National Assessment Corporation (NAC) provided various environmental and engineering assessments, such as Phase I Environmental Assessment services and Property Condition Reports (PCRs) nationally until 2004. National Assessment Corp was sold to LandAmerica Assessment Corporation (LAC). Subsequently, all of the assets of the former National Assessment Corp were purchased out of bankruptcy on March 27, 2009 by Partner Engineering and Science, Inc. a national due diligence company.
Partner regularly updates old National Assessment Corporation reports for clients. If you are in need of an update call 800-419-4923 or email [email protected].
Please continue the relationship! Partner Engineering and Science’s professional staff is qualified and experienced and are able to perform a vast array of environmental and engineering services, ranging from Phase I ESAs to Property Condition Assessments to Subsurface Testing to Litigation Support.
National Assessment Corporation was formed in 1997 and was headquartered in the San Francisco Bay Area. For formal notices see www.NA-Corp.com.
NAC grew to be a national company rather quickly and in just four years became one of the national largest providers of due diligence with offices in Orange County, Alameda, Utah, Atlanta, New York, New Jersey, and Chicago.

June 22, 2026
Partner has named Frederick Ellington, AIA, LEED AP, as Technical Director in its Construction Services division. With 30+ years of experience, he strengthens the firm's construction risk management, due diligence, and project advisory capabilities for commercial real estate clients.

May 27, 2026
Capital planning in commercial real estate has entered a new phase. In addition to traditional lifecycle replacements, managers now face a growing set of capital needs driven by energy ordinances, decarbonization goals, and climate risk. These drivers are no longer peripheral considerations; they are central to how capital plans are developed, prioritized, and executed.

June 05, 2026
Partner Property Consultants, the European subsidiary of Partner Engineering & Science, Inc. (Partner ESI), announces that Antoine Yeprem joined the company in June 2026 as Senior Consultant, Real Estate Due Diligence, in Germany.




