I served a tenant a 30 day notice of non-renewal after her lease ended. She asked for an extension of 30 days, this would be 60 days notice. I am actually okay with this, as the rental market is very tough. But of course, I do not want this to extend past 60 days. 

My question is, I served the original notice via certified mail as required. Do I need to send the extension certified mail as well? She would need to sign and return the extension to me.