12 CFR 303.44: Special provisions.

(a) Emergency or disaster events. (1) In the case of an emergency or disaster at a main office or a branch that requires that an office be immediately relocated to a temporary location, banks shall notify the appropriate FDIC office within 3 days of such temporary relocation.

(2) Within 10 days of the temporary relocation resulting from an emergency or disaster, the bank shall submit a filing to the appropriate FDIC office, that identifies the nature of the emergency or disaster, specifies the location of the temporary branch, and provides an estimate of the duration the bank plans to operate the temporary branch.

(3) As part of the review process, the FDIC will determine on a case by case basis whether additional information is necessary.

(b) Redesignation of main office and existing branch. In cases where a bank desires to redesignate its main office as a branch and redesignate an existing branch as the main office, a single filing shall be submitted.

(c) Expiration of approval. Approval of a filing expires if within 24 months after the approval date a branch has not commenced business or a relocation has not been completed.