These comments are based on Ontario. Things may be different down south.

Up here, the common elements could be anything from the entire building outside of the drywall, to just the roadway. You need to check the declaration to see where the unit boundaries have been defined.

Of the last three I have done, the common elements for the first was everything outside the drywall, one was the roof only (just sheathing and shingles) and the last one was just the roadway, sidewalks and site lighting (the driveway, deck, yard and the entire building were part of the units).