The Occupancy % (v4) calcultor computes the percent occupied using the number of units in a building that have been rented out as compared to the total number of units in the building minus the rooms that are on change rooms (OCR). In real estate, the number of units in a building that have been rented out as compared to the total number of units in the building.
Resource:
Dopson, Lea R., and David K. Hayes. Managerial Accounting for the Hospitality Industry. Hoboken, NJ: Wiley, 2009. Print.