Either is acceptable, so do whatever works best for you. Think of a strip mall like a city block where all the buildings share a wall.
A strip mall is not eligible for an ENERGY STAR score or certification, but an individual property within a strip mall (e.g., store, bank, office, etc.) may be eligible. As long as the property is a type that can get a score, is greater than 5,000 sq ft (1,000 sq ft for a bank) and has an outside entrance to the public, then it is eligible to receive a score and certification.