I've seen a lot of people who have hotels or lots of different shops on their residence. However, these businesses often run into trouble because there is nothing protecting the rights of tenants and nothing stopping tenants from doing things to other tenant's or the landlord's stuff if flags are granted.So here's the basic premise:The landlord would buy 'lease signs' from the Empire Shop. Basically, a specially-enchanted sign. There would be bulk discounts for more lease signs, so a player could buy a lot and sell them individually to make a profit.The tools would enable the landlord to allocate areas of their residence as lease areas by placing down the sign. They would write the lease cost and rate on the sign.The algorithm would scan upwards until it hit a 9-block wall of solid blocks. From the center point, it would scan outwards in all 4 directions until it hit four 2highx3wide areas of solid blocks, glass, or doors. The floor where the sign was placed would serve as the bottom edge. These 6 edges would serve as the cube which is the lease area. It would then ensure that all walls were solid blocks, glass, or doors.Once the details are confirmed by the landlord, a player who is interested in leasing the area would be able to sign the lease by clicking the sign and typing a confirmation on their end.The tenant can now place/break blocks, build shops, open chests, and use all equipment in the lease area (exclusive of the walls).The landlord would not be able to access the area (inclusive of the walls) while the lease is active (unless expressly written on the sign). They would also not be able to activate fire spread in the residence.The walls would be something that neither the landlord nor the tenant would be able to modify after the lease is signed. They would protect from lava or water or falling blocks. In addition, firespread would be disabled during the lease period.To renew the lease, the tenant pays into the rent by a command. (Basically an escrow.) They can put as much into the rent as they wish, and it is dispensed to the landlord at each renewal date.Tenants would extend the derelict of the residence by their activity, so it would not go derelict unless all tenants and the landlord went inactive.If the landlord no longer wishes to have any leases, they can use a command which provides at least 30 days notice to all tenants. Any additional rent would be refunded and in 30 days the landlord can reclaim the area.Obviously, the landlord cannot unclaim the plot unless all leases have expired.Once a lease expires, the landlord has the opportunity to clean up the leased area and allow another tenant to take on the lease.I think I've got all the holes covered, but if anyone happens to find one please let me know.