For the purpose of promoting health, safety, morals, comfort or the general welfare of the unincorporated portion of the township, to conserve and protect property and building values, to secure the most economical use of the land, and to facilitate the adequate provision of public improvements all in accordance with a comprehensive plan, the township board of any township to which the provisions of sections 65.650 to 65.700 are applicable shall have power after approval by vote of the people to regulate and restrict, by order of record, in the unincorporated portions of the township, the height, number of stories, and size of buildings, the percentage of lots that may be occupied, the size of yards, courts and other open spaces, the density of population, the location and use of buildings, structures and land for trade, industry, residence or other purposes, including areas for agriculture, forestry, and recreation. The provisions of sections 65.650 to 65.700 shall not be exercised so as to impose regulations or to require permits with respect to land, used or to be used for the raising of crops, orchards or forestry or with respect to the erection, maintenance, repair, alteration or extension of farm buildings or farm structures. The powers granted by sections 65.650 to 65.700 shall not be construed:

(1) So as to deprive the owner, lessee or tenant of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted;

(2) So as to deprive any court of the power of determining the reasonableness of regulations and power in any action brought in any court affecting the provisions of sections 65.650 to 65.700 or the rules and regulations adopted thereunder;

(3) To^* authorize interference with such public utility services as may have been or may hereafter be authorized or ordered by the public service commission or by permit of the county commission, as the case may be.