The permission to occupy streets, sidewalks and parkways for the purposes of building is intended only for imperative use in connection with the actual erection, repair, alteration or removal of buildings, and shall terminate with the completion of such operation and at as much earlier time as shall be feasible, at which time the person to whom the occupation permit has been issued shall remove all material and equipment and shall place the street, sidewalk and parkway in as neat and serviceable condition as prior to the occupancy thereof.