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AUSTIN — Transwestern has brokered the sale of 811 Barton Springs to a fund managed by Cornerstone Real Estate Advisers. The 143,183-square-foot, Class A office building is located on Barton Springs Road between Austin’s central business district and the Southwest submarket. The nine-story building was 99 percent leased at the time of sale. The property, which underwent more than $1 million in renovations during the past several years, earned an Energy Star rating in 2009 and LEED-Gold certification in 2013. Hale Umstattd and Leah Gallagher of Transwestern represented the seller.