Explain to her that you're concerned about other tenants following suit and ask her to sign a non-disclosure agreement, with the penalty being the rent being raised to $ 800. 00Or you can offer her a $ 50 discount for paying before the 1st of the month.

v=3nFj_k6R8G0What's your state/local government's laws on disclosure of it?

@Dan Bosak full disclosure to start, I own a submetering company but am also a RE investor and have done both RUBS and submetering prior to owning the company.

(Disclosure:  I've been doing this a while but I'm no title attorney - contact one for real answers to your questions!)

I don't buy CFDs so wouldn't know the answer, but would assume there are extra steps to keep in mind from a disclosure/legal perspective vs when you're reviewing a note secured by a deed of trust/mortgage?

Also what seller disclosures were supplied/required and did they address this?

Can't say for California, but in general I don't know of any restrictions placed on agents acting as investors other than those regarding disclosures and not taking the commission on transactions they are a principal in.

And they can't get any public sold data at all in non-disclosure states.Yes, of course investors will use their own agent, if they have one.

The obligations of Seller as provided in this paragraph shall be in addition to any Disclosure and Disclaimer Statement as required by Section 10-702, Real Property Article, Annotated Code of Maryland and any provision of any inspection contingency addendum made a part of this Contract (See Property Inspections Notice).That part that say the property will be delivered in substantially the same condition as existed on THE DATE OF CONTRACT ACCEPTANCE, was my saving grace about two months ago and should be the same for you. 

It should always be done through Escrow with a Title report and full disclosures.