The Plunge is a 76-year-old historic natatorium that provides programs ranging from lap swim and aqua aerobics to recreational swimming and lessons. Siegel & Strain was hired to conduct a building assessment and update a 15-year-old Historic Structure Report. We also developed schemes for the rehabilitation of the building that explored options for adding new program space to the existing facilities. The final report included an updated Historic Structure Report, a building evaluation, and three schematic design options with cost estimates.