Condos are often converted into rental units by owners. This chart provides a comparison of condo unit $/Apt, building ages, number of bedrooms, all units have 1 bath. An interesting note: Studio condos show an average age of 51 years. While One Bedroom condos average 49 years age. Compared to the typical apartment building of 68 years of age...many renters will pay more for a newer condo unit.