Question: What year was the Johnson house built? 

full_context: Document 1: Bachman–Wilson House: The Bachman Wilson House, built in and originally located in Millstone, in Somerset County, New Jersey, United States, was originally designed by Frank Lloyd Wright in 1954 for Abraham Wilson and his first wife, Gloria Bachman. Ms. Bachman's brother, Marvin, had studied with Wright at Taliesin West, his home and studio in Scottsdale, Arizona. In 2014 the house was acquired by the Crystal Bridges Museum of American Art in Bentonville, Arkansas and has been relocated in its entirety to the museum's campus.
Document 2: Julian Street, Jr. residence: The Julian Street, Jr. residence is an early Modernist fieldstone house in Briarcliff Manor, New York. The house was designed by the New York architect Wallace K. Harrison for Julian Street, Jr. and his wife, Narcissa, in 1938. Harrison, primarily known as a monuments architect through his works in New York City like Rockefeller Center and the United Nations complex, also designed a few private residences. Harrison designed and built the Julian Street, Jr. residence at 710 Long Hill Road West as an unconventional experiment in the early Modernist architecture that was just being introduced in America during the late 1930s.
Document 3: Wingspread: Wingspread, also known as the Herbert F. Johnson House, is a historic house at 33 East Four Mile Road in Wind Point, Wisconsin. It was built in 1938–39 to a design by Frank Lloyd Wright for Herbert Fisk Johnson Jr., then the president of S.C. Johnson, and was considered by Wright to be one of his most elaborate and expensive house designs to date. The property is now a conference center operated by The Johnson Foundation. It was designated a National Historic Landmark in 1989.
Document 4: Samuel and Minette Kuhn House: The Samuel and Minette Kuhn House is a historic house at 420 Griffins Island Road in Wellfleet, Massachusetts. It is one of a modest number of surviving houses in Wellfleet that combine elements of Modern architecture with traditional Cape Cod architecture. The single story wood frame house was built in 1960 to a design by Nathaniel Saltonstall, founder of Boston's Institute of Contemporary Art. The Kuhns were exposed to Saltonstall's work when they stayed at The Colony, another property he designed that is located nearby on Griffins Island. The house incorporates Bauhaus design principles of simplicity and economy, and is based around the idea of square modules, which are repeated on small, medium and large scales, affecting the room shapes and sizes, windows, and interior furnishings and decorations. The house, which is within the bounds of the Cape Cod National Seashore, was sold by the Kuhns to the National Park Service in 1973, but they retained right of occupancy for 25 years. The Park Service began using the property for employee housing in 2003.
Document 5: Booth House (Bedford, New York): The Booth House is a single-story modernist house in Bedford, New York. Built in 1946, the house was American architect Philip Johnson's first residential commission, and is a stylistic precursor to Johnson's better-known 1949 Glass House in New Canaan, Connecticut.
Document 6: Robert and Rae Levin House: In 1949, Robert and Rae Levin worked with Frank Lloyd Wright to build a house in Kalamazoo, Michigan. It was the first house to be built in Parkwyn Village, a planned community of Usonian houses. Usonia is a word used by Frank Lloyd Wright and refers to the residents of the United States Of North America.
Document 7: Farnsworth House: The Farnsworth House was designed and constructed by Ludwig Mies van der Rohe between 1945 and 1951. It is a one-room weekend retreat in a once-rural setting, located 55 miles (89 km) southwest of Chicago's downtown on a 60-acre (24 ha) estate site, adjoining the Fox River, south of the city of Plano, Illinois. The steel and glass house was commissioned by Dr. Edith Farnsworth, a prominent Chicago nephrologist, as a place where she could engage in her hobbies — playing the violin, translating poetry, and enjoying nature. Mies created a 1,500-square-foot (140 m) house that is widely recognized as an iconic masterpiece of International Style of architecture. The home was designated a National Historic Landmark in 2006, after joining the National Register of Historic Places in 2004. The house is currently owned and operated as a historic house museum by the historic preservation group, National Trust for Historic Preservation.
Document 8: Glass House: The Glass House or Johnson house, is a historic house museum on Ponus Ridge Road in New Canaan, Connecticut. Built in 1949, it was designed by Philip Johnson as his own residence, and "universally viewed as having been derived from" the Farnsworth House design, according to Alice T. Friedman. Johnson curated an exhibit of Mies van der Rohe work at the Museum of Modern Art in 1947, featuring a model of the glass Farnsworth House. It was an important and influential project for Johnson and for modern architecture. The building is an essay in minimal structure, geometry, proportion, and the effects of transparency and reflection. The estate includes other buildings designed by Johnson that span his career. It was designated a National Historic Landmark in 1997. It is now owned by the National Trust for Historic Preservation, and is open to the public for guided tours, which begin at a visitors center at 199 Elm Street in New Canaan.
Document 9: Botherum: Botherum was built for Madison C. Johnson in 1850 or 1851 (sources vary) by John McMurtry, a well-known architect and builder based in Lexington. The house was intended, in part, as a shrine to Johnson's late wife Sally Ann, a sister of Cassius Marcellus Clay who died giving birth in 1828.
Document 10: Douglas and Charlotte Grant House: The Douglas and Charlotte Grant House is a historic building located in Marion, Iowa, United States. Located on 40 acres of land, this Frank Lloyd Wright designed Usonian-style dwelling was constructed from 1949 to 1951, with some construction continuing to about 1960. This is one of the first houses in Iowa built in this style, having been completed a year after the Lowell E. Walter House located near Quasqueton. The two houses are very similar in style. The characteristics that mark this as a Wright-designed house include: the house integrated into the site and opened to the outdoors; the use of window walls and horizontal bands of windows; natural lighting and ventilation; use of natural materials; a horizontal emphasis in mass and proportion; a car port in place of a garage; slab-on-grade construction with radiant heat system embedded in the slab; a flat roof; an open-plan interior; varied ceiling heights on the interior; built-in
Document 11: Ruth and Robert Hatch Jr. House: The Ruth and Robert Hatch Jr. House is a historic house at 309 Bound Brook Way in Wellfleet, Massachusetts. It is one of a modest number of surviving houses in Wellfleet that combine elements of Modern architecture with traditional Cape Cod architecture. This single story wood frame house was built in 1961 on Bound Brook Island to a design by local architect Jack Hall. Extremely rustic in appearance, its exterior is sheathed in vertical boards and its windows have working shutters but no glass, resulting in a sharply vertical appearance. The structure consists of three rectangular sections of different sizes that are based on modular 7' by 7' squares; the main public living space is 35' by 49', the master bedroom is 7' by 21', and the guest bedrooms are in a block that is 7' by 14' (enlarged from the original 7' by 7' in 1978). The house, which is within the bounds of the Cape Cod National Seashore, was sold by the Hatches to the National Park Service, but retain occupancy rights.
Document 12: Wallace E. Pratt House: The Wallace E. Pratt House, also known as Ship On The Desert (sometimes hyphenated), was the residence of Wallace Pratt in what is now Guadalupe Mountains National Park in far western Texas. Pratt, a petroleum geologist for the Humble Oil & Refining Company, had previously built the Wallace Pratt Lodge in McKittrick Canyon a couple of miles to the north in the Guadalupe Mountains. Finding the cabin site to be remote and prone to being cut off by flooding, Pratt started construction of a new, modern residence on the east slope of the mountains. Work on the residence started in 1941. The house was designed by Long Island architect Newton Bevin, who lived for a time at the site with his wife, and built by contractor Ed Birdsall. Work was stopped by World War II, but resumed in 1945 and was completed the same year. In contrast to Pratt's rustic canyon cabin, the house, which Pratt named the Ship On The Desert, is an International Style house with horizontal lines and extensive glazing. Only 16 ft wide and 110 ft long, the house provides broad views to the east over the plans and the west to the mountains. The majority of the house is on a single level, with a "captain's bridge" over the dining room giving access to a rooftop terrace. A detached garage contained a guest bedroom. Apart from glass, the predominant material was local limestone in several shades.
Document 13: Philip Johnson: Philip Cortelyou Johnson (July 8, 1906 – January 25, 2005) was an American architect, best known for his works of Modern architecture, including the Glass House in New Canaan, Connecticut, and his works of postmodern architecture, particularly 550 Madison Avenue which was designed for AT&T, and 190 South La Salle Street in Chicago. In 1978 he was awarded an American Institute of Architects Gold Medal and in 1979 the first Pritzker Architecture Prize.
Document 14: Jim Thompson House: The Jim Thompson House is a museum in central Bangkok, Thailand, housing the art collection of American businessman and architect Jim Thompson, the museum designer and former owner. Built in 1959, the museum spans one rectangular "rai" of land (approximately half an acre or 2023.43 meters). It is one of the most popular tourist destinations in Thailand; sporting vibrant jungle foliage in the heart of the city.
Document 15: Eddie's House: Eddie's House was a doghouse designed by Frank Lloyd Wright for the Berger family of San Anselmo, California, to be used by their dog Eddie. Wright designed Eddie's House to be in keeping with the family's home, known as the Robert Berger House, which he had previously designed. The plans for the doghouse were completed by Wright in 1957, and the four square foot triangular house was built in 1963. In 1973 Eddie's House was removed and thrown away, but in 2010 Jim and Eric Berger, sons of Robert Berger, rebuilt Eddie's House from the original plans for a segment in "Romanza", a documentary film by Michael Miner about Frank Lloyd Wright's architectural works in California. The doghouse remains the smallest structure Frank Lloyd Wright ever designed.
ground_truth: 1946