Résumé

Partner, [Peter] Portois and Hillert, Architects, San Francisco, CA, 1877. In 1877, Portois and Hillert maintained their practice at 207 Sansome Street in San Francsico. (See San Francisco, California, City Directory, 1877, p. 465.)

Principal, Frederick Hillert, Architect, San Francisco, CA, c. 1883. In 1883, Hillert had an office at 620 Washington Street in San Francisco. (See the San Francisco, California, City Directory, 1883, p. 1106.)