The installation of one of Detroit’s largest blade signs completed the final touches of a $40 million renovation project at a former Cadillac showroom Friday. The historic building, located at 6001 Cass Ave. and designed by legendary Detroit industrial architect Albert Kahn, is now home to Tata Technologies’ North American headquarters and collaborative workspace company WeWork. The renovation is one of many projects spearheaded by development company The Platform. The building is located in the heart of TechTown and is kitty-corner from the Pistons Performance Center.