The Houston Tower was a plan for a 500-story skyscraper conceived in the 1970s to be built in Houston, originally designed as a research project for the feasibility of a 500-story building.

[1] American Architect Robert B. Sobel of Emery Roth & Sons, with engineer and fellow American Nat W. Krahl of Rice University, created a concept for a 500-story building made from 200-foot sided bundled triangular tubes.

[1][5] Since its first inception, it has remained one of the tallest buildings ever fully envisioned, and would have taken up 16 city blocks of 250x250 feet if constructed.

[2] Its design features are reminiscent of the Sears Tower, which utilizes a similar construction pattern albeit on a smaller scale.

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