input: [Pros] Location: There is often a high concentration of condominiums in downtown locations where land is at a premium. If you want to be in the heart of the city, a condominium may be a good choice. [Cons] 
output: “Box of air”: When you buy a condo, you do not own the land beneath the building, you simply share an interest in it. Instead, you own the space between the walls of your unit, and share ownership of the common areas with other owners.