|The Petroleum Tower is significant in the area of architecture (Criterion C: Design), at the state level, as a particularly important expression of post- WWII modernism within Louisiana. It exemplifies the omnipresent flowering of European Modernism in the American city during the middle of the twentieth century. Among commercial and institutional buildings, this was a style that seemed to sweep all before it. Indeed, when asked, more than half a century later, why he practiced Modernism during these years, Louisiana architect Sol intz offered a simple reply, That was all there was. State level significance has been chosen because the Petroleum Tower is one of a very limited number of steel and glass modular grid skyscrapers in the state from the post-war period. The period of significance under Criterion C is the date of construction: 1958. The Petroleum Tower is of local significance in the area of industry (Criterion A: Events) as a major representation of the tremendous importance of the oil and gas industry to the Shreveport economy- from the time of the first successful oil well in the area (1908) through at least the 1960s. The period of significance under Criterion A spans from 1959, the date the building opened (with a majority of oil and gas related tenants) to 1963, the present 50 year National Register cutoff. The building continued to be occupied mainly by oil and gas businesses up to and past 1963, and the oil and gas industry continued to dominate Shreveport's economy up to and past 1963.