A. The zoning power conferred herein shall not apply to the erection or use of the usual farm buildings for agricultural purposes or to the planting of agricultural crops, to the extraction of oil or natural gas, or to forestry activities.

B. The power of the board to establish building and construction codes shall not apply to:

1. A single family residence located on a separate parcel of land under one ownership, containing twenty (20) acres or more in area;

2. Any lands which, as of the effective date hereof:

a. are devoted to manufacturing and/or industrial use, or

b. have been acquired by any owner for expansion of facilities devoted to manufacturing and/or industrial use, so long as such use or ownership continues;

3. The acquisition of property or easements for or the installation, construction, maintenance or use of structures, facilities and property of electric cooperatives or public utilities subject to the jurisdiction of the Corporation Commission of the State of Oklahoma, or other similar state or federal body.

C. For purposes of this section, the term "forestry activity" means any activity associated with the reforesting, growing, managing, protecting and harvesting of timber, wood and forest products including, but not limited to, forestry buildings and structures. The term "forestry activity" shall not pertain to areas and property which would restrict access to public road construction or right-of-way.