I heard the same letter about remodeling a couple of buildings in New York. One of them was the 107 building, it seems that the cafeteria had to be shut down a couple of years ago due to health problems. On the bright side the upgrades might be to make the building more marketable, but I think they just want to spend money on their empire.
The numbers do show increases. I wonder how much the world population has increased over the last year (probably more than 3%). We live in an area just outside of Las Vegas with a 13 % growth rate. So, every now and then I would hear that Jehovah blessed us because of our growth, which would not even compare to the growth of the community. But, if you attended a hall that was in an area that had no growth, the trend at the hall would be stagnant or show a negative trend (obviously no blessing from Jehovah there).