Me a pain? And I was thinking how unprofessional many of the responses were that seem intolerable and a pain in the derriere. But, thanks for your advice to use Google! I should have known I'd get the right answers without all the scufflaw in this thread.
Yes, I know I have a case (even more now since I found what I needed on Google) and you are wrong in your belief that I don't have a case! For instance, the 50.00 late fee is excessive (and therefore not valid) because it is so high it amounts to a penalty, pursuant to Harbor Island Holding, LLC vs. Kim (2003) and Orozco vs. Casimiro (2004) (late fee invalid because landlord failed to establish that damages for late payment of rent were extremely hard to fix). Being only 100.00 late on the complete rental payment certainly DIDN'T cause any extreme damages for the Landlord, so a 50.00 late fee was excessive pursuant to the above cited case!
Also, it is a big red flag that a landlord would increase one's rent by 50.00 and the others by only 25.00 at a time the landlord was giving frequent notice for the tenant to pay an unreasonable and excessive late fee. An excellent case for a retaliatory rental increase in violation of California Civil Code Section 1942.5, which allows punitive damages from 100.00 up to 2000.00 depending on the LL's conduct. If I prevail (which seems very likely), the LL cannot increase the rent for 180 days after I invoke my right not to pay an excessive late fee pursuant to the case cited.
I guess that would make many of the responses in this thread, WRONG. But thanks for playing anyway!