I gave verbal notice to real estate agent that I won't be renewing my lease but did not put it in writing. Now they say I cannot vacate the property unless my 30-day notice is up. Can they legally waive the notice period for me under mutual agreement of termination? Also, they are selling the property and have even advertised it online. They have had two open houses. I have not been given any written notice, only verbal. Can they insist for written notices from my behalf but get away with phone calls as notices under Property Law?