Where a subdivision outside the corporate limits contains sewers, sewage treatment plants, water supply systems, park areas or other physical facilities necessary or desirable for the welfare of the area and which are of common use or benefit and which the City or County does not desire to or cannot maintain, provision shall be made, by trust agreements made a part of the deed restrictions acceptable to the City, for the proper and continuous maintenance and supervision of the facilities by the lot owners in the subdivision.
(1980 Code 152.21)