How do I find an attorney if I have a violation that my previous landlord is liable for with my business that I just sold?

You can contact your local county bar association, see if there is a local group of small businessmen who might have referrals, call attorneys listed as doing small business work. First contact your former landlord and see what they are willing to do to help you. You do not mention what the violation is for and why you need to get it removed.