INTERBOARDING WITH CORNERSTONE

Cornerstone Association of REALTORS® (Cornerstone) happily accepts interboard listings within its market areas at no charge! These areas include Mississauga, Burlington, Hamilton, Waterloo Region (Kitchener-Waterloo-Cambridge), Niagara North, Haldimand County, and most of Norfolk County.  
Interboard listings are accepted from REALTORS® who belong to other Ontario real estate boards. These listings will be placed on the MLS® System of the Cornerstone, which means your listing will be available to all 9,000 members and subscribers of Cornerstone PLUS members of ITSO’s participating boards.

For submitting interboard listings: 
  • Information must be emailed to [email protected]  
  • Listings will be processed during regular business hours. 
  • Please include any contact information you wish to be displayed on the listing.  
  • Changes to your listing must be reported to Cornerstone MLS® Staff following the change on your home board listing. We will require a printout showing the completed change on your Home board.  
  • Your listing must meet both the requirements of your home board and Cornerstone. Listings submitted within Cornerstone’s jurisdiction will be processed at no charge (See Map) 
  • Listings outside of Cornerstone’s jurisdiction will be processed for $80 + HST = $90.40.  Payment must be received before the listing is entered into the Cornerstone MLS® System. 
The Cornerstone Association of REALTORS® will activate the listing and email you a copy. If required, an invoice will be emailed to you for payment. 
  • If there are any changes to your listing (i.e., price, status, updates, or corrections), you must provide an updated printout to [email protected]   
  • Interboard listings are not subject to the activation and use of integrated web-based showing services, such as BrokerBay and ShowingTime. 
  • Interboard listings will not be included in Cornerstone’s upload to REALTOR®.ca as your Home Board will upload it. 
  • Listing information submitted to the Cornerstone MLS® System will be retained and used by Cornerstone, its members, and authorized users. 
Please provide the required following documentation: 
  • Complete all mandatory fields by completing the appropriate Cornerstone Property Information form (Available in WEBforms®). Imperial room sizes are required. The form must be typed. Listings will not be accepted if handwritten.  The Sellers do not need to sign. The information on the Cornerstone Property Information form must match the source data concerning the Price, Listing type, expiry, and status.
  • ***IMPORTANT***
    Please note effective September 17, 2024, all Cornerstone interboard listings must be submitted on the ITSO Property Information Forms. As Cornerstone will transition to the ITSO Matrix™️ MLS® System, the legacy RAHB data forms will be retired as of that date. 
  • Seller’s Direction Form, if applicable. 
  • Full print-out of the active listing as it appears on your Home board. 
  • Photo/image of the property (see format and delivery information below). 
  • Listings must include at least one photo or image of the property to be processed. 
  • Submit photos at the same time as the listing, naming them by the property address and numbering them in the desired display order. 
  • Photos must be attached as JPEG files 
  • Embedded photos in emails will not be accepted. 
  • Photos can either be attached or sent via a secure iCloud Link or DropBox-type link 
  • Up to 50 photos may be submitted for each listing. High-resolution images of not less than 1024 x 768 pixels will be accepted. Photos exceeding 20 Megabytes will not be loaded. 

If you have any questions, please contact us at [email protected] or 905.529.8101