Property operating, excluding real estate taxes Cost of Other Property Operating Expense Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Award Timing Predetermined Award Timing Predetermined [Flag] Via Via [Member] Via Entity File Number Entity File Number Additional paid-in capital Additional Paid-in Capital [Member] Aviara Aviara [Member] Aviara [Member] Reversal of unrealized gains upon the sale of marketable debt securities Reversal of unrealized gains upon the sale of marketable debt securities Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Tabular List, Table Tabular List [Table Text Block] Marketable securities, unrealized gain (loss) Marketable Securities, Accumulated Gross Unrealized Gain (Loss), Before Tax Marketable Securities, Accumulated Gross Unrealized Gain (Loss), Before Tax Huntington Breakers Huntington Breakers [Member] Huntington Breakers Recently Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Chestnut Street Chestnut Street [Member] Chestnut Street Investment funds - debt securities Debt Securities [Member] Vox Vox [Member] Name of property acquired. Wilshire Promenade Wilshire Promenade [Member] Wilshire Promenade Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Sales commissions and fees Sales Commissions and Fees Hillsdale Garden Hillsdale Garden [Member] Hillsdale Garden Revenues Revenue from Contract with Customer [Text Block] Buildings and improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Building and Improvements, Amount Essex Portfolio, L.P. Essex Portfolio, L.P. [Member] Essex Portfolio, L.P. [Member] Preferred equity investment Joint Venture, Preferred Equity Investment Joint Venture, Preferred Equity Investment Preferred Equity Investment Preferred Equity Investment [Member] Preferred Equity Investment Willow Lake Willow Lake [Member] Willow Lake Brighton Ridge Brighton Ridge [Member] Brighton Ridge Stock, Class of Stock [Table] Stock, Class of Stock [Table] Schedule of Cash and Cash Equivalents Reconciliation Schedule of Cash and Cash Equivalents [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Lawrence Station Lawrence Station [Member] Lawrence Station [Member] Percentage of remaining performance obligations due per period Revenue, Remaining Performance Obligation, Percentage Initial cost SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] Principles of Consolidation and Basis of Presentation Consolidation, Policy [Policy Text Block] Capital gain Status of Cash Dividend Capital gain percentage The portion of cash dividends distributed during the period relating to capital gain. Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Stock Options Share-Based Payment Arrangement, Option [Member] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Pinnacle at Fullerton Pinnacle at Fullerton [Member] Pinnacle at Fullerton [Member] Notes and other receivables, net of allowance for credit losses of $0.6 million and $0.5 million as of December 31, 2025 and December 31, 2024, respectively Notes and other receivables, net of allowance for credit losses of $0.6 million and $0.5 million as of December 31, 2025 and December 31, 2024, respectively Total notes and other receivables Notes and other receivables Financing Receivable, after Allowance for Credit Loss Related Party Bridge Loan On Property Acquired By Wesco I Related Party Bridge Loan On Property Acquired By Wesco I [Member] Related Party Bridge Loan On Property Acquired By Wesco I Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Casualty loss Asset Impairment Charges Common stock dividends Dividends, Common Stock, Cash Total stockholders’ equity Equity, Attributable to Parent Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] The Bernard Bernard [Member] A 63-unit community located in the Lower Queen Anne district of Seattle, Washington. Summary of Depreciable Life of Various Categories of Fixed Assets Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Valley Park Valley Park [Member] Valley Park The Huntington The Huntington [Member] The Huntington. Santee Court/Santee Village Santee Court [Member] 165-unit apartment community located in Los Angeles, California. Magnolia Square/Magnolia Lane Magnolia Square [Member] Magnolia Square LIABILITIES AND EQUITY LIABILITIES AND CAPITAL Liabilities and Equity [Abstract] Number of consolidated project Development Pipeline, Number Of Consolidated Projects Development Pipeline, Number Of Consolidated Projects Cover page. Cover [Abstract] Maximum Maximum [Member] Exercisable at year end (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Real estate investments: Real Estate Investment Property, Net [Abstract] Annualized preferred return rate Joint Venture, Preferred Returns Rate Joint Venture, Preferred Returns Rate Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Stock option and restricted stock plans, net (in shares) General partner’s stock based compensation, net (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture Acquired in-place lease value, net Finite-Lived Intangible Assets, Net Total leased assets Lease, Right-Of-Use Asset Lease, Right-Of-Use Asset Restricted Stock Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Real Estate and Accumulated Depreciation, by Property [Table] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table] Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Costs capitalized subsequent to acquisition SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition, Cost Schedule of Restricted Stock Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Debt securities, unrealized gain (loss) Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax Retirement Benefits [Abstract] Total Vested and Outstanding Units Total outstanding incentive units [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Cambridge Park Cambridge Park [Member] Cambridge Park [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] The Village at Toluca Lake The Village at Toluca Lake [Member] The Village at Toluca Lake Entity Shell Company Entity Shell Company Variable Interest Entities Variable Interest Entities [Policy Text Block] Disclosure of accounting policy regarding variable interest entities. The Commons The Commons [Member] 264-unit community located in Campbell, California. Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Pointe at Cupertino Pointe at Cupertino [Member] Pointe at Cupertino, The Accumulated depreciation: SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] The Havens The Havens [Member] The Havens Stock-based compensation capitalized Share-Based Payment Arrangement, Amount Capitalized Operating segments Operating Segments [Member] Comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] 2015 LTIP Units 2015 LTIP Units [Member] 2015 LTIP Units [Member] MB 360 MB 360 Phase 1 [Member] MB 360 Phase 1 [Member] Canvas Canvas [Member] Canvas Redemptions of noncontrolling interest Payments to Noncontrolling Interests Unsecured Bonds 1.700% Unsecured Bonds 1.700%, Due March 2028 [Member] Unsecured Bonds 1.700%, Due March 2028 Allegro Allegro [Member] 97-unit condominium development located in the Los Angeles, California area. Hacienda at Camarillo Oaks Hacienda At Camarillo Oaks [Member] Hacienda At Camarillo Oaks Document Fiscal Period Focus Document Fiscal Period Focus Mariner’s Place Mariners Place [Member] Mariners Place Real estate taxes Real Estate Tax Expense Award Timing Method Award Timing Method [Text Block] Weighted Average Essex Ownership Percentage Limited Partnership Interest In Partnership Investments This element represents a description of the nature of common ownership or management control relationships with other entities, regardless of there being transactions between the entities, when the existence of that control could result in operating results or financial position of the reporting entity significantly different from that which would have been obtained if the entities' were autonomous. Debt securities, amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Award Type [Axis] Award Type [Axis] Investment, Name [Domain] Investment, Name [Domain] Equity-based Compensation Share-Based Payment Arrangement [Policy Text Block] Distributions in excess of accumulated earnings Accumulated Distributions in Excess of Net Income [Member] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Total Return Swap Total Return Swap [Member] Land improvements and certain exterior components of real property Land Improvements and Certain Exterior Components of Real Property [Member] Long lived, depreciable assets that are an addition or improvement to real estate held for productive use and certain exterior components of real property. Emme Emme [Member] Emme Entity Address, City or Town Entity Address, City or Town Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Realized and unrealized gains on marketable securities, net Realized and unrealized gains on marketable securities, net Marketable Security, Gain (Loss) Mission Peaks Mission Peaks [Member] Mission Peaks [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Contract Price at Pro Rata Share Business Combination, Consideration Transferred Remaining terms (in years) Debt Instrument Payment Remaining Terms Represents payment remaining terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment in "PnYnMnD" format. Impairment loss from unconsolidated co-investments Equity Method Investment, Other-than-Temporary Impairment Entity Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three Outstanding at beginning of year (in shares) Outstanding at end of year (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Fixed Rate Public Offering Bond Fixed Rate Public Offering Bond [Member] Debt security, in which the authorized issuer owes the holder a debt and is obliged to repay the principal and interest (the coupon). Cash and cash equivalents-restricted Cash and cash equivalents - restricted Restricted Cash and Cash Equivalent Unsecured Bonds 1.650% Unsecured Bonds 1.650%, Due January 2031 [Member] Unsecured Bonds 1.650%, Due January 2031 Highridge Hillsdale Garden Apartments [Member] Hillsdale Garden Apartments Distributions to noncontrolling interest Payments of Distributions to Affiliates Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Notes receivable Notes Receivable Notes Receivable Fourth & U Fourth U [Member] Fourth and U Schedule of Marketable Securities Marketable Securities [Table Text Block] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Unsecured Bonds 3.500% Unsecured Bonds 3.500% [Member] Unsecured Bonds 3.500% [Member] Buildings and improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Mio Mio [Member] Mio Apartment Community [Member] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date The Palms at Laguna Niguel The Palms at Laguna Niguel [Member] The Palms at Laguna Niguel [Member] Life used for depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation Basis spread on rate Debt Instrument, Basis Spread on Variable Rate Interest and other income Interest And Other Income (Expense) Interest And Other Income (Expense) Epic Epic [Member] Epic Other assets Other Assets Statement of Financial Position Location, Activity, Capitalization [Axis] Statement of Financial Position Location, Activity, Capitalization [Axis] Unsecured debt, net Unsecured debt, net Unsecured Debt Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Investments in Majority-Owned Subsidiaries Investment, Affiliated Issuer, Controlled, Majority-Owned [Member] Change in fair value of derivatives and amortization of swap settlements Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Inglenook Court Inglenook Court [Member] Inglenook Court Unsecured Bonds 2.550% Unsecured Bonds 2.550%, Due June 2031 [Member] Unsecured Bonds 2.550%, Due June 2031 Total Return Swap Callable Total Return Swap, Callable [Member] Total Return Swap, Callable [Member] Guarantor Obligation [Table] Guarantor Obligation [Table] Preferred equity investment, commitment to fund Preferred Equity Investment, Commitment To Fund Preferred Equity Investment, Commitment To Fund Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Net proceeds from stock options exercised Proceeds from Stock Options Exercised Apartments Located In Mountain View Apartments Located In Mountain View [Member] Apartments Located In Mountain View Effect of dilutive securities Income Effect Of Dilutive Securities Includes effect on net income resulting from the assumption that dilutive convertible securities were converted, options, or warrants exercised, or that other shares were issued upon the satisfaction of certain conditions. Building and Improvements Building and Building Improvements [Member] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Gain Contingencies Commitments and Contingencies, Policy [Policy Text Block] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] Mira Monte Mira Monte [Member] Mira Monte Redemptions Redemptions Of Noncontrolling Interest Redemptions of noncontrolling interest during the reporting period. Unvested at beginning of year (in shares) Unvested at end of year (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Renaissance at Uptown Orange Renaissance at Uptown Orange [Member] Renaissance at Uptown Orange [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Wilshire La Brea Wilshire La Brea [Member] Wilshire La Brea [Member] Proceeds from insurance for property losses Proceeds from Insurance Settlement, Investing Activities Common Equity Common Equity Common Equity [Member] Straight line rent receivables Straight Line Rent Receivable [Member] Straight Line Rent Receivable Mission Hills Mission Hills [Member] Mission Hills Debt instrument, term Debt Instrument, Term Debt securities, carrying value Debt Securities, Available-for-Sale, Excluding Accrued Interest Depreciable life, average Property, Plant and Equipment, Useful Life Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Schedule of Weighted Average Assumptions Used to Estimate Fair Value of Stock Options Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Equity Method Investment, Nonconsolidated Investee or Group of Investees Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation and amortization Depreciation and amortization Depreciation Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Real Estate Properties [Line Items] Real Estate Properties [Line Items] Sublease income Sublease Income Changes in the redemption value of redeemable noncontrolling interest Noncontrolling Interest, Change in Redemption Value Monterey Villas Monterey Villas [Member] Monterey Villas Summerhill Park Summerhill Park [Member] Summerhill Park Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Common stock dividends paid Common unit distributions paid Payments of Ordinary Dividends Redemptions of noncontrolling interest (in shares) Redemptions (in shares) Redemptions Of Noncontrolling Interest, Shares Redemptions Of Noncontrolling Interest, Shares Unamortized discount (premium), net Debt Instrument, Unamortized Discount (Premium), Net Entity Address, State or Province Entity Address, State or Province Alpine Village Alpine Village [Member] Alpine Village Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Line of credit facility increase amount Line Of Credit Facility, Increase Option Amount Line Of Credit Facility, Increase Option Amount The Grand The Grand Apartment [Member] The Grand Apartment Issuance of common stock under: Issuance Of Common Stock Under [Abstract] CentrePointe CentrePointe [Member] CentrePointe (The Bluffs II) Individual: Individual [Axis] Company contributions to benefit plan Defined Contribution Plan, Cost Accrued interest from notes and other receivables Increase (Decrease) in Other Receivables Fairhaven Fairhaven [Member] Fairhaven Document Annual Report Document Annual Report Entities [Table] Entities [Table] Fountains at River Oaks Fountain At Riveroaks [Member] Fountain At Riveroaks [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Depreciation and amortization Other Depreciation and Amortization Tax benefit (expense) on unconsolidated co-investments Tax benefit (expense) on unconsolidated co-investments Deferred Other Tax Expense (Benefit) Payments on unsecured debt and mortgage notes Debt associated with the property Repayments of debt Repayments of Long-Term Debt The Trails of Redmond The Trails of Redmond [Member] The Trails of Redmond [Member] Entity Interactive Data Current Entity Interactive Data Current Term extension period Debt Instrument, Terms, Extension Period Debt Instrument, Terms, Extension Period Notes Receivable Notes receivable [Policy Text Block] Disclosure of accounting policy for notes receivable relating to real estate financing including mezzanine and bridge loans exceeding one year secured by real estate. Marketable securities, carrying value Marketable Securities Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] The Hallie The Hallie [Member] The Hallie on Del Mar/Rey/Sol [Member] Skye at Bunker Hill Skye at Bunker Hill [Member] Skye at Bunker Hill Ownership [Domain] Ownership [Domain] Land SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land Wandering Creek Wandering Creek [Member] Wandering Creek Montclaire Montclaire [Member] Montclaire, The Long Term Incentive Plan 2014 Units Long Term Incentive Plan 2014 Units [Member] Equity-based payment arrangement where one or more employees receive shares of stock (units), stock (unit) options, or other equity instruments, or the employer incurs a liability to the employee in amounts based on the price of the employer's stock (unit). Unsecured Bonds 4.000% Unsecured Bonds 4.000%, Due March 2029 [Member] A debt security, in which the authorized issuer owes the holders a debt and is obliged to repay the principal and interest (the coupon) at a later date Schedule of Lessor Future Minimum Base Rent Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Other real estate assets Other Real Estate Assets [Member] Other Real Estate Assets [Member] Commercial paper Commercial Paper 17461 Derian Ave 17461 Derian Ave [Member] 17461 Derian Ave Revere Campbell Patina At Midtown [Member] Patina At Midtown Auditor [Table] Auditor [Table] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Additions to real estate: Payments to Acquire and Develop Real Estate [Abstract] Park Hill at Issaquah Park Hill at Issaquah [Member] Park Hill at Issaquah Schedule of Unsecured Debt Principal Payments Excluding Lines of Credit Schedule of Aggregate Principal Payments of Mortgage Notes Payable Schedule of Maturities of Long-Term Debt [Table Text Block] Total revenues Property revenues Revenues Note receivable, secured, bearing interest at 11.25%, due October 2027 (Originated October 2022) Secured Note Receivable, 11.25% Interest Rate, Due October 2027 [Member] Secured Note Receivable, 11.25% Interest Rate, Due October 2027 Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Preferred Equity Investment Property In Washington and California Preferred Equity Investment Property In Washington And California [Member] Preferred Equity Investment Property In Washington And California Aggregate cost for federal income tax purpose Aggregate Cost For Federal Income Tax Purpose Refers to aggregate cost for federal income tax purpose. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Land and Land Improvements Land and Land Improvements [Member] Schedule of Reconciliation of Revenues and Operating Profit (Loss) from Segments to Consolidated Reconciliation Of Revenues And Operating Profit Loss From Segments To Consolidated [Table Text Block] Tabular disclosure of all significant reconciling items in the reconciliation of revenues and total profit or loss from reportable segments, to the entity's consolidated income before income taxes, extraordinary items, and discontinued operations. Communities within DownREIT partnerships (in communities) Number Of Communities Within Downreit Partnerships The number of communities within the DownREIT partnerships. Prepaid expenses, receivables, operating lease right-of-use assets, and other assets Increase (Decrease) in Prepaid Expense and Other Assets The Palisades Palisades [Member] Palisades, The Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Note receivables Financing Receivable, before Allowance for Credit Loss Operating Partnership Operating Partnership [Member] Operating Partnership [Member] Construction payable Construction Payable Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] The Lofts at Pinehurst Lofts at Pinehurst [Member] Lofts at Pinehurst, The Entity Address, Address Line One Entity Address, Address Line One Emerald Ridge Emerald Ridge [Member] Emerald Ridge - North Accumulated other comprehensive income (loss), net AOCI Attributable to Parent [Member] Gain on remeasurement of co-investment Gain on remeasurement of co-investment Gain On Remeasurement Of Co-Investment Refers to unrealized gain on revaluation of equity method investment. Total preferred interest co-investments Total preferred interest investments [Member] Equity method investment pertaining to total preferred interest investments Redeemable noncontrolling interest Redeemable noncontrolling interest Beginning balance Ending balance Redeemable Noncontrolling Interest, Equity, Carrying Amount Canyon Pointe Canyon Pointe [Member] Canyon Pointe Ownership [Axis] Ownership [Axis] Number of investments with a commitment to fund Equity Method Investment, Commit To Fund, Number Of Investments Equity Method Investment, Commit To Fund, Number Of Investments Number of apartments owned through joint ventures Number Of Apartments Owned Through Joint Ventures Number Of Apartments Owned Through Joint Ventures Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Ordinary income Status of Cash Dividend Ordinary income percentage The portion of cash dividends distributed during the period relating to ordinary income. Name of Property [Domain] Name of Property [Domain] Fair Value as of Grant Date Award Grant Date Fair Value Equity securities, amortized cost Equity Securities, FV-NI, Cost Highridge Highridge [Member] Highridge Mylo Mylo [Member] Mylo Courtyard off Main Courtyard off Main [Member] 110-unit community located in Bellevue, Washington. Regency at Encino Regency at Encino [Member] 75-unit community located in Encino, California. Schedule of Senior Unsecured Notes Schedule of Mortgages Notes Payable Schedule of Long-Term Debt Instruments [Table Text Block] Effect of dilutive securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Weighted average maturity Debt Instruments Maturity Period The period when the debt instrument is scheduled to be fully repaid. Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Carmel Creek Carmel Creek [Member] Carmel Creek [Member] Total expenses Costs and Expenses Forfeited and canceled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Related Party Transaction [Line Items] Related Party Transaction [Line Items] Walnut Heights Walnut Heights [Member] Walnut Heights Straight line rent concession Straight Line Rent Concession [Member] Straight Line Rent Concession Pacific Western Insurance LLC Pacific Western Insurance LLC [Member] Pacific Western Insurance LLC [Member] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Value of property Value Of Property Held By Equity Method Investment Value Of Property Held By Equity Method Investment Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Contractual life Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Apartment homes Number of Units in Real Estate Property Solstice Solstice [Member] Solstice [Member] Prepaid expenses and other assets Prepaid expenses and other assets Prepaid Expense and Other Assets BEXAEW, BEX II, BEX IV, and 500 Folsom Membership Interest In BEXAEW, BEX II, BEX IV and 500 Folsom [Member] Membership interest in BEXAEW, BEX II, BEX III, BEX IV, and 500 Folsom [Member] Non-PEO NEO Non-PEO NEO [Member] Date acquired Real Estate And Accumulated Depreciation Period Date Acquired Date the property was acquired. City View City View [Member] City View Purchase commitment, funded amount Equity Method Investments, Purchase Commitment, Funded Amount Equity Method Investments, Purchase Commitment, Funded Amount Shadow Point Shadow Point [Member] Shadow Point Windsor Ridge Windsor Ridge [Member] Windsor Ridge Pinnacle Sonata Pinnacle Sonata [Member] Pinnacle Sonata [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Noncontrolling interests in VIE Noncontrolling Interest in Variable Interest Entity Land Land [Member] Notes and other receivable, allowance for credit loss Allowance for credit losses Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss Mill Creek at Windermere Mill Creek at Windermere [Member] Mill Creek at Windermere Award Type [Domain] Award Type [Domain] Payments related to debt prepayment penalties Payment for Debt Extinguishment or Debt Prepayment Cost 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Co-investments Investments In (Distributions In Excess Of Investments In) And Advance To Affiliates, Subsidiaries, Associates, And Joint Ventures Investments In (Distributions In Excess Of Investments In) And Advance To Affiliates, Subsidiaries, Associates, And Joint Ventures Total - Marketable securities Marketable Securities [Member] Marketable Securities Acquisition, development, and improvement of real estate SEC Schedule III, Real Estate, Improvements, Acquisitions, And Developments SEC Schedule III, Real Estate, Improvements, Acquisitions, And Developments Noncontrolling interest Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Total operating and other co-investments, net Total Operating And Other Co-Investments, Net [Member] Equity method investment pertaining to the total operating and other co-investments, net Real Estate Investments Real Estate Disclosure [Text Block] Straight-lined rents Straight Line Rent Other property Other Property Leasing Revenue [Member] Other Property Leasing Revenue [Member] Certificates of deposit Certificates of Deposit [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Deferred revenue, revenue recognized Contract with Customer, Liability, Revenue Recognized Notes Receivable, Secured Notes Receivable, Secured [Member] Notes Receivable, Secured MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Sales and maturities of marketable securities Payments For (Proceeds From) Sales And Maturities Of Marketable Securities Payments For (Proceeds From) Sales And Maturities Of Marketable Securities Brio Brio [Member] Brio [Member] Revenues: Revenues [Abstract] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Encumbrance SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Amount of Encumbrances Accumulated other comprehensive income, net Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax 2026 Long-Term Debt, Maturity, Year One Le Parc Le Parc Luxury Apartments [Member] Le Parc Luxury Apartments Financial Instruments [Domain] Financial Instruments [Domain] Number of unsecured term loans Number Of Unsecured Term Loans Number Of Unsecured Term Loans Avant Avant [Member] Avant Member] 2030 Long-Term Debt, Maturity, Year Five The Barkley Barkley [Member] Barkley, The Brookside Oaks Brookside Oaks [Member] Brookside Oaks ViO ViO [Member] ViO Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Acquisitions Real Estate Property, Acquired [Member] Real Estate Property, Acquired [Member] Aqua Marina Del Rey Aqua at Marina Del Rey [Member] Aqua at Marina Del Rey [Member] Statement of Financial Position Location, Activity, Capitalization [Domain] Statement of Financial Position Location, Activity, Capitalization [Domain] Minimum Minimum [Member] Shadowbrook Shadowbrook [Member] Shadowbrook [Member] Pinnacle at Otay Ranch I & II Pinnacle at Otay Ranch I & II [Member] Pinnacle at Otay Ranch I & II [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Long Term Incentive Plan Z Units and LTIP Units [Member] Long Term Incentive Plans - Z Units and 2014 LTIP Units Long Term Incentive Plan Z Units and LTIP Units [Member] Combined equity-based payment arrangement where one or more employees receive shares of stock (units), stock (unit) options, or other equity instruments, or the employer incurs a liability to the employee in amounts based on the price of the employer's stock (unit). Camarillo Oaks Camarillo Oaks [Member] Camarillo Oaks Fixed rate mortgage notes payable Mortgage Notes Payable [Member] A loan to finance the purchase of real estate where the lender has a lien on the property as collateral for the loan. Unsecured Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Ownership interest in partnership Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Operating cash flows from operating leases Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Dividends payable Dividends Payable Net income available to common stockholders/unitholders Net Income (Loss) Available to Common Stockholders, Diluted Furniture, fixtures and equipment Furniture, Fixtures And Equipment [Member] Furniture, Fixtures And Equipment [Member] Changes in Accumulated Other Comprehensive Income, by Component Changes in Accumulated Other Comprehensive Income Loss Net by Component [Policy Text Block] Disclosure of accounting policy for changes in accumulated other comprehensive income loss net by component. Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Fountain Park Fountain Park [Member] Fountain Park Changes in the redemption value and redemptions of redeemable noncontrolling interest (in shares) Noncontrolling Interest, Change in Redemption Shares Noncontrolling Interest, Change in Redemption Shares Weighted average number of shares outstanding during the year (in shares) Weighted average number of common units outstanding during the year (in shares) Weighted average number of shares outstanding during the year (in shares) Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Entity Small Business Entity Small Business Convertible units Convertible Limited Partnership Units [Member] Convertible limited partnership units, including vested Series Z incentive units, which are not included in determination of diluted earnings per share because they are anti-dilutive. Construction defects at communities Litigation Settlement, Number Of Communities Litigation Settlement, Number Of Communities Document Transition Report Document Transition Report Prepayment penalty, percent of principal prepaid Debt Instrument, Prepayment Penalty, Percent Of Principal Prepaid Debt Instrument, Prepayment Penalty, Percent Of Principal Prepaid Underlying Securities Award Underlying Securities Amount Real Estate Rental Properties Real Estate Rental Properties [Policy Text Block] Disclosure of accounting policy for real estate rental properties. Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Issuance of OP units to noncontrolling interest (in shares) Noncontrolling Interest, Increase from Subsidiary Equity Issuance, Units Noncontrolling Interest, Increase from Subsidiary Equity Issuance, Units Unsecured Bonds 5.375% Unsecured Bonds 5.375% Unsecured Bonds 5.375%, Due April 2035 [Member] Unsecured Bonds 5.375%, Due April 2035 Debt instrument, unamortized premium Debt Instrument, Unamortized Premium San Marcos San Marcos [Member] San Marcos Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] 1250 Lakeside Twelve Fifty Lakeside [Member] Twelve Fifty Lakeside Short-term lease cost Short-Term Lease, Cost Total equity Beginning balance Ending balance Equity Equity, Including Portion Attributable to Noncontrolling Interest Amortization of discount and debt financing costs, net Amortization of Debt Discount (Premium) Document Type Document Type Schedule of Reconciliation of Assets from Segment to Consolidated Reconciliation of Assets from Segment to Consolidated [Table Text Block] Net Income Per Common Share and Net Income Per Common Unit Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Collins on Pine Collins On Pine [Member] Collins On Pine [Member] Product and Service [Axis] Product and Service [Axis] Variable lease cost Variable Lease, Cost Management and other fees from affiliates Revenue from Contract with Customer, Excluding Assessed Tax The Dylan The Dylan [Member] The Dylan [Member] Deer Valley Deer Valley [Member] Deer Valley [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Investments in notes receivable Payments to Acquire Notes Receivable Distributions in excess of investments in co-investments Distributions in excess of investments in co-investments Distributions In Excess Of Investments In And Advance To Affiliates, Subsidiaries, Associates, And Joint Ventures Distributions In Excess Of Investments In And Advance To Affiliates, Subsidiaries, Associates, And Joint Ventures Unsecured Bonds 4.500% Unsecured Bonds 4.5%, Due May 2048 [Member] Unsecured Bonds 4.5%, Due May 2048 [Member] Wallace on Sunset Wallace On Sunset [Member] Wallace On Sunset Forfeited and canceled (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Company’s share of gain on the sales of co-investment Company’s share of gain on the sales of co-investment Equity Method Investment, Realized Gain (Loss) on Disposal Fixed interest rate Derivative, Fixed Interest Rate Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Intrinsic value of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Payments related to tax withholding for share-based compensation Payment, Tax Withholding, Share-Based Payment Arrangement Accelerated share-based compensation cost Share-Based Payment Arrangement, Accelerated Cost Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net income available to common stockholders Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Northern California Northern California [Member] Geographic region of business segment. Entity Information [Line Items] Entity Information [Line Items] Reveal The Reveal [Member] The Reveal [Member] Proceeds from sale of real estate Sale Price at Pro Rata Share Proceeds from Sale of Real Estate The Plaza The Plaza [Member] The Plaza Lines of credit Lines of credit and commercial paper Long-Term Line of Credit Number of properties held-for-sale Number of Assets Held For Sale Number of Assets Held For Sale Related Party Transaction [Table] Related Party Transaction [Table] Net income available to common stockholders (in dollars per share) Net income available to common unitholders (in dollars per share) Per common share/unit amount (in dollars per share) Earnings Per Share, Diluted Slater 116 Slater 116 [Member] Name of property acquired. 2030 Lessor, Operating Lease, Payment to be Received, Year Five Total capital Beginning balance Ending balance Partners' Capital, Including Portion Attributable to Noncontrolling Interest Supplemental disclosure of noncash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Palm Valley Palm Valley [Member] Membership Interest In Palm Valley [Member] Conversion ratio, incentive units Conversion Ratio, Incentive Units Conversion Ratio, Incentive Units Park Viridian Park Viridian [Member] Park Viridian Mello Roos [Member] Sale of stock (in shares) Sale of Stock, Number of Shares Issued in Transaction U.S. Treasury and agency securities US Treasury And Agency Securities [Member] US Treasury And Agency Securities Real Estate and Accumulated Depreciation [Line Items] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] Number of interest rate swaps Number Of Interest Rate Swaps Number Of Interest Rate Swaps Consolidation Items [Domain] Consolidation Items [Domain] Redeemable noncontrolling interest, units of limited partners' interests in DownREIT VIEs Redeemable Noncontrolling Interest, Equity, Carrying Amount, Variable Interest Entities Redeemable Noncontrolling Interest, Equity, Carrying Amount, Variable Interest Entities Auditor Location Auditor Location Net operating income Net operating income Gross Profit Other Membership Interest, Other, Expo and Country Towers [Member] Equity method investment pertaining to Membership interest in a limited liability company that owns and is developing Expo. Straight line rent concession Operating Lease, Change In Lease Income Operating Lease, Change In Lease Income Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Redemption value of variable interest entities Redemption Value Of Variable Interest Entities Description of redemption value of total variable interest entities units outstanding. Equity Forward Sale Agreements Equity Forward Sale Agreements [Member] Equity Forward Sale Agreements Marina City Club Marina City Club [Member] Marina City Club 1000 Kiely Kiely 1000 [Member] A 121-unit garden-style community located in Santa Clara, California. Patent 523 Patent 523 [Member] Patent 523 [Member] Total Long-Term Debt, Gross Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Other receivables from affiliates (2) Notes Receivable [Member] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer General Partner: General Partners' Capital Account [Abstract] Total lease payments Lessee, Operating Lease, Liability, to be Paid Change in fair value of marketable debt securities, net Change in fair value of marketable debt securities, net OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax ROEN Menlo Park ROEN Menlo Park [Member] ROEN Menlo Park Vesting percentage of units per year Vesting percentage of units per year This line item represents the vesting percentage of units per year. Municipal debt securities Municipal Debt Securities [Member] Municipal Debt Securities Distributions to noncontrolling interest Distributions to noncontrolling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Home Community Development in Burlingame, California Home Community Development in Burlingame, California [Member] Home Community Development in Burlingame, California [Member] Expiration Date Trading Arrangement Expiration Date Accumulated depreciation Balance at beginning of year Balance at the end of year SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation Other liabilities Increase (Decrease) in Other Operating Liabilities Management And Other Fees From Affiliates Management And Other Fees From Affiliates [Member] Management And Other Fees From Affiliates Related party transaction, amounts of transaction Related Party Transaction, Amounts of Transaction Equity: Capital: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Schedule of Co-Investment Equity Method Investments [Table Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Reclassifications due to change in redemption value and other Noncontrolling Interest, Reset Of Prior Year Redemptions Noncontrolling Interest, Reset Of Prior Year Redemptions Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Encumbered Apartment Communities Encumbered Apartment Communities [Member] Encumbered apartment communities. Fountain Court Fountain Court [Member] Fountain Court Audit Information [Abstract] Audit Information The Parc at Pruneyard Century Towers [Member] Century Towers Schedule of Disposition Activity Sales Of Real Estate Investments [Table Text Block] Sales Of Real Estate Investments Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures Marbrisa Marbrisa [Member] Marbrisa Park Catalina Park Catalina [Member] A 90-unit property located in the Koreatown submarket of Los Angeles, California. Proceeds from unsecured debt and mortgage notes Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Belmont Terrace Belmont Terrace [Member] Belmont Terrace Expected lives Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Woodland Commons Woodland Commons [Member] Woodland Commons Hillsborough Park Hillsborough Park [Member] Hillsborough Park Schedule of Notes and Other Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Weighted- average grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Monthly interest expense Long term Debt Monthly interest expense The mortgage interest expense on a monthly basis. Real Estate Property, Ownership [Table] Real Estate Property, Ownership [Table] Distributions in excess of accumulated earnings Accumulated Distributions in Excess of Net Income Average fair value of stock options granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Pure Redmond Pure Redmond [Member] Pure Redmond [Member] Marquis Marquis [Member] Marquis [Member] Wesco VII LLC Wesco VII LLC [Member] Wesco VII LLC Operating partnership units outstanding (in shares) Operating Partnership Units Outstanding Operating partnership units owned by noncontrolling interest partners, including Long Term Incentive Plan Units which convert to Partnership units. The Huxley The Huxley [Member] The Huxley [Member] Lessor, Lease, Description [Line Items] Lessor, Lease, Description [Line Items] Reoffer yield percentage Debt Instrument, Debt Offering Price, Re-Offer Yield Percentage Debt Instrument, Debt Offering Price, Re-Offer Yield Percentage Real estate structures Real Estate Structures [Member] Long lived, depreciable real estate structures held for productive use. Operating distributions from co-investments Proceeds from Equity Method Investment, Distribution Equity securities, FV-NI Equity Securities, FV-NI, Current TENTEN Downtown TENTEN Downtown [Member] TENTEN Downtown Antidilutive securities excluded from computation of earnings per share, amount (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2027 Long-Term Debt, Maturity, Year Two Other Property Other Property [Member] Company's share of net income Income (Loss) Attributable to Parent, before Tax Lease Agreements - Company as Lessee Lessee, Operating Leases [Text Block] Note receivable, secured, bearing interest at 9.00%, due October 2026 (Originated October 2021) Secured Note Receivable, 9.00% Interest Rate, Due October 2026 [Member] Secured Note Receivable, 9.00% Interest Rate, Due October 2026 Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Highlands at Wynhaven Highlands at Wynhaven [Member] Highlands at Wynhaven Measure: Measure [Axis] Provision for credit losses Financing Receivable, Credit Loss, Expense (Reversal) Hope Ranch Hope Ranch Collection [Member] Hope Ranch Collection Derivative fair value Derivative, Fair Value, Net Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Remaining authorized repurchase amount Share Repurchase Program, Remaining Authorized, Amount Montejo Montejo [Member] Montejo Total outstanding units, converted (in shares) Total Outstanding Units Converted The number of conversion made during the period on incentive units. SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Text Block] Fixed rate debt carrying amount Fixed Rate Debt, Carrying Amount Including the current and noncurrent portions, carrying value as of the balance sheet date of debt obligations and debt which accrues interest at a set, unchanging rate. Equity Method Investment [Table] Real Estate Investments, Net [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Gross amount carried at close of period SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Risk-free interest rates Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Entity Tax Identification Number Entity Tax Identification Number Term loan - variable rate, net Adjustment For Debt Issuance Costs, Gross Adjustment For Debt Issuance Costs, Gross Proceeds from dispositions of co-investments Proceeds from Sale of Equity Method Investments Outstanding at beginning of year (in dollars per share) Outstanding at end of year (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Highridge Highridge Apartments [Member] Highridge Apartments Change in fair value of derivatives and amortization of swap settlements Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] Assets related to variable interest entities net of intercompany eliminations Assets Related To Variable Interest Entities Net Intercompany Eliminations The carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE) net of intercompany eliminations. Common stock, shares issued (in shares) Common Stock, Shares, Issued Canyon Oaks Canyon Oaks [Member] Canyon Oaks Bridgeport Bridgeport [Member] Bridgeport The Elliot at Mukilteo The Elliot at Mukilteo [Member] The Elliot at Mukilteo Operating leases, weighted-average of remaining lease terms (years) Operating Lease, Weighted Average Remaining Lease Term 2029 Long-Term Debt, Maturity, Year Four Schedule of Changes in the Redemption Value of Redeemable Noncontrolling Interests Redeemable Noncontrolling Interest [Table Text Block] Entity Public Float Entity Public Float Annualized preferred return rate Equity Method Investments, Preferred Returns Rate Equity Method Investments, Preferred Returns Rate Interest expense Interest expense Interest expense Interest Expense, Nonoperating Corporate-level property management expenses Corporate-level property management expenses Corporate, Property Management Expenses Corporate, Property Management Expenses Trading Arrangement: Trading Arrangement [Axis] Mission Peaks II Mission Peaks II [Member] Mission Peaks II [Member] Total Shareholder Return Amount Total Shareholder Return Amount Rental and other property Total rental and other property revenues Operating Lease, Lease Income Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Other real estate assets Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Country Villas Country Villas [Member] Country Villas Schedule of Balance Sheet Information Related to Leases Schedule of Components of Leveraged Lease Investments [Table Text Block] 2027 Lessor, Operating Lease, Payment to be Received, Year Two Operating Partnership Units Operating Partnership Units [Member] Controlling units of ownership. Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Cortesia Cortesia At Rancho Santa Margarita [Member] Cortesia At Rancho Santa Margarita [Member] Number of consolidated co-investments that now meet the definition of a VIE Variable Interest Entity, Number Of Consolidated Co-investments Determined To Be Variable Interest Entities Variable Interest Entity, Number Of Consolidated Co-investments Determined To Be Variable Interest Entities Marcus and Millichap Company Marcus And Millichap Company [Member] An affiliate is a party that, directly or indirectly through one or more intermediaries, controls, is controlled by, or is under common control with the entity. Expenses: Operating Expenses [Abstract] Trabuco Villas Trabucco Villas [Member] Trabucco Villas Bel Air Bel Air [Member] Bel Air The Parc at Pruneyard The Parc At Pruneyard [Member] The Parc At Pruneyard Limited Partners: Limited Partners' Capital Account [Abstract] Statement [Line Items] Statement [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Forest View Forest View [Member] Forest View Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents-unrestricted Cash and cash equivalents - unrestricted Cash and Cash Equivalent Common equity (64,442,290 and 64,280,466 units issued and outstanding, respectively) General Partners' Capital Account Interest Rate Swap Three Interest Rate Swap Three [Member] Interest Rate Swap Three Real estate under development Real estate under development Development in Process Co-investment Co-Investment In Advance To Affiliates, Subsidiaries, Associates, And Joint Ventures Co-Investment In Advance To Affiliates, Subsidiaries, Associates, And Joint Ventures Gain on the sale of real estate and land Company's Share Of Gain On Sales Of Real Estate The Company's share of net gain or loss resulting from sales and other disposals of other real estate owned, increases and decreases in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession. Common stock Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Less: accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Net increase (decrease) in unrestricted and restricted cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Capitalization Policy Interest Capitalization, Policy [Policy Text Block] Common stock dividends (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Summary of Critical and Significant Accounting Policies Significant Accounting Policies [Text Block] Piedmont Piedmont [Member] Piedmont [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Short-term lease terms Lessor, Operating Lease, Renewal Term Related Party Transaction [Axis] Related Party Transaction [Axis] Weighted average interest rate Long-Term Debt, Weighted Average Interest Rate, at Point in Time Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Equity income from co-investments Gain Loss From Equity Method Investments This item represents the entity's proportionate share for the period of the net gain (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Real Estate [Domain] Real Estate [Domain] Ownership interests, number of commercial buildings Ownership Interests, Number Of Commercial Buildings The number of commercial buildings in which the company has an ownership interest. Boulevard Boulevard [Member] Boulevard Interest Rate Swap Interest Rate Swap [Member] Co-investment, committed capital Co-Investment, Committed Capital In Advance To Affiliates, Subsidiaries, Associates, And Joint Ventures Co-Investment, Committed Capital In Advance To Affiliates, Subsidiaries, Associates, And Joint Ventures Equity income from co-investments Equity income from co-investments Income (Loss) from Equity Method Investments Leases [Abstract] Leases [Abstract] Basic: Basic: Earnings Per Share, Basic [Abstract] 2029 Lessor, Operating Lease, Payment to be Received, Year Four Occupancy threshold for classification as stabilized Real Estate Operations, Occupancy Threshold For Classification As Stabilized Real Estate Operations, Occupancy Threshold For Classification As Stabilized Land and improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount Total operating and other co-investments, net Total operating co investments [Member] Equity method investment pertaining to the total operating co-investments. The Blake LA The Blake LA [Member] The Blake LA [Member] Summit Park Summit Park [Member] Summit Park Share-based Payment Arrangement, Noncash Expense [Abstract] Share-Based Payment Arrangement, Noncash Expense [Abstract] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net income available to common stockholders (in dollars per share) Net income available to common unitholders (in dollars per share) Per common share/unit amount (in dollars per share) Earnings Per Share, Basic BellCentre BellCentre [Member] BellCentre [Member] Commercial Paper Commercial Paper [Member] Esplanade San Diego Esplanade San Diego [Member] Esplanade San Diego Foothill Gardens/Twin Creeks Foothill Gardens Twin Creeks [Member] Foothill Gardens/Twin Creeks Bridle Trails Bridle Trails [Member] Bridle Trails Ground lease, number of leases Lessee, Operating Lease, Ground Lease, Number Of Leases Lessee, Operating Lease, Ground Lease, Number Of Leases Total other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Same-property Real Estate Property, Same Property [Member] Real Estate Property, Same Property [Member] Notes and Other Receivables Notes And Other Receivables [Text Block] Tabular disclosure of the various notes receivable and other receivables with corresponding amounts as of the balance sheet date. The receivables are presented as unclassified. Deferred revenue balance from contracts with remaining performance obligations Revenue, Remaining Performance Obligation, Amount Bond subject to interest rate caps Bond Subject To Interest Rate Caps The Bonds that are subject to interest rate cap agreements. Interest Rate Swap Two Interest Rate Swap Two [Member] Interest Rate Swap Two Affiliated Entity Affiliated Entity [Member] Issuance of Operating Partnership units for contributed properties Issuance Of Operating Partnership Units For Contributed Properties Issuance Of Operating Partnership Units For Contributed Properties Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Windsor Court Windsor Court [Member] Windsor Court 2014 LTIP Units 2014 LTIP Units [Member] 2014 LTIP Units Revere Campbell Revere Campbell [Member] Revere Campbell Number of common stock shares per unit basis (in shares) Number Of Common Stock Shares Per Unit Basis Number Of Common Stock Shares Per Unit Basis Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Tierra Vista Tierra Vista [Member] Tierra Vista Contributions to co-investments Payments to acquire equity method investments Payments to Acquire Equity Method Investments Share based compensation expense Share-Based Payment Arrangement, Expense Hedging Designation [Domain] Hedging Designation [Domain] Unsecured Bonds 2.650% Unsecured Bonds 2.650%, Due September 2050 [Member] Unsecured Bonds 2.650%, Due September 2050 Variable rate debt fair value Variable Rate Debt Fair Value The fair value of long-term borrowings, outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. Development acquisitions of and additions to real estate under development Payments to Develop Real Estate Assets Mortgage notes payable, net Secured Debt Total liabilities and equity Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Number of apartment communities owned Apartment communities owned (in communities) Number Of Apartment Communities Owned The number of apartment communities owned as of the balance sheet date. Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Allure at Scripps Ranch Allure [Member] Allure [Member] The Grand Grand [Member] The Grand ROEN Menlo Park ARLO Mountain View [Member] ARLO Mountain View Equity Method Investment [Table] Equity Method Investment [Table] Accounting Policies [Abstract] Accounting Policies [Abstract] Schedule of Maturity Analysis of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Repayments of secured debt Repayments of Secured Debt Unrecaptured section 1250 capital gain Status of Cash Dividend Unrecaptured section 1250 capital gain loss percentage The portion of cash dividends distributed during the period relating to unrecaptured section 1250 capital gain (loss). Pay vs Performance Disclosure [Line Items] Operating lease liabilities Present value of lease liabilities Operating Lease, Liability Apartment Homes Number Of Apartment Units Number Of Apartment Units Total Lessor, Operating Lease, Payment to be Received Commerical Paper Program Commerical Paper Program [Member] Commerical Paper Program Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Issuance of OP units to noncontrolling interest Noncontrolling Interest, Increase from Business Combination Disposition of real estate and other SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Deduction Debt instrument, debt offering price, percentage of principal amount Debt Instrument, Debt Offering Price, Percentage Of Principal Amount Debt Instrument, Debt Offering Price, Percentage Of Principal Amount Auditor [Line Items] Auditor [Line Items] Villa Angelina Villa Angelina [Member] Villa Angelina Carmel Landing Carnel Landing [Member] Carnel Landing [Member] Catalina Gardens Catalina Gardens [Member] Catalina Gardens [Member] Rental properties: SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] Capital expenditures on rental properties Revenue generating capital expenditures The cash outflow for revenue generating capital improvements to properties. Accounts payable, accrued liabilities, and operating lease liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Redemptions of redeemable noncontrolling interest Redemptions of redeemable noncontrolling interest Payments for Repurchase of Redeemable Noncontrolling Interest Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Number of lines of credit Line Of Credit Facility, Number Of Lines Of Credit Line Of Credit Facility, Number Of Lines Of Credit Number of company settled lawsuits Loss Contingency, Claims Settled, Number Comprehensive income attributable to controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Secured debt Secured Debt [Member] Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] Equity, Attributable to Noncontrolling Interest [Roll Forward] Class of Stock [Line Items] Class of Stock [Line Items] Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Partner Capital Components [Domain] Partner Capital Components [Domain] Meadowood Meadowood [Member] Meadowood Common stock, aggregate gross sales price Common Stock, Aggregate Gross Sales Price Common Stock, Aggregate Gross Sales Price Unsecured Debt Unsecured Debt [Member] Commitment to fund preferred equity investment in the project Equity Method Investment, Commitment To Fund, Amount Equity Method Investment, Commitment To Fund, Amount Variable rate debt carrying amount Variable Rate Debt, Carrying Amount The portion of the carrying amount of long-term borrowings, outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. Woodside Village Woodside Village [Member] Woodside Village Total debt Total Total mortgage notes payable Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Dividend Distribution [Table] Dividend Distribution [Table] Dividend Distribution Total assets Total assets Assets Unsecured Bonds 3.000% Unsecured Bonds 3.000%, Due January 2030 [Member] A debt security, in which the authorized issuer owes the holders a debt and is obliged to repay the principal and interest (the coupon) at a later date Lafayette Highlands Lafayette Highlands [Member] Lafayette Highlands [Member] Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value The Audrey at Belltown The Audrey at Belltown [Member] The Audrey at Belltown [Member] Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Total partners’ capital Partners' Capital Schedule of Acquisition Activity Acquired Real Estate Investments [Table Text Block] Acquired Real Estate Investments [Table Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Radius Radius [Member] Radius [Member] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Receivable Type [Axis] Receivable Type [Axis] Pathways at Bixby Village Pathways [Member] Pathways Township Township [Member] Township [Member] Marina Cove Marina Cove [Member] Marina Cove Number of properties securing mortgage notes Number of Properties Securing Mortgage Notes Refers to number of properties securing mortgage notes. Depreciation expense SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Depreciation Expense Waterford Place Waterford Place [Member] Waterford Place Total rental properties Real Estate Investment Property, at Cost Distributions declared Partners' Capital Account, Distributions Essex Skyline Essex Skyline [Member] Essex Skyline Mesa Village Mesa Village [Member] Mesa Village Net Income Per Common Share and Net Income Per Unit [Table] Net Income Per Common Share and Net Income Per Unit [Table] Disclosures of net income per share and net income per unit. General Partner General Partner [Member] Common stock dividends (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Unsecured Bonds 3.875% Unsecured Bonds 3.875% [Member] Unsecured Bonds 3.875% [Member] Note receivable, secured, bearing interest at 12.00%, due January 2025 (Originated August 2022) Secured Note Receivable, 12.00% Interest Rate, Due January 2025 [Member] Secured Note Receivable, 12.00% Interest Rate, Due January 2025 Total lease liabilities Lease, Liability Lease, Liability Leased assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 5600 Wilshire 5600 Wilshire [Member] 5600 Wilshire [Member] Lease, Cost [Abstract] Lease, Cost [Abstract] Carmel Summit Carnel Summit [Member] Carnel Summit [Member] Option to increase Line Of Credit Facility, Increase Option, Maximum Borrowing Capacity Line Of Credit Facility, Increase Option, Maximum Borrowing Capacity Vista Belvedere Vista Belvedere [Member] Vista Belvedere Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Bennett Lofts Bennett Lofts [Member] A 147 unit apartment community located in San Francisco, California. Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Office lease, renewal term Lessee, Operating Lease, Office Lease, Renewal Term Lessee, Operating Lease, Office Lease, Renewal Term Business Combination [Domain] Business Combination [Domain] Related Party Related Party [Member] Taylor 28 Taylor 28 [Member] Taylor 28 [Member] Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Artizan Artizan [Member] Artizan Ground lease, renewal term Lessee, Operating Lease, Ground Lease, Renewal Term Lessee, Operating Lease, Ground Lease, Renewal Term Beaumont Beaumont [Member] Beaumont Pinnacle at MacArthur Place Pinnacle at MacArthur Place [Member] Pinnacle at MacArthur Place [Member] Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Apartment Home Community in Ventura, California Apartment Home Community In Ventura, California [Member] Apartment Home Community In Ventura, California [Member] Apartment Home Community Located In Los Angeles Apartment Home Community Located In Los Angeles [Member] Apartment Home Community Located In Los Angeles Volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Bonds public offering - fixed rate, net Fixed Rate Bond [Member] Debt security, in which the authorized issuer owes the holder a debt and is obliged to repay the principal and interest (the coupon). Line of Credit Working Capital Line of Credit Working Capital [Member] Line of credit working capital. Unrestricted and restricted cash and cash equivalents at beginning of year Unrestricted and restricted cash and cash equivalents at end of year Total unrestricted and restricted cash and cash equivalents shown in the consolidated statements of cash flows Cash and cash equivalents, including restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative fair value Derivative Asset Purchases of marketable securities Payments to Acquire Marketable Securities Crow Canyon Crow Canyon [Member] Crow Canyon [Member] Noncontrolling interest in limited partnerships Noncontrolling Interest in Limited Partnerships Number of extension options (in extensions) Debt Instrument, Term, Extension Period Debt Instrument, Term, Extension Period Emerson Valley Village Emerson Valley Village [Member] Emerson Valley Village [Member] Product and Service [Domain] Product and Service [Domain] Available for sale debt securities: Debt Securities, Available-for-Sale [Abstract] Land and land improvements Land and Land Improvements Commercial lease terms Lessor, Operating Lease, Commercial Lease, Renewal Term Lessor, Operating Lease, Commercial Lease, Renewal Term Real Estate Under Development Real Estate Under Development [Member] Real Estate Under Development Changes in refundable deposits Increase (Decrease) In Refundable Deposits Increase (Decrease) In Refundable Deposits Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 2028 Lessor, Operating Lease, Payment to be Received, Year Three Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Sage at Cupertino Sage at Cupertino [Member] Membership Interest In Sage At Cupertino [Member] Unsecured Bonds 3.625% Unsecured Bonds 3.625% [Member] A debt security, in which the authorized issuer owes the holders a debt and is obliged to repay the principal and interest (the coupon) at a later date. Fox Plaza Fox Plaza [Member] Fox Plaza Derivative notional amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Essex Skyline Essex Skyline Apartment [Member] Essex Skyline Apartment Sammamish View Sammamish View [Member] Sammamish View 101 San Fernando 101 San Fernando [Member] 101 San Fernando [Member] Domaine Domaine [Member] A 92 unit property located in Seattle, Washington. City Area Code City Area Code Schedule of Allowance For Credit Losses Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Villa Granada Villa Granada [Member] Villa Granada [Member] Gain (loss) from litigation settlement Gain (Loss) from Litigation Settlement The Galloway The Galloway [Member] The Galloway Mortgages Mortgages [Member] Bristol Commons Bristol Commons [Member] Bristol Commons Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and administrative General and administrative General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Date of construction Real Estate And Accumulated Depreciation Period Date Of Construction Date the property was constructed. Employer matching contribution, percent Defined Contribution Plan, Employer Matching Contribution, Percent of Match Related Party Transactions [Abstract] Related Party Transactions [Abstract] Total lease cost Lease, Cost Variable rate mortgage notes payable Variable Rate Mortgage Notes Payable Multifamily Housing Mortgage Revenue Bonds [Member] Multifamily housing mortgage revenue bonds. Other liabilities Other liabilities Other Liabilities Marketable securities Equity securities, carrying value Marketable securities Equity Securities, FV-NI Schedule of Components of Lease Expense/Discount Rate Information Lease, Cost [Table Text Block] Joint venture ownership percent Joint Venture Ownership Percent Joint Venture Ownership Percent Prepaid Expenses and Other Assets Prepaid Expenses and Other Current Assets [Member] Redemption of preferred equity investments upon acquisition or consolidation of co-investments Redemption Of Preferred Equity Investments Upon Acquisition Or Consolidation Of Co-Investments Redemption Of Preferred Equity Investments Upon Acquisition Or Consolidation Of Co-Investments Apartment Homes SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Number of Units Unsecured Bonds 2.650% Unsecured Bonds 2.650%, Due March 2032 [Member] Unsecured Bonds 2.650%, Due March 2032 Auditor Name Auditor Name Cash and marketable securities Investments and Cash Ellington Ellington at Bellevue [Member] Ellington at Bellevue [Member] Gain on sale of real estate and land Gain on sale of real estate and land Gains (Losses) on Sales of Investment Real Estate Weighted average assumptions used to estimate fair value of stock options [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Parkwood at Mill Creek Parkwood at Mill Creek [Member] Parkwood at Mill Creek [Member] Montanosa Montarosa [Member] Montarosa [Member] Corbella at Juanita Bay Corbella at Juanita Bay [Member] 169-unit apartment community located in Kirkland, Washington. Weighted- average exercise price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Schedule of Restricted Cash Reconciliation Restrictions on Cash and Cash Equivalents [Table Text Block] Cedar Terrace Cedar Terrace [Member] Cedar Terrace Marketable Securities Marketable Securities, Policy [Policy Text Block] Apartment lease term Apartment Lease Term Apartment Lease Term 2026 Lessor, Operating Lease, Payment to be Received, Year One Number of apartment communities sold Number Of Apartment Communities Sold Number Of Apartment Communities Sold Related Party [Domain] Related and Nonrelated Parties [Domain] Cap on the appreciation of the market price over the exercise price Share-based Compensation Arrangement by Share-based Payment Award, Cap On Appreciation of The Market Price Over The Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Cap On Appreciation of The Market Price Over The Exercise Price Interior apartment home improvements Interior Apartment Home Improvements [Member] Interior Apartment Home Improvements Derivative Instrument [Axis] Derivative Instrument [Axis] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] New Credit Facility New Credit Facility [Member] New Credit Facility Bernardo Crest Bernardo Crest [Member] Bernardo Crest [Member] Entity [Domain] Entity [Domain] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Co-investments Co-investment Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Expected timing of performance obligation satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Salmon Run at Perry Creek Salmon Run at Perry Creek [Member] Salmon Run at Perry Creek Station Park Green Station Park Green - Phases I, II, and III [Member] Station Park Green - Phases I, II, and III Cash paid for interest, net of capitalized interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Unsecured Bonds 4.875% Unsecured Bonds 4.875%, Due February 2036 [Member] Unsecured Bonds 4.875%, Due February 2036 Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset The Cairns Cairns [Member] Cairns, The Operating lease cost Operating Lease, Cost Equity Method Investment, Summarized Financial Information [Abstract] Equity Method Investment, Summarized Financial Information [Abstract] Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Plan Name [Domain] Plan Name [Domain] Expensed acquisition and investment related costs Expensed acquisition and investment related costs Business Combination, Acquisition-Related Cost, Expense Unrecognized compensation cost, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Equity [Abstract] Equity [Abstract] Total co-investment Total Co-Investment [Member] Equity method investment pertaining to total co investment. The Avery Avery, The [Member] Avery, The [Member] Bellerive Bellerive [Member] A completed 63-unit vacant condominium project that the Company operates as a rental community located in West Los Angeles. CPPIB Interest Canadian Pension Plan Investment Board (CPPIB or CPP), San Francisco, CA [Member] Canadian Pension Plan Investment Board (CPPIB or CPP), San Francisco, CA [Member] Schedule of Cash Dividends Distributed Schedule of Status Cash Dividends Distributed [Table Text Block] Tabular disclosure of the status of cash dividends distributed for the reporting period. Interest Rate Protection, Swap, and Forward Contracts Derivatives, Policy [Policy Text Block] Segment Information Segment Reporting Disclosure [Text Block] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Senior Unsecured Notes Maturing April 1, 2025 Senior Unsecured Notes Maturing April 1, 2025 [Member] Senior Unsecured Notes Maturing April 1, 2025 [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Pinnacle at Talega Pinnacle at Talega [Member] Pinnacle at Talega [Member] Camino Ruiz Square Camino Ruiz Square [Member] Camino Ruiz Square Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Collections of notes and other receivables Proceeds from Sale and Collection of Receivables Schedule of Changes in Accumulated Other Comprehensive Income, Net by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Preferred equity investment, funded loan commitments Preferred Equity Investment, Funded Loan Commitments Preferred Equity Investment, Funded Loan Commitments One Hundred Grand Maxwell Sunnyvale [Member] Maxwell Sunnyvale Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Increase (Decrease) in Partners' Capital [Roll Forward] Increase (Decrease) in Partners' Capital [Roll Forward] Percentage of units subject to tenant income criteria Percentage of units subject to tenant income criteria The percentage of units subject to tenant income criteria under the multifamily housing mortgage bonds loan agreement. Interest rate Notes Receivable, Interest Rate Notes Receivable, Interest Rate Redemption value of operating partnership units outstanding Redemption Value Of Operating Partnership Units Outstanding Description of redemption value of total operating partnership units. Partner Capital Components [Axis] Partner Capital Components [Axis] Arrangement Duration Trading Arrangement Duration Property casualty insurance deductible per incident Property Casualty Insurance, Deductible Per Incident, Maximum Amount of risk retained by the entity before the insurance arrangement begins to provide coverage. Additions to deferred charges Payment of Financing and Stock Issuance Costs Seattle Metro Seattle Metro [Member] Geographic region of business segment. Segments [Axis] Segments [Axis] Limited Partners Limited Partner [Member] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Form 15 Form 15 [Member] Form 15 [Member] Thereafter Thereafter Long-Term Debt, Maturity, after Year Five Equity Based Compensation Plans Share-Based Payment Arrangement [Text Block] Common equity (2,250,339 and 2,331,251 units issued and outstanding, respectively) Limited Partners' Capital Account Elevation Elevation [Member] Elevation. Emerald Pointe Emerald Pointe [Member] Emerald Pointe [Member] ASSETS Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Common stock, preferred stock and stock funds Common Stock, Preferred Stock, And Stock Funds [Member] Common Stock, Preferred Stock, And Stock Funds Debt Instrument [Axis] Debt Instrument [Axis] Forfeited and canceled (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Units of limited partnership interest amount (in shares) Units Of Limited Partnership Interest Amount DownREIT Partnership's Outstanding operating partnership units owned by noncontrolling interest partners. Loss on early retirement of debt Loss on early retirement of debt Gain (Loss) on Extinguishment of Debt Credit Facility [Domain] Credit Facility [Domain] Buildings and improvements Investment Building and Building Improvements Foster’s Landing Foster's Landing [Member] Foster's Landing [Member] Villa Siena Villa Siena [Member] Villa Siena [Member] Coupon rate Coupon Rate Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Tiffany Court Tiffany Court [Member] Tiffany Court [Member] Entity Voluntary Filers Entity Voluntary Filers The Landing at Jack London Square The Landing at Jack London Square [Member] The Landing at Jack London Square [Member] Lines of credit and commercial paper Lines Of Credit And Commercial Paper Lines Of Credit And Commercial Paper Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Paragon Paragon [Member] Name of property acquired. Revenues From Development And Redevelopment Fees Revenues From Development And Redevelopment Fees [Member] Revenues From Development And Redevelopment Fees Accumulated depreciation - Disposals and other SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Other Deduction Unsecured Term Loan 0.850%, Due May 2028 Unsecured Term Loan 0.850%, Due May 2028 [Member] Unsecured Term Loan 0.850%, Due May 2028 Unsecured Line of Credit Unsecured Line of Credit [Member] Line of credit facility. Redevelopment Redevelopment expenditures The cash outflow for capital improvements to properties currently under redevelopment. Muse Muse [Member] 152-unit apartment community under development located in the North Hollywood Arts District of Los Angeles, California. Equity based compensation costs Partners' Capital Account, Stock and unit based compensation costs Total change in each class of partners' capital accounts during the year due to stock and unit-based compensation. All partners include general, limited and preferred partners. Mortgage Notes Payable Mortgage Notes Payable Disclosure [Text Block] Monthly principal amortization Long term Debt Monthly principal amortization The monthly amount of principal payable on mortgage loans on real estate. Number of operating segments Number of Operating Segments Annaliese Annaliese [Member] Annaliese Intrinsic value of vested and unvested LTIP units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Total unsecured debt Unsecured Debt And Line Of Credit Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer) and the carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Related Party [Axis] Related and Nonrelated Parties [Axis] Schedule of Unsecured Debt Schedule Of Unsecured Debt And Line Of Credit [Table Text Block] Tabular disclosure of information pertaining to long-debt instruments, line of credit or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. Restatement Determination Date: Restatement Determination Date [Axis] Stock option and restricted stock plans, net General partner’s stock based compensation, net Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Number of apartment units owned Aggregate Apartment Units Owned Aggregate number of apartment units owned as of the balance sheet date. Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Capitalized internal costs related to development and redevelopment projects Capitalized Internal Costs Related To Development And Redevelopment Projects The amount of for cost of asset previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets. Parkside Court Parkside Court [Member] Parkside Court Stated interest rate SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate Amounts reclassified from accumulated other comprehensive income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Bella Villagio Bella Villagio [Member] 231-unit community located in San Jose, California. Name Trading Arrangement, Individual Name Related Party Bridge Loan On Property Acquired By BEX II Related Party Bridge Loan On Property Acquired By BEX II [Member] Related Party Bridge Loan On Property Acquired By BEX II Computer software and equipment Computer Software and Equipment [Member] Capitalized costs of purchased software applications and long lived, depreciable assets that are used in the creation, maintenance and utilization of information systems. Rental income Rental [Member] Rental [Member] Mortgage Notes Mortgage Notes [Member] Mortgage note is a promissory note secured by a specified mortgage loan, it is a written promise to repay a specified sum of money plus interest at a specified rate and length of time to fulfill the promise. Redemptions of noncontrolling interest Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Debt instrument face amount Debt Instrument, Face Amount Marketable securities, amortized cost Marketable Securities, Amortized Cost Marketable Securities, Amortized Cost Alessio Alessio [Member] Alessio [Member] Schedule of Long Term Incentive Plan - Z Units Share-Based Payment Arrangement, Activity [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Stevenson Place Stevenson Place [Member] Stevenson Place Name Awards Close in Time to MNPI Disclosures, Individual Name Real Estate Rental Property Real Estate, Rental Property [Member] Real Estate, Rental Property [Member] Unvested at beginning of year (in dollars per share) Unvested at end of year (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Unsecured Bonds 5.500% Unsecured Bonds 5.500%, Due April 2034 [Member] Unsecured Bonds 5.500%, Due April 2034 The Waterford The Waterford [Member] The Waterford ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Avondale at Warner Center Avondale at Warner Center [Member] Avondale at Warner Center Debt offering price Debt Instrument, Debt Offering Price, Percentage of Par Value The percentage of debt offering price at par value during the period. Equity based compensation costs APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Non-residential/other, net Real Estate Property, Non-Residential/Other, Net [Member] Real Estate Property, Non-Residential/Other, Net [Member] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Fairwood Pond Fairwood Pond [Member] Fairwood Pond Intrinsic value of the options outstanding and fully vested Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value AOCI Including Portion Attributable to Noncontrolling Interest AOCI Including Portion Attributable to Noncontrolling Interest [Member] Lessor, Lease, Description [Table] Lessor, Lease, Description [Table] Auditor Firm ID Auditor Firm ID Segments [Domain] Segments [Domain] Park West Park West [Member] A 126 unit apartment community located in San Francisco, California. Regency Palm Court Regency Palm Court [Member] Regency Palm Court Equity securities, unrealized gain (loss) Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss), Before Tax Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss), Before Tax Other receivables Other Receivables [Member] Information on other receivables. Revenues and Gains on Sale of Real Estate and Land Revenue [Policy Text Block] Stock price (in dollars per share) Stock price The average stock price for the period under review. Senior Notes Senior Notes [Member] Pinnacle on Lake Washington Pinnacle on Lake Washington [Member] Pinnacle on Lake Washington [Member] All Executive Categories All Executive Categories [Member] Southern California Southern California [Member] Geographic region of business segment. Reed Square Reed Square [Member] A 100 unit community located in Sunnyvale, California. Common stock; $0.0001 par value, 670,000,000 shares authorized; 64,442,290 and 64,280,466 shares issued and outstanding, respectively Common Stock, Value, Issued Income allocated to convertible OP Units Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Commitments and contingencies (Note 17) Commitments and Contingencies One Hundred Grand One Hundred Grand [Member] One Hundred Grand Business Combination [Axis] Business Combination [Axis] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Variable Rate Term Loan Loans Payable [Member] Dividend Distribution [Line Items] Dividend Distribution [Line Items] Dividend Distribution [Line Items] Noncontrolling interest Noncontrolling Interest [Member] Unencumbered Apartment Communities Unencumbered Apartment Communities [Member] Unencumbered apartment communities/ Ownership percentage Equity Method Investment, Ownership Percentage Thereafter Lessor, Operating Lease, Payment to be Received, after Year Five Stabilized Apartment Home Community Located In Oakland Stabilized Apartment Home Community Located In Oakland [Member] Stabilized Apartment Home Community Located In Oakland Number of extension options Debt Instrument, Terms, Number Of Extension Options Debt Instrument, Terms, Number Of Extension Options PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Interest Rate Swap One Interest Rate Swap One [Member] Interest Rate Swap One Forfeited and canceled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Unsecured Bonds 3.375% Unsecured Bonds 3.375% Unsecured Bonds 3.375%, Due April 2026 [Member] Unsecured Bonds 3.375%, Due April 2026 [Member] Diluted: Diluted: Earnings Per Share, Diluted [Abstract] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] 401(k) Plan Defined Contribution Plan [Text Block] Number of derivative instruments held Derivative, Number of Instruments Held Derivative, Name [Domain] Derivative Contract [Domain] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Gain on sale of real estate Gain (Loss) on Disposition of Oil and Gas and Timber Property Net costs from issuance of common stock Net costs from issuance of common units Proceeds from Issuance of Common Stock Derivative hedged item Derivative, Amount of Hedged Item All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] The Stuart The Stuart at Sierra Madre [Member] The Stuart at Sierra Madre [Member] Ascent Ascent [Member] A 90 unit community located in Kirkland, Washington. Name Forgone Recovery, Individual Name Interest capitalized Interest Paid, Capitalized, Investing Activity Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Number of communities owned Number Of Communities Owned Number Of Communities Owned Weighted average interest rate Debt, Weighted Average Interest Rate Limited partner - ownership percentage Noncontrolling Interest Operating Partnership Noncontrolling interest in Operating Partnership, which includes the Operating Partnership's vested long term incentive plan units and cumulative redeemable preferred units. Esplanade Esplanade [Member] Esplanade Percentage of estimated fair value of shares Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Wharfside Pointe Wharfside Pointe [Member] Wharfside Pointe Wesco V, LLC Wesco V, LLC [Member] Wesco V, LLC Hillcrest Park Hillcrest Park [Member] Hillcrest Park Gain (loss) on sale of properties Gain (Loss) on Sale of Properties Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] The Carlyle The Carlyle [Member] The Carlyle Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Miracle Mile/Marbella Miracle Mile Marbella [Member] Miracle Mile/Marbella Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Debt instrument, debt offering price, effective yield percentage Debt Instrument, Debt Offering Price, Effective Yield Percentage Debt Instrument, Debt Offering Price, Effective Yield Percentage Lease Agreements - Company as Lessor Lessor, Operating Leases [Text Block] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Number of commercial buildings under lease agreements Lessor, Operating Lease, Number Of Commercial Buildings Under Lease Agreements Lessor, Operating Lease, Number Of Commercial Buildings Under Lease Agreements Total real estate Total Real Estate, Net The net book value of real estate property held for investment or construction in progress and investments in joint ventures. Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Equity securities: Marketable Security, Gain (Loss) [Abstract] Title of 12(b) Security Title of 12(b) Security Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Debt financed by seller in connection with acquisition Debt Financed By Seller In Connection With Acquisition Debt Financed By Seller In Connection With Acquisition Maximum amount authorized Debt Instrument, Covenant, Maximum Debt Outstanding Debt Instrument, Covenant, Maximum Debt Outstanding Equity Method Investment, Financial Statement, Reported Amounts [Abstract] Equity Method Investment, Financial Statement, Reported Amounts [Abstract] Investment interest acquired Equity Method Investment, Ownership Percentage Acquired Equity Method Investment, Ownership Percentage Acquired Fourth & U Fourth & U Apartment [Member] Fourth & U Apartment Per share data: Earnings Per Share [Abstract] Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Status of dividend total cash dividends distributed percentage Status of Dividend Total cash dividends distributed percentage The total cash dividends distributed during the period. Evergreen Heights Evergreen Heights [Member] Evergreen Heights Non-operating distributions from co-investments Proceeds from Equity Method Investment, Distribution, Return of Capital Debt assumed in connection with acquisition Noncash or Part Noncash Acquisition, Debt Assumed Retirement of common stock, net Retirement of common units, net Treasury Stock, Retired, Par Value Method, Amount Rental properties and real estate under development Rental Properties And Real Estate Development In Process Rental Properties And Real Estate Development In Process Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Proceeds from lines of credit and commercial paper Proceeds From Lines Of Credit And Commercial Paper Proceeds From Lines Of Credit And Commercial Paper Laurels at Mill Creek Laurels at Mill Creek [Member] The Laurels at Mill Creek Debt instrument, repaid, principal Debt Instrument, Repaid, Principal Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] The Henley I/The Henley II The Henley I and II [Member] The Henley I and II [Member] Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Foothill Commons Foothill Commons [Member] Foothill Commons Apex Apex [Member] Name of property acquired. Award Timing Disclosures [Line Items] Debt instrument, debt offering price, percentage of principal Debt Instrument, Debt Offering Price, Percentage Of Principal Fixed rate debt fair value Fixed Rate Debt, Fair Value Fair value of the current and noncurrent portions, as of the balance sheet date, of debt obligations and debt which accrues interest at a set, unchanging rate. Repayments of lines of credit and commercial paper Repayments Of Lines Of Credit And Commercial Paper Repayments Of Lines Of Credit And Commercial Paper Rental properties: Real Estate Investment Property, at Cost [Abstract] Other comprehensive (loss) income before reclassification Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Equity Transactions Equity [Text Block] Partner Type [Axis] Partner Type [Axis] Apartment Homes Apartment homes Number Of Units Acquired Number of units acquired. Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Capri at Sunny Hills Capri at Sunny Hills [Member] Capri at Sunny Hills Net real estate Net reportable operating segments - real estate assets Real Estate Investment Property, Net Total Balance at beginning of year Balance at the end of year SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross Share-based payment award, award vesting Period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Retirement of common stock Retirement of common units Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Mirabella Mirabella [Member] Mirabella Earnings from operations Operating Income (Loss) Line of Credit Line of Credit [Member] Unrealized gain on available for sale debt securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest [Member] Acquisitions of real estate and acquisition related capital expenditures, net of cash acquired Payments to Acquire Real Estate Agora Agora [Member] Agora Name of Property [Axis] Name of Property [Axis] Unsecured Bonds 3.375% Unsecured Bonds 3.375%, Due January 2023 [Member] Unsecured Bonds 3.375%, Due January 2023 Schedule of Financial Information of Co-Investments Summarized Financial Information For Co Investment Accounted For Under The Equity Method [Table Text Block] Summarized financial statement for co investment accounted for under the equity method. Number of OP units issued Number Of OP Units Issued Number Of OP Units Issued Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Class of Stock [Axis] Class of Stock [Axis] Notes Payable [Abstract] Notes Payable [Abstract] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Statement [Table] Statement [Table] Commitment to unfund preferred equity investment in the project Equity Method Investments, Purchase Commitment, Remaining Unfunded Amount Equity Method Investments, Purchase Commitment, Remaining Unfunded Amount Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Liabilities related to variable interest entities net of intercompany eliminations Liabilities Related To Variable Interest Entities Net Of Intercompany Eliminations The carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE) net intercompany eliminations. Beginning balance (in shares) Ending balance (in shares) Partners' Capital Account, Units Office leases, number of contracts Lessee, Operating Lease, Office Leases, Number Of Leases Lessee, Operating Lease, Office Leases, Number Of Leases Beginning balance (in shares) Ending balance (in shares) Shares, Issued Ashton Sherman Village Ashton Sherman Village [Member] Ashton Sherman Village [Member] Deferred revenue Contract with Customer, Liability Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Retirement of common stock, net (in shares) Retirement of common units, net (in shares) Treasury Stock, Shares, Retired Amendment Flag Amendment Flag Weighted average forward price (in dollars per share) Sale of Stock, Price Per Share Number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Fairway at Big Canyon Fairway at Big Canyon [Member] Fairway at Big Canyon Co-investments Oil and Gas and Mining, Proportionate Consolidation, Interest in Unincorporated Joint Venture or Partnership [Policy Text Block] Proceeds from dispositions of real estate Proceeds from Sale, Real Estate, Held-for-Investment Termination Date Trading Arrangement Termination Date Apartment Building Apartment Building [Member] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Receivable from preferred equity investment sponsor Related Party Note Receivable, Bearing Variable Rate Interest, Due October 2024 [Member] Related Party Note Receivable, Bearing Variable Rate Interest, Due October 2024 Receivable [Domain] Receivable [Domain] Net Income Per Share and Net Income Per Unit [Line Items] Net Income Per Share and Net Income Per Unit [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Total return swap income Derivative, Gain on Derivative Operating leases, weighted-average of discount rates Operating Lease, Weighted Average Discount Rate, Percent Schedule of Options Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted average number of shares outstanding during the year (in shares) Weighted average number of common units outstanding during the year (in shares) Weighted average common shares/units (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Net Income Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Exercisable at year end (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Related Party Transaction [Domain] Related Party Transaction [Domain] Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Connolly Station Connolly Station [Member] Connolly Station Property operating expenses Cost of Revenue Stonehedge Village Stonehedge Village [Member] Stonehedge Village Multifamily housing mortgage revenue bonds, variable interest rate (in hundredths) Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate Debt Disclosure [Abstract] Debt Disclosure [Abstract] Pinehurst Pinehurst [Member] Pinehurst Casualty loss Casualty loss Casualty Loss Casualty Loss Avenue 64 Avenue 64 [Member] Avenue 64 [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Park Highland Park Highland [Member] Park Highland [Member] Wesco I, Wesco III, and Wesco IV Wesco I, Wesco III, and Wesco IV [Member] Wesco I, Wesco III, and Wesco IV Accounting Estimates Use of Estimates, Policy [Policy Text Block] Unsecured Bonds 3.625% Unsecured Bonds 3.625%, Due May 2027 [Member] Unsecured Bonds 3.625%, Due May 2027 [Member] Montebello Montebello [Member] A 248 unit property located in Kirkland, Washington. Wesco I, Wesco III, Wesco IV, Wesco V and Wesco VI Wesco I, Wesco III, Wesco IV, Wesco V, and Wesco VI [Member] Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Belmont Station Belmont Station [Member] Belmont Station Bonita Cedars Bonita Cedars [Member] Bonita Cedars Belcarra Belcarra [Member] Belcarra [Member] Total liabilities Debt Liabilities Bothell Ridge Bothell Ridge [Member] Bothell Ridge Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Castle Creek Castle Creek [Member] Castle Creek Aggregate principal amount Debt Instrument, Repurchased Face Amount Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Lakeshore Landing Lakeshore Landing [Member] Lakeshore Landing [Member] Total outstanding units, beginning balance (in shares) Total outstanding units, ending balance (in shares) Total Outstanding Units The number of incentive units, that validly exist and are outstanding as of the balance sheet date. Number of OP units agreed price, per unit Number Of OP Units Agreed Price, Per Unit Number Of OP Units Agreed Price, Per Unit Sale of common stock, net Sale of common stock by general partner, net Stock Issued During Period, Value, New Issues Village Green Village Green [Member] Village Green [Member] Unamortized debt issuance expense Unamortized debt issuance expense Unamortized Debt Issuance Expense Consolidation Items [Axis] Consolidation Items [Axis] DownREIT limited partnerships consolidated by company (in partnerships) Number Of Downreit Limited Partnerships Consolidated By Company The number of DownREIT limited partnerships the company consolidates. Enso Enso [Member] Enso [Member] Counterparty Name [Axis] Counterparty Name [Axis] Property operating expenses, including real estate taxes Cost of Other Property Operating Expense And Real Estate Taxes Cost of Other Property Operating Expense And Real Estate Taxes Total rental and other property revenues Rental And Other Property Revenues [Member] Rental And Other Property Revenues [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt securities Corporate Debt Securities [Member] Reclassifications (from) to redeemable noncontrolling interest (to) from additional paid in capital and noncontrolling interest Reclassification (From) To Redeemable Noncontrolling Interest Reclassification (From) To Redeemable Noncontrolling Interest Threshold useful life of assets for capitalization Threshold Useful Life of Assets for Capitalization Threshold useful life of assets for capitalization.