Thornton Heights Commons

Thornton Heights Commons at 611 Main Street introduces affordable housing and street-front commercial space. Built on the former St. John’s Church site, this new four-story mixed-use structure includes 42 apartments, retail space, a satellite police station, community open space, outdoor seating, and parking.

Collaborating with the South Portland Housing Development Corporation, CHA contributed to the design, incorporating architectural bays on upper levels, ground floor commercial space, and indoor/outdoor community areas. Sustainable features encompass a high-efficiency gas boiler system, triple-glazed windows, cross-laminated timber (CLT) components, and a roof-top photovoltaic array for on-site renewable energy. Granite elements from the church are repurposed, highlighting its historical significance. The property allows for additional single-family residential lots.

Thornton Heights Commons breathes new life into this underutilized space, a brownfields clean up success, enhancing South Portland with affordable housing and engaging commercial spaces.

Project summary

47K sf.

This 46,995-square-foot mixed-use development includes 7,500 square feet of retail space.


Totaling 25 one-bedroom, 10 two-bedroom, and 7 three-bedroom affordable apartments.

7K sf.

Featuring a 7,000-square-foot ground-level, Class A retail/restaurant space.

Talk to an expert

Shane Dunn, RA, LEED AP*

Shane Dunn, RA, LEED AP*
Section Manager, Architect

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Shane has more than a decade of architecture experience, with a focus on elegant and environmentally responsive design through the application of artistic principles and proper building science practices. His passion lies in producing exquisite design work while balancing the many facets of the architectural process to deliver quality results and exceed client expectations.