By 1950, The African-American population was around 77% in Oakland; while other ethnic groups moved from the neighborhood. Oakland's population decreased by two-thirds over a 15–year period, from 1962 to 1977 which resulted in the neighborhood becoming nearly 100% African–American. Housing Due to the increase of Irish immigrants in the area, numerous single-family houses and apartments were constructed to accommodate them. Part of the Oakland area was annexed to Chicago in 1863; the rest in 1889. Between 1939 and 1941, the then–newly formed Chicago Housing Authority constructed the Ida B. Wells Homes housing project. Bordered by 37th-39th Streets and Cottage Grove Avenue and Martin Luther King Drive (then South Park Avenue), It was the site of Aldine Square town homes, which by 1935 were old and dilapidated. The housing project increased the African–American population in the area and Oakland became a part of the Bronzeville neighborhood. Due to the rapid population growth in the area, The housing authority constructed more public housing. The sites were the Clarence Darrow Homes in 1961, located at the north end of Oakland and Lake Michigan High-Rises, which consisted of six-buildings bordered between 39th and 43rd Streets and Oakenwald and Lake Park Avenues during 1962 and 1963. The last public housing high-rises to be built in the area were the Madden Park Homes in 1970. Economic decline Oakland experienced a drastic declining economic base between 1961 and 1965 due to the poverty that fell upon the area. The housing projects in the area became crime-infested and controlled by street gangs. Street gangs such as the Disciples, Vice Lords and Black P. Stones were rampant and controlled the area by 1968. The notorious Black P. Stone Nation (later renamed El Rukn) had the largest presence in the area. The Oakland Theatre, which operated from 1907 until 1973, located at 3947 South Drexel Avenue, in the heart of Oakland became the Black P. Stone street gangs' headquarters in 1976. The headquarters, which was named "The Fort" and "Grand El Rukn Temple" was a constant target for police raids, until eventually being taken after a raid by the FBI in 1990. The building was demolished a few years later. By 1979, The city of Chicago had demolished dilapidated buildings, in return leaving vacant lots scattered throughout the area. The Oakland neighborhoods' average income fell below the poverty level as middle-class residents moved from the area, It was one