If you’re on I-35W South, take exit 52B on the right toward US-377 North/TX-121 North/Belknap St. to merge onto TX-121 North. Take the exit onto Riverside Dr. and continue on the service road.
When you get to the 4-way stop, turn left to cross to the other side of the highway. Continue on the service road for about half a mile and the office will be on your right. If you pass Hudgins Ave., you have gone too far.