Leaders from all levels of government joined with residents of the MaryEllen McCormack public housing complex to celebrate the start of Winn Companies’ long-awaited effort to redevelop the historic community, breaking ground on the first phase of construction for the 3,300-unit mixed-income and mixed-use project. The project features the first-ever underground geothermal heating and cooling system installed by Winn Companies and the Boston Housing Authority. The 112,000-square-foot structure will provide 94 modern apartments for low-income families currently living in the Mary Ellen McCormack community when it is ready for occupancy in the fall of 2026.