A. Immediately after being appointed and taking the oath, the special master shall send notice by registered mail to all persons who have appeared in the action, or to their attorneys of record, and to all others having any interest in or lien upon the real property sought to be condemned, as shown by the records of the office of the county recorder, and to guardians ad litem appointed pursuant to the provisions of section 12-1146. The notice shall be addressed to such persons at their respective last known addresses and shall be substantially in the following form:
TO WHOM IT MAY CONCERN:
Special master appointed by the court."
B. The special master shall also cause a copy of the notice to be posted in conspicuous places on the property sought to be condemned.