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LEXINGTON, MASS. — DiMella Shaffer, a Boston-based architecture and design firm, has completed its second expansion project for the 26-acre Brookhaven at Lexington seniors housing community located north of Boston. The project featured renovations to all common areas, and expansion and improvements to the assisted care and long-term care facility. A four-story wing that houses new amenities has also been added. Brookhaven Senior Living owns the property.