Add security cam that is not permanent install so you can take it with you when you move out, this should be mentioned to the atty you speak to when you talk about the roof and the lease being silent as to repairs Even if this is commercial use if your lease is that badly written your going to have to have help from a atty because if you actually had to go to court some day with this LL it would really help your claim to have previous court decisions that back up your claims , this is not like residential rental in commerical leases the tenants and landlords protections are to be spelled out in the lease where residential rental laws are regulated by states.