Belltown 36

Project Size: 415,000 square feet

Architect: Perkins Eastman, Seattle, Washington

Developer: Security Properties, Seattle, Washington

Contractor: Exxel Pacific, Bellingham, Washington

Belltown 36 is a 29-story mixed-use tower offering 415,000 square feet in the heart of downtown Seattle. There are approximately 200 residential units, 18,200 square feet of office space and 8,500 square feet of retail over four subterranean levels of 243 parking spaces. This unique project features a 300-foot tall art wall extending up the side of the building; and the project sits on top of the SR-99 tunnel.

The structure consists of cast-in-place concrete with post-tensioned floor slabs. CKC used a performance-based seismic design approach to the lateral system, due to its height exceeding the code-prescribed limit for a special reinforced concrete shear wall lateral force-resisting. Through coordination with the project peer reviewer, CKC specified state-of-the-art steel fiber-reinforced concrete coupling beams throughout the building. Building upon recent testing, these coupling beams will reduce material cost, ease reinforcement congestion, and facilitate an increased speed of construction when compared to conventional or diagonally reinforce coupling beams all while maintaining high ductility and rotational capacity.