A San Francisco environmental group has signed an agreement to purchase the former Golden Gate Fields and preserve it as open space and a panoramic new waterfront park, according to a report in The Mercury News. According to the report, the non-profit group The Trust for Public Land has signed a $175-million option to buy the 161-acre property from the Stronach Group. The deal is scheduled to close early next year, after which the trust said it will transfer the property to the East Bay Regional Park District, a public...