Solicitation from the DEPT OF DEFENSE, DEPT OF THE NAVY, and NAVFACSYSCOM WASHINGTON is seeking services for the repair of mechanical systems and building improvements. The project includes the replacement of deteriorating hydronic floor mounted fan coil units, rooftop package units, mini-split type a/c units, ceiling exhaust fans, and a baseboard heater unit. Additionally, new work involves the installation of ceiling cassette type fan coil units, modification of existing fan coil units piping, installation of rooftop package units, mini-split type a/c units, ceiling exhaust fans, baseboard heater unit, ceiling exhaust fan, dedicated outdoor air system (DOAS) unit, acoustical ceiling tiles, and modification of existing electrical panel. The building will remain occupied during construction, with a focus on maintaining heating, cooling, and dehumidification in the Air Traffic control operation room.