The United States General Services Administration (GSA) has a requirement for the selection of a quality contractor for the Design Build Air Handler Unit (AHU) / Photovoltaic (PV) Roof / Green Roof project at the Byrne Courthouse and Green Federal Building in Philadelphia, PA. This project is to be awarded as a firm fixed price contract. The work includes but is not limited to the following: design and construction of the replacement of the Air Handler Units (AHU's) with high performance equipment and the installation of a green roof at the Green Federal Building and the installation of a rooftop crystalline photovoltaic system at the Byrne Courthouse in Philadelphia, PA.