If you were advised by the landlord that new siding and windows would be placed on the rental before you move in and this has yet to happen, I would write the landlord as to when he or she plans on doing the upgrades to the property keeping a copy of the letter for future reference and need.If the landlord does not upgrade the unit with new windows and siding, unfortunately there is nothing that you can do about the situation unless the current windows and siding are unacceptable and create water intrusion. The reason is that new siding and windows really do not impact the fair rental value of the property you are renting.