193 acres of enormous North Austin ranch scoots onto the market 193 acres of enormous North Austin ranch scoots onto the market It's part of one largest undeveloped parcels of land in Central Texas. Photo by dszc/Getty Images A sizable chunk of Austin’s enormous Robinson Ranch could become the area’s next major site for mixed-use development. Commercial real estate company JLL Capital Markets announced on December 17 that it had been tapped to market a 193-acre development site at State Highway 45 North and North MoPac Expressway. This parcel — with about two-thirds the acreage of the Domain complex — is part of the roughly 7,000-acre Robinson Ranch, one of the largest privately owned chunks of undeveloped land in Central Texas. By comparison, Austin-Bergstrom International Airport covers about 4,200 acres.