port facility. During World War II, it was the principal port for the Pacific campaign. Today it is part of the Golden Gate National Recreation Area and the site of several cultural facilities. The entire fort area is listed as a historic district on the National Register of Historic Places, with 49 buildings of historic significance, spread over . while the lower port area is a National Historic Landmark District, designated for its role in World War II. Geography Fort Mason can be split into two distinct areas. The upper area, sometimes called Fort Mason, is situated on a headland and was the site of the original coastal fortifications. The lower area, Fort Mason Center, is situated close to water level to the west of Upper Fort Mason, and is the site of the former military port, with its piers and warehouses. The Marina Green lies to the west of Fort Mason, while Aquatic Park is to the east. History Earlier private ownership by John C. Frémont The nucleus of Fort Mason was a private property owned by John C. Frémont, the explorer of the western U.S., who also spearheaded the conquest of California from Mexico, and ran as the first presidential nominee of the extant Republican Party in 1856. As alleged in a 1968 federal lawsuit filed by his descendants over the 70-acre parcel then at issue, Frémont bought a 13.5-acre property in the mid-1850s for $42,000, and then improved it by about $40,000. Appointed a major general in the Union army at the start of the Civil War, Frémont's repeated serious conflicts with President Lincoln led him to resign by late 1862. In 1863, the government seized the property without payment, by executive order of Lincoln, on the grounds it was needed for the war effort. Frémont would again contest the US presidency in 1864, running as the candidate of Radical Democracy Party, only resigning the effort when Lincoln fired a political enemy in his cabinet as a concession. The 1968 lawsuit was perhaps the last shot of a century-long legal struggle to obtain compensation for the seized realty. In 1870, the government returned property to 49 parties in the vicinity, but not to Frémont and a few others. At that time, Frémont was still very preoccupied with enough of the vast fortune he had made through gold-mining before the Civil War that the matter was unlikely of