The stunning  Napa Valley  residence of  San Francisco Giants owner  Peter Magowan has been  brought to the market for $13 million —seven years after the sporting giant died of cancer. Magowan, who died on Jan. 27, 2019, at the age of 76, purchased the stunning 20-acre  Helena, CA , property in 1992. It served as the primary residence for the businessman and his wife, Debby Magowan, for many years. After her husband’s passing, Debby has decided to part ways with the property, which features 15 acres of planted vines, including sauvignon blanc, cabernet, and petit verdot, as well as a sprawling main residence that spans more than 7,100 square feet. The property comes with seven bedrooms, six full bathrooms, and two half-bathrooms. Originally built in 1990, it boasts soaring ceilings, a wet bar, a resort-style pool, a hot tub, three wood-burning fireplaces, and panoramic views of the mountains.…