 With D.C.'s office vacancy rate at a record high, construction of new office buildings has ground to a halt, literally. The office building development in the district is at a 20-year low. Only one office project in D.C. is active right now. It's Metro's new headquarters. The Waldorf Astoria in D.C. is headed for a foreclosure auction. The Washington Business Journal says it's set for August 5th.