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t: 416 869 5462
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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., University of Western Ontario, 2011

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

Mark St. Cyr

Mark St. Cyr is an associate in the Construction Law Group where he advises construction industry clients at all stages of their projects; from procurement right through to dispute resolution. 

In addition to reviewing, drafting and re-allocating risk in construction contracts at the outset of a project, Mark provides ongoing advice on issues such as contract interpretation, non-payment, written notices of lien, and options for termination, among others. In the event a dispute arises at any time during a project, Mark also has experience representing clients in construction lien actions, bidding and tendering disputes, bond actions, as well breach of contract, breach of trust, delay, and deficiency claims.

Mark acts for clients at all levels of the “construction pyramid,” having previously acted for owners, contractors, subcontractors, suppliers and engineers, among other large (and small) players in the construction industry both inside and outside of Canada. Recently, Mark has assisted multiple American general contractors with their northern migration by producing “Canadianized” contract packages.

Prior to joining Cassels Brock, Mark gained valuable experience and built his practice as an associate in the construction group of another leading Canadian law firm.

While attending law school at the University of Western Ontario, Mark summered and worked part-time as an in-house law student at one of Canada’s largest general contractors. During this time, he assisted on all legal matters for the corporation including two multi-million dollar delay and deficiency arbitrations.

Prior to attending law school, 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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