The last remnants of the "suburban" Kilgour Estate near Bayview Avenue between Lawrence and Eglinton avenues are a stone gate and accompanying gatehouse at the entrance to Lyndhurst Rehabilitation Centre in the southwest corner of Sunnybrook Park.

The entire park and the neighbouring hospital grounds once belonged to the Kilgour family, who owned a paper manufacturing company and were pioneers of the flat-bottomed paper bag. They purchased 200 acres of land in 1909 and built an extensive farm. The estate often hosted large hound-and-horse fox hunts reminiscent of those originating at aristocratic country homes in England.

Until recently, the Kilgours' unique wooden barn with its twin integrated silos, which at one time served as stables for the Toronto Police Service's horses, had been preserved. Most unfortunately, the barn was entirely destroyed by a fire in 2018. The surviving gatehouse was designed to match the estate's main residence, York Lodge, a mansion-sized take on the English Cottage style.

After Joseph Kilgour died in 1925, his widow, Alice, granted a large portion of the grounds to Toronto for the creation of Sunnybrook Park. Twenty years later, the City repurposed part of the park for the construction of a veterans hospital, which has since expanded and transformed into Sunnybrook Hospital, the largest trauma centre in Canada.