I am to surprised to hear that this is CA.

Detroit can be tricky to analyze, and some deals that look good on paper might have hidden pitfalls (taxes, rehab surprises, etc.).

Think about the extra income you need on top of that to pay for retirement(if it's just quitting work early),  medical bills, and unexpected expenses.

I watched Jim Cramer, the mad money guy, on a crypto podcast / video, and he seems very interested in it at this point - I would not be surprised to hear that he has had a conversation with someone at Fidelity Digital Assets about buying some. 

Homeownership comes with unexpected expenses, so having at least 3-6 months’ worth of living expenses saved up is generally recommended.

Since the BRRRR strategy relies on recycling your capital, it’s typically better to stick to the minimum needed for favorable loan terms.Also, consider leaving a cushion in your HELOC or reserves for unexpected rehab costs or delays.

They may surprise you with their honesty and that may make them a better syndicator actually.

NAREB and the year might surprise you because it was 1950. 75 years of negotiating commissions later, there are more real estate agents than ever before, so clearly real estate brokering is different than stock brokering.  

- What’s a safe contingency budget percentage to include for unexpected expenses?

And also try to prepare a buffer for unexpected issues (there's always something!).