The Phoenix Union High School building is a Classical style building designed by Los Angeles architect Norman F. Marsh (Ref: Arizona Republic, 07/09/1911, page 17 via newspapers.com), and erected in 1911-1912. Renowned architect Royal Lescher of Phoenix attributed the building to Trost & Trost, according to documented notes at the Henry C. Trost Historical Organization website (https://www.henrytrost.org/buildings/phoenix-union-high-school/), however was either mistaken or misquoted.
Photograph courtesy of Wikipedia Commons
— Mark Stone
Construction Date: Jan 1, 1912
Address: 512 East Van Buren Street, Phoenix, AZ, USA