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COMMITMENTS AND CONTINGENCIES - Current Minimum Annual Payments under Leases (Details) (USD $)
Mar. 31, 2015
Jun. 30, 2016
Feb. 28, 2017
Operating Leased Assets [Line Items]      
2015 (nine months ending December 31, 2015) $ 1,986,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 2,682,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears [1]    
2017 2,686,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears [2]    
2018 2,686,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 2,686,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 23,856,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 36,582,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Scenario, Forecast | The Land Mark at One Market      
Operating Leased Assets [Line Items]      
Stated monthly lease rate   162,140aat_StatedFutureMonthlyLeaseRate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aat_LandMarkAtOneMarketMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		  
Scenario, Forecast | Waikiki Beach Walk      
Operating Leased Assets [Line Items]      
Stated monthly lease rate     $ 61,690aat_StatedFutureMonthlyLeaseRate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aat_WaikikiBeachWalkMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
[1] Lease payments on The Landmark at One Market lease will be equal to fair rental value from July 2016 through the end of the options lease term. In the table, we have shown the option lease payments for this period based on the stated rate for the month of June 2016 of $162,140.
[2] 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.