He suffered multiple gunshot wounds and is in serious condition.
Gunfire broke out inside a second floor apartment of a Toronto Community Housing high rise at 220 Oak St. sometime around 7 a.m.
Emergency crews converged on the area at Gerrard and River streets.
Police say they are looking for a suspect, but so far no arrests have been made. Officers could be seen Wednesday on a second floor balcony, and dogs were used to check the area.