41. If an immovable is the subject of a declaration of co-ownership pursuant to article 441l of the Civil Code of Lower Canada, each of its portions under divided ownership constitutes a separate unit of assessment and must be entered as such on the roll in the name of its owner.
The share of a coproprietor in the common portions of the immovable is part of the unit of assessment constituted by his exclusive portion of the immovable.