Elm Brook Homes is a suburban infill residential project located on a 12.9-acre site in historic Concord, Massachusetts. The development's 12 single-family detached houses are situated on a cul-de-sac atop a raised meadow adjacent to marshland. While the land had previously been rezoned for affordable housing, the developer also obtained a zoning amendment designating the site as a planned residential development (PRD), which allowed increased density and flexibility on setbacks. All units are modular homes whose factory-built components were installed on-site, a construction technique that kept costs low and kept the homes affordable to households at 80 to 140 percent of AMI. Deed restrictions ensure the homes will remain affordable to future buyers at the same income.