% built up Fannie says "built up means sites available and improved. I think: In a mature neighborhood where some sites are vacant and some have "scrapers" and some are habitable, those sites that are improved with scrapers and available for redevelopment should rightfully be included in the not built up %. Fannie wants to know HI/Lo/Mode for prices of SFR. Eliminate extremes. I think: The range should only include those transations that are intended for relatively quick single family occupancy. Those transaction that are intended as hold for development or extensive rehab are not reflective of the SFR market.