Getting a parking spot across the street from your office is a challenge in this city. But Barry Diller has his super-yacht–the world’s largest private sailing vessel, the Eos — moored directly across the street from his IAC offices. It’s believed to be costing Diller about $2,000 per day, mere pocket change for the mogul, to keep his 305-foot tri-mast craft at Chelsea Piers. He’s racked up about $40,000 in docking fees since the Eos arrived from Martha’s Vineyard and Boston after sailing here to serve as a party venue for wife Diane von Furstenberg‘s new fragrance on June 5. About 85 lucky guests got a two-hour cruise for the fete. Diller’s wife has her studio in the nearby Meatpacking District. But time’s running out to admire Diller’s mega-vessel, for which he paid a reported $100 million: It’ll soon set sail up the coast and then over for a party in St. Tropez next month, sources said. A rep for Diller declined to comment.