The growth of the community through the end of World War I is characterized by brick commercial buildings replacing the initial wood framed structures in the center of town and a steady, if modest, construction of housing within the blocks of the original townsite. The City of Fullerton incorporated in 1904, and while civic pride led to street improvements, no lasting public buildings were constructed in this era. Spadra Road (Harbor Boulevard) and Commonwealth Avenue witnessed the bulk of commercial development.

Dean Block, 1899-1901
Masonic Temple, 1901
Schumacher Building, 1905
Methodist Church, 1909
Crystal Ice House, 1910
Stedman Jewelers' Clock, 1910
Fullerton General Hospital, 1913