R.I. Gen. Laws § 45-25-30: Payments in lieu of local property tax.

The property of an authority is exempt from all local and municipal taxes. An authority shall pay to the city a sum fixed annually by the city. A city may:

(1) Fix a sum to be paid to it annually by an authority in respect of each project; or

(2) Agree that an authority not pay or be liable to pay any sum whatsoever in respect of a project or projects for any year or years; or

(3) Agree with an authority or government upon the sum to be paid by the authority for any year or years in respect of a project or projects, or accept or agree to accept a fixed sum or other consideration in lieu of the payment.