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Dorothy Marshall

Managing Director

Property Tax


Dorothy leads a high-performing team of property tax professionals based in DMA’s Toronto office while personally engaging in the intricate details of property tax management. She performs detailed reviews and assessment analyses of complex real property values and property tax classifications for DMA’s clients across Eastern Canada. Dorothy conducts inspections and valuation analyses, and prepares pleadings and expert reports. In addition, she provides expert testimony to assist administrative tribunals, notably the Assessment Review Board, during hearings.



17 years in property tax; 17 years with DMA


  • Leverages analytical, negotiation, and organizational strengths to maximize results for DMA’s clients across Eastern Canada
  • Possesses comprehensive commercial real estate valuation knowledge across all use types
  • Has extensive experience navigating assessment and tax proceedings before tribunals and courts, providing clients with robust evidence and strategic insights
  • Specializes in valuing industrial and special-purpose properties in Ontario, ensuring our clients receive tailored, expert solutions
  • Possesses in-depth knowledge of municipal tax policy, assessment policy and legislation, valuation theory, and assessment procedures

Manitoba | New Brunswick | Newfoundland and Labrador | Nova Scotia | Ontario | Prince Edward Island | Quebec



Automotive | Commercial Real Estate | Data Centers | Distribution | Energy & Utilities | Manufacturing | Mining | Pharmaceutical | Retail | Transportation



  • AIMA designation, Institute of Municipal Assessors (IMA)
  • Member, Canadian Property Tax Association (CPTA)
  • Member, International Association of Assessing Officers (IAAO)
  • Educated in architectural blueprint reading
  • Regularly attends industry workshops through IMA, CPTA, and IAAO
  • Currently working toward Certified Assessment Evaluator (CAE) designation with the IAAO
  • Licensed paralegal with the Law Society of Upper Canada