Annual sales in King County, 1990 to 2009. Click here for a larger version Sales of commercial real estate in King County have fallen dramatically since the peak of the market in 2007. GVA Kidder Mathews expects only about $1 billion in sales for this year in the county, the lowest level in 20 years. The Seattle-based commercial real estate services firm says this compares with $8 billion in sales for 2007. Blair Howe, a GVA consultant, said the drop reflects falling prices and the difficulty investors are having getting financing.