v3.25.3

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	Oct. 31, 2025 USD ($) home	Sep. 30, 2025 USD ($) community
Real estate properties
Number of communities \| community		168
Costs Incurred to Date		$ 182,256
UDR's Remaining Commitment		120,344
Loss contingency accrual
Contingency liabilities		0
Real estate technology and sustainability investments
Real estate properties
Costs Incurred to Date		129,507
UDR's Remaining Commitment		$ 39,493
Wholly owned - under development
Real estate properties
Number of communities \| community		1
Costs Incurred to Date		$ 52,749
UDR's Remaining Commitment		$ 80,851
Home operating community located in Woodbridge \| Subsequent Event
Real estate properties
Number of apartment homes agreed to acquire \| home	406
Contract to purchase	$ 147,000
Deposit on purchase	$ 3,000

-- None. No documentation exists for this element. --

+ References

No definition available.

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Namespace Prefix:	udr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of deposit made on purchase commitment.

+ References

No definition available.

+ Details

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Namespace Prefix:	udr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of properties agreed to acquire by the entity under the purchase commitment contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	udr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

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-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

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Data Type:	xbrli:monetaryItemType
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- References

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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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

Reference 1: 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(17))
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
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-Publisher FASB
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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

No definition available.

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- Details

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- Details

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UDR, Inc. 10-Q