COLORADO NEWS

Observation tower proposed for downtown Denver would become the fourth-tallest building in Colorado

Jun 26, 2025, 4:59 PM | Updated: Jun 27, 2025, 10:30 am

The Denver skyline isn’t the most recognizable. Sure, we have the “Cash Register Building,” but that’s it really. Well, that could be changing in a big way!

A spiraling 673-foot observation tower has been proposed for Denver’s skyline.

The proposed structure would become the fourth-tallest building in Denver and Colorado, which would make it taller than Seattle’s Space Needle (605 feet) and Dallas’ Reunion Tower (561 feet).

Plans submitted this week outline a sculptural, lattice-wrapped spire with an orb at the top. It would be located at 1546 California St., less than a block from 16th Street, where there’s currently a parking lot.

This isn’t the first time a very tall structure has been proposed in the area. A separate concept for an 81-story structure — taller than anything currently built in the city — was pitched in 2018. That project never came to fruition.

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Observation tower proposed for downtown Denver would become the fourth-tallest building in Colorado