This system is a method used to legally describe real property, particularly in platted subdivisions. It identifies individual parcels by reference to a recorded map, which divides a larger tract into smaller, manageable units. Each unit is assigned a number (the lot) and it is part of a larger designated area (the block), within the subdivided area. A typical description using this method would include the lot number, the block number, the name or identifying number of the subdivision, the county, and the state.
Its significance lies in providing a standardized and easily searchable system for property identification and conveyance. This method simplifies property transactions, reduces ambiguity in ownership records, and assists in property tax assessment. Historically, the adoption of this system reflected the increasing need for organized land division as urban and suburban areas developed, allowing for efficient planning and record-keeping of numerous individual properties within a defined area.