In 1935, Abbott was hired by the Federal Art Project (FAP) as a project supervisor for her "Changing New York" project. While she continued to take photographs of the city, she hired assistants to help her in the field and in the office. This arrangement allowed Abbott to devote all her time to producing, printing, and exhibiting her photographs. By the time she resigned from the FAP in 1939, she had produced 305 photographs that were then deposited at the Museum of the City of New York.
In 1935, Abbott moved into a Greenwich Village loft with art critic Elizabeth McCausland, with whom she lived until McCausland's death in 1965. McCausland was an ardent supporter of Abbott, writing several articles for the Springfield Daily Republican, as well as for Trend and New Masses (the latter under the pseudonym Elizabeth Noble). In addition, McCausland contributed the captions for Changing New York which was published in 1939. In 1949, her photography book Greenwich Village Today and Yesterday was published by Harper & Brothers.