Final answer:
The Rectangular Survey System is the best method for a 640 acre tract of land as it uses a grid system of townships and sections that is more precise for large, regular parcels.
Step-by-step explanation:
The method of legal property description that would work best for Jon, who purchased a 640 acre tract of land, is the Rectangular Survey System. This land division system uses a rectangular grid to divide land, which is suitable for large and regular parcels like the 640-acre tract that Jon has purchased. The cornerstone of this system is the division of land into townships and sections. Specifically, a township is a square parcel of land six miles wide, which is then divided into 36 one-square-mile sections. Each of these sections is 640 acres, exactly the size of Jon's property. This system was established by the Ordinance of 1785, which explains the method by which land should be divided to prepare for government sales. The Rectangular Survey System aims to simplify property descriptions with a uniform grid pattern, which is easier to manage and more clearly defined than the irregular plots described by Metes and Bounds or Long Lots systems.