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t: 416 869 5462
f: 416 640 3209
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Suite 2100, Scotia Plaza
40 King Street West
Toronto, ON  M5H 3C2

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Year of Call

Ontario, 2012


J.D., Western University, 2011

B.A. Criminology (First Class Honours), Simon Fraser University, 2005

Mark St. Cyr

Mark St. Cyr is a member of our Construction Law Group. As a construction project expert, his practice focuses on providing strategic and practical advice to clients at any stage of a construction project, including where it becomes necessary to engage the dispute resolution process or litigate. 

From the initial concept and procurement stages, all the way through construction to project completion, Mark advises clients on how to navigate and re-distribute the risks associated with construction. Mark has broad drafting, negotiating, and risk re-allocation experience, having drafted and negotiated construction, master services, engineering, architecture, and consultant agreements for a wide variety of projects throughout Ontario, the rest of Canada, and several other parts of the world.

In addition to providing advice over the life of his clients’ projects, Mark also maintains a construction litigation practice where he represents clients in construction lien actions, bidding and tendering disputes, bond actions, as well as breach of trust, delay, and deficiency claims. 

Mark acts for clients at all levels of the “construction pyramid,” counting owners (from a wide variety of sectors including academia, financial institutions, municipalities, TSX listed mining companies, etc.), contractors, subcontractors, suppliers and engineers, among his recent clients. 

Since law school, during which Mark worked part-time with the in-house legal team of a nationally recognized general contractor, Mark has been practicing construction law. After obtaining his law degree from the University of Western Ontario, and prior to joining Cassels Brock in 2014, Mark gained valuable experience and built his practice as an associate in the construction group of another leading Canadian law firm. 

Prior to becoming a lawyer, Mark was a crime analyst with the Royal Canadian Mounted Police, based in North Vancouver, British Columbia.

  • Canadian Bar Association
  • Ontario Bar Association
  • Toronto Construction Association (TCA)
  • Young Construction Executives Club (YCEC)
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