Final answer:
The legal description method utilized when a subdivision plat map is present is Lot and Block.
Step-by-step explanation:
The legal description method utilized when a subdivision plat map is present is Lot and Block. In this method, land is divided into individual lots and blocks, which are then recorded on the plat map. Each lot and block is assigned a unique identifier, usually a number or letter, which is used to refer to the specific parcel of land. The Lot and Block method is commonly used in planned subdivisions, where the land is divided into designated lots for residential or commercial use.