$AAT
American Assets Trust, Inc. Stock $aat

$aat Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000150021721000136 Filed on October 29, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2020 Q3
Revenue	$101.7M	$98.29M	$84.37M
YoY Change	25.08%	16.49%	-14.22%
Cost Of Revenue	$36.25M	$33.11M	$30.70M
YoY Change	17.42%	7.85%	-12.11%
Gross Profit	$65.50M	$65.18M	$53.68M
YoY Change	29.75%	21.43%	-15.38%
Gross Profit Margin	64.37%	66.31%	63.62%
Selling, General & Admin	$9.305M	$7.297M	$6.936M
YoY Change	40.14%	5.2%	-2.45%
% of Gross Profit	14.21%	11.2%	12.92%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$30.48M	$30.68M	$26.90M
YoY Change	11.24%	14.05%	1.51%
% of Gross Profit	46.53%	47.07%	50.12%
Operating Expenses	$39.78M	$7.297M	$64.05M
YoY Change	16.81%	-88.61%	-5.78%
Operating Profit	$25.72M	$27.67M	$20.32M
YoY Change	56.66%	36.15%	-33.11%
Interest Expense	-$14.95M	$14.72M	$13.30M
YoY Change	12.29%	10.68%	-3.15%
% of Operating Profit	-58.12%	53.21%	65.45%
Other Income/Expense, Net	-$291.0K	-$52.00K	-$531.0K
YoY Change	-142.17%	-90.21%	305.34%
Pretax Income	$10.48M	$12.90M	$6.490M
YoY Change	176.46%	98.69%	-60.71%
Income Tax		$150.0K	$12.00K
% Of Pretax Income		1.16%	0.18%
Net Earnings	$8.137M	$10.04M	$5.038M
YoY Change	180.78%	99.31%	-60.83%
Net Earnings / Revenue	8.0%	10.22%	5.97%
Basic Earnings Per Share	$0.14	$0.17	$0.08
Diluted Earnings Per Share	$108.7K	$0.17	$0.08
COMMON SHARES
Basic Shares Outstanding	60.47M shares	59.99M shares	59.83M shares
Diluted Shares Outstanding		76.17M shares	76.12M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$139.5M	$171.9M	$155.3M
YoY Change	1.62%	10.7%	34.34%
Cash & Equivalents	$139.5M	$171.9M	$155.3M
Short-Term Investments
Other Short-Term Assets	$9.136M	$8.795M	$6.800M
YoY Change	5.01%	29.34%	1.49%
Inventory
Prepaid Expenses
Receivables	$7.445M	$7.421M	$12.00M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$156.1M	$188.1M	$174.1M
YoY Change	2.1%	8.06%	31.99%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.708B	$2.708B	$2.529B
YoY Change	7.38%	7.08%	0.35%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$0.00	$2.259M	$1.200M
YoY Change	-100.0%	88.25%	-88.57%
Total Long-Term Assets	$2.862B	$2.863B	$2.670B
YoY Change	7.41%	7.23%	0.49%
TOTAL ASSETS
Total Short-Term Assets	$156.1M	$188.1M	$174.1M
Total Long-Term Assets	$2.862B	$2.863B	$2.670B
Total Assets	$3.018B	$3.051B	$2.844B
YoY Change	7.12%	7.28%	1.98%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$64.53M	$88.85M	$71.80M
YoY Change	8.82%	23.75%	13.61%
Accrued Expenses	$27.92M	$28.46M	$30.60M
YoY Change	-7.25%	-7.01%	393.55%
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	$108.9M
YoY Change	4.48%	15.06%	40.88%
LONG-TERM LIABILITIES
Long-Term Debt	$1.649B	$1.649B	$1.407B
YoY Change	17.23%	17.22%	3.59%
Other Long-Term Liabilities	$57.33M	$57.78M	$62.10M
YoY Change	-5.55%	-6.96%	11.49%
Total Long-Term Liabilities	$1.707B	$1.707B	$1.469B
YoY Change	16.29%	16.2%	3.91%
TOTAL LIABILITIES
Total Short-Term Liabilities	$100.3M	$125.3M	$108.9M
Total Long-Term Liabilities	$1.707B	$1.707B	$1.469B
Total Liabilities	$1.808B	$1.832B	$1.578B
YoY Change	15.6%	16.11%	5.86%
SHAREHOLDERS EQUITY
Retained Earnings	-$217.8M	-$207.9M	-$164.5M
YoY Change	23.35%	26.42%	18.06%
Common Stock	$1.454B	$1.451B	$1.444B
YoY Change	0.53%	0.44%	-0.49%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.239B	$1.245B	$1.281B
YoY Change
Total Liabilities & Shareholders Equity	$3.018B	$3.051B	$2.844B
YoY Change	7.12%	7.28%	1.98%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2020 Q3
OPERATING ACTIVITIES
Net Income	$8.137M	$10.04M	$5.038M
YoY Change	180.78%	99.31%	-60.83%
Depreciation, Depletion And Amortization	$30.48M	$30.68M	$26.90M
YoY Change	11.24%	14.05%	1.51%
Cash From Operating Activities	$38.70M	$52.91M	$40.00M
YoY Change	116.18%	32.27%	-22.93%
INVESTING ACTIVITIES
Capital Expenditures	-$47.82M	-$225.8M	-$13.50M
YoY Change	223.08%	1572.27%	-23.73%
Acquisitions
YoY Change
Other Investing Activities	-$1.117M	-$497.0K	-$1.000M
YoY Change	59.57%	-50.3%	-84.13%
Cash From Investing Activities	-$48.93M	-$226.3M	-$14.50M
YoY Change	215.7%	1460.37%	-39.33%
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	-19.10M
YoY Change	20.6%	20.39%	-143.81%
NET CHANGE
Cash From Operating Activities	38.70M	52.91M	40.00M
Cash From Investing Activities	-48.93M	-226.3M	-14.50M
Cash From Financing Activities	-23.88M	-23.00M	-19.10M
Net Change In Cash	-34.11M	-196.3M	6.400M
YoY Change	96.06%	-3167.86%	-91.06%
FREE CASH FLOW
Cash From Operating Activities	$38.70M	$52.91M	$40.00M
Capital Expenditures	-$47.82M	-$225.8M	-$13.50M
Free Cash Flow	$86.51M	$278.7M	$53.50M
YoY Change	164.57%	420.87%	-23.13%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Central Index Key EntityCentralIndexKey	0001500217
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	aat	Maximum Percentage Of Revenue Provided By Any Single Tenant MaximumPercentageOfRevenueProvidedByAnySingleTenant	0.10
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity Registrant Name EntityRegistrantName	AMERICAN ASSETS TRUST, INC.
	dei	Entity File Number EntityFileNumber	001-35030
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-3338708
	dei	Entity Address Address Line1 EntityAddressAddressLine1	3420 Carmel Mountain Road
	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 100
	dei	Entity Address City Or Town EntityAddressCityOrTown	San Diego
	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	92121
	dei	City Area Code CityAreaCode	858
	dei	Local Phone Number LocalPhoneNumber	350-2600
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
	dei	Trading Symbol TradingSymbol	AAT
	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	60472065	shares
CY2021Q3	us-gaap	Rental Properties RentalProperties	3386539000	USD
CY2020Q4	us-gaap	Rental Properties RentalProperties	3155280000	USD
CY2021Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	117069000	USD
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	91047000	USD
CY2021Q3	us-gaap	Land Available For Development LandAvailableForDevelopment	547000	USD
CY2020Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	547000	USD
CY2021Q3	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	3504155000	USD
CY2020Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	3246874000	USD
CY2021Q3	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	823198000	USD
CY2020Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	754140000	USD
CY2021Q3	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2680957000	USD
CY2020Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2492734000	USD
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	171923000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	137333000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	137333000	USD
CY2021Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1716000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1716000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1716000	USD
CY2021Q3	us-gaap	Accounts Receivable Net AccountsReceivableNet	7421000	USD
CY2020Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	6938000	USD
CY2021Q3	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	80369000	USD
CY2020Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	72476000	USD
CY2021Q3	us-gaap	Other Assets OtherAssets	108684000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	106112000	USD
CY2021Q3	us-gaap	Assets Assets	3051070000	USD
CY2020Q4	us-gaap	Assets Assets	2817309000	USD
CY2021Q3	us-gaap	Secured Debt SecuredDebt	110955000	USD
CY2020Q4	us-gaap	Secured Debt SecuredDebt	110923000	USD
CY2021Q3	us-gaap	Unsecured Debt UnsecuredDebt	1537772000	USD
CY2020Q4	us-gaap	Unsecured Debt UnsecuredDebt	1196677000	USD
CY2021Q3	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	99151000	USD
CY2021Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	88851000	USD
CY2020Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	59262000	USD
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CY2020Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	6590000	USD
CY2021Q3	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	86805000	USD
CY2020Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	91300000	USD
CY2021Q3	us-gaap	Liabilities Liabilities	1832379000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1563903000	USD
CY2021Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	490000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	490000000	shares
CY2021Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	60472065	shares
CY2021Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	60472065	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	60476292	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	60476292	shares
CY2021Q3	us-gaap	Common Stock Value CommonStockValue	605000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	605000	USD
CY2021Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1450096000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1445644000	USD
CY2021Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-207910000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-176560000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2248000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	1753000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	1245039000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1271442000	USD
CY2021Q3	us-gaap	Minority Interest MinorityInterest	-26348000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	-18036000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1218691000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1253406000	USD
CY2021Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3051070000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2817309000	USD
CY2021Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	93804000	USD
CY2020Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	80759000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	262573000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	252059000	USD
CY2021Q3	us-gaap	Other Operating Income OtherOperatingIncome	4482000	USD
CY2020Q3	us-gaap	Other Operating Income OtherOperatingIncome	3615000	USD
	us-gaap	Other Operating Income OtherOperatingIncome	11508000	USD
	us-gaap	Other Operating Income OtherOperatingIncome	11167000	USD
CY2021Q3	us-gaap	Revenues Revenues	98286000	USD
CY2020Q3	us-gaap	Revenues Revenues	84374000	USD
	us-gaap	Revenues Revenues	274081000	USD
	us-gaap	Revenues Revenues	263226000	USD
CY2021Q3	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	23466000	USD
CY2020Q3	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	19208000	USD
	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	61916000	USD
	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	58757000	USD
CY2021Q3	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	9644000	USD
CY2020Q3	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	11491000	USD
	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	31610000	USD
	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	31497000	USD
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CY2020Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	6438000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	20574000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	19937000	USD
CY2021Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	30680000	USD
CY2020Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	26914000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	85827000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	80869000	USD
CY2021Q3	us-gaap	Costs And Expenses CostsAndExpenses	70617000	USD
CY2020Q3	us-gaap	Costs And Expenses CostsAndExpenses	64051000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	199927000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	191060000	USD
CY2021Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	27669000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	20323000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	74154000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	72166000	USD
CY2021Q3	us-gaap	Interest Expense InterestExpense	14722000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	13302000	USD
	us-gaap	Interest Expense InterestExpense	43589000	USD
	us-gaap	Interest Expense InterestExpense	40105000	USD
CY2021Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
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CY2021Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-52000	USD
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CY2021Q3	us-gaap	Profit Loss ProfitLoss	12895000	USD
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	us-gaap	Profit Loss ProfitLoss	26115000	USD
	us-gaap	Profit Loss ProfitLoss	31800000	USD
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	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59986844	shares
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	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	417000	USD
	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	260000	USD
CY2021Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	2709000	USD
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CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	10041000	USD
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	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	20239000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	24762000	USD
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59990343	shares
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	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59757709	shares
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
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CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	76171880	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	76118032	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	76168381	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	76115456	shares
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.30
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.25
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.86
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.75
CY2021Q3	us-gaap	Profit Loss ProfitLoss	12895000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	6490000	USD
	us-gaap	Profit Loss ProfitLoss	26115000	USD
	us-gaap	Profit Loss ProfitLoss	31800000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	435000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	1201000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	1657000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-4900000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	13056000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	7359000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	26755000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	25903000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2744000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1555000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	5604000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	5530000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	10312000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5804000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21151000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	20373000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1253406000	USD
CY2021Q1	us-gaap	Profit Loss ProfitLoss	1733000	USD
CY2021Q1	us-gaap	Dividends Dividends	21463000	USD
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1484000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	747000	USD
CY2021Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1235439000	USD
CY2021Q2	us-gaap	Profit Loss ProfitLoss	11487000	USD
CY2021Q2	us-gaap	Dividends Dividends	21464000	USD
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1484000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	475000	USD
CY2021Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1227146000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	12895000	USD
CY2021Q3	us-gaap	Dividends Dividends	22995000	USD
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1484000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	435000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1218691000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1293672000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	15484000	USD
CY2020Q1	us-gaap	Dividends Dividends	22937000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1250000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-6115000	USD
CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1281021000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	9826000	USD
CY2020Q2	us-gaap	Dividends Dividends	15293000	USD
CY2020Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1252000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	14000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1276488000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	6490000	USD
CY2020Q3	us-gaap	Dividends Dividends	19116000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1251000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	1201000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1265982000	USD
	us-gaap	Profit Loss ProfitLoss	26115000	USD
	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Loss DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLoss	0	USD
	us-gaap	Profit Loss ProfitLoss	31800000	USD
	aat	Deferred Rent Revenue And Amortization Of Lease Intangibles DeferredRentRevenueAndAmortizationOfLeaseIntangibles	-13536000	USD
	aat	Deferred Rent Revenue And Amortization Of Lease Intangibles DeferredRentRevenueAndAmortizationOfLeaseIntangibles	-20025000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	85827000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	80869000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1734000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1109000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4271000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Provision For Lease Losses ProvisionForLeaseLosses	-934000	USD
	us-gaap	Provision For Lease Losses ProvisionForLeaseLosses	10803000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4452000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3753000	USD
	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Loss DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLoss	551000	USD
	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	824000	USD
	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	997000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	927000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	3208000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-941000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	7502000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-225000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-1453000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	20589000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	13787000	USD
	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	584000	USD
	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	-1787000	USD
	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	1115000	USD
	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	-1457000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	129632000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	109149000	USD
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	47723000	USD
	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	204511000	USD
	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	0	USD
	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	56772000	USD
	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	48690000	USD
	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	2025000	USD
	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	4884000	USD
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	47760000	USD
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-263345000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-53574000	USD
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	0	USD
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	51003000	USD
	us-gaap	Proceeds From Unsecured Lines Of Credit ProceedsFromUnsecuredLinesOfCredit	0	USD
	us-gaap	Proceeds From Unsecured Lines Of Credit ProceedsFromUnsecuredLinesOfCredit	100000000	USD
	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	100000000	USD
	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	494675000	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	155375000	USD
	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5075000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-119000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	65922000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	57346000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	168303000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-8468000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	34590000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	47107000	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
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	173639000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	156558000	USD
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	171923000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	155327000	USD
CY2021Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1716000	USD
CY2020Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1231000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	173639000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	156558000	USD
CY2021Q3	dei	Entity Number Of Employees EntityNumberOfEmployees	203	Employee
CY2021Q3	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	30	Property
CY2021Q3	aat	Real Estate Properties Held For Development RealEstatePropertiesHeldForDevelopment	3	Property
	us-gaap	Interest Costs Incurred InterestCostsIncurred	45618000	USD
	us-gaap	Interest Costs Incurred InterestCostsIncurred	40892000	USD
	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	2029000	USD
	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	787000	USD
	us-gaap	Interest Expense InterestExpense	43589000	USD
	us-gaap	Interest Expense InterestExpense	40105000	USD
	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, net of valuation adjustments, based on management's assessment of credit, collection and other business risks.</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%">We make estimates of the collectability of our current accounts receivable and straight-line rents receivable which require significant judgment by management. The collectability of receivables is affected by numerous different factors including current economic conditions, including the impact of 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 credit held with respect to tenants, and the ability of the tenant to perform under the terms of their lease agreement. The provision for doubtful accounts at September 30, 2021 and December 31, 2020 was approximately $6.2 million and $10.0 million, respectively.</span></div><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%">Rent Concessions – COVID-19</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%">During the third quarter of 2021, 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"). For the third quarter of 2021, we collected approximately $0.8 million or 96% of the deferred rent repayments due during the period.</span></div>
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	6200000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	10000000	USD
CY2021Q3	aat	Deferred Rent Repayments Covid19 DeferredRentRepaymentsCOVID19	800000	USD
CY2021Q3	aat	Deferred Rent Repayments Covid19 Percentage DeferredRentRepaymentsCOVID19Percentage	0.96
	us-gaap	Interest Paid Net InterestPaidNet	42311000	USD
	us-gaap	Interest Paid Net InterestPaidNet	41547000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	289000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	684000	USD
	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	10119000	USD
	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	14421000	USD
	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	1072000	USD
	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	989000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	Segment
CY2021Q3	aat	Number Of Rooms In Mixed Use Segment All Suite Hotel NumberOfRoomsInMixedUseSegmentAllSuiteHotel	369	Room
CY2021Q3	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	58655000	USD
CY2020Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	56677000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Asset Off Market Lease Favorable Gross FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross	121000	USD
CY2021Q3	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	35357000	USD
CY2020Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	35219000	USD
CY2021Q3	us-gaap	Below Market Lease Net BelowMarketLeaseNet	23298000	USD
CY2020Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	21458000	USD
CY2021Q3	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	8795000	USD
	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	1100000	USD
CY2021Q3	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	38887000	USD
CY2020Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	35167000	USD
CY2021Q3	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	37709000	USD
CY2020Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	38173000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Asset Off Market Lease Favorable Gross FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross	159000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	31504000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	26207000	USD
CY2021Q3	aat	Lease Incentive Accumulated Amortization LeaseIncentiveAccumulatedAmortization	914000	USD
CY2020Q4	aat	Lease Incentive Accumulated Amortization LeaseIncentiveAccumulatedAmortization	802000	USD
CY2021Q3	us-gaap	Incentive To Lessee IncentiveToLessee	611000	USD
CY2020Q4	us-gaap	Incentive To Lessee IncentiveToLessee	994000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1288000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1213000	USD
CY2021Q3	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	2539000	USD
CY2020Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	2565000	USD
CY2021Q3	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	1527000	USD
CY2020Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	0	USD
CY2021Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	543000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	0	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26824000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	29350000	USD
CY2020Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	8702000	USD
CY2021Q3	us-gaap	Other Assets OtherAssets	108684000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	106112000	USD
CY2021Q3	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	23298000	USD
CY2020Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	21458000	USD
CY2021Q3	us-gaap	Deferred Revenue DeferredRevenue	14075000	USD
CY2020Q4	us-gaap	Deferred Revenue DeferredRevenue	14518000	USD
CY2021Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	2874000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	4531000	USD
CY2021Q3	aat	Deferred Rent Expense And Lease Intangible DeferredRentExpenseAndLeaseIntangible	6000	USD
CY2020Q4	aat	Deferred Rent Expense And Lease Intangible DeferredRentExpenseAndLeaseIntangible	16000	USD
CY2021Q3	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	2350000	USD
CY2020Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	2059000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	573000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	570000	USD
CY2021Q3	aat	Deferred Rent Credits DeferredRentCredits	15142000	USD
CY2020Q4	aat	Deferred Rent Credits DeferredRentCredits	18049000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	28455000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	30060000	USD
CY2021Q3	us-gaap	Other Liabilities OtherLiabilities	32000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	39000	USD
CY2021Q3	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	86805000	USD
CY2020Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	91300000	USD
	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-5459000	USD
CY2021Q1	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	First Quarter 2021
CY2021Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.28
CY2021Q1	us-gaap	Dividend Payable Date To Be Paid Day Month And Year DividendPayableDateToBePaidDayMonthAndYear	2021-03-25
CY2021Q2	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Second Quarter 2021
CY2021Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.28
CY2021Q2	us-gaap	Dividend Payable Date To Be Paid Day Month And Year DividendPayableDateToBePaidDayMonthAndYear	2021-06-24
CY2021Q3	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Third Quarter 2021
CY2021Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.30
CY2021Q3	us-gaap	Dividend Payable Date To Be Paid Day Month And Year DividendPayableDateToBePaidDayMonthAndYear	2021-09-23
CY2020Q3	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-1365000	USD
CY2021Q3	us-gaap	Restricted Stock Expense RestrictedStockExpense	1500000	USD
CY2020Q3	us-gaap	Restricted Stock Expense RestrictedStockExpense	1300000	USD
	us-gaap	Restricted Stock Expense RestrictedStockExpense	4500000	USD
	us-gaap	Restricted Stock Expense RestrictedStockExpense	3800000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	4200000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	12895000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	6490000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	26115000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	31800000	USD
CY2021Q3	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	145000	USD
CY2020Q3	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	87000	USD
	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	417000	USD
	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	260000	USD
CY2021Q3	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-2709000	USD
	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-6778000	USD
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	10041000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5038000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	20239000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	24762000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	10041000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	5038000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	20239000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	24762000	USD
CY2021Q3	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships Diluted MinorityInterestInContinuingOperationsIncomeLossOperatingPartnershipsDiluted	-2709000	USD
CY2020Q3	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships Diluted MinorityInterestInContinuingOperationsIncomeLossOperatingPartnershipsDiluted	-1365000	USD
	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships Diluted MinorityInterestInContinuingOperationsIncomeLossOperatingPartnershipsDiluted	-5459000	USD
	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships Diluted MinorityInterestInContinuingOperationsIncomeLossOperatingPartnershipsDiluted	-6778000	USD
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	12750000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	6403000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	25698000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	31540000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59990343	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59825174	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59986844	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59757709	shares
CY2021Q3	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	16181537	shares
CY2020Q3	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	16292858	shares
	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	16181537	shares
	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	16357747	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	76171880	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	76118032	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	76168381	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	76115456	shares
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
	aat	Years Minimum Term Range Of Office And Retail Leases YearsMinimumTermRangeOfOfficeAndRetailLeases	P3Y
	aat	Years Maximum Term Range Of Office And Retail Leases YearsMaximumTermRangeOfOfficeAndRetailLeases	P10Y
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2021Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	600000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	600000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	200000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	500000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	100000	USD
	us-gaap	Loss On Contract Termination For Default LossOnContractTerminationForDefault	4300000	USD
	aat	Number Of Consolidated Properties NumberOfConsolidatedProperties	15	Property
	aat	Maximum Percentage Of Revenue Provided By Any Single Tenant MaximumPercentageOfRevenueProvidedByAnySingleTenant	0.10
	aat	Months Minimum Term Of Apartment Leases MonthsMinimumTermOfApartmentLeases	P7M
	aat	Months Maximum Term Length Of Apartment Leases MonthsMaximumTermLengthOfApartmentLeases	P15M
	aat	Operating Leases Rental Period Terms OperatingLeasesRentalPeriodTerms	P12M
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	55108000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	231285000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	215130000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	183250000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	161934000	USD
CY2021Q3	aat	Lessor Operating Lease Payment To Be Received After Year Four LessorOperatingLeasePaymentToBeReceivedAfterYearFour	489326000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	1336033000	USD
	aat	Operating Leases Rental Period Terms OperatingLeasesRentalPeriodTerms	P12M
	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
CY2021Q3	us-gaap	Sublease Income SubleaseIncome	745000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	796000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	3232000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3328000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3428000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3531000	USD
CY2021Q3	aat	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	19710000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	34025000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	5570000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	28455000	USD
CY2021Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	831000	USD
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	999000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	3095000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	2788000	USD
CY2021Q3	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
CY2020Q3	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
CY2020Q3	us-gaap	Sublease Income SubleaseIncome	1182000	USD
	us-gaap	Sublease Income SubleaseIncome	2877000	USD
	us-gaap	Sublease Income SubleaseIncome	3123000	USD
CY2021Q3	us-gaap	Lease Cost LeaseCost	86000	USD
CY2020Q3	us-gaap	Lease Income LeaseIncome	183000	USD
	us-gaap	Lease Cost LeaseCost	218000	USD
	us-gaap	Lease Income LeaseIncome	335000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y9M18D
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0319
	us-gaap	Operating Lease Payments OperatingLeasePayments	1996000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	2557000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	27321000	USD
CY2021Q3	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	969000	USD
CY2020Q3	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	1353000	USD
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	2593000	USD
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	1677000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8164000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4680000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	17626000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	13948000	USD
CY2021Q3	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	591000	USD
CY2020Q3	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	527000	USD
	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	1724000	USD
	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	1628000	USD
CY2021Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	93804000	USD
CY2020Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	80759000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	262573000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	252059000	USD
CY2021Q3	us-gaap	Straight Line Rent StraightLineRent	3800000	USD
CY2020Q3	us-gaap	Straight Line Rent StraightLineRent	4200000	USD
	us-gaap	Straight Line Rent StraightLineRent	10800000	USD
	us-gaap	Straight Line Rent StraightLineRent	14000000	USD
CY2021Q3	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	800000	USD
CY2020Q3	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	900000	USD
	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	2400000	USD
	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	2800000	USD
CY2021Q3	aat	Direct Costs Of Leased Property Lessor Expense DirectCostsOfLeasedPropertyLessorExpense	11014000	USD
CY2020Q3	aat	Direct Costs Of Leased Property Lessor Expense DirectCostsOfLeasedPropertyLessorExpense	9501000	USD
	aat	Direct Costs Of Leased Property Lessor Expense DirectCostsOfLeasedPropertyLessorExpense	30165000	USD
	aat	Direct Costs Of Leased Property Lessor Expense DirectCostsOfLeasedPropertyLessorExpense	28078000	USD
CY2021Q3	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	5429000	USD
CY2020Q3	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	3153000	USD
	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	12287000	USD
	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	10893000	USD
CY2021Q3	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	4492000	USD
CY2020Q3	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	4199000	USD
	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	12263000	USD
	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	12816000	USD
CY2021Q3	us-gaap	Marketing Expense MarketingExpense	470000	USD
CY2020Q3	us-gaap	Marketing Expense MarketingExpense	498000	USD
	us-gaap	Marketing Expense MarketingExpense	1174000	USD
	us-gaap	Marketing Expense MarketingExpense	1384000	USD
CY2021Q3	us-gaap	Operating Lease Expense OperatingLeaseExpense	856000	USD
CY2020Q3	us-gaap	Operating Lease Expense OperatingLeaseExpense	1029000	USD
	us-gaap	Operating Lease Expense OperatingLeaseExpense	3166000	USD
	us-gaap	Operating Lease Expense OperatingLeaseExpense	2834000	USD
CY2021Q3	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	794000	USD
CY2020Q3	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	556000	USD
	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	1960000	USD
	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	1928000	USD
CY2021Q3	us-gaap	Management Fee Expense ManagementFeeExpense	411000	USD
CY2020Q3	us-gaap	Management Fee Expense ManagementFeeExpense	272000	USD
	us-gaap	Management Fee Expense ManagementFeeExpense	901000	USD
	us-gaap	Management Fee Expense ManagementFeeExpense	824000	USD
CY2021Q3	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	23466000	USD
CY2020Q3	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	19208000	USD
	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	61916000	USD
	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	58757000	USD
CY2021Q3	us-gaap	Interest And Other Income InterestAndOtherIncome	98000	USD
CY2020Q3	us-gaap	Interest And Other Income InterestAndOtherIncome	32000	USD
	us-gaap	Interest And Other Income InterestAndOtherIncome	272000	USD
	us-gaap	Interest And Other Income InterestAndOtherIncome	415000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	150000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	451000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	127000	USD
CY2021Q3	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	0	USD
CY2020Q3	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	551000	USD
	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	0	USD
	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	549000	USD
CY2021Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-52000	USD
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-531000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-179000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-261000	USD
	aat	Percentage Of Investment In Related Party PercentageOfInvestmentInRelatedParty	0.477
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	Segment
CY2021Q3	aat	Number Of Rooms In Mixed Use Segment All Suite Hotel NumberOfRoomsInMixedUseSegmentAllSuiteHotel	369	Room
CY2021Q3	us-gaap	Gross Profit GrossProfit	65176000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	53675000	USD
	us-gaap	Gross Profit GrossProfit	180555000	USD
	us-gaap	Gross Profit GrossProfit	172972000	USD
CY2021Q3	us-gaap	Gross Profit GrossProfit	65176000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	53675000	USD
	us-gaap	Gross Profit GrossProfit	180555000	USD
	us-gaap	Gross Profit GrossProfit	172972000	USD
CY2021Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	6827000	USD
CY2020Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	6438000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	20574000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	19937000	USD
CY2021Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	30680000	USD
CY2020Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	26914000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	85827000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	80869000	USD
CY2021Q3	us-gaap	Interest Expense InterestExpense	14722000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	13302000	USD
	us-gaap	Interest Expense InterestExpense	43589000	USD
	us-gaap	Interest Expense InterestExpense	40105000	USD
CY2021Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4271000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2021Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-52000	USD
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-531000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-179000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-261000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	12895000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	6490000	USD
	us-gaap	Profit Loss ProfitLoss	26115000	USD
	us-gaap	Profit Loss ProfitLoss	31800000	USD
CY2021Q3	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	145000	USD
CY2020Q3	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	87000	USD
	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	417000	USD
	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	260000	USD
CY2021Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	2709000	USD
CY2020Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	1365000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	5459000	USD
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	6778000	USD
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	10041000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5038000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	20239000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	24762000	USD
CY2021Q3	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2680957000	USD
CY2020Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2492734000	USD
CY2021Q3	us-gaap	Notes Payable NotesPayable	111000000	USD
CY2020Q4	us-gaap	Notes Payable NotesPayable	111000000	USD
CY2021Q3	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	21743000	USD
CY2020Q3	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	14441000	USD
	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	58797000	USD
	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	53574000	USD

Files In Submission

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American Assets Trust, Inc. Stock $aat

2021 Q4 Form 10-Q Financial Statement

#000150021721000136 Filed on October 29, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AAT American Assets Trust, Inc. Stock $aat

2021 Q4 Form 10-Q Financial Statement

#000150021721000136 Filed on October 29, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AAT
American Assets Trust, Inc. Stock $aat