Article R3121-2 of the French Public procurement code
To estimate the value of the concession contract, the concession-granting authority takes into account in particular :1° The value of any form of option and any extensions to the term of the concession contract;2° Revenues collected from users of the facilities or services, other than those collected on behalf of the concession granting authority or other persons;3° Payments made by the concession granting authority or any other public authority or…