Alexander M. Bing (1879-1959), with his brother Leo, founded the real estate firm of Bing and Bing, one of New York City’s most important real estate developers in the early 20th century. He was also a member of the Regional Planning Association of America; president and chief financer of the City Housing Corporation; co-founder of the Friends of Whitney Museum of American Art; and a member of the museum's board. He founded the City Housing Corporation, a limited-dividend construction company whose mission was to develop affordable residences for the middle class. He frequently called on charitable foundations and insurance companies to set aside a small portion of their resources to fund projects in Sunnyside, Queens. In Sunnyside Gardens, he effectively persuaded his fellow investors to set aside nearly three acres to create the largest private park in New York City, a playground for children and adults of the neighborhood. It became Sunnyside Park, which opened on May 18, 1926.