A notice of lien is considered as refiled in the office in which the prior notice or refiled notice was filed under the provisions of 26 U.S.C. 6323 if it is refiled in the office which, pursuant to a change in the applicable local law, assumed the functions of the office in which the prior notice or refiled notice was filed. If on or before the 90th day referred to in paragraph (b)(1)(ii) of this section, more than one written notice is received concerning a change in the taxpayer's residence, a notice of lien is required by this subdivision to be filed only with respect to the residence shown on the written notice received on the most recent date. Paragraph (b)(1)(ii) of this section is applicable regardless of whether the taxpayer resides at the new residence on the date the refiling of notice of lien under paragraph (b)(l)(i) of this section is completed.
Although it is not necessary that a written notice contain the taxpayer's identifying number authorized by section 6109, it is preferable that it include such number. A return or amended return filed by the taxpayer with the Bureau which on its face indicates that there is a change in the taxpayer's address and correctly states the taxpayer's name, the address of the taxpayer's new residence, and the taxpayer's identifying number required by 26 U.S.C. 6109 is sufficient notice under this paragraph.
27 C.F.R. § 70.149
26 U.S.C. 6323