This X12 Transaction Set contains the format and establishes the data contents of the Mortgage or Property Record Change Notification Transaction Set (266) for use within the context of an Electronic Data Interchange (EDI) environment. This transaction set can be used by financial institutions such as Mortgagees, Lienholders, and Lessors to inform interested parties such as Insurers, Investors, and Taxing Authorities of mortgage or property record changes. This transaction set is intended to be used by financial institutions to communicate change notifications, such as the sale of mortgages, assumptions, transfers, and terminations of interest.