A: In a vacuum, a landlord should not have a unilateral right to raise rent. A landlord may have the right to raise rents periodically, pursuant to the lease document. It is very much a contract issue. It depends on the exact wording of the lease agreement. The lease agreement will also detail the requirements for valid notification concerning the agreement. My experience over 25 years of practice is that most building lease agreements expressly provide for base rent to increase each year. A court will enforce most reasonable rental, escalation, clauses, and lease agreements. If there is no obvious language in the lease, the question becomes whether rental increase is implied under the wording of the document or an amendment to it. At the risk of being repetitive, it depends on what the lease says, if anything at all.