In the late 19th century through the 1970s, the neighborhood was once home to large numbers of families of recent immigrant descent: mostly Irish, but also Germans, Italians, and others. After the 1950s, the combined effects of urban renewal, white flight, and institutional growth caused many to flee the neighborhood. In the early 1960s, the Boston Redevelopment Authority razed several homes in the Triangle District section of the neighborhood to make way for the Whitney Redevelopment Project, which are three high-rise towers along St. Alphonsus Street. They include Charlesbank Apartments (276-unit highrise that became a limited equity co-op), Back Bay Manor (270 units, now known as CityView at Longwood), and Franklin Square Apartments (formerly Back Bay Towers – 146 units, now known as The Longwood). This project was one of Boston's earliest redevelopment projects not funded by federal renewal monies. Eastward across St. Alphonsus Street is Mission Main, one of the nation's oldest public housing developments. The original thirty-eight 3-story brick structures built between 1938 and 1940 were demolished in the mid-1990s and replaced with 535 new apartments with a mix of subsidized and market-rate units.