69. A reserve shall prohibit, during its term, any construction, improvement or addition on the immoveable affected by it, except repairs. If the immoveable is expropriated before the expiry of the term, the appraisal for indemnity must be established according to the date of the expropriation, but without taking into account the increased value attributable to the establishment of the reserve, the expropriation or the carrying out of the public works following the expropriation.
The object of the reserve may also be the establishment of a servitude of prohibition of access or other real servitude. The value of the damages then resulting from the subsequent establishment of the servitude is appraised on the date of the establishment of the reserve.