In divided co-ownership, the right of ownership is divided, among the co-owners, by "fractions", each comprising a materially divided private portion (e.g. a residential unit, a parking or storage space, and sometimes even a plot of land) and a share of the common portions. To each fraction is attached an undivided right of ownership in the common portions, and sometimes the right to use the common portions for restricted use.
The fraction is the result of the division of a building to create a co-ownership. In other words, the addition of all the fractions constitutes, by the effect of the publication of a declaration of co-ownership, the co-ownership building.