A CONDO is a type of apartment that is typically owned by one person or family and is usually part of a larger complex. A walkup is an apartment building that does not have an elevator, so tenants must walk up the stairs to reach their unit. A DUPLEX is a type of apartment that consists of two units that are connected to each other, usually with a shared wall. A condominium is a type of apartment that is owned by an individual or family, but is part of a larger complex that is managed by a homeowners' association.