Ballantyne Housing Market Update/Video: March 2019. Average and median Ballantyne home sale prices saw an increase in March, at 4.3% and 4.6%, respectively. Despite an increase in days on market, homes are still selling in under two months on average. The months supply of homes at 2 months and an 11.8% drop in new listings keeps the Ballantyne/28277 zip code housing market a seller's market.