Just being a lease holder will not give you legal ingress/eggress to the property. You need to contact the legal landowner and see if he they can get you the access. A lawyer or judge won't be able to help you, but the landlocked landowner may be willing to seek legal access, although going through the court system may take 6 months or more. Offering some cash for access may be the quickest route, but I would get your leasor to help.