What Joint tenancy requires unities of title?

Joint tenancy requires four unities: unity of time, unity of title, unity of interest, and unity of possession. The unity of title specifically means that all joint tenants must acquire their interests in the property through the same legal document or transaction. This ensures that each tenant holds an equal share and has the same rights to the property. If any of these unities are broken, the joint tenancy may be converted into a tenancy in common.