Horizon House CCRC Begins Construction On $600M West Tower Expansion In Seattle

The 33-story residential tower will house 202 units and is expected to be completed in 2029.
Published: September 1, 2026
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Horizon House, a continuing care retirement community (CCRC) in Seattle, is undergoing a $600 million expansion, according to Seattle Magazine.

The project comprises a new 33-story West Tower housing 202 units, which will replace an existing 50-unit wing. The West Tower is expected to increase the community’s resident population by approximately one-third.

Architecture firm Mithun (Seattle) is providing integrated architecture, interior design and landscape architecture services on the project. Andersen Construction (Seattle) is serving as design-builder and general contractor.

Construction is slated for completion in 2029.

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