After deliberation by the municipality or the public establishment for intercommunal cooperation with its own tax system, taken under the conditions provided for in I of Article 1639 A bis, the basis of assessment for property tax on built-up properties located within the perimeter of a project of general interest, within the meaning of article L. 102-1 of the town planning code, justified by environmental pollution, may be subject to a 50% reduction.
To benefit from the reduction provided for in the first paragraph of this article, the owner must send the tax authorities of the place where the property is located, before 1st January of the first year for which the reduction is applicable, a declaration in accordance with the model drawn up by the administration and containing all the information required to identify the property. Where the declaration is filed after the deadline, the allowance applies from 1st January of the year following the year in which the declaration is filed.