They have gluten free buns for the burgers and sandwiches, plus you can watch them make your food, so you know if it's being contaminated. My favorite thing to get is their namesake the crown burger, which is a cheeseburger with pastrami, SO GOOD! Only downside is that their fryer is shared, so no fries if you're sensitive.
They have Franz gluten free buns.
Dedicated gf fryer is great for fries! But if you plan on getting a hamburger watch out! I got sick from eating a hamburger even tho it was on a gluten free bun. I'm guessing it had to be from where the meat was cooked/buns toasted. It's such a bummer because if they were more cautious this would totally be a go-to for us. I used to love their burgers before I was celiac! But I've been sick for 2 days trying to get over being glutened, not sure it's worth the risk again.
They used to be GF friendly but tried to eat there more recently and nobody had any clue about how to do it. They still have a dedicated fryer, however the meat is placed on the same slab as the buns, gloves don't get changed and the dressings for the burgers are the same ones used on the regular buns. Unless something changes dramatically do not attempt if you have celiac disease.