Permitted exceptions. Height limitations stipulated elsewhere in this chapter shall not apply to church spires, belfries, cupolas, domes, monuments, water towers, chimneys, smokestacks, flagpoles, radio and transmission towers, farm buildings or similar noninhabited structures under 150 feet in height. Structures over 150 feet in height may be permitted provided they are sufficiently set back from adjoining properties to avoid any safety hazard connected therewith and meet all state and federal air safety and electronic communications standards. Other height exceptions may also be granted where firefighting capacity will not be threatened and buffers and setbacks are also proportionally greater.