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 Jeremiah O. Mahony was born in Mitchelstown, County Cork, Ireland in 09/1835. Jeremiah was baptized on 09/13/1835, and, during the 19th century in Ireland, baptisms occurred very soon after birth or even on the same day.

He resided in San Francisco by at least 1860.

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.)

Jeremiah's son Richard J. Mahony and brother John Joseph Mahony, Jeremiah's brother, lived at 307 Van Ness Avenue according 1886 San Francisco voting records. (See Ancestry.com, Source Citation California State Library; Sacramento, California; Great Registers, 1886; Collection Number: 4-2A; CSL Roll Number: 62; FHL Roll Number: 977213, accessed 08/06/2025.)

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.)

He died at this residence (numbered in 1917 as "560 Page") on 12/05/1917 at the age of 82 years and 3 months and was buried at Holy Cross Catholic Cemetery in Colma, CA.

Parents

His mother was Elizabeth Doyle Mahony (born 02/03/1804 in Mitchelstown, County Cork, Ireland-d. 08/25/1877 in San Francisco, CA). She resided in San Francisco, CA, by at least 1864, dwelling at 425 Stevenson Street. (See San Francisco directory for the year commencing October, 1864, p. 260.)

Jeremiah's father was Richard Mahony, although little is currently known about him.

Spouse

He wed Catherine Cassidy (born 1837 in Ireland-d. 01/15/1911 in San Francisco, CA) in 1864 in County Donegal, Ireland. (See Ancestry.com, Source Information Ancestry.com. Ireland, Civil Registration Marriages Index, 1845-1958 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2011, accessed 08/06/2025.)

Children

He and Catherine had eight children: Richard John Mahony (born 1865 in San Francisco, CA-d. 03/08/1888 in San Francisco, CA); Mary R. "Mamie" Mahony Stafford (born 07/1867 in San Francisco, CA-d. 12/13/1892 in San Francisco, CA); John Joseph Mahony (born 01/1869 in San Francisco, CA-d. 03/04/1937 in San Francisco, CA); Francis Ignatius "Frank" Mahony (born 1870 in San Francisco, CA-d. 12/05/1927 in San Francisco, CA); Elizabeth Frances Mahony Corbett (born 12/03/1873 in San Francisco, CA-d. 02/13/1956 in San Francisco, CA); Ellen A. Mahony Lagan (born 07/10/1875 in San Francisco, CA-d. 10/25/1950 in San Francisco, CA); Joseph Jeremiah Mahony (born 10/10/1876 in San Francisco, CA-d. 01/06/1934 in San Francisco, CA); and Harold Joseph Mahony (born 01/17/1879 in San Francisco, CA-d. 10/05/1944 in San Francisco, CA).