The problem with Diamond Plaza (Rowland Heights) is that the place has no spill-over parking nearby. You have 1 entrance/exit and the whole place is fenced off. You couldn't park in the neighborhood streets or at another shopping center across the street. Sometimes I get lucky parking in the back, or underground.
However, the dim sum restaurant there on the 2nd floor has excellent late-night deals after 9pm. And the tea ren place has some girls waiting for their drinks that you can chat up, if you got the charisma (or if you look like Bae Yong Joon from Winter Sonata).
I have a big, tall, Irish trans-gender friend who speaks some Chinese (she used to teach English in China). I take her to Diamond Plaza once in a while for a late night snack and catch up. We get weird looks from the patrons, but the waiters are quite de-sensitized from years of encountering unusual patrons.