What is Beneficial Use?

Legal Definition
"Beneficial use" is a legal term describing a person's right to enjoy the benefits of specific property, especially a view or access to light, air, or water, even though title to that property is held by another person. This may also be termed "beneficial enjoyment".

Compare this with a "beneficial interest", where a beneficiary has an interest in a thing ("res"), such as a trust or estate, but does not own the underlying property. This usually entitles the beneficiary to some of the income from the underlying property.

Also, compare this to beneficial owner where specific property rights ("use and title") in equity belong to a person even though legal title of the property belongs to another person. For example, companies often hold stocks or bank funds in their name for the benefit of a person.
-- Wikipedia
Legal Definition
The right to use and enjoy property according to one's own liking or so as to derive a profit or benefit from it, including all that makes it desirable or habitable, as. light, air, and access; as distinguished from a mere right of occupancy or possession. Reining v. Railroad Co. (Super. Ct.) 13 N. Y. Supp. 240.
-- Black's Law Dictionary