> TOTAL BUILDING SOLUTIONS INCORPORATED District of Columbia Since: 2007 TOTAL BUILDING SOLUTIONS INCORPORATED
> GLOBAL ENGINEERING SOLUTIONS OF WASHINGTON DC, P.C. District of Columbia Since: 2008 GLOBAL ENGINEERING SOLUTIONS OF WASHINGTON DC, P.C.
> MICHAEL J GIUFFRIDA & ASSOCIATES INC District of Columbia Since: 1981 MICHAEL J GIUFFRIDA & ASSOCIATES INC
