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WASHINGTON, D.C. — Washington, D.C.-based Rock Creek Property Group has purchased a 28,366-square-foot building, located at 1100 16th St. NW in Washington, D.C., at a foreclosure auction from Tysons Corner, Va.-based Cardinal Bank for $4.72 million. The company plans to gut the building and convert the project into a first-class office headquarters. Rock Creek has retained Washington, D.C.-based OTJ Architects as the base-building architect and planner. Construction is slated to begin in the first half of 2012 with completion slated for later in the year.