You will want to hire a qualified appraiser who is a member of an accredited group. There are 3 groups, the AAA,ASA and ISA. I am an ISA member located in NW PA so my travel charge to NY or CT may be quite high.
Each one of the groups has a 'find an appraiser' section to their site and you can choose the best fit from there. Here are the links for you:
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