If an interest in immovable property, entitling the transferors to enjoyment is created, it is a lease; if the permission to use land without right to exclusive possession is alone granted a license is the legal result.
2)
To ascertain whether a document creates a licence or lease, the substance of the document must be preferred to the form;
(2) the real test is the intention of the parties - whether they intended to create a lease or a licence;
3)
under the document a party gets exclusive possession of the property, prima facie, he is considered to be a tenant; but circumstances may be established which negative the intention to create a lease.
4)in your case since you are giving premises for 18 years it is better you enter into registered lease deed
5) don’t enter into business conducting agreement