How much is too much?

[Zigner]

I was told that it was because landlords need to check for safety hazards, and to make sure everything is in working order. I heard that almost all apartments have at least annual inspections of the premises, so I didn't really think much of it.

You were told wrong. The law is clear about what is allowed.

Edited to add: Many states do allow for some sort of inspection such as this, but California does not.