The first, would be a lower cash offer which would be fairly straight forward, but the other would be a higher offer with the property owner having the chance to earn interest over a fifteen year time frame. 

If you do that, business will come because you will have earned trust.

--> I was trying to earn as much sweat equity as possible and only invested about $25,000 into the deal to make that happen.The house is a three-story cash machine.

With that said, if I am able to bump the rent to market rent rate, I should be able to earn about $1000 net. 

Look at making extra income through your career or a side hustle.

Welcome @Ati Ok , house hacking when you are new, whether that's a single family house with 3-4 bedrooms, or purchasing a 2 bedroom condo for you and your GF to live in and charge her rent, is going to be one of the best ways for you to get your feet wet and start your real estate investing career.  

That's fifteen thousand dollars a weekend they were earning from walkins, this didn include the sellers.

An assumption with both is that you want the relationship to continue indefinitely and you are already set in terms of wealth. 1) you are 100% self serving, while keeping the other partner incentivized to keep making you money. 2) the other partner is a personal/family relationship and you want to earn a return on your money and maybe keep some equity but, again you’ve made your wealth elsewhere and you just want to help them be successful.

The earnings from the relinquished property will be $500k. 

I refinanced this and hold it as a rental today, the private money loan was paid off in full + interest earned.