Don’t bury our cities in mega-towers

Many longtime residents of San Francisco, Miami and other hot U.S. cities complain of "Manhattanization" when developers put up 20- or 30-story apartment complexes. In Portland, Oregon, they're debating the wisdom of 40 stories.
They should try 100 stories on for size — or not, if they value the amenities of urban life. That's the height of a megatower proposed for downtown Seattle. It was "downsized" from 102 stories after aviation authorities warned the tower could interfere with air traffic.