My goal: create an interest-free loan which is appealing to a potential homebuyer, yet doesn't make too big of a discount on my end.For example: If I sold my $300,000 house with 20% down ($60,000) over 30 years, at 6.7% interest rate: $1548.67 principal and interest per month1548.67 x 12 x 30 = $557,521.20What I would do would offer a lower monthly payment and no usury, but it would effectively be like a prepayment penalty.Arbitrarily, let's say 20% off the monthly payment, or $309.73 less per month: $1238.94 monthly payment.House would be sold at $446,018.40, which is $111,502.8 less than the total paid with a normal mortgage, but $116,018 more than the market price.

Now the buyer does most of their own research. 

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This is generally accurate - the value is going to be derived based on the "market" of buyers - since most buyers of SFR are owner-occupants and not basing price on rental potential, rents aren't going to be the source of value. 

Buy or inherit and hold for a long time, then cash out and redeploy equity into potentially higher cash flowing properties or other investments.2.

I'm considering helping on cost because they're potentially going to buy the property from me at the end of their lease, so trying to keep the relationship amicable.

They said they could potentially take action if the survey shows the boundary line truly cuts off the driveway.

I am interested in North Carolina as a market to potentially invest in.Can anyone provide feedback on the market?

Impeccable building, turnkey condition, and huge appreciation potential (Bushwick's booming!)

While paid databases like Yardi Matrix are commonly used for this, free resources such as Zillow Research Data and Zumper Research can offer insights if a paid database isn't available.