One Yonge Street (previously known as the Toronto Star Building) is a 25-storey office building in Toronto, Ontario, Canada. The building served as the headquarters of Torstar and its flagship newspaper, the Toronto Star, from 1971 to 2022. It is 100 metres (330 feet) tall and built in the International style. It was built as a replacement to the Old Toronto Star Building, which was located at 80 King Street West. That building was torn down to make room for First Canadian Place.
1 Yonge Street is located in Queens Quay, and marks the foot of what was Highway 11, mistakenly believed to be "the longest street in the world".
The building also housed the printing presses for the Toronto Star's print edition until 1992, when a new press centre was opened in Vaughan, Ontario. The finished newspaper content is sent electronically to the plant where the plates are burnt and the paper is printed and distributed. The editorial content of the newspaper was produced by employees working on the fifth floor.The office space at One Yonge Street is leased out to a variety of other companies, including Pinnacle International, the Liquor Control Board of Ontario, Ontario Cannabis Retail Corporation, RL Solutions, Starbucks, Luminus Financial, a dental office, and the downtown Toronto campus of Collège Boréal.Torstar sold the building and its surrounding property to a private holding company in 2000 for $40 million, but the newspaper continued to occupy several floors of the building on a long-term lease. In December 2021, the Toronto Star announced that it would vacate the building and move its offices to The Well, an office complex that hosts other companies, in 2022. The move was completed in November 2022.