From the Dallas Tollway:
Exit Trinity Mill Road and go West 1.3 miles past Midway & Vail... You will see a LifeTime Fitness sign on your right you will make a left on to Tarpley Road. (if you reach Marsh Lane, you have gone to far)
You will pass on your left an American and Texas flag, and the next left will be 2514 Tarpley. Bear Left to suite 110.