An Ottawa real estate company is teaming up with a Montreal firm on a planned residential highrise and “community hub” with co-working space in the heart of Centretown. Gemstone Corp. recently filed an application at City Hall for the mixed-use development that would feature a 16-storey tower with 140 rental suites and about 2,600 square feet of ground-floor commercial space at the northwest corner of Somerset Street West and O’Connor Street. The property consists of three parcels of land known officially as 311 Somerset St. W. and 234 and 236 O’Connor St. The 0.3-acre site now contains a commercial parking lot, and part of the property was once home to a heritage structure that was heavily damaged by fire before being torn down in 2017.