Grow vertically. I saw this regularly when I was living in Hong Kong - 50 year old 5-15 story apartment buildings being bought out by developers, demolished, an

Grow vertically. I saw this regularly when I was living in Hong Kong - 50 year old 5-15 story apartment buildings being bought out by developers, demolished, and replaced with something 30-40 stories tall. High speed rail into the city (see tokyo). You can travel enormous distances in 40 minutes on HSR.