These sites offer real estate assessment information for buying property for a business. For sales on specific properties in any county in New York state, you can visit the county records office or contact the city or town assessor's office. Note that full market values may be off by 20% or more, due to market fluctuations. (You can also Google terms such as: <town or city name> and assessment and "New York".)
The Occupational Outlook Handbook offers links to professional associations under a profession's "More" category.
Here are some examples of professional associations: