The First National Bank of Oklahoma City, a monumental financial institution in downtown Oklahoma City, was officially declared insolvent and closed by federal regulators on July 14, 1986. The closure marked one of the most prominent regional banking failures of that economic era, stemming from severe real estate and energy loan defaults. The iconic art deco skyscraper housing the institution eventually underwent extensive historic redevelopment years later to transform the vacant tower into a vibrant mixed-use architectural masterpiece.