If you've ever taken a walk through the streets of Lincoln Park, you've probably stumbled upon a few gorgeous urban mansions that you wouldn't mind stepping inside for a quick look around. You could knock on the door and ask nicely, but you'll probably have better luck if you attend the City Style House Tour on May 17. The event will allow architectural enthusiasts to walk through five expansive private residences in Lincoln Park, preceded by a catered reception at Boka. We got a sneak peak inside three of the mansions that will be included in the tour. Try to contain your real estate envy.