This will cost you money on the back end.

Completely eliminated noise complaints from the lower level and reduced utility costs.

Am I more likely to be able to add $50k or $100k of value above cost in a high Cost RE market or a low cost RE market?  

Make sure your rehab is "renter" cost rehab. etc. 

For a 30 year Conventional loan, I'm at 6.5% rate (6.808% APR) for a duplex, 95% LTV, 780+ FICO, owner occupant.And I'm assuming they're paying $2k of your closing costs - not your down payment.

While this can maximize leverage and ROI, challenges include getting lender approval for seller financing, high carrying costs, and the pressure of short-term loans.

Determine cost to renovate. 

I made a few thousand less than expected but I figure that's just the cost of doing business sometimes.Based on my experience I wouldn't let the remote possibility that a homeowner might go into greed mode dissuade you from doing these deals.

A) it controls my cost.

Bonus points if they’re used to working with investors or can help keep costs in check while maintaining quality.Cheers,Kevin I would say this about BRRRRR, especially as a newer investor.