There are a shitload of interesting buildings in Hochelaga-Maisonneuve. On top of some really nifty warehouse/factory conversions, there are some real gems.
Théâtre Sans-fil (a puppet theatre company) uses the old Caserne Letourneux. It's really long and narrow, hard to fit in one photo.
Théâtre Denise-Pelletier recently underwent a complete restoration. I haven't been inside since but it is apparently gorgeous.