To expand its cooling capacity by 10,000 tons, the University of Pennsylvania sought to increase its existing chilled water plant with a new 35,000 SF expansion. The project added freight elevator to access all levels of the new and existing plant as well as accommodations for future expansion. The project had numerous constraints which required creative design solutions including existing underground utilities beneath the proposed expansion footprint, the necessity for the existing plant to remain operational during construction, a site bounded by an existing screenwall and a location for the new stormwater management basin on the tight project site. The structure included a steel frame with a combination moment-frame and cross-bracing lateral system with design considerations including lateral isolation of the building addition from the existing structure, deep foundation pile designs and support for the chilled water piping within and above the building structure. The civil engineering design included review of temporary and new trucking routes through the building, site permitting, and a stormwater management system designed for sustainability credits as well as meeting Philadelphia Water Department’s requirements. The Modular VII Chiller Plant is also known for its nighttime visibility from the Schuylkill expressway and surrounding community highlighted by interior and exterior lighting features.