Question: In which district of San Francisco is the structure that Walter S. Johnson famously contributed to preserve?
Context: Huckleberry Botanic Regional Preserve is a 241 acre regional park and nature reserve in the Berkeley Hills, in the eastern East Bay (San Francisco Bay Area) region of the San Francisco Bay Area of California.  It is within Alameda and Contra Costa Counties.  It is a park within the East Bay Regional Parks District system.  The Preserve is named after the California Huckleberry ("Vaccinium ovatum") which grows abundantly within its habitat. The Museum of Performance + Design, formerly the San Francisco Performing Arts Library & Museum, is located in the SoMa District of San Francisco, California at 893B Folsom Street.  The Museum collects and makes accessible materials about the performing arts, with a special emphasis on documenting and preserving the San Francisco Bay Area’s rich and diverse performing arts heritage from the Gold Rush to the present.  The museum produces public and educational programs, provides library services to researchers, and conservation and archival services to performing arts institutions.The Museum's collection includes personal papers of prominent artists, original costumes and design renderings, audio-visual recordings of live performances, original artwork, other artifacts and ephemera.  The Museum also serves as the official archives for many local performing arts organizations including the San Francisco Ballet, San Francisco Opera, Stern Grove Festival, and the San Francisco Ethnic Dance Festival. Folsom Street is a street in San Francisco which begins perpendicular to Alemany Boulevard in San Francisco's Bernal Heights district and ends perpendicular to the Embarcadero on the San Francisco Bay.  For its southern half, Folsom Street runs north-south, but it turns northeasterly at 13th street.  It runs through San Francisco's Bernal Heights district, Mission District, SoMa District, Yerba Buena District, and South Beach district. Walter S. Johnson (1884–1978) was a notable businessman and philanthropist in San Francisco, California.  He was one of the founders of the American Forest Products Corporation, a Fortune 500 company in the 1950s and 1960s, and of Friden, Inc., the Friden Calculating Machine Company, which developed and sold electro-mechanical numerators and office equipment, predecessors of today's computerized counterparts.  As a philanthropist, Walter S. Johnson is most famous for his 1959 contribution to the preservation of the Palace of Fine Arts, an act that ensured the endurance of the iconic San Francisco landmark. Metropolitan Anthony of San Francisco was the first Metropolitan Bishop of the Greek Orthodox Metropolis of San Francisco, a metropolis of the Greek Orthodox Archdiocese of America, under the spiritual authority of the Ecumenical Patriarch of Constantinople.  His first bishopric was that of the Eighth Archdiocesan District of the Greek Orthodox Archdiocese with headquarters in Denver, Colorado.  He was subsequently enthroned as Bishop Anthony of San Francisco as the first bishop of the newly formed Greek Orthodox Diocese of San Francisco.  He became titular Metropolitan of the Dardanelles, but retained leadership of the diocese.  When diocese was elevated to the status of Metropolis of San Francisco, Metropolitan Anthony was named the Greek Orthodox Metropolitan of San Francisco. The San Francisco County Transportation Authority (SFCTA) is a state chartered sub-regional transportation planning and programming agency for San Francisco County.  SFCTA is a separate legal entity from the San Francisco Municipal Transportation Agency, the Metropolitan Transportation Commission, and other transportation agencies in the San Francisco area, with its own administrative structure, policies, staff, budget, and with separate borrowing capacity.  The Authority Board consists of the eleven members of the San Francisco Board of Supervisors. Walter Maciel Gallery is an art gallery founded in 2005, located at 2642 S. La Cienega Boulevard, in the Culver City Art District in Los Angeles, California, United States.  Walter Maciel worked as a gallery director in San Francisco for fourteen years before he moved to Southern California and opened his own space.  Maciel has served on many boards and committees, including Southern Exposure, Headlands Center for the Arts, Hospitality House in San Francisco, and the San Francisco Art Dealers Association.  He has been on lecture panels at UCLA, the San Francisco Art Institute, California College of the Arts, UC Berkeley, Pacific Northwest College of Art, University of Missouri, Kansas City, and the Institute of Contemporary Art, San Jose. The Port of San Francisco is a semi-independent organization that oversees the port facilities at San Francisco, California, United States.  It is run by a five-member commission, appointed by the Mayor and approved by the Board of Supervisors.  The Port is responsible for managing the larger waterfront area that extends from the anchorage of the Golden Gate Bridge, along the Marina district, all the way around the north and east shores of the city of San Francisco including Fisherman's Wharf and the Embarcadero, and southward to the city line just beyond Candlestick Point.  In 1968 the State of California, via the California State Lands Commission for the State-operated San Francisco Port Authority (est. 1957), transferred its responsibilities for the Harbor of San Francisco waterfront to the City and County of San Francisco / San Francisco Harbor Commission through the Burton Act AB2649.  All eligible State port authority employees had the option to become employees of the City and County of San Francisco to maintain consistent operation of the Port of San Francisco. The Palace of Fine Arts in the Marina District of San Francisco, California, is a monumental structure originally constructed for the 1915 Panama-Pacific Exposition in order to exhibit works of art presented there.  One of only a few surviving structures from the Exposition, it is still situated on its original site.  It was rebuilt in 1965, and renovation of the lagoon, walkways, and a seismic retrofit were completed in early 2009. The San Francisco Public Defender's Office is an agency of the Government of San Francisco.  It provides legal assistance to individuals charged with violations of California state law by the San Francisco District Attorney's Office or the City Attorney of San Francisco.  Courts within its jurisdiction include the San Francisco Superior Court, the California Court of Appeal for the First District, and the California Supreme Court.
Answer: Marina District