Bill asked people to write in with their own stories after our report on how wealthy investors are driving up real estate values in New York City and pushing out working people of ordinary means.

The architectural critic talks about why more residential skyscrapers are being built, what impact their having on the city and the trouble with trying to limit their heights.

From luxury skyscrapers -- taller, more expensive and exclusive than ever before -- the dark shadows of plutocracy are spreading across the commons of democracy.