There's a certain point in southeast Uptown where the restaurants start becoming few and far between. The Showmars at the Government Center pretty much has a captive market due to it's location and lack of restaurants surrounding. I came during an off lunch time, but you can see the remains of the lunch crowd that pretty much destroys the restaurant (figuratively speaking). You walk in, and there is a sign that explicitly says to form 3 lines and the cashiers will call you went its your turn.
If you are walking to the building, you will have to go through metal detectors since the building is a secure location. It's a little strange to feel like you need to go through security just to go to a restaurant, but hey, I get it.
Typical Showmars menu here... items are made to order and are quickly to you after they give you a number tent and you find a table. Since I came after the lunch rush the staff had closed of some table sections to clean, it was a little awkward when you got "fenced in" but easy enough to move a chair to go get a drink refill.