Leland:
Here in NJ, any 'common area' has to be from a 'common area' (house) panel.
Common area definition is rather lengthy; I'll be brief.
Stairwells, hallways, etc common to all occupants. One heating unit for multiple occupants; a 'shared area (basement, etc)
Here, you could not do what you intend above, you would have to install a house/owner meter and panel.
