Reunion Tower is part of the Hyatt Regency hotel (the multi-level, blue building on the right in the picture below). It houses both an observation deck and a revolving restaurant (Antares, which puts on a great Sunday brunch.) At night, Reunion really shines. It is dotted with lights when the sun goes down. On no schedule I can find, programmed shows are visible for miles when the entire bulb's lights form patterns. Christmas lighting is a yearly theme. When the Dallas Mavericks played in Reunion Arena below, and on the rare nights when they won in those years, Reunion Tower itself pulsed with lights.

Trivia from the Reunion Tower web site:The elevator trip to the top takes 68 seconds; the restaurant revolves once every 55 minutes.