Any person upon whom notice is served, shall have the right, within ten days, after the date of service, to demand a hearing before the Building Enforcement Agency. Such hearing, at which the owner or owners shall have the right to be heard in full and to introduce such relevant evidence and testimony as they desire, shall be held within five days after the receipt by the Building Enforcement Agency of a written demand therefor and at a time and place then designated by the Building Enforcement Agency. The decision of the Building Enforcement Agency, affirming, rescinding, altering or modifying its original findings, shall be made within ten days after the termination of the hearing.