That's maybe because Hotel Cortez has several walled corridors and secret rooms. However Hotel Cortez is inspired by the real Cecil Hotel, also located in Los Angeles which has 14 floors, maybe they get inspiration for floors count too. This is a photo of the exterior of the Hotel Cortez, which can come in handy. Remember to keep into account the dungeons and the Penthouse. Here , instead, Hotel Cortez plans as studied by Will Drake. As you can see there are several worksheets, unfortunately the picture is not really clear because of the colors. This is the board with the rooms keys at Gabriel's checking in. They seems to be approximately eighty rooms (also taking into account the numbers of known rooms).