I first noticed this McDonald's (4060 S. I-35, San Marcos, TX) around 2015, noting its unusual brick architecture. Unsurprisingly, it used to be a Schlotzsky's (closed around 2004) but more surprisingly, very little had to been done to it architecturally. The inside was updated, of course, but it still retained all of its features, like the restroom locations, and the ordering setup. These pictures were taken in August 2019.