Our house here in Toronto has been rebuilt to have both a basement rental apartment, and a second floor rental apartment. We live on the main floor. There are 3 full bathrooms, and three full kitchens in our house. My Wife's younger son Mike did the reno over a 2 year period of time. He is a half owner of the house, while my Wife and I own the other half. Eventually he will own it 100 percent, after we die. With no mortgage on the house, the combined monthly rental income covers all of our costs, with some money left over. JimB.