Résumé

Partner, Mahony Brothers, Building Contractors, San Francisco, CA, c. 1881-1906. The firm won the contract for the 10-story Crocker Building at 600 Market Street in 1890. The San Francisco Call and Post newspaper said in 04/1890: “The contract for the erection of the ten-story Crocker building on the Post and Market street gore has been let to Mahoney Bros., who will begin work at once. The cost of the building when completed, it is estimated, will be considerably over $1,000,000.” (See “The Crocker Building,” San Francisco Call and Post, 04/09/1890, p. 4.)

Relocation

The carpenter and building contractor John Joseph Mahony was born in Mitchestown, County Cork, Ireland in 05/1842. He followed his brother Jeremiah, seven years older, to the US. Jeremiah was naturalized in San Francisco’s 4th District Court on 10/01/1864, while his brother John was naturalized on 11/02/1864, in the same court. (See Ancestry.com, Source Citation California State Library; Sacramento, California; Great Registers, 1882; Collection Number: 4-2A; CSL Roll Number: 55; FHL Roll Number: 977205, accessed 08/05/2025.)

In 1882, San Francisco voter records indicated that Jeremiah O. Mahony and his brother John Joseph Mahony resided together at 425 Stevenson Street. (See Ancestry.com, Source Citation California State Library; Sacramento, California; Great Registers, 1882; Collection Number: 4-2A; CSL Roll Number: 55; FHL Roll Number: 977205, accessed 08/05/2025.)

The brothers continued to live together in 1890, dwelling at 540 Page Street in what is now San Francisco's Lower Haight neighborhood. (See Langley’s San Francisco Directory for the Year Commencing May 1890, p. 860.)

In 1900, John J. and Mary Mahony resided at 1150 Fulton Street with their four children, and two servants, Lizzie Sullivan (born c. 1882) and a man named Harry with no surname listed (born c. 1876 in Japan). (See Ancestry.com, Source Citation Year: 1900; Census Place: San Francisco, San Francisco, California; Roll: 104; Page: 12; Enumeration District: 0175, accessed 08/06/2025.)

Children

He and Mary had five children: Nellie Mahony Rossi (born 04/04/1890 in San Francisco, CA-d. 09/12/1968 in San Francisco, CA); Mary Mahony; Jeremiah Mahony; amd Richard Mahony.