North of an abandoned railroad grade, NY 277 and Union Road become a four-lane residential boulevard through Maryvale, crossing a junction with Genesee Street and soon into an interchange with NY 33 (the Kensington Expressway). North of the Kensington, NY 277 remains a four-lane boulevard through U-Crest and Maryvale, passing numerous residences on its way north into the town of Amherst. After crossing a junction with Wehrle Drive (CR 290), NY 277, known now as South Union Road, crosses under the New York State Thruway (I-90) just east of exit 50 and west of the Williamsville toll barrier, now in the village of Williamsville.