Article L145-33 of the French Commercial code
The amount of rent for renewed or revised leases must correspond to the rental value. Failing agreement, this value is determined on the basis of: 1 The characteristics of the premises in question; 2 The purpose of the premises; 3 The respective obligations of the parties; 4 Local commercial factors; 5 Prices currently charged in the vicinity; A decree in the Council of State specifies the content of these elements.