DTI had become my hurdle, making regular plain vanilla mortgages difficult.

$1,250,000 all in is often difficult these days!

Concessions are also somewhat difficult to comprehend, since real estate can be a game of telephone, sometimes the transaction is just better off, without attempting to get four parties to understand the numbers. 

If I were to refinance (which would be impossible as you stated), it would be even more difficult to cash flow. 

Re-habing a house from scratch is very difficult, we are doing it by ourselves which is even more difficult but enjoying the process and learning.

@Sam Booth - I agree that planning out your CapEx can be difficult. 

I find it extremely difficult to give letter grades to an area.

I have a difficult tenant with section8 houston housing.

Since REP status is difficult for full-time doctors to achieve, this approach allows them to take advantage of the tax benefits (e.g., cost segregation studies and bonus depreciation) without qualifying as real estate professionals.

As it get's more difficult to buy for people, it's a shift, making more tenants.