Subsidize up to a certain percent on a house based off persons income and value of house, as well as prevent the number of residential properties that can be purchased by a single person or corporation (for traditional homes). With regards to condo's and apartments a person or corporation can own multiple but a limit must be put on how many are allowed to be used for short term rent applications/programs like AirBNB. Abandoned&condemned properties should be purchased by the provincial or federal government and turned into low income housing to help combat homelessness.