"Brett, unfortunately, Intel hasn't implemented such a system. The rooms' front walls are glass, which in theory means light shining on the carpeting in front of a room means the room is occupied. In practice, many occupiers (at least of the phone booths) like to work in the dark. I haven't found a good solution short of walking the floor. The Portland International Airport has implemented a smart parking space availability solution in its short term and long term parking structures. Proximity sensors with red and green lights over each space highlight where parking spaces are available. Electronic signs at the end of each aisle and the entry to each floor inform how many spots are available. Good stuff." - Brent Logan