157.3. As soon as a regional park is established, the Community may enter into an agreement with an owner or holder of a right on an immoveable within the limits of such park providing that(a) the owner or the holder conserves, within the limits prescribed by the agreement, his right on the immoveable for a period fixed in the agreement;
(b) the owner or the holder grants to the Community a right of pre-emption on the right that he holds;
(c) the owner or the holder commits himself not to make improvements or changes to the immoveable without the consent of the executive committee;
(d) in the case of a total or partial expropriation of the right that he holds, the owner or holder may not claim any indemnity by reason of an increment-value from which the immoveable or right that he possesses on it may benefit following the establishment of a regional park or by reason of improvements or changes made to the immoveable without the consent of the executive committee or with such consent, if the agreement entered into at the time that the consent was granted was such;
(e) any other condition related to the use of the immoveable or the right.