Does Duty to Keep "In Good Repair" Require Tenant to Replace Roof?

One of the most important aspects of any commercial lease is how it apportions responsibility for maintenance and repair of the leased premises, including the roof. Although there’s an infinite number of possible arrangements, tenants are generally expected to contribute to the costs of roof maintenance and minor repairs, while landlords retain financial responsibility for major repairs, replacement, and capital improvements. Of course, landlords and tenants can agree to shift these fundamental responsibilities as they see fit. But to do so requires clear language.