Home & Design Arlington’s 10 Most Expensive Neighborhoods Buyers pay top dollar for these upscale enclaves just outside the nation's capital. Arlington Magazine Staff By Arlington Magazine Staff April 19, 2019 Share FacebookTwitterPinterestWhatsAppEmailCopy URL #7Â Crystal Spring Knolls Quarter-acre lots are the norm in this established, tree-lined neighborhood, situated just north of Lorcom Lane and close to the Potomac River. Homes sold in 2018: 5- Advertisement - Average sale price: $1,376,300 Our Digital Partners Become a digital partner ...