MINNEAPOLIS — Wiegmann Associates has begun work on a new six-story, 308-unit multifamily project in the Dinkytown neighborhood of Minneapolis. As the engineer of record and mechanical contractor, Wiegmann is responsible for designing, coordinating and managing the installation of the mechanical systems for the 487,000-square-foot building. The developer is targeting LEED Silver or MN B3 certification, which requires that the HVAC systems meet strict energy-efficiency standards. The B3 guidelines, which can be applied to new buildings or renovations to meet sustainability goals, are required on all projects that receive general obligation bond funding from the State of Minnesota. Completion is slated for this June.