Cambridge, MA

Twenty|20 at 20 Child Street


Leading the development at East Cambridge’s NorthPoint site, Twenty|20 brings 355 apartment units to the growing neighborhood. The building also offers 8,600 sq ft of retail space and numerous amenities, including patios, an event room, a fitness center with a yoga terrace, an indoor basketball half-court, a courtyard lounge, landscape plaza areas, and underground parking. The nearly full-story glazing maximizes the great city views. SGH consulted on the building enclosure design.

SGH consulted on the design of the building enclosure, including below- and above-grade waterproofing, roofing, opaque cladding, and glazed systems. Highlights of our work included the following:

  • Reviewed the building enclosure design, featuring a sloped terrace with a hardscaped and vegetated stairway, long flanged strip-windows fabricated from curtain wall and corrugated metal panels, a green roof, a courtyard with private terraces and fire pit, and a roof deck
  • Recommended ways to improve performance and developed details to integrate the various building enclosure systems
  • Observed construction of a two-story wall mockup and recommended ways to improve construction sequencing, material compatibility, and constructability
  • Provided construction administration services, including reviewing contractor submittals and visiting the site to observe ongoing construction to compare with design intent
  • Oversaw an extensive quality control water testing program and helped the contractor resolve field issues

Project Summary



Completion Date
New Construction
Building Enclosures
Commercial | Residential | Mixed-Use
CBT Architects
Specialized Capabilities
Facades & Glazing | Roofing & Waterproofing

Key team members

Joshua Kivela
Joshua Kivela
Michael Louis
Michael Louis
Senior Principal