Dividends and distributions paid per share and unit.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-4

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- Definition

Amount of cash distribution paid to unit-holder of limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

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- Definition

Amount of difference between the carrying amount and the sales price of real estate properties sold as part of discontinued operations.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Total distributions to each class of partners (i.e., general, limited and preferred partners).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

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Balance Type:	debit
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- Definition

The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

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- Definition

The cash outflow associated with the purchase of real estate held-for-investment and real estate joint ventures.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

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- Definition

The cash inflow from the sale of real estate held-for-investment and real estate joint ventures.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

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Significant Transactions (Details) $ / shares in Units, $ in Thousands				3 Months Ended			9 Months Ended
	Jun. 28, 2025 USD ($) $ / shares	Jun. 11, 2025 $ / shares	Aug. 01, 2024 USD ($) $ / shares	Sep. 30, 2025 USD ($)	Mar. 31, 2025 USD ($) apartment $ / shares shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) $ / shares	Nov. 12, 2025 apartment	Sep. 30, 2025 property	Sep. 30, 2025 apartment	Sep. 29, 2025 USD ($)	Jun. 30, 2025 apartment	Dec. 31, 2024 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Dividends and distributions paid (in dollars per share) \| $ / shares						$ 0.00		$ 0.45
Gain on dispositions of real estate				$ 0		$ 0	$ 241,400	$ 3,282
Distributions to common unitholders							(198,003)	$ (69,325)
Special Cash Distribution
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Dividends and distributions paid (in dollars per share) \| $ / shares		$ 1.31
Distribution made to limited partner, cash distributions paid	$ 1,200,000		$ 892,000
Special Distribution
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Dividends and distributions paid (in dollars per share) \| $ / shares	$ 7.70		$ 5.80
Fixed Rate Property Debt \| Secured Debt
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Long-term debt, gross				1,747,022			1,747,022							$ 2,144,797
San Francisco, California and Minneapolis, Minnesota
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from real estate and real estate joint ventures				283,300
Boston, Massachusetts, Denver, Colorado, and San Diego, California
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from real estate and real estate joint ventures					$ 155,800
Contribution to unconsolidated joint ventures					$ 91,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Wholly And Partially Owned Consolidated Properties
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Apartment communities owned by VIEs										2	5
Gain on dispositions of real estate				241,400
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Wholly And Partially Owned Consolidated Properties \| Secured Debt
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Apartment communities owned by VIEs \| apartment											5
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Wholly And Partially Owned Consolidated Properties \| Fixed Rate Property Debt \| Secured Debt
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Long-term debt, gross				$ 107,300			$ 107,300					$ 199,900
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Wholly And Partially Owned Consolidated Properties \| San Francisco, California and Minneapolis, Minnesota
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Apartment communities owned by VIEs \| apartment													11
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Wholly And Partially Owned Consolidated Properties \| Boston, Massachusetts, Denver, Colorado, and San Diego, California
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Apartment communities owned by VIEs \| apartment					3
Common OP Units redeemed (in shares) \| shares					2,521,132
Dividends and distributions paid (in dollars per share) \| $ / shares					$ 25.62
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Wholly And Partially Owned Consolidated Properties \| Ardmore, Pennsylvania and North Andover, Massachusetts \| Subsequent Event
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Apartment communities owned by VIEs \| apartment									2