Leesburg Concrete is Staffing Up to Support SlenderWall® Building System … – ThomasNet Industrial News Room (press release) Posted on July 9, 2010 by admin - Architectural Metal Leesburg Concrete is Staffing Up to Support SlenderWall® Building System … More: Architectural Metal – Leesburg Concrete is Staffing Up to Support SlenderWall® Building System … – ThomasNet Industrial News Room (press release)