TSP was no stranger to Watertown when it opened an official office in 2017. TSP’s long history of partnering with Watertown clients stretches to the mid-1950s and the firm’s work on religious and education projects. TSP-designed local buildings include Holy Name and Immaculate Conception Catholic churches, Prairie Lakes Cancer Center, the Watertown Event Center, and the South Dakota National Guard’s Brig. Gen. Ernie Edwards Readiness Center.