First, Hill Harper bought a coffee shop in Detroit. Now the “CSI: NY” actor is really digging into his adopted hometown: he’s the new owner of the iconic Charles T. Fisher mansion in Detroit’s Historic Boston-Edison District. On Wednesday, the Junior League of Detroit announced that Hill’s home will be the location of the league’s 2018 Designers’ Show House. Dozens of interior designers will transform the home room-by-room and then open it to the public for tours to raise money for the junior league’s nutrition initiative called Project EAT. Hill, an Iowa native who bought The Roasting Plant downtown earlier this year, said he’s excited to host the show house.