The other issue with 'second set of eyes' for someone to look over your work is that the person doing that may be required to 'sign' as a preparer which can then put the firm at more risk.

The issue comes with test 2.

I have had them cancel penalty free with proof of sale/under contract, or an imminent maintenance issue.

How do I research to see if there are any liens, or title issues with the property?

If not done properly, this may be an issue down the road if the county gets involved for any reason whatsoever. 

@Artur A. common issues unfortunately.

The issue we are having is the property doesn't "legally" cash flow enough to qualify for DSCR, and, for seller finance, they have unrealistic terms.

We need to learn how to negotiate and to not get out emotions involve in the deal.

It's frustrating when tenants don't even bother reporting such issues, especially when they're not paying for utilities. 

You can have two houses that are identical according to the data on paper/ virtually, but millions of dollars apart in value for infinite reasons that you just can't know without being there (level of finishes, condition, smell, same builder or different, how the property will show to potential buyers, micro-location (same sub-division or different one across the street, one has awesome views while the other doesn't, one could be on a lake while the other isn't, one could be next to gas station or on a busy street, near train tracks, a smelly factory, backing to commercial or high density multifamily, one could have settling issues with the foundation because of expansive soils while the other doesn't etc. etc. etc.).