Brad Mahoney, Director of Sustainable Development at Millennium Partners, presents on their ground-breaking Winthrop Center project, currently the largest Passive House office building in the world, and the tallest building in Boston's downtown core.

RDH Building Science’s David Stanton (Senior Engineer) and John Mann (CPHC, Phius Verifier, HERS Rater) present the essentials of airtightness testing—what it is, why it matters, and how to succeed. This event took place on November 18, 2025. It was made possible by generous support from the Sponsors of Mass Save.

Beth Campbell is an experienced Passive House builder and educator, and has spent the last six months interviewing 40 practitioners involved with more than 20 certified Passive House multifamily projects in Massachusetts. In this event, she shares the most critical lessons learned and identify professional educational gaps, as well as the educational strategies PHMass will be using to help teams succeed.

The Bunker Hill Housing Redevelopment in Boston stands as a pioneering example of large-scale passive house implementation, aiming to deliver 2,699 mixed-rate housing units across 15 buildings. This panel discussion and presentation spotlights the all-star Bunker Hill team, including Nick Nigro (Leggat McCall Properties), Ray Kettner (Stantec), Andrew Steingiser (RDH Building Science), and Gregg Walsh (Suffolk Construction).

The Bunker Hill Housing Redevelopment in Boston stands as a pioneering example of large-scale passive house implementation, aiming to deliver 2,699 mixed-rate housing units across 15 buildings. This panel discussion and presentation spotlights the all-star Bunker Hill team, including Nick Nigro (Leggat McCall Properties), Ray Kettner (Stantec), Andrew Steingiser (RDH Building Science), and Gregg Walsh (Suffolk Construction).