Nicholas Ackerman » Real Estate Appraisers Go back to directory. Nicholas Ackerman JC Valuation Services, Inc. Home P.O. Box 4774 Mankato MN 56002 home Work Phone: 507-456-7930work Work Email: nick@jcvaluationservices.netINTERNET Categories: Affiliates, Appraisers, REALTORS Updated 3 years ago.