As the rights and liabilities arising from claims on a contract to construct a federal building are derivative of federal statutes, federal law governs a claim of fraudulent inducement.
As the federal common law of contracts mirrors the common law, the Restatement standard of de minimis burden to investigate fraudulent inducement, the claim presented a genuine issue of material fact where a party made reasonable attempts to gain the relevant documents through FOIA requests.
http://www.ca5.uscourts.gov/opinions/pub/17/17-30091-CV0.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.