Alternative method to express a factor. Sometimes called an Efficiency Factor. It is the inverse of the BOMA R/U Ratio (Rentable divided by the Usable), it is the (Usable Area divided by the Rentable Area) and then the number is subtracted from one. A Loss Factor or Efficiency Factor is not recognized by BOMA as a factor however, is used in some parts of the world to calculate the Rentable Area. Note the a loss factor cannot be used to generate a Rentable area of a building.
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