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WALTHAM, MASS. — Callahan Construction Managers has broken ground on Broadstone Watch City, a 244-unit multifamily project that will be located in the western Boston suburb of Waltham. The development will span 348,936 square feet and will consist of 195 market-rate residences and 49 affordable housing units. Amenities will include 293 parking spaces, an outdoor pool and courtyard, resident lounges, a conference room and a fitness center. CUBE 3 Studio is designing the project, which is being developed by a partnership between Alliance Residential Co. and The Carlyle Group. Completion is scheduled for May 2022.