One Manhattan Square

Located along the East River waterfront, One Manhattan Square is an 80-story, 823-foot luxury glass tower with 815 condominiums and over 100,000 SF of indoor and outdoor amenities. Langan performed Phase I and Phase II environmental assessments and investigations, completed a geophysical investigation, provided environmental oversight during soil excavation, performed a subsurface investigation, and assisted with foundation design. Challenges arose during the design due to the presence of adjacent NYC and NYS Department of Transportation bridge structures, as well as significant uplift and lateral loads on the building foundation. In response, Langan helped obtain approval for an early index pile installation and load-testing program, and performed structure monitoring and special inspections during construction.