Determining who can sue for a problem in a multi-family building—a townhome or condominium building—requires determining who owns that portion of the building. Sometimes the building’s homeowner’s association owns that portion and is the only party that can pursue the claims. Sometimes the unit owners own that portion of the building and they are the only party who can pursue claims. Other times one of the two—homeowner’s association or owners—owns the defective portion of the building but both can bring claims. Determining who can sue and what they can sue for is a legal issue that varies from cases to case and requires analysis by a lawyer.