When I was a kid, my grandparent’s bought a huge old boarding house in Jersey City. It had once housed the actresses working for a big silent film studio across the street, but the film studio was long gone, and the boarding house was unused. My grandparents converted it into a 3-family home. They moved into the bottom floor, offered my parents the second floor, and rented out the third. It worked out pretty good for everyone. Extra income for my grandparents, privacy for our family with quick access to Grandma when it was wanted or needed, and the couple on the third floor were quiet. Very quiet.