I sometime stay at the Aloft River North on Clark street in Chicago. It shares valet parking with the Hyatt Place next door on Clark and the Fairfield Inn around the corner on Illinois. The first time I used the exercise room in the basement I was amazed how large the basement was relative to the hotel so I explored. It turns out all three hotels are part of one large building with different elevator bays but are connected at the basement level and on some of the floors. So you can literally enter the Aloft and exit around the corner at the Fairfield. Also one stay the Aloft was having elevator issues so they told you at check in how to cross over and use the Hyatt's elevators. When you look at the building form the outside the hotels look separate but they are just one large building.