No lot or parcel of land in the Joaquin Village PRO zone shall not have a building or structure located on 500 North street that exceeds forty (40) feet along the front building line, including any exposed subgrade parking structure. Twenty-five (25) feet beyond the front building wall along 500 North street building height may increase to forty-eight (48) feet. All portions of a structure more than fifty (50 feet back of the front building line shall not exceed a height of fifty-five (55) feet. Exceptions include those permitted by Section 14.31.060, Provo City Code. Chimneys, flagpoles, towers and similar structures not used for human occupancy shall be excluded in determining height.