But if the MTA’s preliminary figures are right, they wouldn't be unprecedented: New York pays drastically more for most urban rail infrastructure projects than other jurisdictions around the world.
Of the four urban rail projects under way around the world that cost more than $1 billion a mile, three are in New York City. Milan is about to open a 3.5-mile fully underground subway line, with seven stations, at a cost of just more than $700 million, just slightly more than the MTA might spend to repair just the South Ferry-Whitehall station.
Let’s hope the MTA finds a way to come in far under budget. If they don’t, the best course of action is an unappealing one: closing the station permanently.
Imagine that the South Ferry-Whitehall station just didn't exist. We are in essentially that situation already: The MTA is running R trains through the station (though they don't stop), and the No.1 is currently terminating before South Ferry. Both lines have stations about one-third of a mile north of the closed station, so closing South Ferry would subject its users to about a five-minute walk.
If that were the status quo, and we were presented with a plan to build a new subway station on the site of South Ferry at a cost of $600 million, the city should vote "no" -- especially because, as sea levels rise, the station will face greater risk of similar flood damage in future storms.
Of course, the best response to excessive infrastructure costs isn't to stop building. It's to bring costs down by addressing the planning, engineering, contracting and labor-relations failures that have driven U.S. infrastructure costs so high. As we contemplate the need for flood barriers to protect lower Manhattan from storm surges, making big infrastructure projects affordable will only become more urgent.