$AAT
American Assets Trust, Inc. Stock $aat

$aat Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000150021722000011 Filed on February 11, 2022

Income Statement

Concept	2021 Q4	2021 Q3	2021 Q2
Revenue	$101.7M	$98.29M	$91.81M
YoY Change	25.08%	16.49%	11.81%
Cost Of Revenue	$36.25M	$33.11M	$30.82M
YoY Change	17.42%	7.85%	18.8%
Gross Profit	$65.50M	$65.18M	$60.99M
YoY Change	29.75%	21.43%	8.59%
Gross Profit Margin	64.37%	66.31%	66.43%
Selling, General & Admin	$9.305M	$7.297M	$7.235M
YoY Change	40.14%	5.2%	2.51%
% of Gross Profit	14.21%	11.2%	11.86%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$30.48M	$30.68M	$27.65M
YoY Change	11.24%	14.05%	4.33%
% of Gross Profit	46.53%	47.07%	45.33%
Operating Expenses	$39.78M	$7.297M	$7.235M
YoY Change	16.81%	-88.61%	-87.76%
Operating Profit	$25.72M	$27.67M	$26.42M
YoY Change	56.66%	36.15%	14.91%
Interest Expense	-$14.95M	$14.72M	$14.86M
YoY Change	12.29%	10.68%	11.48%
% of Operating Profit	-58.12%	53.21%	56.25%
Other Income/Expense, Net	-$291.0K	-$52.00K	-$74.00K
YoY Change	-142.17%	-90.21%	-145.68%
Pretax Income	$10.48M	$12.90M	$11.49M
YoY Change	176.46%	98.69%	16.86%
Income Tax		$150.0K	$174.0K
% Of Pretax Income		1.16%	1.51%
Net Earnings	$8.137M	$10.04M	$8.941M
YoY Change	180.78%	99.31%	16.78%
Net Earnings / Revenue	8.0%	10.22%	9.74%
Basic Earnings Per Share	$0.14	$0.17	$0.15
Diluted Earnings Per Share	$108.7K	$0.17	$0.15
COMMON SHARES
Basic Shares Outstanding	60.47M shares	59.99M shares	59.99M shares
Diluted Shares Outstanding		76.17M shares	76.17M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2021 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$139.5M	$171.9M	$368.3M
YoY Change	1.62%	10.7%	152.06%
Cash & Equivalents	$139.5M	$171.9M	$368.3M
Short-Term Investments
Other Short-Term Assets	$9.136M	$8.795M	$13.24M
YoY Change	5.01%	29.34%	83.89%
Inventory
Prepaid Expenses
Receivables	$7.445M	$7.421M	$6.582M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$156.1M	$188.1M	$388.1M
YoY Change	2.1%	8.06%	132.67%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.708B	$2.708B	$2.513B
YoY Change	7.38%	7.08%	-0.96%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$0.00	$2.259M	$2.361M
YoY Change	-100.0%	88.25%	-40.98%
Total Long-Term Assets	$2.862B	$2.863B	$2.657B
YoY Change	7.41%	7.23%	-0.82%
TOTAL ASSETS
Total Short-Term Assets	$156.1M	$188.1M	$388.1M
Total Long-Term Assets	$2.862B	$2.863B	$2.657B
Total Assets	$3.018B	$3.051B	$3.046B
YoY Change	7.12%	7.28%	7.0%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$64.53M	$88.85M	$80.29M
YoY Change	8.82%	23.75%	22.02%
Accrued Expenses	$27.92M	$28.46M	$28.46M
YoY Change	-7.25%	-7.01%	9.03%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$100.3M	$125.3M	$115.5M
YoY Change	4.48%	15.06%	15.94%
LONG-TERM LIABILITIES
Long-Term Debt	$1.649B	$1.649B	$1.648B
YoY Change	17.23%	17.22%	17.22%
Other Long-Term Liabilities	$57.33M	$57.78M	$54.09M
YoY Change	-5.55%	-6.96%	-15.09%
Total Long-Term Liabilities	$1.707B	$1.707B	$1.702B
YoY Change	16.29%	16.2%	15.82%
TOTAL LIABILITIES
Total Short-Term Liabilities	$100.3M	$125.3M	$115.5M
Total Long-Term Liabilities	$1.707B	$1.707B	$1.702B
Total Liabilities	$1.808B	$1.832B	$1.818B
YoY Change	15.6%	16.11%	15.84%
SHAREHOLDERS EQUITY
Retained Earnings	-$217.8M	-$207.9M	-$200.0M
YoY Change	23.35%	26.42%	29.41%
Common Stock	$1.454B	$1.451B	$1.449B
YoY Change	0.53%	0.44%	-0.41%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.239B	$1.245B	$1.251B
YoY Change
Total Liabilities & Shareholders Equity	$3.018B	$3.051B	$3.046B
YoY Change	7.12%	7.28%	7.0%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2021 Q2
OPERATING ACTIVITIES
Net Income	$8.137M	$10.04M	$8.941M
YoY Change	180.78%	99.31%	16.78%
Depreciation, Depletion And Amortization	$30.48M	$30.68M	$27.65M
YoY Change	11.24%	14.05%	4.33%
Cash From Operating Activities	$38.70M	$52.91M	$34.23M
YoY Change	116.18%	32.27%	44.41%
INVESTING ACTIVITIES
Capital Expenditures	-$47.82M	-$225.8M	-$24.13M
YoY Change	223.08%	1572.27%	64.12%
Acquisitions
YoY Change
Other Investing Activities	-$1.117M	-$497.0K	-$765.0K
YoY Change	59.57%	-50.3%	53.0%
Cash From Investing Activities	-$48.93M	-$226.3M	-$24.89M
YoY Change	215.7%	1460.37%	63.76%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-23.88M	-23.00M	-21.50M
YoY Change	20.6%	20.39%	-125.39%
NET CHANGE
Cash From Operating Activities	38.70M	52.91M	34.23M
Cash From Investing Activities	-48.93M	-226.3M	-24.89M
Cash From Financing Activities	-23.88M	-23.00M	-21.50M
Net Change In Cash	-34.11M	-196.3M	-12.17M
YoY Change	96.06%	-3167.86%	-113.05%
FREE CASH FLOW
Cash From Operating Activities	$38.70M	$52.91M	$34.23M
Capital Expenditures	-$47.82M	-$225.8M	-$24.13M
Free Cash Flow	$86.51M	$278.7M	$58.35M
YoY Change	164.57%	420.87%	51.96%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001500217
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssets
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssets
CY2021Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#DeferredCreditsAndOtherLiabilities
CY2020Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#DeferredCreditsAndOtherLiabilities
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity Registrant Name EntityRegistrantName	AMERICAN ASSETS TRUST, INC.
CY2021	dei	Entity File Number EntityFileNumber	001-35030
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-3338708
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	3420 Carmel Mountain Road
CY2021	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 100
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	San Diego
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	92121
CY2021	dei	City Area Code CityAreaCode	858
CY2021	dei	Local Phone Number LocalPhoneNumber	350-2600
CY2021	dei	Security12b Title Security12bTitle	Common Stock, $.01 par value per share
CY2021	dei	Trading Symbol TradingSymbol	AAT
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	3529371000	USD
CY2020Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	3246874000	USD
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	1971000000	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	60523831	shares
CY2021	dei	Auditor Firm AuditorFirmId	42
CY2021	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2021	dei	Auditor Location AuditorLocation	San Diego, California
CY2021Q4	us-gaap	Rental Properties RentalProperties	3389726000	USD
CY2020Q4	us-gaap	Rental Properties RentalProperties	3155280000	USD
CY2021Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	139098000	USD
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	91047000	USD
CY2021Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	547000	USD
CY2020Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	547000	USD
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	60525580	shares
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	60525580	shares
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4271000	USD
CY2021Q4	us-gaap	Secured Debt SecuredDebt	110965000	USD
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CY2020Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	754140000	USD
CY2021Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2681981000	USD
CY2020Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2492734000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	139524000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	137333000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	0	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1716000	USD
CY2021Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	7445000	USD
CY2020Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	6938000	USD
CY2021Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	82724000	USD
CY2020Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	72476000	USD
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CY2020Q4	us-gaap	Other Assets OtherAssets	106112000	USD
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CY2020Q4	us-gaap	Assets Assets	2817309000	USD
CY2020Q4	us-gaap	Secured Debt SecuredDebt	110923000	USD
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CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	490000000	shares
CY2021Q4	us-gaap	Unsecured Debt UnsecuredDebt	1538238000	USD
CY2020Q4	us-gaap	Unsecured Debt UnsecuredDebt	1196677000	USD
CY2021Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	99151000	USD
CY2021Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	64531000	USD
CY2020Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	59262000	USD
CY2021Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	7855000	USD
CY2020Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	6590000	USD
CY2021Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	86215000	USD
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CY2021Q4	us-gaap	Liabilities Liabilities	1807804000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1563903000	USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	60476292	shares
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CY2021Q4	us-gaap	Common Stock Value CommonStockValue	605000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	605000	USD
CY2021Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1453272000	USD
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CY2021	us-gaap	Profit Loss ProfitLoss	36593000	USD
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CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7966000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6496000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	12301000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	30059000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	24113000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	41012000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	802471000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	515354000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2019	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2019	us-gaap	Dividends Dividends	80605000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4477000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1338000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1293672000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	35588000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2020	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2020	us-gaap	Dividends Dividends	76510000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6307000	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	672000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1253406000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	36593000	USD
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2021	us-gaap	Dividends Dividends	88936000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8493000	USD
CY2021	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	865000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1210123000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	36593000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	35588000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2021	aat	Deferred Rent Revenue And Amortization Of Lease Intangibles DeferredRentRevenueAndAmortizationOfLeaseIntangibles	-17634000	USD
CY2020	aat	Deferred Rent Revenue And Amortization Of Lease Intangibles DeferredRentRevenueAndAmortizationOfLeaseIntangibles	-31242000	USD
CY2019	aat	Deferred Rent Revenue And Amortization Of Lease Intangibles DeferredRentRevenueAndAmortizationOfLeaseIntangibles	-6985000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	116306000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	108292000	USD
CY2021	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0	USD
CY2020	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0	USD
CY2019	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	4518000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	96205000	USD
CY2021	aat	Amortization Of Debt Issuance Costs And Debt Fair Value Adjustments AmortizationOfDebtIssuanceCostsAndDebtFairValueAdjustments	2753000	USD
CY2020	aat	Amortization Of Debt Issuance Costs And Debt Fair Value Adjustments AmortizationOfDebtIssuanceCostsAndDebtFairValueAdjustments	1477000	USD
CY2019	aat	Amortization Of Debt Issuance Costs And Debt Fair Value Adjustments AmortizationOfDebtIssuanceCostsAndDebtFairValueAdjustments	1467000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4271000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2021	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2020	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	633000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	8493000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	6307000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4477000	USD
CY2021	aat	Settlementof Forward Interest Rate Swap Agreement SettlementofForwardInterestRateSwapAgreement	0	USD
CY2020	aat	Settlementof Forward Interest Rate Swap Agreement SettlementofForwardInterestRateSwapAgreement	0	USD
CY2019	aat	Settlementof Forward Interest Rate Swap Agreement SettlementofForwardInterestRateSwapAgreement	513000	USD
CY2021	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	1098000	USD
CY2020	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	1330000	USD
CY2019	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	1304000	USD
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1314000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	695000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-4746000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-2273000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	4940000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1071000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-109000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-141000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	2420000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	15331000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-2108000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	5956000	USD
CY2021	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	443000	USD
CY2020	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	-1726000	USD
CY2019	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	-971000	USD
CY2021	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	1464000	USD
CY2020	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	-1206000	USD
CY2019	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	-3585000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	168329000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	126985000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	153816000	USD
CY2021	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	204511000	USD
CY2020	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	0	USD
CY2019	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	507780000	USD
CY2021	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	104588000	USD
CY2020	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	63488000	USD
CY2019	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	88327000	USD
CY2021	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	0	USD
CY2020	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	0	USD
CY2019	us-gaap	Interest Expense InterestExpense	54008000	USD
CY2019	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	8191000	USD
CY2021	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	3142000	USD
CY2020	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	5589000	USD
CY2019	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	11267000	USD
CY2021	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	47760000	USD
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	47723000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-312278000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-69077000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-599183000	USD
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	0	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	51003000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	20762000	USD
CY2021	us-gaap	Proceeds From Unsecured Lines Of Credit ProceedsFromUnsecuredLinesOfCredit	0	USD
CY2020	us-gaap	Proceeds From Unsecured Lines Of Credit ProceedsFromUnsecuredLinesOfCredit	100000000	USD
CY2019	us-gaap	Proceeds From Unsecured Lines Of Credit ProceedsFromUnsecuredLinesOfCredit	59000000	USD
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	100000000	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	123000000	USD
CY2021	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	155375000	USD
CY2020	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
CY2021	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	494675000	USD
CY2020	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	150000000	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5075000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	125000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1103000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	515354000	USD
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	88936000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	76510000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	80605000	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	865000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	672000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1338000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	144424000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-28310000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	497546000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	475000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	29598000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	52179000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139049000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	109451000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	57272000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139524000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139049000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	109451000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	139524000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	137333000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	99303000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	0	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1716000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10148000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139524000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139049000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	109451000	USD
CY2021Q4	dei	Entity Number Of Employees EntityNumberOfEmployees	208	Employee
CY2021Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	30	Property
CY2021Q4	aat	Real Estate Properties Held For Development RealEstatePropertiesHeldForDevelopment	3	Property
CY2021	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesThe preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, referred to as “GAAP,” requires management 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 management's best judgment, after considering past, current and expected events and economic conditions. Actual results could differ from these estimates.
CY2021	us-gaap	Interest Costs Incurred InterestCostsIncurred	61578000	USD
CY2020	us-gaap	Interest Costs Incurred InterestCostsIncurred	54510000	USD
CY2019	us-gaap	Interest Costs Incurred InterestCostsIncurred	54636000	USD
CY2021	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	2991000	USD
CY2020	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	1070000	USD
CY2019	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	628000	USD
CY2021	us-gaap	Interest Expense InterestExpense	58587000	USD
CY2020	us-gaap	Interest Expense InterestExpense	53440000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	50970000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	53467000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	51975000	USD
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	356000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	844000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	971000	USD
CY2021	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	18697000	USD
CY2020	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	22884000	USD
CY2019	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	25413000	USD
CY2021	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	2628000	USD
CY2020	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	555000	USD
CY2019	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	3345000	USD
CY2021	aat	Real Estate Owned Transferto Real Estate Ownedfrom Ground Lease Obligations RealEstateOwnedTransfertoRealEstateOwnedfromGroundLeaseObligations	0	USD
CY2020	aat	Real Estate Owned Transferto Real Estate Ownedfrom Ground Lease Obligations RealEstateOwnedTransfertoRealEstateOwnedfromGroundLeaseObligations	0	USD
CY2019	aat	Real Estate Owned Transferto Real Estate Ownedfrom Ground Lease Obligations RealEstateOwnedTransfertoRealEstateOwnedfromGroundLeaseObligations	4518000	USD
CY2021	us-gaap	Revenue Recognition Leases RevenueRecognitionLeases	<div style="margin-top:14pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Revenue Recognition and Accounts Receivable</span></div><div style="margin-top:4.5pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Our leases with tenants are classified as operating leases. Substantially all such leases contain fixed rent escalations which occur at specified times during the term of the lease. Base rents are recognized on a straight-line basis from when the tenant controls the space through the term of the related lease, based on management's assessment of credit, collection and other business risks. When we determine that we are the owner of tenant improvements and the tenant has reimbursed us for a portion or all of the tenant improvement costs, we consider the amount paid to be additional rent, which is recognized on a straight-line basis over the term of the related lease. For first generation tenants, in instances in which we fund tenant improvements and the improvements are deemed to be owned by us, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant. When we determine that the tenant is the owner of tenant improvements, tenant allowances are recorded as lease incentives and we commence revenue recognition and lease incentive amortization when possession or control of the space is turned over to the tenant for tenant work to begin. Percentage rents, which represent additional rents based upon the level of sales achieved by certain tenants, are recognized at the end of the lease year or earlier if we have determined the required sales level is achieved and the percentage rents are collectible. Real estate tax and other cost reimbursements are recognized on an accrual basis over the periods in which the related expenditures are incurred.</span></div><div style="margin-top:4.5pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Other property income includes parking income, general excise tax billed to tenants and fees charged to tenants at our multifamily properties. Other property income is recognized when we satisfy performance obligations as evidenced by the transfer of control of our services to customers. We measure other property income based on the amount of consideration we expect to be entitled to in exchange for the services provided. We recognize general excise tax gross, with the amounts billed to tenants and customers recorded in other property income and the related taxes paid as rental expense. The general excise tax included in other income was $2.5 million, $2.3 million and $3.5 million for the years ended December 31, 2021, 2020 and 2019, respectively. For a tenant to terminate its lease agreement prior to the end of the agreed term, we may require that they pay a fee to cancel the lease agreement. Lease termination fees for which the tenant has relinquished control of the space are generally recognized on the later of the termination date or the satisfaction of all conditions precedent to the lease termination, including, without limitation, payment of all lease termination fees. When a lease is terminated early but the tenant continues to control the space under a modified lease agreement, the lease termination fee is generally recognized evenly over the remaining term of the modified lease agreement. </span></div><div><span><br/></span></div><div style="text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Current accounts receivable from tenants primarily relate to contractual minimum rent and percentage rent as well as real estate tax and other cost reimbursements. Accounts receivable from straight-line rent is typically longer term in nature and relates to the cumulative amount by which straight-line rental income recorded to date exceeds cash rents billed to date under the contractual lease agreement.</span></div><div style="margin-top:9pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We recognize revenue on the hotel portion of our mixed-use property from the rental of hotel rooms and guest services when we satisfy performance obligations as evidenced by the transfer of control when the rooms are occupied and services have been provided. Food and beverage sales are recognized when the customer has been served or at the time the transaction occurs. Revenue from room rental is included in rental revenue on the statement of comprehensive income. Revenue from other sales and services provided is included in other property income on the statement of comprehensive income. </span></div><div style="margin-top:9pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We make estimates of the collectability of our current accounts receivable and straight-line rents receivable which requires significant judgment by management. The collectability of receivables is affected by numerous different factors including current economic trends, including the impact of the COVID-19 pandemic on tenant's businesses and changes in tenants' payment patterns, tenant bankruptcies, the status of collectability of current cash rents receivable, tenants' recent and historical financial and operating results, changes in our tenants' credit ratings, communications between our operating personnel and tenants, the extent of security deposits and letters of credits held with respect to tenants, and the ability of the tenant to perform under the terms of their lease agreement when evaluating the adequacy of the allowance for doubtful accounts. If our assessment of these factors indicates that it is no longer probable that we will be able to collect substantially all rents, we recognize a charge to rental income and limit our rental income to the lesser of lease income on a straight-line basis plus variable rents when they become accruable or cash collected. If we change our conclusion regarding the probability of collecting rent payments required by a lessee, we may recognize an adjustment to rental income in the period we make a change to our prior conclusion.</span></div><div style="margin-top:9pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">At December 31, 2021 and December 31, 2020, our allowance for doubtful accounts was $4.6 million and $10.0 million, respectively. Total collectability related adjustments for rental income, which includes the allowance for doubtful accounts and deferred rent receivables, was $2.3 million, $18.4 million and $1.8 million for the years ended December 31, 2021, 2020 and 2019, respectively.</span></div>During the year ended December 31, 2021, due to the impacts of the COVID-19 pandemic, we provided lease concessions to certain tenants, primarily within the retail segment, in the form of rent deferrals and abatements. We assess each lease concession and determine whether it represents a lease modifications under Accounting Standards Codification Topic 842, Leases ("ASC 842"). The Company has elected to account for such COVID-19-related concessions as lease modifications.
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	4600000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	10000000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2300000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	18400000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1800000	USD
CY2021	us-gaap	Depreciation Depreciation	102000000	USD
CY2020	us-gaap	Depreciation Depreciation	95800000	USD
CY2019	us-gaap	Depreciation Depreciation	85300000	USD
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CY2021Q4	us-gaap	Cash Fdic Insured Amount CashFDICInsuredAmount	250000	USD
CY2021Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	62200000	USD
CY2020Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	33000000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	0	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1700000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	2600000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	1200000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	0	USD
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CY2021Q4	aat	Number Of Rooms In Mixed Use Segment All Suite Hotel NumberOfRoomsInMixedUseSegmentAllSuiteHotel	369	Room
CY2021Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	58655000	USD
CY2020Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	56677000	USD
CY2021Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	36253000	USD
CY2020Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	35219000	USD
CY2021Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	22402000	USD
CY2020Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	21458000	USD
CY2021	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3200000	USD
CY2020	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3900000	USD
CY2019	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3800000	USD
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CY2021	aat	Finite Lived Intangible Liabilities Below Market Leases Renewal Options FiniteLivedIntangibleLiabilitiesBelowMarketLeasesRenewalOptions	11500000	USD
CY2021	aat	Finite Lived Intangible Liabilities Below Market Leases Weighted Average Period Before Next Renewalor Extension FiniteLivedIntangibleLiabilitiesBelowMarketLeasesWeightedAveragePeriodBeforeNextRenewalorExtension	P7Y8M12D
CY2021	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	3271000	USD
CY2020	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	3994000	USD
CY2019	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	4131000	USD
CY2021	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	3427000	USD
CY2020	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	1086000	USD
CY2019	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	976000	USD
CY2021Q4	us-gaap	Below Market Lease Amortization Income Next Twelve Months BelowMarketLeaseAmortizationIncomeNextTwelveMonths	3171000	USD
CY2021Q4	us-gaap	Below Market Lease Amortization Income Year Two BelowMarketLeaseAmortizationIncomeYearTwo	2896000	USD
CY2021Q4	us-gaap	Below Market Lease Amortization Income Year Three BelowMarketLeaseAmortizationIncomeYearThree	2581000	USD
CY2021Q4	us-gaap	Below Market Lease Amortization Income Year Four BelowMarketLeaseAmortizationIncomeYearFour	2169000	USD
CY2021Q4	us-gaap	Below Market Lease Amortization Income Year Five BelowMarketLeaseAmortizationIncomeYearFive	1767000	USD
CY2021Q4	us-gaap	Below Market Lease Amortization Income After Year Five BelowMarketLeaseAmortizationIncomeAfterYearFive	9818000	USD
CY2021Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	22402000	USD
CY2021Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	2503000	USD
CY2020Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	2059000	USD
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CY2020Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	4531000	USD
CY2021Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	40595000	USD
CY2020Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	35167000	USD
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CY2020Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	38173000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Asset Off Market Lease Favorable Gross FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross	149000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Asset Off Market Lease Favorable Gross FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross	121000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	29085000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	26207000	USD
CY2021Q4	aat	Lease Incentive Accumulated Amortization LeaseIncentiveAccumulatedAmortization	913000	USD
CY2020Q4	aat	Lease Incentive Accumulated Amortization LeaseIncentiveAccumulatedAmortization	802000	USD
CY2021Q4	us-gaap	Incentive To Lessee IncentiveToLessee	595000	USD
CY2020Q4	us-gaap	Incentive To Lessee IncentiveToLessee	994000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1382000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1213000	USD
CY2021Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	2445000	USD
CY2020Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	2565000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26254000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	29350000	USD
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CY2020Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	8702000	USD
CY2021Q4	us-gaap	Other Assets OtherAssets	106253000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	106112000	USD
CY2021Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	22402000	USD
CY2020Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	21458000	USD
CY2021Q4	us-gaap	Deferred Revenue DeferredRevenue	16309000	USD
CY2020Q4	us-gaap	Deferred Revenue DeferredRevenue	14518000	USD
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	1807000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	4531000	USD
CY2021Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	14274000	USD
CY2020Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	18049000	USD
CY2021Q4	aat	Deferred Rent Expense And Lease Intangible DeferredRentExpenseAndLeaseIntangible	3000	USD
CY2020Q4	aat	Deferred Rent Expense And Lease Intangible DeferredRentExpenseAndLeaseIntangible	16000	USD
CY2021Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	2503000	USD
CY2020Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	2059000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	967000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	570000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	27917000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	30060000	USD
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CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	39000	USD
CY2021Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	86215000	USD
CY2020Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	91300000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	211000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	150000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	100000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	200000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1000000000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	1661000000	USD
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CY2021	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	1100000	USD
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CY2019Q2	us-gaap	Option Indexed To Issuers Equity Indexed Shares OptionIndexedToIssuersEquityIndexedShares	1425000	shares
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CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
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CY2020	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	383000	USD
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CY2021	us-gaap	Restricted Stock Expense RestrictedStockExpense	8500000	USD
CY2020	us-gaap	Restricted Stock Expense RestrictedStockExpense	6300000	USD
CY2019	us-gaap	Restricted Stock Expense RestrictedStockExpense	4500000	USD
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	8200000	USD
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CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.47
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CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1000000	USD
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CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	137000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	201000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-91000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	738000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	819000	USD
CY2021	us-gaap	Loss On Contract Termination For Default LossOnContractTerminationForDefault	4000000	USD
CY2021Q4	aat	Transfer Taxes Liability TransferTaxesLiability	6600000	USD
CY2020	aat	Maximum Percentage Of Revenue Provided By Any Single Tenant MaximumPercentageOfRevenueProvidedByAnySingleTenant	0.100
CY2021	aat	Maximum Percentage Of Revenue Provided By Any Single Tenant MaximumPercentageOfRevenueProvidedByAnySingleTenant	0.100
CY2021	aat	Operating Leases Rental Period Terms OperatingLeasesRentalPeriodTerms	P12M
CY2021	aat	Number Of States NumberOfStates	5	state
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	235625000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	221814000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	190860000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	167588000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	152488000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	370926000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	1339301000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	3232000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3328000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3428000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3531000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3584000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	16126000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	33229000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	5312000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	27917000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	3926000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	3902000	USD
CY2021	us-gaap	Sublease Income SubleaseIncome	3634000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	4297000	USD
CY2021	us-gaap	Lease Cost LeaseCost	292000	USD
CY2020	us-gaap	Lease Income LeaseIncome	395000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y6M
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0319
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	2791000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	3422000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	27321000	USD
CY2021	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	4337000	USD
CY2020	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	3516000	USD
CY2019	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	2476000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	24935000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	17209000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	40297000	USD
CY2021	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	2351000	USD
CY2020	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	2185000	USD
CY2019	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	2223000	USD
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	360208000	USD
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	330312000	USD
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	343865000	USD
CY2021	us-gaap	Straight Line Rent StraightLineRent	14000000	USD
CY2020	us-gaap	Straight Line Rent StraightLineRent	18900000	USD
CY2019	us-gaap	Straight Line Rent StraightLineRent	3200000	USD
CY2021	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3200000	USD
CY2020	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3900000	USD
CY2019	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3800000	USD
CY2021	aat	Direct Costs Of Leased Property Lessor Expense DirectCostsOfLeasedPropertyLessorExpense	41488000	USD
CY2020	aat	Direct Costs Of Leased Property Lessor Expense DirectCostsOfLeasedPropertyLessorExpense	38194000	USD
CY2019	aat	Direct Costs Of Leased Property Lessor Expense DirectCostsOfLeasedPropertyLessorExpense	38331000	USD
CY2021	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	17518000	USD
CY2020	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	13691000	USD
CY2019	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	24522000	USD
CY2021	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	18113000	USD
CY2020	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	17813000	USD
CY2019	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	17035000	USD
CY2021	us-gaap	Marketing Expense MarketingExpense	1779000	USD
CY2020	us-gaap	Marketing Expense MarketingExpense	2023000	USD
CY2019	us-gaap	Marketing Expense MarketingExpense	2538000	USD
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	4023000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	3955000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	3372000	USD
CY2021	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	2792000	USD
CY2020	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	2479000	USD
CY2019	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	4160000	USD
CY2021	us-gaap	Management Fee Expense ManagementFeeExpense	1267000	USD
CY2020	us-gaap	Management Fee Expense ManagementFeeExpense	1023000	USD
CY2019	us-gaap	Management Fee Expense ManagementFeeExpense	2009000	USD
CY2021	aat	Rental Expense Operating Expense RentalExpenseOperatingExpense	86980000	USD
CY2020	aat	Rental Expense Operating Expense RentalExpenseOperatingExpense	79178000	USD
CY2019	aat	Rental Expense Operating Expense RentalExpenseOperatingExpense	91967000	USD
CY2021	aat	Percentage Of Investment In Related Party PercentageOfInvestmentInRelatedParty	0.477
CY2021	us-gaap	Interest And Other Income InterestAndOtherIncome	324000	USD
CY2020	us-gaap	Interest And Other Income InterestAndOtherIncome	436000	USD
CY2019	us-gaap	Interest And Other Income InterestAndOtherIncome	696000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	738000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	819000	USD
CY2021	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	4000	USD
CY2020	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	2000	USD
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-418000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	447000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-122000	USD
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	Segment
CY2021Q4	aat	Number Of Rooms In Mixed Use Segment All Suite Hotel NumberOfRoomsInMixedUseSegmentAllSuiteHotel	369	Room
CY2021	us-gaap	Gross Profit GrossProfit	246054000	USD
CY2020	us-gaap	Gross Profit GrossProfit	223454000	USD
CY2019	us-gaap	Gross Profit GrossProfit	234761000	USD
CY2021	us-gaap	Gross Profit GrossProfit	246054000	USD
CY2020	us-gaap	Gross Profit GrossProfit	223454000	USD
CY2019	us-gaap	Gross Profit GrossProfit	234761000	USD
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	29879000	USD
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	26581000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	24871000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	116306000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	108292000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	96205000	USD
CY2021	us-gaap	Interest Expense InterestExpense	58587000	USD
CY2020	us-gaap	Interest Expense InterestExpense	53440000	USD
CY2019	us-gaap	Interest Expense InterestExpense	54008000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4271000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2021	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2020	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	633000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-418000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	447000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-122000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	36593000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	35588000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2021	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	564000	USD
CY2020	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	383000	USD
CY2019	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	381000	USD
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	7653000	USD
CY2020	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	7545000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	14089000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	28376000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	27660000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	45718000	USD
CY2021Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2681981000	USD
CY2020Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2492734000	USD
CY2021Q4	us-gaap	Notes Payable NotesPayable	111000000	USD
CY2020Q4	us-gaap	Notes Payable NotesPayable	111000000	USD
CY2021	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	107730000	USD
CY2020	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	69077000	USD
CY2021Q4	us-gaap	Revenues Revenues	101747000	USD
CY2021Q3	us-gaap	Revenues Revenues	98286000	USD
CY2021Q2	us-gaap	Revenues Revenues	91809000	USD
CY2021Q1	us-gaap	Revenues Revenues	83986000	USD
CY2021Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	25715000	USD
CY2021Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	27669000	USD
CY2021Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	26423000	USD
CY2021Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	20062000	USD
CY2021Q4	us-gaap	Profit Loss ProfitLoss	10478000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	12895000	USD
CY2021Q2	us-gaap	Profit Loss ProfitLoss	11487000	USD
CY2021Q1	us-gaap	Profit Loss ProfitLoss	1733000	USD
CY2021Q4	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	147000	USD
CY2021Q3	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	145000	USD
CY2021Q2	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	135000	USD
CY2021Q1	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	137000	USD
CY2021Q4	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	2194000	USD
CY2021Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	2709000	USD
CY2021Q2	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	2411000	USD
CY2021Q1	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	339000	USD
CY2021Q4	us-gaap	Net Income Loss NetIncomeLoss	8137000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	10041000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	8941000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	1257000	USD
CY2021Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.14
CY2021Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.17
CY2021Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.15
CY2021Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.02
CY2020Q4	us-gaap	Revenues Revenues	81347000	USD
CY2020Q3	us-gaap	Revenues Revenues	84374000	USD
CY2020Q2	us-gaap	Revenues Revenues	82109000	USD
CY2020Q1	us-gaap	Revenues Revenues	96743000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	16415000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	20323000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	22995000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	28848000	USD
CY2020Q4	us-gaap	Profit Loss ProfitLoss	3788000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	6490000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	9826000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	15484000	USD
CY2020Q4	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	123000	USD
CY2020Q3	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	87000	USD
CY2020Q2	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	69000	USD
CY2020Q1	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	104000	USD
CY2020Q4	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	767000	USD
CY2020Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	1365000	USD
CY2020Q2	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	2101000	USD
CY2020Q1	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	3312000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	2898000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5038000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	7656000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	12068000	USD
CY2020Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.05
CY2020Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.08
CY2020Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.13
CY2020Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.20
CY2021Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	111000000	USD
CY2021Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	652608000	USD
CY2021Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	1923674000	USD
CY2021Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Carrying Costs RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts	953089000	USD
CY2021Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	687582000	USD
CY2021Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	2841789000	USD
CY2021Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	847390000	USD
CY2021Q4	srt	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	2500000000	USD
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3246874000	USD
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3188697000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2630191000	USD
CY2021	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	197754000	USD
CY2020	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	USD
CY2019	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	476421000	USD
CY2021	us-gaap	Real Estate Improvements RealEstateImprovements	93455000	USD
CY2020	us-gaap	Real Estate Improvements RealEstateImprovements	64997000	USD
CY2019	us-gaap	Real Estate Improvements RealEstateImprovements	101285000	USD
CY2021	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	0	USD
CY2020	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	0	USD
CY2019	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	8845000	USD
CY2021	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	8712000	USD
CY2020	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	6820000	USD
CY2019	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	10355000	USD
CY2021Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3529371000	USD
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3246874000	USD
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3188697000	USD
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	754140000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	665222000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	590338000	USD
CY2021	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	101962000	USD
CY2020	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	95738000	USD
CY2019	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	85428000	USD
CY2021	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	0	USD
CY2020	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	0	USD
CY2019	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	189000	USD
CY2021	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	8712000	USD
CY2020	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	6820000	USD
CY2019	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	10355000	USD
CY2021Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	847390000	USD
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	754140000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	665222000	USD

Files In Submission

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American Assets Trust, Inc. Stock $aat

2021 Q4 Form 10-K Financial Statement

#000150021722000011 Filed on February 11, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AAT American Assets Trust, Inc. Stock $aat

2021 Q4 Form 10-K Financial Statement

#000150021722000011 Filed on February 11, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AAT
American Assets Trust, Inc. Stock $aat