R.I. Gen. Laws § 34-4-29: Governmental covenants and restrictions.

Notwithstanding anything in this chapter to the contrary, nothing in this chapter shall be deemed to limit the duration of expiration of any restriction, whether recorded or not, that is contained in the written decision of any governmental body, agency, or permit-granting authority. If said covenant or restriction is unlimited in time in the decision, then it shall be deemed to be a perpetual covenant or restriction.