1787. Where a fraction of an immovable under divided co-ownership or an undivided part of a residential immovable comprising or forming part of a development which comprises at least 10 dwellings is sold, the seller shall give the promisor a memorandum, at the time of signing the preliminary contract; he shall also furnish the memorandum where a residence forming part of a development comprising at least 10 residences and having common facilities is sold.
A memorandum shall also be given where the same fraction of an immovable under co-ownership is sold to several persons who thereby acquire a right of enjoyment in the fraction, periodically and successively.