$AAT
American Assets Trust, Inc. Stock $aat

$aat Overview Financials Valuation SEC Filings Company Website

2020 Form 10-K Financial Statement

#000150021721000008 Filed on February 16, 2021

Income Statement

Concept	2020	2019 Q4	2019 Q3
Revenue	$344.6M	$98.95M	$98.36M
YoY Change	-6.04%	19.78%	19.22%
Cost Of Revenue	$121.1M	$36.11M	$34.93M
YoY Change	-8.26%	10.06%	15.78%
Gross Profit	$223.5M	$62.84M	$63.43M
YoY Change	-4.82%	26.18%	21.2%
Gross Profit Margin	64.85%	63.51%	64.49%
Selling, General & Admin	$28.60M	$6.380M	$7.110M
YoY Change	4.36%	-4.06%	25.66%
% of Gross Profit	12.8%	10.15%	11.21%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$108.3M	$26.50M	$26.50M
YoY Change	12.56%	25.59%	33.17%
% of Gross Profit	48.46%	42.17%	41.78%
Operating Expenses	$256.0M	$32.84M	$67.98M
YoY Change	1.16%	18.56%	23.08%
Operating Profit	$88.58M	$29.99M	$30.38M
YoY Change	-22.08%	35.77%	11.4%
Interest Expense	$53.44M	-$13.40M	$13.73M
YoY Change	-1.05%	4.44%	6.64%
% of Operating Profit	60.33%	-44.68%	45.2%
Other Income/Expense, Net	$447.0K	-$110.0K	-$131.0K
YoY Change	-466.39%	120.0%	4.8%
Pretax Income	$35.60M	$16.49M	$16.52M
YoY Change	-40.86%	79.04%	15.77%
Income Tax	-$9.000K		$268.0K
% Of Pretax Income	-0.03%		1.62%
Net Earnings	$27.66M	$12.85M	$12.86M
YoY Change	-39.5%	92.49%	23.74%
Net Earnings / Revenue	8.03%	12.98%	13.08%
Basic Earnings Per Share	$0.46		$0.22
Diluted Earnings Per Share	$0.46	$170.1K	$0.22
COMMON SHARES
Basic Shares Outstanding	59.81M shares	59.96M shares	59.44M shares
Diluted Shares Outstanding	76.12M shares		75.83M shares

Balance Sheet

Concept	2020	2019 Q4	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$137.3M	$99.30M	$115.6M
YoY Change	38.27%	106.88%	105.69%
Cash & Equivalents	$137.3M	$99.30M	$115.6M
Short-Term Investments
Other Short-Term Assets	$8.700M	$7.200M	$6.700M
YoY Change	20.83%	7.46%	13.56%
Inventory
Prepaid Expenses
Receivables	$6.900M	$12.00M	$9.600M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$152.9M	$118.5M	$131.9M
YoY Change	29.03%	85.16%	87.36%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.522B	$2.528B	$2.520B
YoY Change	-0.25%	23.94%	23.79%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$1.700M	$10.10M	$10.50M
YoY Change	-83.17%	8.6%	6.06%
Total Long-Term Assets	$2.664B	$2.672B	$2.657B
YoY Change	-0.28%	25.19%	24.96%
TOTAL ASSETS
Total Short-Term Assets	$152.9M	$118.5M	$131.9M
Total Long-Term Assets	$2.664B	$2.672B	$2.657B
Total Assets	$2.817B	$2.790B	$2.789B
YoY Change	0.97%	26.93%	26.96%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$59.30M	$62.60M	$63.20M
YoY Change	-5.27%	34.33%	15.75%
Accrued Expenses	$30.10M	$5.400M	$6.200M
YoY Change	457.41%
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	$96.00M	$76.30M	$77.30M
YoY Change	25.82%	37.73%	22.12%
LONG-TERM LIABILITIES
Long-Term Debt	$1.407B	$1.358B	$1.358B
YoY Change	3.62%	5.18%	6.85%
Other Long-Term Liabilities	$60.70M	$62.40M	$55.70M
YoY Change	-2.72%	26.06%	18.01%
Total Long-Term Liabilities	$1.468B	$1.420B	$1.413B
YoY Change	3.34%	5.95%	7.25%
TOTAL LIABILITIES
Total Short-Term Liabilities	$96.00M	$76.30M	$77.30M
Total Long-Term Liabilities	$1.468B	$1.420B	$1.413B
Total Liabilities	$1.546B	$1.497B	$1.491B
YoY Change	4.71%	7.23%	7.92%
SHAREHOLDERS EQUITY
Retained Earnings		-$144.4M	-$139.3M
YoY Change		12.11%	13.91%
Common Stock		$1.453B	$1.451B
YoY Change		57.7%	57.63%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.271B	$1.314B	$1.317B
YoY Change
Total Liabilities & Shareholders Equity	$2.817B	$2.790B	$2.789B
YoY Change	0.97%	26.93%	26.96%

Cashflow Statement

Concept	2020	2019 Q4	2019 Q3
OPERATING ACTIVITIES
Net Income	$27.66M	$12.85M	$12.86M
YoY Change	-39.5%	92.49%	23.74%
Depreciation, Depletion And Amortization	$108.3M	$26.50M	$26.50M
YoY Change	12.56%	25.59%	33.17%
Cash From Operating Activities	$127.0M	$31.70M	$51.90M
YoY Change	-17.44%	80.11%	41.8%
INVESTING ACTIVITIES
Capital Expenditures	-$63.50M	-$22.80M	-$17.70M
YoY Change	-89.35%	0.44%	56.64%
Acquisitions
YoY Change
Other Investing Activities	-$5.600M	-$2.400M	-$6.300M
YoY Change	80.65%	-50.0%	215.0%
Cash From Investing Activities	-$69.08M	-$25.20M	-$23.90M
YoY Change	-88.47%	-8.36%	78.36%
FINANCING ACTIVITIES
Cash Dividend Paid	$76.51M
YoY Change	-5.08%
Common Stock Issuance & Retirement, Net	$0.00
YoY Change	-100.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$28.31M	-23.20M	43.60M
YoY Change	-105.69%	-2209.09%	-346.33%
NET CHANGE
Cash From Operating Activities	$127.0M	31.70M	51.90M
Cash From Investing Activities	-$69.08M	-25.20M	-23.90M
Cash From Financing Activities	-$28.31M	-23.20M	43.60M
Net Change In Cash	$29.60M	-16.70M	71.60M
YoY Change	-43.28%	89.77%	1201.82%
FREE CASH FLOW
Cash From Operating Activities	$127.0M	$31.70M	$51.90M
Capital Expenditures	-$63.50M	-$22.80M	-$17.70M
Free Cash Flow	$190.5M	$54.50M	$69.60M
YoY Change	-74.6%	35.24%	45.3%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Trading Symbol TradingSymbol	AAT
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001500217
CY2019Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:DeferredCreditsAndOtherLiabilities
CY2020Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:DeferredCreditsAndOtherLiabilities
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity Registrant Name EntityRegistrantName	AMERICAN ASSETS TRUST, INC.
CY2020	dei	Entity File Number EntityFileNumber	001-35030
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-3338708
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	11455 El Camino Real
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 200
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	San Diego
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	92130
CY2020	dei	City Area Code CityAreaCode	858
CY2020	dei	Local Phone Number LocalPhoneNumber	350-2600
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $.01 par value per share
CY2020	dei	Trading Symbol TradingSymbol	AAT
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	1478000000	USD
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CY2020Q4	us-gaap	Rental Properties RentalProperties	3155280000	USD
CY2019Q4	us-gaap	Rental Properties RentalProperties	3096886000	USD
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	91047000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	91264000	USD
CY2020Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	547000	USD
CY2019Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	547000	USD
CY2020Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	3246874000	USD
CY2019Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	3188697000	USD
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CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	844144000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2018	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2018	us-gaap	Dividends Dividends	70228000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3039000	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	527000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1279000	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
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1304000	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
CY2020	us-gaap	Profit Loss ProfitLoss	35588000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	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
CY2018	aat	Deferred Rent Revenue And Amortization Of Lease Intangibles DeferredRentRevenueAndAmortizationOfLeaseIntangibles	-1157000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	108292000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	96205000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	107093000	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
CY2018	aat	Amortization Of Debt Issuance Costs And Debt Fair Value Adjustments AmortizationOfDebtIssuanceCostsAndDebtFairValueAdjustments	1530000	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
CY2018	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	6307000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4477000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	3039000	USD
CY2020	aat	Settlementof Forward Interest Rate Swap Agreement SettlementofForwardInterestRateSwapAgreement	0	USD
CY2019	aat	Settlementof Forward Interest Rate Swap Agreement SettlementofForwardInterestRateSwapAgreement	513000	USD
CY2018	aat	Settlementof Forward Interest Rate Swap Agreement SettlementofForwardInterestRateSwapAgreement	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
CY2018	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0	USD
CY2020	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	1330000	USD
CY2019	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	1304000	USD
CY2018	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	1279000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	695000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-4746000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	407000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	4940000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1071000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	336000	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
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	227000	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
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-3297000	USD
CY2020	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	-1726000	USD
CY2019	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	-971000	USD
CY2018	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	2274000	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
CY2018	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	1282000	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
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	136507000	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
CY2018	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	0	USD
CY2020	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	63488000	USD
CY2019	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	88327000	USD
CY2018	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	54411000	USD
CY2020	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	0	USD
CY2019	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	8191000	USD
CY2018	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	0	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
CY2018	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	9936000	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
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-64347000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	51003000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	20762000	USD
CY2018	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	97124000	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
CY2018	us-gaap	Proceeds From Unsecured Lines Of Credit ProceedsFromUnsecuredLinesOfCredit	84000000	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	123000000	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	20000000	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
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	125000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1103000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2727000	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
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-236000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	76510000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	80605000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	70228000	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
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	527000	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
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-106842000	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
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-34682000	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
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	91954000	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
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
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47956000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1716000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10148000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	9316000	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
CY2020Q4	dei	Entity Number Of Employees EntityNumberOfEmployees	189	Employee
CY2020Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	28	Property
CY2020Q4	aat	Real Estate Properties Held For Development RealEstatePropertiesHeldForDevelopment	3	Property
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	844000	USD
CY2020	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.
CY2020	us-gaap	Interest Costs Incurred InterestCostsIncurred	54510000	USD
CY2019	us-gaap	Interest Costs Incurred InterestCostsIncurred	54636000	USD
CY2018	us-gaap	Interest Costs Incurred InterestCostsIncurred	53736000	USD
CY2020	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	1070000	USD
CY2019	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	628000	USD
CY2018	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	1488000	USD
CY2020	us-gaap	Interest Expense InterestExpense	53440000	USD
CY2019	us-gaap	Interest Expense InterestExpense	54008000	USD
CY2018	us-gaap	Interest Expense InterestExpense	52248000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	53467000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	51975000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	52632000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	971000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	462000	USD
CY2020	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	22884000	USD
CY2019	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	25413000	USD
CY2018	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	14440000	USD
CY2020	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	555000	USD
CY2019	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	3345000	USD
CY2018	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	5229000	USD
CY2020	aat	Reductionto Capitalfor Prepaid Offering Costs ReductiontoCapitalforPrepaidOfferingCosts	0	USD
CY2019	aat	Reductionto Capitalfor Prepaid Offering Costs ReductiontoCapitalforPrepaidOfferingCosts	0	USD
CY2018	aat	Reductionto Capitalfor Prepaid Offering Costs ReductiontoCapitalforPrepaidOfferingCosts	241000	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
CY2018	aat	Real Estate Owned Transferto Real Estate Ownedfrom Ground Lease Obligations RealEstateOwnedTransfertoRealEstateOwnedfromGroundLeaseObligations	0	USD
CY2020	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 $2.3 million, $3.5 million and $3.6 million for the years ended December 31, 2020, 2019 and 2018, 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 income. Revenue from other sales and services provided is included in other property income on the statement of 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, 2020 and December 31, 2019, our allowance for doubtful accounts was $10.0 million and $1.2 million, respectively. Total collectability related adjustments for rental income, which includes the our allowance for doubtful accounts and deferred rent receivables, was $18.4 million, $1.8 million and $0.8 million for the years ended December 31, 2020, 2019 and 2018, respectively. Total collectability related adjustments for the years ended December 31, 2020 and 2019 were included as a reduction to rental income on the consolidated statements of comprehensive income while the total collectability related adjustments for the years ended December 31, 2018 were included in rental expenses on the consolidated statements of comprehensive income. </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:115%">During the year ended December 31, 2020, we provided lease concessions to certain tenants, primarily within the retail segment, as a result of the COVID-19 pandemic, in the form of rent deferrals and abatements. These lease concessions generally included an increase in our rights as a lessor. We assess each lease concession and determine whether it represents a lease modifications under Accounting Standards Codification Topic 842, Leases ("ASC 842"). The FASB staff provided guidance that it would be acceptable for entities to make an election to account for lease concessions related to the effects of the COVID-19 pandemic consistent with how those concessions would be accounted for under ASC 842 as though enforceable rights and obligations for those concessions existed in the existing lease contract, as long as the concession does not result in a substantial increase in the rights of the lessor or the obligations of the lessee, thereby not requiring entities to apply lease modification guidance to those contracts. The Company has elected to account for such COVID-19 concessions as lease modifications. As of December 31, 2020, we have entered into lease modifications that resulted in adjustments (including rent deferrals and other monetary lease concessions) believed to be caused by the COVID-19 pandemic for approximately $13.4 million or 4% of the rent originally contracted for the year ended December 31, 2020.</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%">Effective January 1, 2018, (upon the adoption of ASU 2014-09, </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Revenue from Contracts with Customers</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">) sales of real estate are recognized generally upon the transfer of control, which usually occurs when the real estate is legally sold. Prior to January 1, 2018, sales of real estate were recognized only when sufficient down payments had been obtained, possession and other attributes of ownership had been transferred to the buyer and we had no significant continuing involvement. The application of these criteria can be complex and required us to make assumptions. We believe the relevant criteria were met for all real estate sold during the periods presented.</span></div>
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	10000000.0	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1200000	USD
CY2019Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	36200000	USD
CY2020	aat	Cash Equivalents Maturity Period CashEquivalentsMaturityPeriod	P3M
CY2020Q4	us-gaap	Cash Fdic Insured Amount CashFDICInsuredAmount	250000	USD
CY2020Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	33000000.0	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1700000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	18400000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1800000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	800000	USD
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CY2020	aat	Rent Concessions Covid19 Percentage RentConcessionsCOVID19Percentage	0.04
CY2020	us-gaap	Depreciation Depreciation	95800000	USD
CY2019	us-gaap	Depreciation Depreciation	85300000	USD
CY2018	us-gaap	Depreciation Depreciation	99600000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10100000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	1200000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	0	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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CY2020	aat	Lease Practical Expedient Leaseand Nonlease Components LeasePracticalExpedientLeaseandNonleaseComponents	37600000	USD
CY2019	aat	Lease Practical Expedient Leaseand Nonlease Components LeasePracticalExpedientLeaseandNonleaseComponents	38400000	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7700000	USD
CY2019Q1	us-gaap	Deferred Rent Credit DeferredRentCredit	800000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	36400000	USD
CY2019	us-gaap	Revenues Revenues	366741000	USD
CY2018	us-gaap	Revenues Revenues	330867000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	5600000	USD
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CY2019	us-gaap	Operating Expenses OperatingExpenses	253056000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	251332000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	113685000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	79535000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	USD
CY2020Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	56677000	USD
CY2019Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	62126000	USD
CY2020Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	35219000	USD
CY2019Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	36674000	USD
CY2020Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	21458000	USD
CY2019Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	25452000	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
CY2018	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3600000	USD
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CY2020	aat	Acquired Finite Lived Intangible Liabilities Below Market Leases Weighted Average Period Before Renewalor Extension AcquiredFiniteLivedIntangibleLiabilitiesBelowMarketLeasesWeightedAveragePeriodBeforeRenewalorExtension	P11Y3M18D
CY2020	aat	Finite Lived Intangible Liabilities Below Market Leases Renewal Options FiniteLivedIntangibleLiabilitiesBelowMarketLeasesRenewalOptions	10500000	USD
CY2020	aat	Finite Lived Intangible Liabilities Below Market Leases Weighted Average Period Before Next Renewalor Extension FiniteLivedIntangibleLiabilitiesBelowMarketLeasesWeightedAveragePeriodBeforeNextRenewalorExtension	P9Y4M24D
CY2020	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	3994000	USD
CY2019	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	4131000	USD
CY2018	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	4230000	USD
CY2020	us-gaap	Amortization Of Leased Asset AmortizationOfLeasedAsset	1086000	USD
CY2019	us-gaap	Amortization Of Leased Asset AmortizationOfLeasedAsset	976000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Next Twelve Months BelowMarketLeaseAmortizationIncomeNextTwelveMonths	3035000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Year Two BelowMarketLeaseAmortizationIncomeYearTwo	2467000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Year Three BelowMarketLeaseAmortizationIncomeYearThree	2232000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Year Four BelowMarketLeaseAmortizationIncomeYearFour	1932000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Year Five BelowMarketLeaseAmortizationIncomeYearFive	1564000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income After Year Five BelowMarketLeaseAmortizationIncomeAfterYearFive	10228000	USD
CY2020Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	21458000	USD
CY2020Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	2059000	USD
CY2019Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	1669000	USD
CY2020Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	0	USD
CY2019Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	434000	USD
CY2020Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	4531000	USD
CY2019Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	1317000	USD
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CY2019Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	30775000	USD
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CY2019Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	42539000	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	0	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	434000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Asset Off Market Lease Favorable Gross FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross	121000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Asset Off Market Lease Favorable Gross FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross	183000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	26207000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	31224000	USD
CY2020Q4	aat	Lease Incentive Accumulated Amortization LeaseIncentiveAccumulatedAmortization	802000	USD
CY2019Q4	aat	Lease Incentive Accumulated Amortization LeaseIncentiveAccumulatedAmortization	565000	USD
CY2020Q4	us-gaap	Incentive To Lessee IncentiveToLessee	994000	USD
CY2019Q4	us-gaap	Incentive To Lessee IncentiveToLessee	2603000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1213000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1031000	USD
CY2020Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	2565000	USD
CY2019Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	2893000	USD
CY2020Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	0	USD
CY2019Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	814000	USD
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CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	1256000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	29350000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4863000	USD
CY2020Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	8702000	USD
CY2019Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	7225000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	106112000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	93220000	USD
CY2020Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	21458000	USD
CY2019Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	25452000	USD
CY2020Q4	us-gaap	Deferred Revenue DeferredRevenue	14518000	USD
CY2019Q4	us-gaap	Deferred Revenue DeferredRevenue	16969000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	4531000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	1317000	USD
CY2020Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	18049000	USD
CY2019Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	16903000	USD
CY2020Q4	aat	Deferred Rent Expense And Lease Intangible DeferredRentExpenseAndLeaseIntangible	16000	USD
CY2019Q4	aat	Deferred Rent Expense And Lease Intangible DeferredRentExpenseAndLeaseIntangible	28000	USD
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CY2019Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1669000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	570000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	332000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	30060000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	5380000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	39000	USD
CY2019Q4	us-gaap	Other Liabilities OtherLiabilities	60000	USD
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CY2019Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	68110000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	150000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	211000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	150000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	100000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	200000000	USD
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CY2020Q4	us-gaap	Long Term Debt LongTermDebt	1311000000	USD
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CY2020	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	1300000	USD
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CY2019Q2	us-gaap	Option Indexed To Issuers Equity Indexed Shares OptionIndexedToIssuersEquityIndexedShares	1425000	shares
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CY2019	aat	Capital Gain Dividends Per Share CapitalGainDividendsPerShare	0
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CY2018	aat	Capital Gain Dividends Per Share CapitalGainDividendsPerShare	0
CY2018	aat	Capital Gain Dividends Percentage CapitalGainDividendsPercentage	0
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CY2019	aat	Return Of Capital Dividends Per Share ReturnOfCapitalDividendsPerShare	0.05
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CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.14
CY2019	aat	Common Stock Dividend Rate Percentage CommonStockDividendRatePercentage	1.000
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CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	4054411	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2477277	shares
CY2020	us-gaap	Restricted Stock Expense RestrictedStockExpense	6300000	USD
CY2019	us-gaap	Restricted Stock Expense RestrictedStockExpense	4500000	USD
CY2018	us-gaap	Restricted Stock Expense RestrictedStockExpense	3000000.0	USD
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	8400000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	35588000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	60188000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	27202000	USD
CY2020	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	383000	USD
CY2019	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	381000	USD
CY2018	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	311000	USD
CY2020	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-7545000	USD
CY2019	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-14089000	USD
CY2018	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-7205000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	27660000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	45718000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	19686000	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
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	19686000	USD
CY2020	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-7545000	USD
CY2019	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-14089000	USD
CY2018	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-7205000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	35205000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	59807000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	26891000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59806309	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	54110949	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46950812	shares
CY2020	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	16313454	shares
CY2019	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	16675183	shares
CY2018	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	17185747	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	76119763	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	70786132	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64136559	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.46
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.84
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.46
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	600000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	300000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	300000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-542000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	48000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	60000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	412000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	625000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	465000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-80000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	237000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-6000	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
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-192000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	819000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	327000	USD
CY2020	us-gaap	Loss On Contract Termination For Default LossOnContractTerminationForDefault	5500000	USD
CY2020Q4	aat	Transfer Taxes Liability TransferTaxesLiability	6600000	USD
CY2019	aat	Maximum Percentage Of Revenue Provided By Any Single Tenant MaximumPercentageOfRevenueProvidedByAnySingleTenant	0.100
CY2020	aat	Maximum Percentage Of Revenue Provided By Any Single Tenant MaximumPercentageOfRevenueProvidedByAnySingleTenant	0.100
CY2020	aat	Operating Leases Rental Period Terms OperatingLeasesRentalPeriodTerms	P12M
CY2020	aat	Number Of States NumberOfStates	5	state
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	222357000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	210536000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	192702000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	163025000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	142446000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	435100000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	1366166000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	3215000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3232000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3328000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3428000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3531000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	19710000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	36444000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	6384000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	30060000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	3902000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	3334000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	4297000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	3098000	USD
CY2020	us-gaap	Lease Income LeaseIncome	395000	USD
CY2019	us-gaap	Lease Cost LeaseCost	236000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y2M12D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0322
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	3422000	USD
CY2019	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	2223000	USD
CY2018	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	1611000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	3347000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	27321000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	7661000	USD
CY2020	aat	Tenant Reimbursements Lease Revenue TenantReimbursementsLeaseRevenue	0	USD
CY2019	aat	Tenant Reimbursements Lease Revenue TenantReimbursementsLeaseRevenue	0	USD
CY2018	aat	Tenant Reimbursements Lease Revenue TenantReimbursementsLeaseRevenue	34584000	USD
CY2020	us-gaap	Percentage Rent PercentageRent	3516000	USD
CY2019	us-gaap	Percentage Rent PercentageRent	2476000	USD
CY2018	us-gaap	Percentage Rent PercentageRent	3149000	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
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	40049000	USD
CY2020	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	2185000	USD
CY2020	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	330312000	USD
CY2019	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	343865000	USD
CY2018	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	309537000	USD
CY2020	us-gaap	Straight Line Rent StraightLineRent	18900000	USD
CY2019	us-gaap	Straight Line Rent StraightLineRent	3200000	USD
CY2018	us-gaap	Straight Line Rent StraightLineRent	-2400000	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
CY2018	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3600000	USD
CY2020	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	38194000	USD
CY2019	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	38331000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	37322000	USD
CY2020	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	13691000	USD
CY2019	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	24522000	USD
CY2018	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	24030000	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
CY2018	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	13486000	USD
CY2020	us-gaap	Marketing Expense MarketingExpense	2023000	USD
CY2019	us-gaap	Marketing Expense MarketingExpense	2538000	USD
CY2018	us-gaap	Marketing Expense MarketingExpense	2108000	USD
CY2020	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3955000	USD
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3372000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3216000	USD
CY2020	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	2479000	USD
CY2019	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	4160000	USD
CY2018	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	4333000	USD
CY2020	us-gaap	Management Fee Expense ManagementFeeExpense	1023000	USD
CY2019	us-gaap	Management Fee Expense ManagementFeeExpense	2009000	USD
CY2018	us-gaap	Management Fee Expense ManagementFeeExpense	1987000	USD
CY2020	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	79178000	USD
CY2019	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	91967000	USD
CY2018	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	86482000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-122000	USD
CY2020	us-gaap	Interest And Other Income InterestAndOtherIncome	436000	USD
CY2019	us-gaap	Interest And Other Income InterestAndOtherIncome	696000	USD
CY2018	us-gaap	Interest And Other Income InterestAndOtherIncome	238000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	819000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	327000	USD
CY2020	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	2000	USD
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1000	USD
CY2018	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	4000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	447000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-85000	USD
CY2020	aat	Percentage Of Investment In Related Party PercentageOfInvestmentInRelatedParty	0.477
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	Segment
CY2020Q4	aat	Number Of Rooms In Mixed Use Segment All Suite Hotel NumberOfRoomsInMixedUseSegmentAllSuiteHotel	369	Room
CY2020	us-gaap	Gross Profit GrossProfit	223454000	USD
CY2019	us-gaap	Gross Profit GrossProfit	234761000	USD
CY2018	us-gaap	Gross Profit GrossProfit	209412000	USD
CY2020	us-gaap	Gross Profit GrossProfit	223454000	USD
CY2019	us-gaap	Gross Profit GrossProfit	234761000	USD
CY2018	us-gaap	Gross Profit GrossProfit	209412000	USD
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	26581000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	24871000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	22784000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	108292000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	96205000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	107093000	USD
CY2020	us-gaap	Interest Expense InterestExpense	53440000	USD
CY2019	us-gaap	Interest Expense InterestExpense	54008000	USD
CY2018	us-gaap	Interest Expense InterestExpense	52248000	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
CY2018	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	447000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-122000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-85000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	35588000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	USD
CY2020	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	383000	USD
CY2019	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	381000	USD
CY2018	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	311000	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
CY2018	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	7205000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	27660000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	45718000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	19686000	USD
CY2020Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2492734000	USD
CY2019Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2523475000	USD
CY2020Q4	us-gaap	Notes Payable NotesPayable	111000000	USD
CY2019Q4	us-gaap	Notes Payable NotesPayable	162003000	USD
CY2020	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	69077000	USD
CY2019	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	99594000	USD
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
CY2019Q4	us-gaap	Revenues Revenues	98947000	USD
CY2019Q3	us-gaap	Revenues Revenues	98362000	USD
CY2019Q2	us-gaap	Revenues Revenues	84113000	USD
CY2019Q1	us-gaap	Revenues Revenues	85319000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	29993000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	30384000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	24487000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	28821000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	16485000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	16519000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	11941000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	15243000	USD
CY2019Q4	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	104000	USD
CY2019Q3	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	92000	USD
CY2019Q2	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	92000	USD
CY2019Q1	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	93000	USD
CY2019Q4	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	3536000	USD
CY2019Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	3565000	USD
CY2019Q2	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	2933000	USD
CY2019Q1	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	4055000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	12845000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	12862000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	8916000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	11095000	USD
CY2019Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.22
CY2019Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.22
CY2019Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.18
CY2019Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.24
CY2020Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	111000000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	593583000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	1784945000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Carrying Costs RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts	868346000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	628556000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	2618318000	USD
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	754140000	USD
CY2020Q4	srt	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	2300000000	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
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2614138000	USD
CY2020	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	USD
CY2019	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	476421000	USD
CY2018	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	USD
CY2020	us-gaap	Real Estate Improvements RealEstateImprovements	64997000	USD
CY2019	us-gaap	Real Estate Improvements RealEstateImprovements	101285000	USD
CY2018	us-gaap	Real Estate Improvements RealEstateImprovements	62790000	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
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
CY2018	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	0	USD
CY2020	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	6820000	USD
CY2019	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	10355000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2630191000	USD
CY2018	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	46737000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	665222000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	590338000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	537431000	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
CY2018	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	99644000	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
CY2018	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	0	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
CY2018	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	46737000	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

Files In Submission

Name	View Source	Status
0001500217-21-000008-index-headers.html	Edgar Link	pending
0001500217-21-000008-index.html	Edgar Link	pending
0001500217-21-000008.txt	Edgar Link	pending
0001500217-21-000008-xbrl.zip	Edgar Link	pending
aat-20201231.htm	Edgar Link	pending
aat-20201231.xsd	Edgar Link	pending
aat-20201231_cal.xml	Edgar Link	unprocessable
aat-20201231_def.xml	Edgar Link	unprocessable
aat-20201231_g1.jpg	Edgar Link	pending
aat-20201231_g2.gif	Edgar Link	pending
aat-20201231_htm.xml	Edgar Link	completed
aat-20201231_lab.xml	Edgar Link	unprocessable
aat-20201231_pre.xml	Edgar Link	unprocessable
aat-ex211xq42020ng.htm	Edgar Link	pending
aat-ex221xq42020ng.htm	Edgar Link	pending
aat-ex231eyconsentq42020ng.htm	Edgar Link	pending
aat-ex311xq42020ng.htm	Edgar Link	pending
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aat-ex321xq42020ng.htm	Edgar Link	pending
aat-ex322xq42020ng.htm	Edgar Link	pending
aat2020execformofrestricte.htm	Edgar Link	pending
aatdescriptonofsecuritiesn.htm	Edgar Link	pending
aatlp-ex232eyconsentq42020.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$AAT
American Assets Trust, Inc. Stock $aat

2020 Form 10-K Financial Statement

#000150021721000008 Filed on February 16, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AAT American Assets Trust, Inc. Stock $aat

2020 Form 10-K Financial Statement

#000150021721000008 Filed on February 16, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AAT
American Assets Trust, Inc. Stock $aat