Where are the HVAC controls and do both units have the ability to access it?

I think it would be a good experience for me to get landlord experience in a mostly controlled environment aka I live there. 

Here’s what I recommend:Cash Investments:No Debt, No Stress: With cash, you avoid third-party control and loan vetting, giving you full control of returns.Equity Builders: Partnering with builders often reduces your property entry cost by up to 20% below market value.Consistent 10% Returns: With an all-cash approach, achieving 10% ROI is realistic and efficient.Financing Strategy:If cash isn’t feasible, consider a balanced financing model:40-50% Down Payment: Keep leverage manageable while maximizing returns.Lower Debt Exposure: A conservative loan-to-value ratio (LTV) reduces risks and keeps returns stable.Work with a Builder: Collaboration with builders can lower acquisition costs and increase your ROI.Key Takeaways:If possible, prioritize cash for simplicity, control, and consistent returns.Financing can work well with a disciplined approach to debt and a strong underwriting process.Partnering with builders offers opportunities to reduce costs and enhance your portfolio’s profitability. 

If you do it right, it’s arguably the best market to invest.Purchase: $80k-$130kRent: $1100-$1500 (no rent control in MI)1% rule: .9%-1.4% rule dealsCoc ROI: 5-12%Total ROI: 20-40%Cash flow: $50-$250/door (after all expenses and budgeting for maint, capex, vacancy)Appreciation: 3-10%+ (has been double digit for a decade)Location: C+, B-These numbers are based on the “sweet spot” in Metro Detroit.

If you’re still concerned, you could consider installing programmable thermostats or low-flow fixtures to help control costs without relying entirely on tenant behavior. 

You might have a home that literally takes one dividing wall of 2x4s and a kitchenette, or you might have a home that you need to add exterior doors, breaker panels, relocating utilities, etc.

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A quality deal you have control (under contract, seller only wants to work with you, etc.)3.) 

Just know what you're buying as there's still a lot of FP panels, 60 amp service, aluminum wiring, asbestos tiles/tape, and plaster & lathe walls.  

He may get stuck with rent control laws that prevent him from catching up later.