Check owner name before renting an already sold house
So I want to rent this townhouse and I meet today with the owner. He showed me the place and told me he just sold the house and that is why I can rent it only until the closing date on September. That is fine for me, because I am looking just for 5-6 months but , is this legal? can he rent an already sold house? Also, where could I check that he is the real current owner of the house and nobody is going to kick my ass out of the house before September? Do we have on Ontario some kind of real estate public registration service like in Spain? He offer to show me the selling contract, also to sign a legal contract for the lease until September and use nominative cheques.