For the application of 1 of I of article 1636 B sexies to communes located on the territory of the Greater Paris metropolis that were members on 1 January 2015 of a public establishment for inter-communal cooperation with its own tax system, the reference rate of council tax, property tax on built-up properties and property tax on non-built-up properties relating to 2016 is equal to the sum:
a) On the one hand, the communal rate for 2015;
b) And, on the other hand, the inter-communal rate for 2015.