The Promise of Purchase for a Term and Condition

Question
A brother wanted to buy a house from his brother in installments, and he stipulated that if he gathers the price of the house in the future, he will buy it. The brother agreed but with the condition that if he wanted to return to him with the apartment, it would be at market price, not the agreed-upon price. Is this sale and condition permissible?
Answer
I say, and with God's help: The sales contract must be finalized; it is not permissible to defer the contract to the future or to condition it on a clause that carries the risk of existence. Such an action is meaningless and has no value. And God knows best.
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