I would look for reviews on Zillow, Google Maps, Yelp, Experiance.com.To look up their license history you can use nmlsconsumeraccess.com, licensed and registered Loan Officers have to report a 10 year employment history.

As the new property manager, you have the authority to enforce its terms.

Best thing is to call the housing authority that manages the voucher program in your city/county.

The guest house has STR rental history but the other two units would need to be based on projections. 

@Michael Daniel Ultimately, it's all about confirming what the housing authority pays.

Costs vary but can range from $1,000 – $3,000 per unit.Water/Sewer: This is more complex and may require approval from your local water authority.

You just need confirmation from your broker the amount you would receive from the commission (if they take a cut), if you're your own broker you can authorize that yourself. 

If your entity has several years of operating history and good and reliable financials, you may be able to find something. 

Google your "county" housing authority.

Typically an FHA lender will want to see 2 years of work history in the same field before they will approve you for a loan.