Most declarations for residential condominiums restrict the occupation and use of the units to residential use. Some go further and restrict the occupation and use of the units to “single family” or “one family” residences. The typical language used is something like:
Each unit shall be occupied and used only as a residence for a single family and for no other purpose.
These clauses have been contained within declarations since the 1970s, maybe even earlier in other jurisdictions. Most of you probably have similar clauses in your declarations, unless you are a commercial, industrial, or resort condominium, or one designed for student-housing.