Development of public housing in the city began in the 1930s when the United States rule over the Philippines. Americans have to deal with the problem of sanitation and concentration of settlers around business areas. Business codes and sanitation laws were implemented in the 1930s. During this period until the 1950s, new communities were opened for relocation. Among these were Projects 1–8 in Diliman, Quezon City and the Vitas tenement houses in Tondo. The government implemented the Public Housing Policy in 1947 that established the People's Homesite and Housing Corporation (PHHC). A few years later, it put up the Slum Clearance Committee which, with the help of the PHHC, relocated thousands of families from Tondo and Quezon City to Sapang Palay in San Jose del Monte, Bulacan in the 1960s.