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Article 1029. Offer

(1) An offer to contract is a proposal, addressed to one or several person, which contains all essential terms of the future contract and which reflects the intent of the offeror to be bound by the acceptance of the offer.
(2) An offer has effect only from the time it reached the addressee before it is revoked.
(3) A proposal addressed to an undetermined circle of persons (public offer) is a call for offers if it contains not explicit intent to be bound by acceptance.
(4) An offer must be firm, undoubtful, serious and complete.

LPA C civ, art. 29 [Statutory Building Right over Public Rent and Royalty]

Article 10. Components of a Condominium