Planning to sell the house is not a valid reason to serve the tenants a notice to leave. You can only serve them a notice of termination if there are 3 or fewer rental units in the property once you have signed an Agreement of Purchase and Sale, and the purchaser plans to move in to the house. At that point you would serve the tenants with a Form N12 giving them 60 days to vacate. The notice must terminate on the last day of the rental period or term.

As of July 21, 2020 the landlord is required to give the tenant one month’s rent as compensation, or offer the tenant another acceptable unit if pursuing the N12 notice on behalf of the purchaser. The compensation must be given before the termination date on the notice.