York Mills Centre was developed by York-Trillium Development Group Limited and constructed in four phases (now called "Buildings 1, 2, 3 and 4") from 1985 until final completion in 1992. The site was zoned for office development in the North York Official Plan and the 'top of slope' of the adjacent lands was the height limit for all parts of any development.

The York Mills Centre site is part of historic Hogg's Hollow where the first settler arrived in 1794. It was originally called the York Mills Village due to the development of the area around three mill sites. At the start of the 20th century, the valley began to develop a residential area. Surrounded by tall trees, steep hills and parkland, Hogg's Hollow has become one of Toronto's prime residential areas.

Through the years, York Mills Centre has won the following awards:

» 2006 BOMA Canada TOBY Award - The Office Building of the Year

                                                                  (500,000 - 1 Million Sq. Ft. category)
» 2006 BOMA Toronto TOBY Award - The Office Building of the Year

                                                                  (500,000 - 1 Million Sq. Ft. category)

» 2006 BOMA Toronto Certificate of Excellence

» 2006 BOMA Toronto GO Green Building Certification

» 2001 BOMA International Earth Award Finalist
» 2000 BOMA Canada Earth Award
» 2000 BOMA Toronto Earth Award
» 1999 BOMA Toronto Certificate of Building Excellence
» 1997 City of North York Environmental Award of Excellence