Opteon, an international provider of valuation, advisory, and property services, has acquired Northeastern Appraisal Associates Residential (NEA), a Buffalo, N.Y.-based appraisal management company (AMC) and staff appraisal firm. Terms of the transaction were not disclosed. This partnership expands Opteon's presence in the Northeast, strengthening its nationwide service offerings and faster turn times in the fourth largest U.S. real estate market, the company said.