Saint Paul, Minn., Legis. Code ch. 34 § 34.21

(1) Notification of violation. Whenever an enforcement officer determines that there has been a violation of this chapter, notice may be provided to the owner or occupant to take the appropriate steps to correct the violations. The notice shall:
(a) Be in writing; and
(b) Include a description of the real estate sufficient for identification;
(c) Specify the violation which exists and the remedial action required; and
(d) Include a statement that the order may be appealed to the legislative hearing officer in accordance with the procedures set forth in section 34.23 .
(2) Service of notice. Service of an order shall be adequate if provided by:
(a) Personal service;
(b) U.S. mail; or
(c) If the appropriate party or address cannot be determined after reasonable effort, by posting a copy of the order in a conspicuous place on the premises. Provided, however, that in the case of rental housing, notice shall be sent by United States Mail to the address listed on the document required under Chapter 35 of this Code.
(3) Emergency enforcement procedures. If an emergency situation exists which creates an imminent health or safety hazard or danger to the public that by its nature requires immediate action, an enforcement officer may issue oral orders to the owner, operator and/or occupant that immediate corrective action shall be taken. The oral order shall:
(a) Include a description of the premises sufficient for identification;
(b) Specify the violation which exists and the immediate remedial action required; and
(c) Specify a reasonable time for the performance of the actions required. Within twenty-four (24) hours following issuance of an oral order, the officer shall serve a written order upon the owner in the manner provided above. Failure to obey the orders shall constitute a violation subject to the penalties provided for in section 1.05 of this Code.