Cornerstone is a not-for-profit organization with over 325 years of collective service from its founding associations. Established on July 1, 2024, Cornerstone leads with purpose, advocates boldly, and creates positive change for the success of our members throughout Mississauga, Burlington, Hamilton, Waterloo Region, Niagara North, Haldimand County, Norfolk County, and surrounding areas. With approximately 8,000 members, Cornerstone is the second-largest REALTOR® association in Ontario.