Leaving Greenwood Lake, NY 17A climbs once again to cross another ridge before descending and expanding to a four-lane with median strip to pass through Sterling Forest and reach its eastern terminus at NY 17 in Southfields. The highway formerly continued as County Route 106 (CR 106) in Orange and Rockland counties east to that route's eastern terminus at U.S. Route 9W (US 9W) and US 202 in Stony Point. CR 106 was once part of NY 210 before it was truncated to NY 17A in Greenwood Lake.