While these vendors are typically reputable and skilled, you might not get the best price compared to shopping around directly.

What the gurus don't tell you is that they are comparing market rents to the GROSS amount of S8 rent on a voucher which INCLUDES LANDORD PAID UTILITIES!

Key Factors for a Good Seller-Financed DealCash Flow: Rental income should exceed monthly payments (PITI) by at least 1.25–1.5x.Purchase Price: Compare to ARV and market value for fair pricing and equity potential.Interest Rate: Aim for competitive rates; higher rates must still allow positive cash flow.Amortization/Balloon Terms: Favor longer amortization and align balloon payments with your exit strategy.Down Payment: Lower upfront costs reduce risk but should meet the seller's expectations.Flexibility: Seek no prepayment penalties and fair late-payment clauses.Property Condition: Ensure the property’s condition matches terms through inspections.Seller Motivation: Assess the seller’s willingness to negotiate favorable terms.Exit Strategy: Have a clear plan for refinancing or payoff at term end.Portfolio Fit: Ensure the deal aligns with your financial goals and risk tolerance.Vetting multiple deals and consulting professionals is crucial to making sound decisions.

Is there anything specific I should focus on during the due diligence process, particularly regarding title and document inspection, compared to a traditional sale?

For example how many units in your comparable are classic vs Platinum. 

Unfortunately due to the property values, the cash proceeds will be disproportionately impacted by transactional costs associated with the financing (doc prep, appraisal, recording etc.) which will also hurt the available proceeds compared to the same LTV financing of higher value real estate that can better absorb these transactional costs. 

Since I'm based in Tampa, I don't look outside and compare markets. 

Duplexes cash flow better, have less risk, AND EASIER TO MANAGE compared to a SFH.  

Platforms like Zillow or Redfin can give you insight into comparable properties, and PropStream is great for deeper analysis like liens or ownership history. 

I was comparing large cities to other large cities.