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v3.25.3

REAL ESTATE - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Real Estate [Line Items] |  |
TOTAL ASSETS | $ 2,942,055 | $ 3,273,365
Security deposits payable | (9,323) | (8,896)
Other liabilities and deferred credits | (61,705) | (62,588)
Liabilities assumed | (1,827,664) | $ (2,149,044)
Apartment Building | Genesee Park |  |
Real Estate [Line Items] |  |
Land | 27,125 |
Building | 38,101 |
Land improvements | 1,156 |
Furniture, fixtures, and equipment | 274 |
Total real estate | 66,656 |
Lease intangibles | 1,373 |
Prepaid expenses and other assets | 114 |
TOTAL ASSETS | 68,143 |
Security deposits payable | (236) |
Other liabilities and deferred credits | (28) |
Liabilities assumed | $ (264) |

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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing. + References No definition available. + Details
Name: | us-gaap_SecurityDepositLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_ApartmentBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=aat_GeneseeParkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |