Bayview Avenue is a major north–south route in the Greater Toronto Area of Ontario. North of Toronto, in York Region, Bayview is designated as York Regional Road 34. History Bayview Avenue follows the first concession line, laid east of Yonge Street. Over time, the concession road became known as East York Avenue, a reference to the division it formed between the city of Toronto and the township of East York. In 1931, James Stanley McLean constructed "Bay View" (now known as McLean House), a house overlooking the Don Valley with a view south down to Toronto Bay, on the edge of Moore Park and ultimately this led to the road becoming known as Bayview Avenue. On August 17, 1959, Bayview was extended south from Moore Avenue in Leaside to Front Street. The northern section of this extension was routed alongside Pottery Road to Nesbitt Drive. South of this, it wraps around a hill and descends into the Lower Don Valley, travelling parallel to the route of the Don Valley Parkway. This addition is frequently referred to as the Bayview Extension. It was constructed as part of the Don Valley Parkway project, and necessitated the removal of "Sugarloaf Hill" directly north of the Bloor Street Viaduct. The extension fulfilled the "central spoke" in the building of the "Don Valley Roadway" as proposed in the 1940s. A route through the ravine to St. Clair Avenue was replaced with the present route which stays within the Don Valley proper. With the creations of the Corktown Common in 2013, the southern end of the Bayview Avenue Extension now terminates at Mill Street. The list of streets removed or used to create the extension included: Don Roadway West – from Front Street to Winchester Street Marriott – from north of Bloor Street beginning at Park Drive (now Park Drive Reservation Trail) In the late 1990s, York Region conducted several road needs studies near Lake Wilcox, which determined that the disjointed and disconnected Bayview Avenue should be connected from Stouffville Road in the south to Bloomington Road in the north. A lengthy battle ensued between environmentalists, upset over continuing construction in the supposedly protected Oak Ridges Moraine. The discovery of Jefferson salamanders in the study area resulted in several modifications to the design of the route, including a structure over a dry ravine, as well as five amphibian tunnels. On November 17, 2002, the new extension