5k sqft “underwater parcel” for sale in SF for $250: what’s the point?

Found on Zillow. I’m trying to figure out what would justify such a purchase: * Hoping that it gets landfilled in the future so that you have useable land? * Use it as is, as a [park free] mooring point for a sailboat? * Moore a houseboat like in Sausalito? * Sell it back as is in a few years for a 100% or more profit? Am I missing something? Anyone interested? Thanks for reading!