I wonder if anyone out there in AUGI land can help me. I'm trying to careate a formula property that will calculate whether or not a room in a building (residential construction) passes lighting and ventilation code requirements. If I create formula properties under the window object that calculate the Lighting and Ventilation values based on a windows size, can I then create a formula property set under the space object that will calculate whether or not the room passes code? In short can a space object be set to include the properties from a window object that is only in that room space, will it reference the properties from every window, or will this not even work at all. And could it work if i assigned the space object to reference the properties from window objects? Any help would be much appreciated