This is an architectural floor plan for the fourth floor interstitial space of Building 2 (South Building). The plan is not to scale and was last updated on 5/14/25. The drawing shows a detailed layout of the floor with a grid coordinate system marked along the perimeter (numbered 1-20 horizontally and lettered A-J vertically). The plan depicts various spaces including mechanical and electrical systems, with multiple equipment callouts indicated by circled numbers throughout the layout. The central portion of the floor contains concentrated mechanical infrastructure, while the surrounding areas appear to be service or utility spaces. The drawing includes a title block indicating it is a construction document, with spaces for project information, client details, and revision tracking. This appears to be a working architectural document used for building systems planning and coordination rather than a federal contract procurement document.