My reference to an anti-illumination ordinance was tongue-in-cheek, as I'm not aware of any legally-binding restrictions. However, now I'm really giving credence to the notion that Denver *does* impose some form of restriction that either prohibits or strongly discourages the kind of profound and epic illumination displays we see in other cities.
Let's face it - if 1144 Fifteenth Street were in a city like Atlanta, Dallas, Charlotte or Miami (just to name a few), the building would be bathed in light from podium to the crown, fully ablaze with the side notch lighting complementing the crown - perhaps even using rotating color loops to put on a fascinating color show at night that would astound both citizens and tourists alike. In Denver, nothing. Complete darkness. No crown lighting, and as far as I know, the side notch lighting was "tested" for a few nights but isn't permanent - I'm not sure if that too has been cancelled.
Either Denver does - indeed - strongly restrict (via ordinance or "gentlemen's agreement") the exterior illumination of its buildings, or the city is beyond profoundly ignorant on how to encourage a dazzling, engaging, post-modern skyline that is able to compete with our global counterparts. I'm not sure the developers are to blame; Hines came in with big plans for crown lighting when they released initial renderings for 1144, and Block 162 featured prominent crown lighting as recently as last month. There was no reason for these developers to cancel their illumination plans after they had already released renderings indicating their desire to incorporate said illumination. At this point, I refuse to believe that so many proposed illumination plans were cancelled by simple happenstance. There certainly seem to be external factors at play here, discouraging developers from lighting up their towers. This can't be chalked up to pure coincidence, as our dark skyline speaks for itself.
The city must be interfereing or discouraging skyscraper illumination in some form, but I can't fathom why or how. It's not like we can see the mountains at night, so one would think Denver were to encourage a bright and dazzling skyline at night when the mountains disappear and we finally have the opportunity to display some civic pride without the mountains being our "wingman".