\nIn the rarefied world of the mega-rich, those with a taste for sailing face a problem: where to park one’s superyacht.You can hardly haul it out of the water and stick it on the drive – no matter how grand your mansion.Of course there are marinas aplenty that cater to owners of the likes of the UAE-built 47 metre Majesty 155, the biggest superyacht yet to emerge from Gulf Craft. But if you like to keep your eye on your prize while not at sea, the problem remains.And there are other considerations. The ultra-wealthy yacht owner has to pay for a crew, which can cost more than US$1.4 million, cover its maintenance, which occasionally totals more than $1m a year, and shell out for docking fees, which can cost more than $350,000 annually. Cutting corners on the first two expenses is not really an option, but the dockage costs, at least, can be mitigated.Recently, a spate of houses with their own private deep-water docks have hit the market (see videos below), so owners can sail in and park their yachts free of onerous charges; convenient and cost-saving to boot. Here are a few such properties decked out with their own private docks. It might not be the only reason to buy these estates, but it sweetens the deal. Shelter Island, New York, US32 million, Sotheby’s International RealtyThis landmark residence rises from the head of a bluff with lush green lawns rolling from the wraparound porch to the shores of the Shelter Island Sound. Its flag pole is the mast from the vessel Sir Thomas Lipton raced in the 1930s for the America’s Cup.<div class=”embedObjects videoWrapper”>