The 350 Spectrum Center Drive Parking Structure is an five level, poured in place, post-tensioned parking structure; one level at grade and four levels above grade.

The parking structure accommodates 1,628 parking stalls and includes 19 motor cycle spaces. The parking structure was designed on the axis of the 300 Spectrum Center Drive Office Tower, a landmark in the Spectrum Development.

The complexities of the site influenced the design of the structure. Working with PCF master-plan architects for The Irvine Company, the structure was placed on the horizontal diagonal through the site being centered on the office tower. The evolving design was perfectly symmetrical about this axis and afforded two identical primary entrances to the parking structure from the adjoining streets. The strong architectural vocabulary stemmed from poured in place concrete with deep reveals, the use of custom stainless steel scrim panels in the openings and the use of vertical aluminum louvers at the vehicular entrances. The vertical louver entry facade was developed by Wayne Banks as a new design element for the commercial parking structures in the Spectrum Office Complex and was subsequently incorporated in the 100, 200 and 400 structures as well as this 300 structure.