Final answer:
The lot and block description measures the smallest unit of property in Arizona.
Step-by-step explanation:
In Arizona, the legal description that measures the smallest unit of property is the lot and block description.
This is a commonly used system in urban areas, where large parcels of land are divided into smaller lots and blocks with specified boundaries. Each lot is assigned a number or identifier, and this description allows for easier identification and transaction of property.
For example, a legal description might be: Lot 5, Block 10, XYZ Subdivision. This provides a specific and defined unit of property within the larger subdivision.