The number of garages of this type is creeping up. According to Don Monahan over at Walker who knows about these things there are eight of them currently running and six under construction. We have a complete story and list in our upcoming PT edition that will be delivered in January.
Those numbers aren't too shabby considering that except for two, they have virtually all been delivered in the last two or three years.
There will be a sidebar on that story about the automated garages finished and under construction in the United Arab Emirates. There is one finished and two or three more in various stages of completion.