When not mentioned in the description of the private portions prepared by the syndicate, the work or expenditures on property or in a unit by the co-owner or his/her predecessors that provide added value. The work or expenditures increase the value of the property or unit relative to its original value. This may involve the replacement of existing materials or fixtures with ones of better quality or greater value or adding new materials or fixtures. See also article 1070 of the C.C.Q.