I have a building that is a three story office multi-tenant building that is condos. It was previously measured by another firm using a modified "BOMA" measurement which it looks like they used the exterior of the perimeter walls to determine the gross measured area of each floor. I have always thought that the gross measured area was to the dominent portion not the exterior. Is this a "modified" BOMA measurement or it this due to being Condos? I am not sure on how to measure the vacant spaces of the remaining buildng to the dominant portion or to the exterior?