R.I. Gen. Laws § 45-29-15
An authority may petition the city which created it to institute proceedings under the provisions of §§ 45-29-13 - 45-29-32 to acquire property described in the petition which the authority certifies to be necessary for a project. If the petition is acted upon favorably by the city, there shall be a definite agreement entered into between the city and the authority in which shall be stated the amount to be paid by the authority to the city for the property, or in lieu of that, that the authority shall pay to the city all sums expended or required to be expended by the city in the acquisition of the property, and may require that the city receive, before proceeding with the acquisition of the property, assurances as to payment of reimbursement by the authority or otherwise as the city may deem advisable.
R.I. Gen. Laws § 45-29-15