Leases of commercial space–such as offices and retail stores–are highly complex and are always drafted to benefit the landlord. Because they tend to be “printed form” documents, you may be tempted to think they are not negotiable. Not so. Your attorney should have a standard “tenant’s addendum,” containing provisions that benefit you, that can be added to the printed form lease document. He will also be able to advise you on what the owner’s responsibilities to you should be.