Vertigo is one of my favorite places to go for gf food. I have celiac and am VERY sensitive to cross contamination and have never had a problem here. They have gluten free buns for burgers and there is a designated fryer for gf fries. If you say you want something gluten free they ask if it is for an allergy and mark it accordingly. The food also happens to be delicious. Can't recommend this place enough.
They also offer vegan options, and their black bean burger is very good.
— Very
— Gluten-free items are marked on the main menu
— Most/All
— Excellent