I remember when this opened they said they were going to start opening several...i guess there went that idea.
http://www.chron.com/entertainment/restaurants-bars/article/Del-Taco-closes-its-only-Houston-area-store-6278634.php
http://www.chron.com/entertainment/restaurants-bars/article/Del-Taco-closes-its-only-Houston-area-store-6278634.php