I've scoured the internet trying to ID this rose. When we first moved into our property, we found it sulking in a shady corner and thought of tossing it out...that is until we saw it's huge beautiful blooms. We have since pulled it out and re-homed it to a sunny area and pampered it with plenty of TLC. I'm a newbie with roses and can't tell you much about it other than what's depicted in the pictures. However, I can say that the blooms are very large (easily over 6" wide) and last a VERY long time on the plant even through our intense SoCal summers (very thick petals). One minor downfall is that it has absolutely very little or no scent at all. I'd like to see this plant thrive someday and thought an ID might make it feel more special :).
I live in Brea, CA too. Unfortunatelly I do not know the name of your rose but I have an idea what maybe can help you.
There are on-line nurseries selling roses with good photo catalogs. Just search it on Google. Maybe you can find your rose or you can send them the picture to identify.
Hope this helped.
Hannah, I searched for a medium-red rose with blooms 6" or larger and found Legends. It has huge blooms and very little or no scent. It's fairly new, however, so if you moved in before 2009, when Weeks began selling it, it's the wrong guess.