The Utah Supreme Court has affirmed and applied the doctrine of "boundary by acquiescence" under which a border is set informally when neighbors recognize a line between their properties. Q-2 LLC v. Hughes, 368 P.3d 86 (Utah 2016). The court noted that title shifts at the point when the parties act to satisfy the doctrine not when the border is recognized by a court. Establishment of boundary by acquiescence in Utah requires (1) occupation up to a visible line marked by monuments, fences, or buildings; (2) mutual acquiescence in the line as a boundary; (3) for at least 20 years; (4) by adjoining owners. The doctrine differs from adverse possession because it is based on mutual permission rather than adverse occupation (occupation that is non-permissive).