 By 1935, NY 270 was realigned to bypass North Forest and Stahl Roads by way of a new section of Millersport Highway. In the early 1940s, NY 270 was extended north over Junction Road to meet US 104 at Warrens Corners. Around the same time, NY 263 was extended southwest to Buffalo over NY 270. Initially, NY 263 overlapped with NY 270 along Millersport Highway; however, the overlap was eliminated in the late 1940s after NY 270 was truncated to begin at NY 263 in Getzville. Similarly, NY 270 initially overlapped with NY 93 along Junction Road from Lower Mountain Road to US 104. At Lower Mountain Road, NY 93 left NY 270 and proceeded east toward Lockport on Lower Mountain and Gothic Hill Roads. NY 270 was truncated to the southern end of the overlap c. 1963.
