Tom's Urban Diner is a 24 hr MUST - Larimer/LoDo

We've been to Tom's both for brunch and also to meet friends for dinner and we were happily impressed both times. They make a mean dirty martini and have a much wider (and more delicious) array of fully legit diner comfort foods than we expected (try the Grilled Croatian Fig Jam & 3 cheese sandwich or the Colorado Hot Brown). I dare you to take less than 15 minutes to pick something from their extensively awesome menu.
http://www.tomsurban.com/denver/larimer