Read your lease. The terms of the lease will govern everyone's legal obligations. There is extensive caselaw, that real property improvements, attached to the land, belong to the land. There is extensive caselaw, because there are frequently disputes as to what constitute a permanent improvement. Take photos of the property, improvements and your lease, for a consultation with a property lawyer. A consultation fee will give you guidance and options, regarding your chances at successfully litigating or negotiating a settlement.