Seattle House

Seattle, WA

BB6 tower rendering
BB6 tower rendering


7 below grade parking levels

cast-in-place concrete

Seattle House

Project Size: 1,250,000 square feet

Architect: IBI Group, Seattle, Washington

Structural Engineer: Cary Kopczynski & Company, Bellevue, Washington

Contractor: JTM Construction, Seattle, Washington

Seattle House is a mixed-use development comprising two 480-foot towers atop a seven-level podium and seven levels of below-grade parking. Located in the heart of the Denny Triangle neighborhood near Amazon’s global headquarters, the project will include residential apartments, extended-stay lodging, office, retail and parking. Residential amenities will include exterior rooftop gardens at the podium, and the top floor of each high-rise will include social gathering areas. 

The structure is cast-in-place concrete with long span two-way post-tensioned slabs. The lateral system consists of efficient eccentric shearwall core with drophead on two sides of the core, which resulted in increased spans and eliminated interior columns. CKC incorporated stepped columns for column transitions, eliminating all transfer beams. Performance-Based Design was used for seismic design.

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