The District of Columbia (the “District”) Department of General Services (the “Department” or “DGS”), is issuing this Invitation for Bids (“IFB” or “Solicitation”) to engage a highly qualified contractor (the “Contractor”) to provide all labor, materials, and equipment to complete a modernization and upgrade to the 9th-floor terrace, including the roof and overburden replacement (including vegetative overburden), storefront/window wall system railing replacement, drainage element replacement, fall protection system inst