I self financed it until I had to take on some loans due to delays and cost overruns (ever heard of such a thing???).

I purchased them several years prior to Covid at a very low price compared to today's market. 

Partner Driven financed the Shalom Dr deal using its own capital, covering the $225,000 purchase price and $26,564 in renovation costs.

I actually just spoke to them today and they have all the support and lower cost.

Partner Driven financed the Turner Dr deal by using its own capital, covering the $52,000 purchase price and $14,700 in renovation costs.

Partner Driven financed the Wren Ct deal using its own capital, covering the $128,900 purchase price and $50,000 in renovation costs.

Does anyone have any experience with the cost ballpark and requirement to do this with a single residential (not multifamily complex)? 

Before the work, our house elevation was +0.5  readings the highest,  - 2.5  in several other low spots. 

Therefore, I am interested in buying him out, but before I do I want to understand if it helps me or hurts me in my investment journey.I would be buying 60 acres for $260,000 and it would cost me $60,000 for the down payment and closing costs. 

You need to study Low and No Money Down Real Estate Investing.