Temporary wooden sidewalks or stairways in sidewalk areas may be constructed in hilly areas or unimproved streets; provided, however, that no such wooden sidewalks shall be constructed prior to permission having been granted by the Director of Public Works. The Director of Public Works is hereby authorized to grant such permits to owners of fronting property or their duly authorized agents when in his judgment public interest and convenience require the construction of a wooden sidewalk or stairway. Every person, firm or corporation owning any real property, fronting on any street where wooden sidewalks now are, or hereafter may be laid, must drive down, or cause to be driven down, and at all times keep, or cause to be kept driven down, even with the upper surface of such sidewalks, in front of such real property, all nails and spikes used in such wooden sidewalks.
The Director of Public Works is hereby authorized to order the owner of the fronting property to remove the temporary sidewalk or stairway and to construct a concrete sidewalk in accordance with the provisions of Section 703 hereof, when in the judgment of said Director, public interest and convenience require such removal and construction.
The order shall specify the time within which the work is to be completed, and also the time within which the owner must declare, in writing to the Director, his intention to do the work.
The Director, upon receiving written notice of the intention to comply by the owner, or his authorized agent, may if requested by the owner, grant a reasonable extension of the time specified in the order for the completion of the work.