(a) Owners of All Frontage Enter Into Contract. No permission for the doing of any street work in or upon any unaccepted public street in the City and County of San Francisco, except in the case of main sewer construction, or the improvement of a street crossing or intersection as hereinafter provided for, shall be granted in pursuance of the provisions of this Article, unless the owners of all of the improvable frontage on a block of the street whereon or wherein such work is proposed to be done, or the authorized agents of such owners, shall have entered into a written contract for the doing thereof, then and in such case said Director may grant permission for the making of same.
(b) Prior Proceedings Instituted by Owners of 60 Percent of Frontage. Provided, however, that if the applicant for a permit to do any street work in or upon any unaccepted public street shall, subsequent to the 28th day of January, 1935, obtain contracts for the doing of said work from the owners, or authorized agents of the owners, of 60 percent or more of the frontage upon a street, between main intersections, proposed to be improved, as delineated upon a diagram accompanying the application, then the Director of Public Works shall, within 30 days after receipt of the application, accompanied by said contracts, or photostatic copies thereof, institute public proceedings, in accordance with the provisions of Article 6 of this Chapter, for the improvement of the portion or portions, between said intersections, of the street proposed to be improved, for which applicant filed no contract or contracts.
(c) Procedure for Public Work-Permit for Private Work. If the order of the Director of Public Works requiring the improvement of the portion or portions of the work not included in the private contract or contracts, be sustained by the Board of Supervisors, then the Director of Public Works shall call for bids for the construction of the portion or portions ordered done under public proceedings, and when the Director of Public Works shall award the contract for the portion of the work to be done under public proceedings, the Director of Public Works shall at the same time issue a permit to the contractor who has filed the contract or contracts for the balance of the work on the particular project.
(d) Bids May Be Rejected and Proceedings Dismissed. Whenever in the opinion of the Director of Public Works, there are not a sufficient number of bids to constitute free and satisfactory competition for the contract under public proceedings, the Director of Public Works shall reject all bids and dismiss public proceedings.
(e) Underground Service Facilities. Any contract herein authorized shall include provision for all necessary underground service facilities.