Third Party Gurantee is other option, you can opt for. more
This seems like a tricky position you are putting yourself into. If you are signing different agreements with the Shop owner and the person running the business, what is the relation left between the shop owner and the person selling the business. Either one of them can cancel the agreement (as per the terms and condition of the contract) and then you will be left high and dry without either the business or the place to run the restaurant from.
What sort of the security you are getting from the person renting his business to you? He can coolly collect the hefty deposit from you and further monthly emoluments you are paying (till the time you are able to pay) and then refuse to return the deposit or make excuses. What are you going to do? What if the shop owner terminates the contract and the other person does not refund the deposit?
If you are paying hefty deposit it is better to buy out the business completely or make him a partner in the business.
Or just sign an agreement with the shop owner and start a new business (restaurant) altogether. more