Developing Boston’s Tallest Passive House with Brad Mahoney

As we continue our discussions around high-performance buildings, we would be remiss if we did not discuss the laudable endeavor that is MP Boston’s Winthrop Square. Projected to be the fourth tallest building in Boston and the largest Passive House office space in the world, Winthrop Square is a pinnacle of high-performance design.

Although construction for this project has just begun, we were eager to hear about the plans for this immense undertaking. So, we sat down with MP Boston’s Director of Sustainable Development, Brad Mahoney. Brad shares some of the extraordinary energy conservation measures that will be included in the tower and highlights the many benefits that the project is anticipated to achieve, including advanced productivity, wellness, and social engagement.

Episode Guest: Brad Mahoney

Brad Mahoney Head Shot

Brad Mahoney is responsible for all aspects of MP Boston’s commercial development, including design, construction, leasing and tenant coordination. In addition, he is also the sustainability and technology lead on MP Boston’s next Boston project, an iconic 1.5 million square foot project in Winthrop Square.

Brad joined MP Boston in 2012 and oversaw the restoration of the historic Burnham Building, the former Filene’s Building, in Downtown Crossing. He was also on the development team for Millennium Tower, which is Boston’s tallest residential building. Prior to joining MP Boston’s team, Brad worked at Lend Lease as a construction manager where he oversaw a wide variety of projects ranging from large scale residential to historic restorations. He also managed an expansion for a life science client by using an integrated and virtual MEP design assist platform.


Information & Resources

About Winthrop Square:

About Passive House:


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The 2019 North American Passive House Network (NAPHN) Conference is gearing up to be the biggest and best yet! Join us on June 27-28 at the Metropolitan Pavilion in New York City for a fantastic lineup of sessions that showcase the design and implementation of high-performance Passive House buildings around the globe.

Enter promo code: naphn19*swa to save 10% off your NAPHN 2-day pass! 

Click here to see SWA’s speaking schedule at NAPHN19

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NAPHN’s Certified Passive House Designer or Consultant training

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Buildings and Beyond is a production of Steven Winter Associates. We provide energy, green building, and accessibility consulting services to improve the built environment. For more information, visit


Robb Aldrich | Kelly Westby

Production Team

Heather Breslin | Alex Mirabile | Dylan Martello

Next up on Buildings and Beyond…

Carbon Policy with Laurie Kerr

Guest: Laurie Kerr

Laurie Kerr head shot