85 Walnut Street

Our work included studies of potential structural systems and layouts, developing construction documents, and providing construction administration services. SGH served as the structural engineer of record and designed the following structures:

• The composite steel-framed building constructed with two wings
• A mechanical penthouse with 18 ft tall cantilevered screens
• The detached four-level, 370-car precast concrete parking garage with two stair towers, one elevator, and a partially below-grade level

We also consulted on the enclosure design for the building, including below-grade waterproofing, facades primarily comprising curtain wall frames set in large punched openings and surrounded by metal panel cladding, sections of multistory curtain wall, waterproofing for a rooftop terrace, and membrane roofing. Our work included reviewing the proposed design; helping select systems and develop details; and providing engineering support during mockups, performance testing, and construction.