Honestly, I don't think there's much value if all you're providing is a list of addresses of properties you believe to be vacant.Do you have any evidence someone you've given an addresses to has purchased a property on your list?

A survey, title search, and appraisal are required.We sell our loansYes, you can do a cash out refinance, but we will need to verify the expenses for all of those properties, the income they generate, and we will need to show evidence that you have reserves to cover PITI for those properties.

Here is your cheapest and most likely to succeed option:Outline for them that its a purely cosmetic problem, give them some evidence thats true, assure them you know its not their fault and they won't be billed, let them know you will fix the cosmetic/falling plaster etc. issue on a reasonable timetable.

As evidence of your experience as a landlord, you seem  to know your business.  

As someone who buys and tracks the bid results, I cannot not find any evidence of a property being sold for 50% off after being on the market for a few weeks(As kindly as I can put it)

You'll want to create a trail of supporting evidence.

With the current very misguided decisions by the Portland City Council (which were NOT, by the way, informed by evidence-based research from experts in housing policy and economics), we're headed down the exact same road as SF and NYC.  

Evidently the property managment company is having a great deal of trouble getting one of the tenants to sign.

The first mortgage lender (Ocwen) is asking for evidence of insurance and my agent supplied it but the borrowers are listed as additional insured not the insured.

He has a larger portfolio (as per OP and evidence of one other property).