Not much in terms of online reviews as far as I can tell

If you have extra cash at the end of the month, then do double up payments on the mortgages so the principle is reduced and this will increase your heloc room.

Here is a newly created resource on BiggerPockets, which touches out cost segregation, accelerated depreciation, bonus depreciation, depreciation recapture, Real Estate Professional Status (REPS), STR Loophole / STR Strategy, example properties, and more. 

Out of curiosity would anyone be willing to share any experience with non-paying renters who've vacated the property prematurely?

An investor is going to want to have a specific date they can get their money out of the deal. 

Are there any options out there that won't tear away the margin on flips?

You pay for the basement reno out of pocket and cash out immediately...instead of waiting for 6-12 months

We eat the first one, thy get a picture of all the glory the plumber pulled out and the second time they get billed.

What off-market really means is that the seller refuses to sign an exclusive listing agreement with an agent but tells the agent if they bring them a buyer, they'll payout a commission.

Because of the crime?