No steeplechase course built entirely within the confines of a race course used for races on the flat shall be approved by the commission unless the circumference of said race course, measured along the inside rail thereof, is at least one mile. Nothing in this section, however, shall affect steeplechase courses approved by the stewards of the National Steeplechase and Hunt Association prior to the enactment thereof or courses under the jurisdiction of the hunts committee.
N.Y. Comp. Codes R. & Regs. Tit. 9 § 4052.1