If the property is in the City of Toronto, please review the Toronto Municipal Code https://www.toronto.ca/legdocs/municode/1184_629.pdf . Section 629-25 Occupancy Standards outlines how many people are allowed to live in the rental unit. You can also dial 311 – for the City Staff, who can put you through to Municipal Licensing and Standards staff to better answer your question. If the property is in another municipality, you should call that municipal government telephone number for clarification.