Key legal question
Whether the increased annual use compensation could be applied to the existing concession despite the 1993 reservation clause.
Extracted holding
The concession did not guarantee an unchanged fee for the whole term; the reservation of new legal provisions allowed adjustment, provided the marina could still be operated economically.
Extracted reasoning
The reservation was specific and covered later legal changes. A fee increase based on new statutory and regulatory rules is permissible unless it makes continued operation economically impossible, which the court did not find.