(a) (1) Appellant may file a single request for rehearing within two months of the date of the original decision of the Board. No request for rehearing from a decision on rehearing will be permitted, unless the rehearing decision so modified the original decision as to become, in effect, a new decision, and the Board states that a second request for rehearing would be permitted. The request for rehearing must state with particularity the points believed to have been misapprehended or overlooked by

(a) Parties to the appeal may file a request for rehearing of the decision within one month of the date of: (1) The original decision of the Board under § 41.77(a) , (2) The original § 41.77(b) decision under the provisions of § 41.77(b)(2) , (3) The expiration of the time for the owner to take action under § 41.77(b)(2) , or (4) The new decision of the Board under § 41.77(f) . (b) (1) The request for rehearing must state with particularity the points believed to have been misapprehended or overlooked