SOLD 11/2021 – 6 Riverside Drive is a 77,026 square foot flex/R&D building occupied by Physical Sciences Inc. (PSI) and Frontline Education. PSI develops and produces intelligence, surveillance, and reconnaissance systems (ISR), laser sensors, and tactical products for the U.S. government and the commercial sector. Frontline Education designs cloud-based educational software for K-12 school districts. Rhino acquired the property in March 2021.