Is selling an apartment through an assignment system for a price greater than what was paid, after discovering the existence of usurious interest in the remaining installments, permissible or forbidden?

One should not proceed with a transaction if it includes an usurious condition. If the increase in an installment sale is usurious, then the transaction is impermissible. However, if it is in the category of selling an apartment for a higher price through installments, then it is permissible. The condition that prohibits selling the purchased item until the full amount is paid contradicts the essence of the contract, and scholars have differed on it. If the contract includes an usurious condition, it is obligatory to annul it. If annulment is not possible, then repentance suffices. Selling the apartment to another person is a valid sale, based on the view that the contract itself is valid while the condition is void.