I recall reading an article about a local coffee shop. A number of new buildings were built around it, all residential condo's. The condo's in the buildings were completely sold out, hundreds of units, yet it was a ghost town around there. The coffee shop, and I believe a local pub as well, ended up going out of business because despite all the units being purchased, nobody actually lived in them.
Similar experience, my office is in the heart of downtown, right on the water. A beautiful building went up beside us, all condo's for sale, starting at $1.5 million. They got bought up instantly. However, once the building opened, I looked out my window and into a building where 90% of the units remained completely empty (no curtains) for well over a year until I switched desks. Foreign investors buy up all this property and it just sits there...empty. Meanwhile everyone that lives and works here is being priced out.