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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 21 owners or occupants of the main house or the cottage have been identified as important to the history of Pleasanton or California. Therefore, the building does not appear eligible for listing on the NRHP or CRHR under Criterion B/2. Criterion C/3 – Architecture and Construction Constructed in the 1880s, the main house at 493 St. John Street is an example of a late 19th century vernacular form residential development in Pleasanton. The main building embodies some characteristics of the style common during the post-railroad residential development in Pleasanton including its one-and-a-half-story, wood-frame, side gable massing with a front porch and modest classical detailing. The main house was possibly constructed by its earliest owner, Joseph Derendinger who is not considered a master architect or builder. The cottage to the north 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. It does not embody the distinctive characteristics of a type or common architectural style. The utilitarian accessory structures are of common construction and materials with no notable or special attributes, they do not possess high artistic value. Overall, the main house at 493 St. John Street appears eligible for listing on the NRHP and CRHR under Criterion C/3 as an example of a late 19th century vernacular form , post-railroad residential development in Pleasanton. The period of significance would be 1880s when the property was constructed. 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 493 St. John Street retains integrity of location since it has not been moved. The property retains its integrity of association and feeling because it has been used for residential purposes since its construction. The main house has received multiple additions and alterations over time. Even though the original massing and form is still discernable, the house no longer illustrates its late 19th century vernacular architecture. The main entrance was expanded, the window configuration was modified and a deck was added at the front façade, dormers were added to the east, and a horizontal addition expanded the building to the west. The building’s alterations and addition have significantly diminished integrity of design, materials, and workmanship. Integrity of setting has also been significantly compromised by construction of the adjacent hotel to the east and the residential development to the west. Overall, the property does not retain sufficient integrity to communicate its significance under Criteria A/1 and C/3 for its defined period of significance. 12. CONCLUSION Based on the above evaluation, the subject property at 475 St. John Street in Pleasanton does not appear individually eligible for the NRHP or CRHR as it was not found to possess sufficient integrity under criterion A/1 for its period of significance. Additionally, the property at 493 St. John Street in Pleasanton does not appear individually eligible for the NRHP or CRHR as it was not found to possess sufficient integrity under criteria A/1 and C/3 for its period of significance.