*Amendment 0006 is an administrative modification that corrects the submission due date from 27 August 2025 to 2 September 2025 at 10:00 AM ET. This project is for the design/bid/build construction of a comprehensive replacement of the Heating Ventilation and Air Conditioning (HVAC) system in facility 20824, a two story (with penthouse), 49,000 square feet (SF) research building comprised of both research laboratory and administrative space. Work includes replacement and consolidation of existing AHUs while converting the facility to variable air volume from a patchwork of other system types. The new modular chiller-heater will be capable of delivering 210 tons of cooling and 1,845 MBH of heating.