844 Don Mills Road, was designed by Clare G. MacLean, and the building was originally known as the IBM Head Office and Factory and was first complete in 1951 and then gained its southern extension and second entrance in 1954. MacLean also designed a HQ building on King St E for IBM in 1962.  In 1994-5, Celestica, a subsidiary of IBM, moved to the property.

The building was included in North York's Modernist Architecture, published in 1997 and listed on the City of Toronto's Heritage Inventory in 2006.  
In 2016 a City of Toronto Heritage Planning Staff report from the Chief Planner and Executive Director of the City Planning Division recommended the property's designation (see sources).  The Toronto Preservation Board considered the report and supported the recommendation on 28 September 2016. The North York Community Council referred the report back to the Chief Planner at its meeting on 13 October 2016, "to allow any recommendations with respect to the cultural heritage to be made in tandem with recommendations on the comprehensive development framework and the final report on the planning application to the lands." (see sources)
By November 2022, the IBM Head Office and Factory had been demolished.

For further information on the history of the property and the architecture, see the attached sources. 

• Architect - David Sheppard and Powell  <-- More buildings by this architect.