South Lamar Duplexes - 2010 Market Stats In 2010, 15 duplexes sold in South Austin's South Lamar neighborhood for an average price of $256,353 and an average price per square foot of $120.54. South Lamar duplexes ranged in size from 960-2,384 sq ft and ranged in price from $100,000-$302,000. It ... » Learn More about South Lamar Duplexes