I would do some research on the web as various banks have different ways of sharing available properties.

Is this an actual disclosure that is available freely for me to give to my tenants, or do I just say "Go to the web to better understand the landlord-tenant code?"

You should be able to check a properties specific tax history on both the county assessors web page, as well as on zillow. 

BTW, servicers have always been required to verify loan conditions including ownership, but the above link to the Servicing Guide Bulletin was just published on August 16, 2017 (two weeks ago) so don't bellyache if your loan is called;) 

The leasing or rental of units in those two family homes in which the owner occupies one apartment of that home as his residence is not covered by this law unless: The homeseeker or renter is a recipient of public assistance or housing subsidy; or,The leasing or rental process utilized the services of a person or organization whose business includes engaging in residental real estate related transactions; or,The availability of such unit is made known by making, printing, publishing, or causing to be made printed or published any notice, statement, or advertisement with respect to the rental of such a unit that indicates any preference limitation, exclusion or discrimination based upon race, color, religion, sex, sexual orientation, national origin, ancestry, children, marital status, handicap, veteran status, or public assistance or housing subsidy recipiency.The following text is effective 07/01/93  

In Jan 2007, I came accross https://web.archive.org/web/20070216134932/http://... that explained about "mortgage reits" traded on stock exchange, in Jan 2007.

Confused on them - and there are conflicting articles on the web on both. 

So, in a hot market the seller will look first for a cash buyer with no financing contingency, second for a buyer with approved financing from a conventional lender, third from a buyer who has been qualified by a mortgage broker, and last, i at all from a buyer with a POF from a hard money lender.Of course not all sellers, or the brokers representing them are sophisticated, so if you make enough offers you WILL get some sellers that accept you POF letter.Just to show you how meaningless these POF letters from hard money lenders really are, about 8 years ago a number of lenders published a generic POF on their websites, and told potential borrowers to download the letters, fill in the blanks, and they had an instant proof of funds.  

However, this year one unit isn't renting and isn't getting much inquiry from the web ads. 

some ov this iz sepelled wrong Just tried it this in two different web browsers.