The Walter E. Washington Convention Center in Washington, D.C., is the same size as it ever was, but has a lot more space. It only sounds like it violates the laws of physics. Actually, the new space is the result of a recently completed retrofit project that has transformed unused and underused areas around the building into 48,000 square feet of additional meeting space. During a tour this afternoon, Washington Convention and Sports Authority President and CEO Greg O’Dell, along with Vice President of Facility Operations John Collins and Vice President of Communications and Marketing Chinyere Hubbard, took me through the results — on what happened to be move-out day for the high-profile AIPAC Policy Conference 2010, one of the first events to take advantage of the convention center’s enhancements.