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Project Name: 475-493 St. John St. HRE Pleasanton Historic Resources Evaluation - DRAFT Project No: HP0932.2101.00 February 25, 2021 treanorhl.com 20 Criterion C/3 – Architecture and Construction The main building was originally constructed in the 1880s; however, it does not retain most of its original details or style having been greatly altered over time. It is of common construction and materials with no notable or special attributes, and the structure does not possess high artistic value. No architect, designer or builder has been identified. The main building does not embody the distinctive characteristics of a type or architectural style common during post-railroad residential development in Pleasanton. The utilitarian accessory structures are of common construction and materials with no notable or special attributes, and they do not possess high artistic value. Overall, the property does not appear eligible for listing on the NRHP or CRHR under Criterion C/3. Criterion D/4 – Information Potential Archival research provided no indication that the subject property has the potential to yield information important to the prehistory or history of the local area, California, or the nation. The subject property does not appear eligible for listing on the NRHP or CRHR under Criterion D/4. Integrity The property at 475 St. John Street retains integrity of location since it has not been moved. The property does not retain its integrity of association and feeling since it has not been used as a single-family house since at least the 1970s. The building has received multiple additions and alterations over time and its original form and massing is no longer evident. The building does not retain its scale and does not illustrate the original late 19th century vernacular architecture. The property does not retain sufficient integrity of design, materials, and workmanship. Finally, the integrity of setting has been significantly compromised by the construction of the adjacent hotel to the east and the residential development to the west. Overall, the property at 475 St. John Street does not retain sufficient integrity to communicate its significance under Criterion A/1 for its defined period of significance. 493 St. John Street (APN 94-114-8) Criterion A/1 – Association with significant events The main house at 493 St. John Street was constructed in the 1880s during the post-railroad subdivision and development period in Pleasanton that took place from ca. 1869 to 1900. The area remained sparsely populated in the 1850s, but the arrival of the railroad increased the population as subdivisions along the axes of Main Street and the railroad formed the core of the Pleasanton town site in the 1860s. The arrival of the Central Pacific Railroad sparked a commercial, agricultural, and residential boom in Pleasanton. The subject property is associated with early residential development patterns in Pleasanton, specifically with the post-railroad subdivision and development period as one of the earlier residences in downtown. Therefore, the property appears eligible for listing on the NRHP or CRHR under Criterion A/1. The period of significance would be 1880s, when the main house was constructed. The cottage to the north was constructed between 1929 and 1943, replacing an earlier dwelling on site. Neither the cottage nor the more recent accessory structures are associated with significant events of development patterns. Criterion B/2 – Persons No persons of known historical significance appear to have been associated with the subject property. The Trimingham family lived at the 493 St. John Street property from at least 1930 to 1965. Earl Trimingham was the mayor and city councilman in Pleasanton from 1937 to 1950. Even though Trimingham was active in administration of Pleasanton during the early to mid-20th century, research has not revealed any information about Trimingham’s contributions being historically important in the city’s development. None of the other