Insignia Towers

Bosa Development Corporation
Seattle, Washington

Insignia Towers
Hart Crowser was the geotechnical and environmental consultant for the design and construction monitoring of two 40-story towers in Seattle’s Denny Triangle area. The project required mass excavation for 3 to 4 levels of underground parking over an entire city block bordered by Fifth Avenue, Sixth Avenue, Bell Street, and Battery Street. The solder pile and tieback shoring system was designed and installed to minimize the impact to the adjacent Battery Street Tunnel and Monorail guideway foundations. Hart Crowser provided site-specific seismic design criteria in support of the City of Seattle-mandated seismic design peer review process.