Home » Services » Litigation Services » Expert Witness Testimony Value Our Opinion Litigation Services Expert Witness Testimony gsi staff have provided expert witness testimony for a variety of real estate matters resulting in litigation.Several members of staff have been “qualified” as expert witnesses in front of the following tribunals and courts:Ontario Land TribunalAssessment Review BoardBoard of NegotiationSuperior Court of Justice (Ontario)gsi‘s combined expertise in real estate appraisal and land use planning gives the firm a competitive advantage when provide expert witness testimony. LITIGATION SERVICES Expropriation (Injurious Affection) Retrospective Claims Appraisal Review or Reply Reports Forensic Review Expert Witness Testimony Expropriation (Injurious Affection) Retrospective Claims Appraisal Review or Reply Reports Forensic Review Expert Witness Testimony