Winthrop Square, Boston
Location: Boston, MA
Owner: Millennium Partners
Completion Date: December, 2019
General Contractor: Suffolk Construction Company
Vital Statistics: Project Value:$20,000,000.00
Wall Type: 36" and 48" Reinforced Concrete Wall and 63 LBEs
Wall Area: 140,000 S.F.
Max. Excavated Depth: 172'
A 690' tower with five levels of underground was built on this challenging downtown site with high rise buildings abutting the site on three sides. A new perimeter slurry wall was constructed within three feet of the abutter foundations, with strict project vibration and wall movement criteria. The building was constructed using top down methods, involving construction of 63 interior LBEs to support the core walls and interior column loads. Heavily loaded columns required LBE bedrock embedments of up to 100' in highly variable bedrock conditions.