Circuit City being listed among the retailers that left in 2008 raised red flags for me. Hmmm, what happened in 2008, and with Circuit City?

I'm not sure about the parking lot sinking vs. the buildings floating. On one hand, it does seem like a heavy building wouldn't stay put while the plain asphalt sunk down under virtually no weight. But maybe the foundations were properly compacted while the rest of the parking lot wasn't? Or some other steps were taken to prepare the (known) landfill for a heavy building, but nothing was done for just a plain tarmac? Because the heaviest structures floating upward while the rest of the parking lot stays put doesn't seem intuitive to me either.