You take on the role of digging deep into their pro forma and grading it like a teacher instead of writing the paper yourself. 

They are probably dilapidated houses in slow selling area with low ARV and high cost of repair that no investor in his right mind will buy.

Most of them are also not very deep, leaving many situations unregulated.

Be wary and seek advice about everything before you dive into the deep end.       

Along with the Thousands of vacant lots in the ubran cores of the Rust belt and deep south cities that have been blighted but the lots and infrastructure exits .. problem is can you get people to live there ? 

For example my simple spruce up would be, renno bathroom, and kitchen, paint, and redo carpet upstairs.But if i think real deep into what I could do to make it a STUNNER then I think, knock down walls, create more open/broken floor plan, add central air, possibly do an addition to add a 3rd bedroom and second bath.So when you could do ANYTHING .. how do you draw the line of what you should do?

Now I'm curious. things were slowing down a lot in my world..

One thing I learned is slow and steady wins the race.

Other ways people have higher cash flow is higher down payment (>20%, which isn't a good option) or they were lucky and got lower interest rates.Long term rentals are more of a slow and steady income. 

I have a rental in a C area that does extremely well and others in A locations that are slow.