[Rain Man]

Mile-high skyscraper.

I agreed with cdcox on this, and voted no, though for a somewhat different reason.

Simply put, I don't think a building that large is necessary in any sense. The current tallest buildings are being built solely as a tourism attraction; it's not that there's a need to build that high. I think the cost would be very high and there are better ways to invest in a tourism infrastructure.

I think humans COULD build a building that tall, but I don't think anyone will want to, and I don't think businesses would want to be in the building. Frankly, it would be inconvenient if you were on an upper floor, not to mention a host of safety and security concerns.