If the proposed amendment or change relates only to particular properties or district and not to the Township generally, a similar notice shall also be mailed to all owners whose property or a portion thereof is situated within any portion of the area included in the proposed change or whose property or a portion thereof is situated within 100 feet of any portion of the area included in the proposed change, provided that notice by mail need not be sent to more than 30 such owners. Notice mailed to such owners, as their names and addresses may appear upon the records of the Tax Collector of the Township, shall be a sufficient compliance with this provision. In all cases, an affidavit shall be filed by the Secretary of the Township Commissioners, showing compliance with requirements of this section, which affidavit shall include the names and addresses of all parties to whom notice was given.