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Southwestern quadrant of Washington, D. C.

Southwest (SW or S. W.) is the southwestern quadrant of Washington, D. C., the capital of the United States, and is located south of the National Mall and west of South Capitol Street. It is the smallest quadrant of the city, and contains a small number of named neighborhoods and districts, including Bellevue, Southwest Federal Center, the Southwest Waterfront, Buzzard Point, and the military installation known as Joint Base Anacostia–Bolling.

The Blue, Orange, and Silver lines of the Washington Metro have the following stations in the Southwest Federal Center: Smithsonian, L'Enfant Plaza, and Federal Center SW. The Green line has a stop in the Southwest Federal Center at L'Enfant Plaza and in the Southwest Waterfront at Waterfront; additionally, the Navy Yard – Ballpark stop is one block outside the eastern boundary of the Southwest Waterfront neighborhood.

Southwest is part of Pierre L'Enfant's original city plans and includes some of the oldest buildings in the city, including the Wheat Row block of townhouses, built in 1793, and Fort McNair, which was established in 1791 as "the U. S. Arsenal at Greenleaf Point." Before 1847, much of the Virginia portion of the District of Columbia, including the town of Alexandria, was included in Southwest. After the Civil War, the Southwest Waterfront became a neighborhood for the poorer classes of Washingtonians. The neighborhood was divided in half by Fourth Street SW, then known as 41/2 Street; Scotch, Irish, German, and eastern European immigrants lived west of 41/2 Street, while freed blacks lived to the east. Each half was centered on religious establishments: St. Dominic's Catholic Church and Talmud Torah Congregation on the west, and Friendship Baptist Church on the east. (Also, each half of the neighborhood was the childhood home of a future American musical star — the first home of Al Jolson, whose father was the cantor of Talmud Torah Congregation, after his family emigrated from what is now Lithuania was on 41/2 Street, and Marvin Gaye was born in a tenement on First Street.) Waterfront developed into a quite contradictory area: it had a thriving commercial district with grocery stores, shops, a movie theater, as well as a few large and elaborate houses (mostly owned by wealthy blacks). However, most of the neighborhood was a very poor shantytown of tenements, shacks, and even tents. These places, some of them in the shadow of the Capitol Building, were frequent subjects of photographs highlighting the stark contrast.

In the 1950s, city planners working with the U. S. Congress decided that Southwest should undergo a significant urban renewal — in this case, meaning that the city would declare eminent domain over all land south of the National Mall and north of the Anacostia River (except Fort McNair); evict virtually all of its residents and businesses; destroy all streets, buildings, and landscapes; and start again from scratch. The seizure of the entire area, including well maintained properties, was upheld by the United States Supreme Court in Berman v. Parker. Justice William Douglas emphasized the squalor and segregation the area suffered, noting that the area was 98% black while 58% of dwellings had outside toilets. Only a few buildings were left intact, notably the Maine Avenue fish market, the Wheat Row townhouses, the Thomas Law House, and the St. Dominic's and Friendship churches. The Southeast/Southwest Freeway was constructed where F Street, SW, had once been. The rebuilt Southwest featured a large concentration of office and residential buildings in the brutalist style that was then popular. It was during this time that most of the Southwest Federal Center was built. The heart of the urban renewal of the Southwest Waterfront was Waterside Mall, a small shopping center and office complex, which housed satellite offices for the United States Environmental Protection Agency. The Arena Stage was built a block west of the Mall, and a number of hotels and restaurants were built on the riverfront to attract tourists. Southeastern University, a very small college that had been chartered in 1937, also established itself as an important institution in the area. Following a proposal by Chloethiel Woodard Smith and Louis Justement, renewal in Southwest marked one of the last great efforts of the late Modernist movement. Architect I. M. Pei developed the initial urban renewal plan and was responsible for the design of multiple buildings, including those comprising L’Enfant Plaza and two clusters of apartment buildings located on the north side of M St. SW, initially called Town Center Plaza). Various firms oversaw individual projects and many of these represent significant architectural contributions. Modernist Charles M. Goodman designed the River Park Mutual Homes complex. Likewise, Harry Weese designed the new building for Arena Stage and Marcel Breuer the Robert C. Weaver Federal Building, located at 451 Seventh Street, SW, to house the newly established U. S. Department of Housing and Urban Development, and the Hubert H. Humphrey Federal Building. The Tiber Island complex, which was designed as a replica of the adjacent Carollsburg Condominium and Carrollsburg Square, were designed by Keyes, Lethbridge & Condon, and won an American Institute of Architects award in 1966. However, urban renewal did not fully succeed in Southwest for many of the reasons that plagued other Modernist renewal efforts. Areas of the neighborhood remained run down, low income, and somewhat dangerous. This situation intensified in the 1980s and the 1990s, when Washington had among the lowest per capita incomes and highest crime rates in the nation. The Southwest urban renewal has been called "a case study of everything urban renewal got wrong about cities and people."

While many of the residential neighborhoods of Southwest remained both highly mixed race and mixed income, around 2003, the wave of new development occurring throughout D. C. reached Southwest including a number of apartment building renovations and condominium conversions. Nationals Park stadium, located on the east side of South Capitol Street and thus in Southeast, opened for the Washington Nationals Major League Baseball team in 2008, construction having cost more than $611 million. As part of the Capitol Riverfront revitalization efforts, high rise office buildings and condominiums have been constructed. Developers have created a waterfront greenspace The Yards, and a waterfront bike trail is planned. Public Housing projects continue to occupy the area between the Waterfront metro and the Nationals Park stadium. On April 16, 2010, the new Waterfront Safeway (including a sushi bar) Along Water Street, "The Wharf" includes restaurants, shopping, theaters, public piers, hotels, and high rise housing; the first phase opened in October 2017 (see Redevelopment of Southwest Waterfront) with phase two slated to deliver in early 2022. L'Enfant Plaza has also undergone a facelift, with new retail and hotels, as well as office renovations having been completed in the late 2010s. In April 2017, the National Capital Planning Commission (NCPC) approved plans for a staircase and ramp that will travel through a grassy slope in Benjamin Banneker Park to connect L'Enfant Plaza to the Southwest Waterfront and to add lighting and trees to the area. The NCPC and the National Park Service intended the project to be an interim improvement that could be in place for ten years while the area awaits redevelopment. Hoffman Madison Waterfront (the developer of "The Wharf") and the District of Columbia government agreed to invest $4 million in the project in an effort to improve neighborhood connectivity in the area. Construction began on the project in September 2017.