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Real Estate Summary of Real Estate Investments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Real Estate Properties [Line Items]    
Construction in progress $ 195,736us-gaap_ConstructionInProgressGross $ 67,389us-gaap_ConstructionInProgressGross
Total Real estate, at cost 2,136,824us-gaap_RealEstateInvestmentPropertyAtCost 1,995,417us-gaap_RealEstateInvestmentPropertyAtCost
Accumulated depreciation (361,424)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation (318,581)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Net real estate 1,775,400us-gaap_RealEstateInvestmentPropertyNet 1,676,836us-gaap_RealEstateInvestmentPropertyNet
Total Retail    
Real Estate Properties [Line Items]    
Net real estate 639,456us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
651,707us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
Total Office    
Real Estate Properties [Line Items]    
Net real estate 757,854us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
750,890us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
Total Multifamily    
Real Estate Properties [Line Items]    
Net real estate 182,468us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
74,612us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
Total Mixed-Use    
Real Estate Properties [Line Items]    
Net real estate 195,622us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
199,627us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
Real Estate Investment    
Real Estate Properties [Line Items]    
Land 494,103us-gaap_Land
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
493,725us-gaap_Land
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Buildings 1,289,499us-gaap_BuildingsAndImprovementsGross
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
1,282,580us-gaap_BuildingsAndImprovementsGross
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Land improvements 53,720us-gaap_LandImprovements
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
52,793us-gaap_LandImprovements
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Tenant improvements 108,310us-gaap_TenantImprovements
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
99,362us-gaap_TenantImprovements
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Furniture, fixtures, and equipment 12,456us-gaap_FurnitureAndFixturesGross
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
16,568us-gaap_FurnitureAndFixturesGross
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Construction in progress 178,736us-gaap_ConstructionInProgressGross
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
[1] 50,389us-gaap_ConstructionInProgressGross
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
[1]
Total Real estate, at cost 2,136,824us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
1,995,417us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Accumulated depreciation (361,424)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
(318,581)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Net real estate 1,775,400us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
1,676,836us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Real Estate Investment | Total Retail    
Real Estate Properties [Line Items]    
Land 248,386us-gaap_Land
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
248,008us-gaap_Land
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Buildings 500,088us-gaap_BuildingsAndImprovementsGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
499,091us-gaap_BuildingsAndImprovementsGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Land improvements 39,999us-gaap_LandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
39,892us-gaap_LandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Tenant improvements 50,504us-gaap_TenantImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
46,649us-gaap_TenantImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Furniture, fixtures, and equipment 491us-gaap_FurnitureAndFixturesGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
489us-gaap_FurnitureAndFixturesGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Construction in progress 5,327us-gaap_ConstructionInProgressGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
2,673us-gaap_ConstructionInProgressGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Total Real estate, at cost 844,795us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
836,802us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Accumulated depreciation (205,339)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
(185,095)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Net real estate 639,456us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
651,707us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_RetailMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Real Estate Investment | Total Office    
Real Estate Properties [Line Items]    
Land 143,575us-gaap_Land
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
143,575us-gaap_Land
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Buildings 621,343us-gaap_BuildingsAndImprovementsGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
618,077us-gaap_BuildingsAndImprovementsGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Land improvements 8,273us-gaap_LandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
7,528us-gaap_LandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Tenant improvements 56,127us-gaap_TenantImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
51,016us-gaap_TenantImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Furniture, fixtures, and equipment 750us-gaap_FurnitureAndFixturesGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
517us-gaap_FurnitureAndFixturesGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Construction in progress 31,878us-gaap_ConstructionInProgressGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
14,189us-gaap_ConstructionInProgressGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Total Real estate, at cost 861,946us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
834,902us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Accumulated depreciation (104,092)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
(84,012)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Net real estate 757,854us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
750,890us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_OfficeMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Real Estate Investment | Total Multifamily    
Real Estate Properties [Line Items]    
Land 25,507us-gaap_Land
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
25,507us-gaap_Land
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Buildings 42,270us-gaap_BuildingsAndImprovementsGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
42,270us-gaap_BuildingsAndImprovementsGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Land improvements 3,085us-gaap_LandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
3,010us-gaap_LandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Tenant improvements 0us-gaap_TenantImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
0us-gaap_TenantImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Furniture, fixtures, and equipment 5,832us-gaap_FurnitureAndFixturesGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
5,482us-gaap_FurnitureAndFixturesGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Construction in progress 141,205us-gaap_ConstructionInProgressGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
32,252us-gaap_ConstructionInProgressGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Total Real estate, at cost 217,899us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
108,521us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Accumulated depreciation (35,431)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
(33,909)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Net real estate 182,468us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
74,612us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MultiFamilyMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Real Estate Investment | Total Mixed-Use    
Real Estate Properties [Line Items]    
Land 76,635us-gaap_Land
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
76,635us-gaap_Land
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Buildings 125,798us-gaap_BuildingsAndImprovementsGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
123,142us-gaap_BuildingsAndImprovementsGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Land improvements 2,363us-gaap_LandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
2,363us-gaap_LandImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Tenant improvements 1,679us-gaap_TenantImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
1,697us-gaap_TenantImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Furniture, fixtures, and equipment 5,383us-gaap_FurnitureAndFixturesGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
10,080us-gaap_FurnitureAndFixturesGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Construction in progress 326us-gaap_ConstructionInProgressGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
1,275us-gaap_ConstructionInProgressGross
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Total Real estate, at cost 212,184us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
215,192us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Accumulated depreciation (16,562)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
(15,565)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
Net real estate $ 195,622us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
$ 199,627us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementBusinessSegmentsAxis
= aat_MixedUseMember
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_RealEstateInvestmentMember
[1] Land related to held for development and construction in progress is included in the Held for Development and Construction in Progress classifications on the consolidated balance sheets.