R.I. Gen. Laws § 44-3-14: Notice to tax assessor on conveyance of tax-exempt realty.

Every firm, business, corporation, or other body which is by any special or general law, or by other means, exempted from the apportionment of any tax upon its real property, shall, within ninety (90) days of the execution of a contract of sale or deed or other form of conveyance, file with the assessor of the city or town, wherein the property is situated, a notification of the conveyance.