I posted an ad on craigslist once offering to pay a nominal amount for boondocking and got a surprising amount of responses for driveways, in front of houses, etc. Which makes sense, you're basically paying someone not to call the cops on you, which isn't that hard of a task. I might do that again if I were to visit LA, because it seems so much better to know you have permission to be somewhere, can sleep in, can run your generator, etc. Every urban stealth camper gets caught sooner or later; the vast majority of time they're just told to move on, I guess if you're ok with that then no need to pay.