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The gsi team

Professional staff at gsi have combined expertise in appraisal, planning and consulting services.

Ian K. Tilley

Real Estate Appraiser (AACI, P.App.)
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Ian Tilley - Real Estate Appraiser

Mr. Tilley is an accredited real estate appraiser (AACI, P.App.) and Professional Land Economist, having worked in the appraisal field for more than 20 years. His practice focusses on the preparation of appraisal reports for matters related to expropriation and litigation, and he has appeared as an expert witness at the Ontario Land Tribunal and the Superior Court of Justice (Ontario).

Mr. Tilley has performed a wide range of real estate valuation assignments for both the private and public sectors, and has appraised a multitude of property types including: development land, multi-residential, office, industrial, retail, institutional, parking garage, water lot, and hotel.  In addition, he is an expert in the valuation of partial interests such as easements, as well as assignments involving air rights. 

Certifications & Professional Affiliations

Appraisal Institute of Canada – Designated Member AACI

Association of Ontario Land Economists – Designated Member PLE

Ontario Expropriation Association – Director & Past President (2014) 


Bachelor of Arts
University of Western Ontario

Diploma in Urban Land Economics
University of British Columbia

Prior Experience

2004 – 2008
Integris Real Estate Counsellors

2002 – 2004
Kellough Pestl Singh Associates