I have a commercial lease for a shop with a residence upstairs. My lease covers both upstairs and downstairs. The landlord said he would move out but it has been 3 months and he still hasn't. My lease has a quiet enjoyment clause but it isn't a warranty. Can I terminate the lease? I don't want the shop any more as it is not possible for me to do business since I was planning to use the upstairs for my stock. Thank you!