Henry Dalton received a US patent for Rancho Azusa in 1876. When he died in 1884, Dalton had lost most of his property and was living in poverty. In 1885 Slauson acquired Henry Dalton's Rancho Azusa de Dalton, organized the Azusa Land and Water Company, and developed the town of Azusa. Rancho Azusa, with the exception of some , was sold to John Dustin Bicknell, I. W. Hellman and others. The lots in the town of Azusa were put on the market in 1887, and the following year the Santa Fe Railroad was completed. On December 29, 1898, Azusa was incorporated as a city of the sixth class. Henry Dalton was born in London on October 8, 1804 to Winnall Thomas Dalton and Ann Woolfe. He had 9 brothers & sisters.