Landlord verbally agreed to break lease, won’t put it in writing…what to do??

Our business has two years left on its lease. The building is a dump, to the point where I cannot conduct business here and people have turned down jobs because of the state of disrepair of the building. When I signed the lease I included a letter stating I was signing on the condition that specific things get fixed. They have not gotten fixed. I went in last month with a laundry list of repairs that needed to be done and demanded a timeline. He said he would cancel our lease, no cost to us. A month ago I gave him a letter releasing us to sign, he has not yet returned it. I had our attorney follow up, who told him he gave us his word that he would cancel the lease. He promised our attorney he would write something up, then never did. I contacted the landlord today and he said he was working on putting something in writing, but he is really busy. I am beyond frustrated – what can I do here??