Powerhouse Square Building, Construction, Sub-contractors Powerhouse Square Visit Website Request Info 312 Main St. Great Barrington, MA 01230 413-429-6744 About Map About mixed-use development project in the center of downtown Great Barrington which is the new home of The Berkshire Co-Op Market, additional retailers, and 22 new condominiums What's Nearby? Distance: 5 10 15 20 25 50 mi.