Going vertical around transportation hubs is really the key. Rent the new high value space near hubs to pay for construction and operation.
Los Angeles 30/10
—— “People laughed at me when I said Los Angeles would become the cleanest, greenest U.S. city. But we could attain that goal if we go vertical and build transit villages around all the new stations,” said Villaraigosa. "I told President Obama that it’s important that we build these new transit lines during his administration.”——-