About the Petroleum Building When it opened in 1957, the Petroleum Building was Denver’s tallest building and housed the biggest oilman’s club in the world with 1,100 members. It was a mid-century modernist high-rise with austere lines designed by Denver architect Charles Strong. The oil and gas industry was booming in the Rocky Mountain region, and Denver was the regional oil capital. At one time, thirty-three oil companies had offices in the building. Built to last, the building boasts two bomb-resistant stairways and a heavily reinforced basement. Project highlights Once the home of the biggest oilman’s club in the world, the historic Petroleum Building in Denver recently completed upgrades to replace obsolete and inefficient systems. Owners of the building sought to enhance occupany r

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