①Real property income means income arising from renting out real property, a right on real property, a vessel, or an aircraft (hereinafter referred to as "real estate and other such property" in this paragraph) (this includes establishing a superficies right or farming right or doing something else that gives another person the use of real estate or other such property) (other than anything falling under the category of business income or capital gains).

②Real property income is gross revenues constituting real property income in the relevant year, less necessary expenses.