MEDFORD, MASS. — Charles River Realty Investors has acquired a 116,490-square-foot office building in Medford for an undisclosed price. The transaction was a sale-leaseback with the seller, Citizens Bank. Located at 20 Cabot Road, the property was built in 1987. Citizens Bank, currently occupies 85,200 square feet at the property and has signed a 10-year lease with Charles River Realty for the space. The remaining 31,290 square feet will be leased to new tenants. National Development will serve as the property manager. Charles River plans to make significant improvements to the building, including an updated lobby and common areas, a new fitness center, landscape enhancements and updated signage.