D.C.-area home prices on the whole were up in August, bucking the national trend. But some Maryland and Virginia homes appeared to be really priced to move in the third quarter of this year, according to data provided by ZipRealty. Three ZIP Codes in D.C. proper appeared on the discount brokerage’s “cool” list (20032, 20037 and 20024), which is for areas where homes are selling below list price on average.