Exhibit 22.1

List of guarantor subsidiaries

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Guarantor Subsidiary

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United Dominion Realty, L.P., a Delaware limited partnership, of which UDR, Inc. (“UDR”) is the parent company and sole general partner, has guaranteed each of the senior unsecured debt securities issued by UDR listed below.

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Guaranteed Securities

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2.95% Medium-Term Notes due September 2026

3.50% Medium-Term Notes due July 2027

3.50% Medium-Term Notes due January 2028

4.40% Medium-Term Notes due January 2029

3.20% Medium-Term Notes due January 2030

3.00% Medium-Term Notes due August 2031

2.10% Medium-Term Notes due August 2032

1.90% Medium-Term Notes due March 2033

2.10% Medium-Term Notes due June 2033

5.125% Medium-Term Notes due September 2034

3.10% Medium-Term Notes due November 2034