Runway Properties Inc. purchased 1831 18th St. for just over $1 million. The transaction for this 30,000-square-foot industrial building is part of series of related sales of some smaller properties and land adjacent to the site that are being prepared for the development of a neighborhood center called the R Street Market. The initial phase of the R Street Market project is scheduled for August of 2003. Matt Cologna of Grubb & Ellis represented both the buyer and seller.