Greenwich condo and single family housing price indicators showed mixed year-over-year results. Condo median sales price increased 10.5% to $775,000 while single family median sales price declined 18.1% to $1,780,000. The price decline was consistent with the 13.4% drop in average sales size to 3,426 square feet. Price indicators for the luxury market, the top 10% of all sales, outpaced the overall market despite the 10.2% decline in average sales size to 7,924 square feet…