The northwestern corner of the park marks the New York City limit and Broadway enters Westchester County in Yonkers, where it is now known as South Broadway. It trends ever westward, closer to the Hudson River, remaining a busy urban commercial street. In downtown Yonkers, it drops close to the river, becomes North Broadway and 9A leaves via Ashburton Avenue. Broadway climbs to the nearby ridgetop runs parallel to the river and the railroad, a few blocks east of both as it passes St. John's Riverside Hospital. The neighborhoods become more residential and the road gently undulates along the ridgetop. In Yonkers, Broadway passes the historic Philipse Manor house, which dates back to colonial times.