替你google 了下。google: different between condo and townhouse http://www.sdhomedatabase.com/home/2011/01/whats-the-difference A condominium, condo for short, is a single unit that is usually attached to other units within a larger complex. Condo owners only own the inside of an individual unit. Collectively, all unit owners within a development own all the structures and land outside of the individual units. Condos usually share common walls with the units above, below, and to either side, and all owners share the costs of maintaining the structures and land external to the units. You might be interested to know that many buildings that look like apartment complexes are actually individually-owned condos.