(1) Notice - (i) General rule. Before a written determination is made open to public inspection and before a particular written determination is subject to inspection in response to the first written request therefor, the Commissioner shall publish in the Federal Register a notice that the written determination is to be made open or subject to inspection. Notices with respect to written determinations, other than those described in paragraph (a)(3)(ii) of this section, shall be published at the earliest practicable time after this regulation is adopted as a Treasury decision. Notices with respect to written determinations subject to inspection upon written request shall be published within a reasonable time after the receipt of the first written request for inspection thereof, but no sooner than the day as of which all other written determinations open to public inspection under this section have been made open to public inspection. Notices with respect to background file documents shall be sent in accordance with the rules in 301.6110-5(a) and will be mailed by the Internal Revenue Service to the most recent addresses of the persons to whom the background file document relates that are in the written determination file.