A plat is a property survey that describes the dimensions and location of lot lines, streets, and easements. A plat also establishes the lot, block, and subdivision name used in real estate transactions. A plat is a legal document complete with a drawing of the property boundaries, a written description of those boundaries, a dedication statement, an owner’s certification statement, a title block, and approval statements. A licensed land surveyor or engineer must prepare plats. A plat is not the property survey required by mortgage companies when closing the sale of the property.