Agent's Authority and Condition Precedent in Property Sale

The case concerned the validity of a sale agreement for immovable property entered into by an agent whose power of attorney was subject to a condition precedent, specifically the prior approval of the principal, which had not occurred before the agreement was executed. The court of cassation quashed the lower court's decision, reasoning that a contract executed by an agent without the prior fulfillment of a suspensive condition stipulated in the mandate is null and void, as the agent lacked the necessary and legally effective authority at the time of the sale.