Three World Trade Center is looking to be embarrassingly short. What was planned to be a skyscraper near the center of the redevelopment of ground zero can't find the big tenant anchor it needs. The building is currently seven stories, fully seventy-three short of what had been planned for the site. Even with a number of subsidies from New York City, Crain's estimates that a 400,000-square-foot tenant would need to spend about $100 million just to outfit an office. In this economy, Larry Silverstein is having a hard time finding a company ready to dish that out.