the population; the top five nationalities were German, Irish, Swedish, Canadian, and English (or Welsh). African-Americans began moving into the area east of Halsted Street during the 1950s; they had been restricted to certain areas of the city, and expanded into others in search of better homes and jobs. The African-American proportion of the population increased from 12 to 75 percent between 1960 and 1970, a trend encouraged by blockbusting. Despite fears by many whites of decreasing property values, the economic status of the new residents differed little; Washington Heights remained middle-class. Interstate 57 was built through the area, opening in 1967 and forcing many residents to move. The only highway in the city without a nickname, a portion of it was named for the Tuskegee Airmen in 2012. 21st century Median household income declined somewhat during the 2000s; it was $2,000 less than the citywide median , and had been $6,000 above the citywide median in 1989. The site of the Chicago Bridge & Iron Company foundry became a development of single-family homes. Known as the Renaissance at Beverly Ridge, the original development plan for the site failed due to lack of funds during a housing-market crash after about 25 homes were built. An alderman's wife was responsible for selling the development and received money from tax increment financing (leading to suspicions of impropriety), and a new developer stepped to finish the project. This developer, who had close relations to alderman Carrie Austin, also failed to meet expectations, being unable to produce the promised 91 houses by June 2019 and leading to the city cutting off public funds to the project that December. The project continued during the early 2020s without incident, except on a single block that was beleaguered by problems in home construction and delays in contract closing. Attempts by residents on that block to fix the problems were fruitless until Austin's office was contacted. Given that the block expected to be renamed in honor of the new developer, a white man, and the neighborhood is majority block was also the source of controversy given the issues. Geography and neighborhoods Washington Heights is community area #73. It is on Chicago's far south side, from the Loop. Its northern border is the railroad tracks at 89th Street, and its southern border is West 107th Street. At several points its eastern border is Eggleston and Halsted, and its western