The building features seven foot wide cantilevered shades at each floor level which screen out the summer sun.
An innovative feature was the architecturally coordinated garage at 1602 Milam Street, which holds the tower's air-conditioning equipment leaving the top of the building free for the two-story Petroleum Club and a former observation deck.
The Exxon Building (then called the Humble Building) was the tallest building in Texas, and the tallest west of the Mississippi River, from 1963 until 1965 when it was surpassed in both categories by Elm Place in Dallas.
During the Houston Astros' 2004 NLCS run (playoffs), the top of the building was crowned by hundreds of tiny blue lights while an enormous Astros star (logo) made of white lights was hung on the south side of the building.
An observation deck occupied the top until the Exxon was surpassed as Houston's tallest by One Shell Plaza in 1971.
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