Sheboygan-based Abacus Architects has moved its headquarters to a building that formerly housed the Lakeshore College (formerly known as Lakeshore Technical College) Sheboygan campus at 1320 Niagara Ave. The architecture firm’s headquarters office was previously located in a three-story, 2,600-square-foot historic building at 1135 Michigan Ave. in Sheboygan. Lakeshore College moved its Sheboygan campus last