Before an application for the issuance of a certificate of existing use which would authorize a use of a building or premises not permitted by zoning restrictions in effect at the time of such application may be considered by the Commissioner of Buildings, a complete and accurate list of names and addresses of the owners of all the lands within a radius of 200 feet of the property affected by such application as appears on the latest complete assessment roll of the County of Nassau shall be submitted simultaneously with the application. The applicant shall send, by registered or certified mail, to each owner shown on said list, not less than 10 nor more than 20 days before the date on which the application is to be submitted, a notice addressed to such owners generally signed by the applicant, identifying the property affected by the application, setting forth the use requested and advising that any objections must be filed with the Commissioner of Buildings within 10 days of the date on which the application is to be submitted. Before the Commissioner of Buildings may consider the application, the applicant must submit to the Commissioner an affidavit of the mailing of such notices as herein provided, said affidavit to be made on forms provided by the Commissioner of Buildings.