I. – The rental values of the built properties mentioned in I of article 1496, industrial establishments mentioned in article 1499 and premises whose rental value is determined under the specific conditions set out in article 1501 as well as that of non-built properties are updated according to a procedure comprising:
1° The annual recording of changes affecting these properties;
2° The updating, every three years, of the valuations resulting from the previous general revision;
3° The carrying out of revisions under the conditions laid down by law.
II. – The rental values of the built-up properties mentioned in article 1498 are updated according to a procedure involving:
1° The annual recording of changes affecting these properties;
2° The annual modification of the location coefficients under the conditions provided for in II of article 1518 ter;
3° The updating provided for in III of the same article 1518 ter;
4° The annual modification of tariffs under the conditions provided for in I of the said article 1518 ter.