Key legal question
Whether the bank's claim for the unpaid sale price was due and enforceable
Extracted holding
No; the contractual term linked payment to handover of the premises, and that term had not occurred.
Extracted reasoning
Under Art. 75 CO, the parties validly agreed a due date tied to possession of the premises. Since the storage areas were neither taken over nor offered in the agreed finished state, and no later agreement changed the terms, the balance remained non-exigible.