be equal to fair rental value from March 2017 through the end of the lease term. In the table, we have shown the lease payments for this period based on the stated rate for the month of February 2017 of $61,690.

OPERATING_LEASES_Details

OPERATING LEASES (Details)	3 Months Ended
	Mar. 31, 2014
	M
Leases [Abstract]	'
Years, minimum term range of office and retail leases	'3 years
Years, maximum term range of office and retail leases	'10 years
Months, minimum term of apartment leases	'7 months
Months, maximum term of apartment leases	'15 months
Future minimum rentals term, maximum	12

OPERATING_LEASES_Minimum_Futur

OPERATING LEASES Minimum Future Rentals from Noncancelable Operating Leases (Details) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Leases [Abstract]	'
2014 (nine months ending December 31, 2014)	$116,016
2015	148,996
2016	129,347
2017	112,064
2018	79,838
Thereafter	155,343
Total	$741,604

COMPONENTS_OF_RENTAL_INCOME_AN2

COMPONENTS OF RENTAL INCOME AND EXPENSE (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating Leases, Income Statement, Lease Revenue [Abstract]	'	'
Recognition of straight-line rents	$1	$0.70
Recognition of amortization of above and below market leases	$0.60	$0.50

COMPONENTS_OF_RENTAL_INCOME_AN3

COMPONENTS OF RENTAL INCOME AND EXPENSE Component of Rental Income (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Rental Income [Line Items]	'	'
Cost reimbursement	$6,804	$5,671
Percentage rent	425	418
Hotel revenue	9,002	8,848
Other	419	431
Total rental income	60,482	59,222
Total Retail	'	'
Rental Income [Line Items]	'	'
Minimum rents	17,292	17,351
Total Office	'	'
Rental Income [Line Items]	'	'
Minimum rents	20,236	20,500
Total Multifamily	'	'
Rental Income [Line Items]	'	'
Minimum rents	3,834	3,583
Total Mixed-Use	'	'
Rental Income [Line Items]	'	'
Minimum rents	$2,470	$2,420

COMPONENTS_OF_RENTAL_INCOME_AN4

COMPONENTS OF RENTAL INCOME AND EXPENSE Components of Rental Expenses (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating Leases, Income Statement, Lease Revenue [Abstract]	'	'
Rental operating	$6,526	$6,314
Hotel operating	5,553	5,482
Repairs and maintenance	2,122	2,114
Marketing	390	352
Rent	611	613
Hawaii excise tax	965	939
Management fees	453	472
Total rental expenses	$16,620	$16,286

OTHER_INCOME_NET_Components_of

OTHER INCOME , NET Components of Other Income (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Other Income and Expenses [Abstract]	'	'
Interest and investment income	$48	$8
Income tax expense	-112	-297
Other non-operating income	0	10
Total other income (expense), net	($64)	($279)

RELATED_PARTY_TRANSACTIONS_Det

RELATED PARTY TRANSACTIONS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Related Party Transaction [Line Items]	'	'
Total rental income	$60,482,000	$59,222,000
Investment in WBW CHP LLC (in percent)	47.70%	'
ICW Plaza	'	'
Related Party Transaction [Line Items]	'	'
Total rental income	500,000	500,000
WBW CHP LLC [Member]	'	'
Related Party Transaction [Line Items]	'	'
Amount Recovered For Reimbursements Of Operating Expense For Related Party	$300,000	$200,000

SEGMENT_REPORTING_Details

SEGMENT REPORTING (Details)	3 Months Ended
	Mar. 31, 2014
	Segment
	Room
Segment Reporting [Abstract]	'
Number of operating segments	4
Room in mixed-use segment all-suite hotel	369

SEGMENT_REPORTING_Operating_Ac

SEGMENT REPORTING Operating Activity Within Reportable Segments (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]	'	'
OPERATING INCOME	$20,354	$19,880
Total Segments' profit	41,307	41,094
Total Retail	'	'
Segment Reporting Information [Line Items]	'	'
Property revenue	22,999	22,154
Property expense	-6,058	-4,971
OPERATING INCOME	16,941	17,183
Total Office	'	'
Segment Reporting Information [Line Items]	'	'
Property revenue	22,831	22,422
Property expense	-6,893	-6,436
OPERATING INCOME	15,938	15,986
Total Multifamily	'	'
Segment Reporting Information [Line Items]	'	'
Property revenue	4,130	3,875
Property expense	-1,427	-1,442
OPERATING INCOME	2,703	2,433
Total Mixed-Use	'	'
Segment Reporting Information [Line Items]	'	'
Property revenue	13,993	13,729
Property expense	-8,268	-8,237
OPERATING INCOME	$5,725	$5,492

SEGMENT_REPORTING_Reconciliati

SEGMENT REPORTING Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting [Abstract]	'	'
Total Segments' profit	$41,307	$41,094
General and administrative	-4,612	-4,201
Depreciation and amortization	-16,341	-17,013
Interest expense	13,632	14,736
Other income (expense), net	-64	-279
NET INCOME	6,658	4,865
Net income attributable to restricted shares	-70	-132
Net income attributable to unitholders in the Operating Partnership	1,986	1,495
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$4,602	$3,238

SEGMENT_REPORTING_Net_Real_Est

SEGMENT REPORTING Net Real Estate and Secured Note Payable Balances (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Segment Reporting Information [Line Items]	'		'
Net Real Estate	$1,692,929		$1,676,836
Secured Notes Payable	961,855	[1]	962,259	[1]
Unamortized fair value adjustment	9,357		10,085
Total Retail	'		'
Segment Reporting Information [Line Items]	'		'
Net Real Estate	647,816		651,707
Secured Notes Payable	303,101	[1]	303,249	[1]
Total Office	'		'
Segment Reporting Information [Line Items]	'		'
Net Real Estate	811,097		790,153
Secured Notes Payable	427,000	[1]	427,256	[1]
Total Multifamily	'		'
Segment Reporting Information [Line Items]	'		'
Net Real Estate	34,984		35,349
Secured Notes Payable	101,444	[1]	101,444	[1]
Total Mixed-Use	'		'
Segment Reporting Information [Line Items]	'		'
Net Real Estate	199,032		199,627
Secured Notes Payable	$130,310	[1]	$130,310	[1]
[1]	Excludes unamortized fair market value adjustments of $9.4 million and $10.1 million as of March 31, 2014 and December 31, 2013, respectively.

SEGMENT_REPORTING_Capital_Expe

SEGMENT REPORTING Capital Expenditures (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Segment Reporting Information [Line Items]	'		'
Capital Expenditures	$31,296	[1]	$10,240	[1]
Total Retail	'		'
Segment Reporting Information [Line Items]	'		'
Capital Expenditures	1,506	[1]	1,947	[1]
Total Office	'		'
Segment Reporting Information [Line Items]	'		'
Capital Expenditures	7,091	[1]	7,862	[1]
Total Multifamily	'		'
Segment Reporting Information [Line Items]	'		'
Capital Expenditures	21,877	[1]	143	[1]
Total Mixed-Use	'		'
Segment Reporting Information [Line Items]	'		'
Capital Expenditures	$822	[1]	$288	[1]
[1]	Capital expenditures represent cash paid for capital expenditures during the period and include leasing commissions paid.