Earlier in the year I went to the Undermain Theatre in Deep Ellum for a play (Time In Kafka, it was excellent by the way), and the building wowed me. It's called 3200 Main, and houses not only the Undermain (in the basement), but also an architecture firm and many residential lofts. After the play I climbed the stairs and discovered a beautiful rooftop patio/lounge with a gorgeous view of downtown.
Please go support the Undermain and see some live theatre. Dallas is lucky to have such a great theatre company. And while you're there, enjoy the great setting.