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.

May 27, 2026
In cities across the country, historic industrial assets continue to present challenges and untapped potential. For developers willing to navigate the complexity – and for advisors equipped to translate that complexity into actionable insight – these properties can become catalysts for long-term urban reinvestment.

May 20, 2026
Corey Myers discusses how proactive indoor air quality programs help commercial property teams prevent mold, moisture, and tenant complaints before they escalate.

May 20, 2026
Frank Krech, Sr. Engineer at Partner, brings years of expertise in structural engineering, building envelope consulting, & restoration engineering.




