A Fourth Avenue tunnel would cost $500 million more than one running under Fifth Avenue, in part because it would likely include the cost of replacing the Fourth Avenue viaduct. The street is built on an elevated platform near Union Station. That aging infrastructure will need to be replaced in the not too-distant future, said Seattle City Councilmember Alex Pedersen, chair of the council transportation committee, so it might be more efficient to include that project as part of the light rail construction.
Transit Equity for All argues that the Fourth Avenue tunnel makes more sense because there are no businesses or restaurants along that street to displace. The street
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