I am appraising a small multi-tenant medical office building (4,384 SF Gross Building Area + 782 SF Covered Gallery). The covered gallery extends along the entire front of the building, and also includes a covered area (with a skylight) in front of the entrances to 3 of the 4 suites. The covered gallery has a concrete walkway, columns and a cover (roof) but is not enclosed. It is used by the three tenants and their visitors.
Question - may I include the area of the covered gallery as common area that can be added to the tenants usable area as an add-on/core factor?