A discrete identifiable possession, such as a piece of real-estate, to which its owner has legal title. For the Home Information Pack legislation the types of property are restricted to residential properties. It should be observed that "a property is a property is a property" and all real-estate properties, whether residential or commercial or whether being sold for the first or the nth time will have a very similar conceptual structure and similar rules and constraints. As such the broad description of a Property can be regarded as a framework, containing a set of extension points, that can be expanded as necessary to cover additional detail. Address for the property. Unique Property Reference Number A site reference A plot reference An address is composed of a number of structured elements such as Postcode, Post-Town, Street etc. The Postcode for the Address Unique Property Reference Number