The Palm Street Parking Structure is a five-level structure for the City of San Luis Obispo. The project involved the excavation and preservation of cultural artifacts as part of the construction. The structure is supported by a caisson foundation system that bears in the basement rock underlying the site, and is of cast-in-place concrete construction with suspended concrete decks at each level. The lower level is subterranean.

Earth Systems performed geotechnical engineering investigations and provided testing and inspection of soil, concrete, steel, and masonry.