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

The 33-story project is expected to increase the community’s resident population by approximately one-third.
Published: August 18, 2026

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 the designer on the project, with Andersen Construction (Seattle) serving as design-builder and general contractor.

Construction is slated for completion in 2029.

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