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This deal on upscale Mercer Island marks Seattle's biggest apartment sale of the year

Multifamily giant UDR trades Island Square for $157 million
UDR sold Island Square on Mercer Island for $668,000 per unit. (CoStar)
UDR sold Island Square on Mercer Island for $668,000 per unit. (CoStar)
CoStar News
August 5, 2026 | 6:38 P.M.

A transit-oriented multifamily development on Seattle's Mercer Island sold for the highest price paid for apartments in the Puget Sound region this year.

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