Sylvester Stallone is asking $6.75 million for his 23-acre White Eagle Ranch in the Santa Monica Mountains, where such celebrities as Tom Selleck and Sophia Loren also have homes. "He just decided he wanted to sell it," said Paul Bloch, a publicist for the star of the "Rocky" and "Rambo" films. In addition to a guest house, polo field and 25 horse stalls, the property features a 7,500-square-foot main lodge with "soaring beamed ceilings, massive jade fireplace, an office, solarium and master suite that occupies the entire second floor," real estate agent Mike Silverman said.