We have 30 years experience in all types of business dealings.
Like selling your home, you need professional advice when selling your business. What is its value, what do you do about debtors and creditors, how do you deal with your staff, what tax and GST payments will you have to make. These and many more issues are involved that will be expensive if you get them wrong.
If you are being asked to leave money in the business to help the new owner what is their credit rating and business experience. Are they going to be able to pay you when the time comes?
Remember that any guarantees you give can carry on after the sale unless you have had them cancelled. If the lease is in your name or guaranteed by you then you remain liable for the payments if the new owner (and it can be several owners later some times) goes broke during the remaining term of the lease.