SAN SIMEON – It's one of the most stunning chunks of waterfront real estate in California. Largely unpaved, unwired, unpiped and untouched by the public, it is home to zebras, and seals the size of Hummers, and carries the enduring stamp of an American icon. The Hearst Ranch is believed to be the largest undeveloped, privately owned property on the coast. "We think it's as special as they come," said Stephen Hearst, 47, the great-grandson of newspaper publisher William Randolph Hearst, who inherited land that his father bought in the 1860s and was the force behind the famed Hearst Castle....