Centrum Hubbard gets in on the glass action.

A big milestone has been reached in River North this week. The first level of cladding is being installed at Centrum Hubbard, the residential tower going up at 215 West Hubbard Street. The 23-story, 193-unit apartment companion to the 9-story office building next door at 412 North Wells, both designed by Hirsch Associates Architects, is up to the 17th floor.