Notice of Lease Non-Renewal and Lease Extension

[Jason Fang]

I'm in a difficult situation with a tenant.  The end of the lease is 3/31 and I sent him a lease extension in February.  We then got into a heated argument over a dishwasher and now I do not want to lease to him anymore.  I sent him a 30 day Notice to Vacate on 3/1.  But he has a lawyer now and states that because I sent him a lease extension before the Notice to Vacate, I'm legally bound to continue leasing to him.  I did not sign the lease extension so how is that a legally binding contract?  What is the best course of action?  I'm anticipating the lawyer to try unconventional tactics in an attempt to extort money or convince the court to allow the tenant to stay there as long as possible.  Should I just get a lawyer myself?