A Titanic-sized supership that once ferried presidents, Hollywood royalty, actual royalty and even the Mona Lisa has a place in the history books as the fastest oceanliner in the world. The owners are now racing to avoid having the ship, the S.S. United States, relegated to the junk heap.

A preservationist group, the S.S. United States Conservancy, saved the vessel from being scrapped a few years ago. Its members are working with a developer to give the mothballed vessel a new life as a stationary waterfront real-estate development in New York City, the ship’s home port in her heyday.

Their big dreams, however, now face a financial crisis: Short of money, the conservancy in recent days formally authorized a ship broker to explore the potential sale to a recycler. In other words, the preservationists might have to scrap their vessel.

It came down to hard numbers. The preservationists have struggled for years to raise the $60,000 a month it costs to dock and maintain the ship, known as the Big U, which is longer than three football fields and once sailed the Atlantic with three orchestras on board. A developer only recently started shaping plans to fill the ship with tenants, an undertaking of the kind that can stretch for years even when it is not this unusual.