Intended to be permanent were the Cabrillo Bridge, the domed-and-towered California State Building and the low-lying Fine Arts Building; the latter are now part of the National Register of Historic Places-listed California Quadrangle. The Botanical Building would protect heat-loving plants, while the Spreckels Organ Pavilion would assist open-air concerts in its auditorium. The Botanical Building was completed for $53,400 ($ today). The Cabrillo Bridge was built to span the canyon, and the appearance of its long horizontal stretch ending in a great upright pile of fantasy buildings would be the crux of the whole composition. This design composition and the bridge were designed to remain as a permanent focal point of the city, while many of the exhibit buildings were intended to be temporary. Upon arrival, the focus of the fair was the Plaza de California (California Quadrangle), an arcaded enclosure often containing Spanish dancers and singers, where both the approach bridge and El Prado terminate. The California State Building and the Fine Arts Building framed the plaza, which was surrounded on three sides by exhibition halls set behind an arcade on the lower story. Those three sides, following the heavy massiveness and crude simplicity of the California mission adobe style, were without ornamentation. This contrasted with the front facade of the California State Building, 'wild' with Churrigueresque complex lines of mouldings and dense ornamentation. Next to the frontispiece, at one corner of the dome, rose the tower of the California Building, which was echoed in the less prominent turrets of the Southern California counties and the Science and Education buildings. The style of the frontispiece was repeated around the fair. Temporary buildings The architecture of the "temporary buildings" was recognized, as Goodhue described, as "being essentially of the fabric of a dream—not to endure but to produce a merely temporary effect. It should provide, after the fashion that stage scenery provides—illusion rather than reality." The "temporary buildings" were formally and informally set on either side of the wide, tree-lined central avenue. El Prado extended along the axis of the bridge and was lined with trees and streetlights, with the front of most buildings lined with covered arcades or portales. The Prado was intended to become the central path of a great and formally designed public garden. The fair's pathways, pools, and watercourses were supposed to remain while the cleared building sites would become garden. Goodhue emphasized that "only by