680 Folsom Street

San Francisco, CA

Close Up

  • Owner/Developer

    Boston Properties
    TMG Partners

  • Architect

    Skidmore, Owings & Merrill

  • Engineer

    Tipping Mar

  • GC

    Plant Construction Company

  • Completion


  • Building Type


  • LEED Rating

    Platinum certified

  • Program

    15 stories (230ft), 502,000 sqft

  • Façade Area

    190,000 sqft design/build facade package, including a custom unitized curtainwall system, mechanical screen wall, storefront, AESS columns, aluminum fins, shadow box panels, and a cantilevered wing wall

  • Glass

    Typical vision lites measure 72” X 123” (VNE1-63 with a 5/16)




  • Merit Award, AIA – California Council, 2014
  • San Francisco Business Times Renovation Award, San Francisco Business Times, 2014


The aging precast concrete shell at 680 Folsom Street in San Francisco’s South of Market district went through an intense makeover. The renovation evolved around a recladding program that replaced the original 1960’s concrete building shell with 190,000 square feet of facade. The revitalization effort was designed by architect Skidmore, Owings & Merrill to be highly transparent, and consists of a custom unitized curtainwall system, and aluminum fins on three elevations. Typical units span 6’ x 15’. Unique considerations included a cantilevered wing wall that extends three feet from the curtainwall system.

Visual and performance mock-up tests included air infiltration, static/dynamic water tests, structural loading, vertical/horizontal displacement, maintenance platform tieback testing, and inter-story drift testing of façade systems.

Enclos’ installation strategy reused the existing floor slabs to support the new wall systems, with steel plates welded to the edge of floor slabs for curtainwall anchors. Units were set using a monorail system at an expedited rate.

Enclos also provided design/build facade renovation services for 50 Hawthorne, a three story low-rise adjacent to 680 Folsom Street.