Section 250-171-9 - CHANGE IN BASE STATE1. Once a registrant has selected Maine as its base state the registrant may only change its base state under one of the following conditions: A. If a registrant relocates its principal place of business from Maine to another participating state, the registrant must select the new participating state as its base state effective with the next registration year following the change in location;B. If the state in which the registrant's principle place of business is located becomes a participating state, the registrant must select that state as its base state effective with the first registration year in which the state becomes a participating state;C. When a Maine based registrant with an office or operating facility in Maine, but not its principal place of business, establishes an office or operating facility in a participating state other than Maine, the registrant may elect to base in the participating state in which the new office or operating facility is located effective with the next registration year; orD. When a Maine based registrant without a principal place of business, office, or operating facility in Maine establishes a principal place of business, office, or operating facility in a participating state other than Maine, the registrant must select the participating state as its base state effective with the next registration year.29- 250 C.M.R. ch. 171, § 9