What’s your budget? Would your family be able to cover the cost of a UC (around 35K/year) or would you be getting need-based aid to lower your net cost?
If your EFC is 35K or greater, you might want to add a few WUE reciprocity schools in nearby states to your list. A few examples:
The College of Architecture & Planning at the U of Utah has undergraduate programs in both Architectural Studies and Multidisciplinary Design. All of your alternate majors are available too (and likely easier to switch than at a UC or CSU.) If you score well on the SAT, you could get merit money and possibly acceptance to the Honors College. CA students can choose to either take the WUE discount, or take the path to residency and qualify for in-state tuition for the last three years.
Portland State would be a safety (and it’s rolling admissions, so you could apply right away and have an acceptance in your pocket while you wait for the CA schools) and has a really nice architecture program that does a lot of public benefit work in the city.
The UNLV School of Architecture offers undergrad programs in Architecture, Landscape Architecture, and Interior Architecture & Design.
Any of these schools would be cheaper than full-paying for a UC. They all have relatively high acceptance rates, but very high quality programs.
There’s also U of Oregon, which is a popular alternative to the UC system for CA students. (There’s a reason that “UC Eugene” t-shirts exist.) UofO has great architecture program (recognized especially for its sustainability work) and other well-regarded programs like product design and interior architecture. It’s a bit more costly OOS than the WUE schools, but does offer merit scholarships.
If you’re eligible for CalGrant aid and need to stick with the CA publics for affordability, then definitely add in-state safeties. As Gumbymom said, Cal Poly Pomona seems like the best-fit safety for you (Cal Poly SLO should be on your list for sure but is not a safety), with programs in architecture, landscape architecture, art, and art history all housed together in the College of Environmental Design. http://env.cpp.edu/env/undergraduate-degrees The only other CSU with an arch studies major is Fresno State - they just started it this year http://fresnostate.edu/engineering/cm/programs/specialmajor.html