When shopping for an apartment, you must find out if it is in a divided or undivided co-ownership. Even though both concepts are similar in that their ultimate goal is the partition of an immovable between several persons called co-owners, the financial and legal commitments are different.
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. an apartment, 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 condominium. In other words, the addition of all the fractions constitutes, by the effect of the publication of a declaration of co-ownership, the condominium building.