Subject to the provisions of Article 15, are included in the property income category, when they are not included in the profits of an industrial, commercial or craft business, a farm or a non-commercial profession :
1° Income from built properties, such as houses and factories, as well as income:
a From the tools of industrial establishments attached to the land in perpetuity, under the conditions indicated in the first paragraph of Article 525 of the Civil Code or resting on special foundations integral with the building;
b Any commercial or industrial installations assimilated to constructions;
c Vessels used at a fixed point and fitted out for habitation, trade or industry, even if they are only held by moorings.
2° Income from undeveloped property of any kind, including that from land occupied by quarries, mines and peat bogs, ponds, salt works and salt marshes.