UPDATE 8/23 11 p.m.: An eagle-eyed resourceful reader sent us the demo permit, issued on August 1, for the Cox Mansion. It was demolished on August 23. We’ll continue to follow up on this story. On the corner of Preston and Beverly Drive sat the most astonishing mansion Dallas has ever seen. Most people knew … Continue reading The 1916 Beaux Arts Cox Mansion is Gone, and Rumors Are Flying