The Rest-Rooms are a landside building. That means it collects passengers. The Rest-Rooms are the cheapest and the first landside building in the whole game. Costing only 490 AirCoins. It is also the worst. With 0.1 passengers per minute. They are almost identical to the Porta Potties which are unlocked when you have explored every country in Asia. It has a size of 3x1.
Collects 3 passengers every 30 minutes
Passengers per minute: 0.1