Must I pay $1,500 to a hired worker with whom I verbally agreed upon this amount, while he understood the agreed-upon amount to be $1,200 and was content with that?

Leasing is akin to selling, and for its validity, the offer must align with the acceptance. Therefore, if the lessor offers a rent of $1500, and the lessee believes it to be $1200, the leasing contract is invalid. In this case, if the benefit has been utilized, a customary rent becomes due, which is determined by experts in the country where the transaction took place.