Boston, MA

31 Heath Street


The Possible Zone (TPZ) is a Boston-based nonprofit helping local high school students grow their entrepreneurship, design, and creative skills. Looking to establish a new headquarters, TPZ purchased 31 Heath Street and undertook a project to renovate the interior of the 1890s unreinforced brick masonry building and 1990s steel-framed addition. SGH provided structural engineering services for the rehabilitation.

As the structural engineer of record for the project, SGH designed structural modifications, including:

  • A new steel-framed monumental stair between the basement and Level 2 of the 1890s building, including floor openings in Level 1’s concrete and heavy timber floor framing and in Level 2’s brick jack-arch floor assembly to accommodate the new stair
  • A reconfigured landing and run for an existing stair
  • Strengthening of a third stair to support additional load and accommodate a new door at Level 1
  • Wall anchors to connect the existing unreinforced brick masonry walls to the floors and roof to provide out-of-plane support in accordance with the Massachusetts Building Code
  • Cantilever framing in the existing atrium to support new meeting rooms in the 1990s building
  • Galvanized steel dunnage framing to support new mechanical units on the existing 1990s roof, a screen wall to shield the equipment from the street, and strengthening of existing steel roof framing to support the additional loads
  • Upgrades to the front entry, including new concrete stairs, site walls, and foundations for the new vestibule
  • A concrete loading dock and foundations for deliveries at the back of the building

Project Summary



Completion Date
New Construction
Specialized Capabilities
Repair & Strengthening

Key team members

Paul Kassabian
Paul Kassabian