The tower's footprint was doubled and two stories added in 1964 by then owner Kerr-McGee Corporation.

[4] Financial difficulties developed and in 1934 ownership of the building changed through a $500,000 federal court foreclosure and was later sold to R. D. Cravens and Associates in 1946.

[5] The Petroleum Building was sold again in 1952 to Kerr-McGee Oil Co.[4] who would rename it the Republic Building in 1953 after its tenant Republic Supply Co[6] and use it as additional space for the oil company and other Kerr-McGee interests.

[4] In 1962 Kerr-McGee began a significant expansion of the newly christened Kermac Building that would see the structure double its east/west foot print and add 2 stories.

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