The UMC, a corporate entity under a constitution, is chartered (probably by whatever state it is in), and owns the properties. To become a member of the UMC you must agree to abide by the constitution. The decision is not by canon law but by civil law. They don't have to sell the property to the congregants. IIRC.
You didn’t point to the Scriptures on this. You merely posted a man-made charter.