Male, born 1846-02-05, died 1934-05-31

Associated with the firms network

Costerisan and Forsyth, Architects; Costerisan and Merithew, Architects; Kavanaugh and Costerisan, Associated Architects

Professional History


Costerisan served in the military during the Civil War, being discharged on 09/27/1865. (See, Source Information U.S., Veterans Administration Master Index, 1917-1940 [database on-line]. Lehi, UT. USA: Operations, Inc., 2019, accessed 07/26/2021.)

Partner, Costerisan and Merithew, Architects, Los Angeles, CA, c. 1887.

Principal, George F. Costerisan, Architect, Los Angeles, CA, c. 1888. A notice in the Los Angeles Herald of 01/31/1888 stated: "Geo. F. Costerisan, the well known architect, formally of Costerisan and Merithew, has opened an office at No. 11 West First street, where he will be pleased to have his old friends and patrons call on him; and anyone who wishes to favor him with their patronage." (See "Costerisan Notice," Los Angeles Herald, vol. 29, no. 121, 01/31/1888, p. 3.)

Partner, Costerisan and Forsyth, Architects, Los Angeles, CA, c. 1888. Costerisan and Forsyth had their office at 23 South Spring Street in 1888. (SeeLos Angeles, California, City Directory, 1888, p. 768.)

Associate, Kavanaugh and Costerisan, Associated Architects, Los Angeles, CA, c. 1913.



Costerisan died in Los Angeles County at age 88.


His father was Phelix Costerisan, Sr., (born c. 1816 in France), his mother, Rachel M. Sebring (born c. 1816 in PA).

His siblings included: Sarah Costerisan (born c. 1840 in PA), Godfrey Costerisan (born c. 1841 in PA), Rebecca Costerisan (born c. 1842 in PA), Jonathan Costerisan (born c. 1847 in PA), and Henry Costerisan (born c. 1849 in PA).

Biographical Notes

His given first name was "Phelix," named for his father.

PCAD id: 3050