She wanted her money back and if I didn't comply she was going to involve her attorney and the 'authorities' (is she talking about the MH police?!).

As for the paperwork, you can find generic promissory notes online ; however, I would make sure to consult with an attorney prior to selling any mobile homes on notes to make sure that you comply with the Safe Act. 

And the only thing that sometimes hurt me in D. was that he is soooooooooo honest and he wouldn't do anything which doesn't comply to his moral values, His honor is just huge, and I certainly respect it a lot.I live in so called "depressed" area in CA, and I had cash on top of everything else (credit score, job, etc.) and I had NIGHTMARES for a year I was going through the real estate process that D. could leave me and I'd have to again deal with slow, lazy and unprofessional real estate agents.K. is D.'

Is there a way to remotely manage a property in those markets and still comply with those requirements?

Even if your son is planning to show/lease/manage them for you...you'll want him to have a local contact to make sure he's complying with city regulations and/or WV regulations!

Then you'd need to pursue a court action to compel them to comply either through eviction for the lease violation (failure to provide access), or a specific court order awarding access which then the police will enforce since they have a court order.

I would think they in theory would encourage this but know that the wealthy generally own the RE in SF and would likely lobby against the "forcing" of landlords to comply to policies increasing density in their properties.2) For what @Bruce Woodruff mentions above.

Spell out exactly what they have to do, when they have to do it, how you will verify, and the consequence of failing to comply.

Account Closed that is kind of unreasonable to call the seller shady after they ask you to comply with the contract you signed.

If you have complied with that law then don't bother texting go straight to the legal notice for your state of pay or quit.