Under the Illinois Plat Act, when must a plat of survey be recorded?

A plat of survey must be recorded under the Illinois Plat Act when it pertains to subdivisions containing lots of less than 5 acres. This regulation is designed to ensure that any subdivision of land that is small enough to potentially lead to confusion regarding property boundaries, ownership, and land use is appropriately documented and made public. The recording of a plat helps in establishing legal descriptions of the property, which is crucial for real estate transactions, development, and town planning.

Subdivisions of larger lots, such as those containing less than 7, 9, or 10 acres, do not fall under the same requirement for plat recording, as the state has determined that larger parcels of land typically do not require such formal submission to prevent potential disputes or confusion among property owners. Therefore, only lots of less than 5 acres are mandated to be recorded as per the regulations outlined in the Plat Act.