public Building()
{
this.personel = new List <Personel>();
this.elevators = new List <Elevator>();
this.floors = new List <Floor>();
this.arrivedAt = new ElevatorArrivedAt(ArrivedAtMethod);
}
public Elevator(IEnumerable <Floor> floors, ElevatorArrivedAt onstop) : this(floors)
{
this.OnStop = onstop;
}