not a great deal compared to buying 5 year term first trust deeps on performing rentals that pay 9 and 10% and you get paid off in 6 months then what .. no return.. until you find another deal so your drag on money turns your return much lower.. now if it was 10% or 7k over 6 months that would be something to think about.. but not an interest rate for such a short duration.

X will be determined by what ever return you're demanding.

Putting in $475K taking the current $116K and adding potentially $20K (and the meters would cost an additional $24K up front) would be a 7.5% return on cash.

Would I have to return a partial payment?

Wholesaler and selling real estate licensed or not is very hard to be successful at and requires significant capital  just like any small business were the returns can be in the six figure range.

I have also contacted several lawyers and not one has returned my call. 

Do you look for a certain percent return or a flat amount?

Something that tracks key metrics like cash on cash return, current valuation, occupancy, variances to budget, etc..

because we all have attachment to this property in some way , for people who watched the show practicaly lived  in this home and it would be an experience to walk this property that you grew up in but never lived there and the so many memories.

If it's a business and you are in the growth phase then you may want to minimize equity, while if it is more of a portion of a diversified portfolio, you may want to keep more equity.For example, I am in the growth phase of REI, with it being more of a business than a portfolio allocation I add to slowly, so I try to keep as little equity in a deal or property as possible while still hitting a minimum cash flow value, thus maximizing Return on Equity (RoE).