Q: A certain person owns a business and is the landlord at the same time. He decides to sell the business and lease out the property to the person who bought his business. The bank is loaning the buyer the money to purchase the business. The bank requests that the seller of the business (who is also the landlord) sign a document in which he agrees that if the purchaser of the business defaults, then the bank has the right to take over the lease (in other words, they will continue to pay the landlord rent until they find someone to purchase the business from them).
Is it permissible for the seller of the business to sign this agreement with the bank?