(1) After the adoption of the official map, no building shall be constructed within the boundaries of a mapped highway nor on a highway shown on the map as a proposed abandonment or relocation until a permit has been obtained, except that building construction may be undertaken without a permit, in order that private property rights are fully protected pursuant to this part.
(2) Nothing in this chapter shall be construed as relating to buildings directly concerned with strict and specific agricultural enterprises or uses of land.