The Roth IRA and his money partner agreed to split the profits 50/50.

I equated a car owner to what you insist is invariably an "elderly individual" or a "widow" (as far as I know car owners come in different ages, genders, marital statuses, mental capacities and etc.).

Since then, me and my partner split away to start our own real estate company.

To succeed, consult with a local realtor or property manager, split utilities/responsibilities, and explore niche rental platforms like Hipcamp.Good luck!

We ended up lowering the price to the appraised value and basically splitting the difference. 

We do get a better fee/split structure, and that's a fair trade for the extra work of managing a large investor base and it's associated extra accounting and tax reporting overhead.I also find the advice in the OP to be contradictory. 

You’ll need to experiment with these variables until you find a method that works.These days, I’m fully invested in Google Ads, which doesn’t require data extraction and allows you to pre-screen people.Additionally, to monetize the leads, you could make a deal with a broker to get a finder’s fee (they can split the commission, but only if you’re a licensed broker).

Essentially, how much equity should I be prepared to split with in investor in order to not bring additional cash to the deal?

We have a friend/business partner who would give us $37,000 and we thought we would put about $10,000 and we'd split profits as 63% for our friend and 37% for us.

I recognize that the CoC return is not as high as we'd like, but it does come with some built in equity (~$100,000)Details:- 3/2 Single family house (1487 sq ft) with a 1/1 ADU out back- Zipcode 78745- Purchase price: $469,900- Down payment: $50,000 plus CC (includes assignment fee)- Seller Finance $419,900 at 3.5% interest; 30 year amortization with a 15 year balloon- PITI $2744.02- Rental comps: $2667 for the 3/2; $1505 for the 1/1 - LTR according to BP (Total $4172)- Repairs needed - minimal, coat of paint and maybe swapping a window unit A/C for a mini split