re: I need help estimating property value on real estate.

If the potential buyer sought you out then its a near guarantee they are not offering you full value.

To you this is a MH park, to another this may be much more valuable for another use.

Contact a few commercial brokers and tell them you may be interested in selling. Brokers will usually give you alot of market information about your property during the pitch to get you to let them represent you. Its free information until you sign a contract with them.