If one or more units are vacant, the remaining units often don’t provide enough cash flow to cover expenses, making it harder to meet operating costs.Maintenance costs: A fourplex comes with four times the appliances, plumbing, HVAC systems, and other components to maintain, leading to significantly higher repair and maintenance expenses than single-family homes.If you want to see the detailed calculation, read this BP blog - More Units Doesn’t Mean More Money—Why a Single-Family Home Can Beat a Fourplex.Resale value: Multi-family properties have a limited buyer pool—mainly investors—who base their offers on CAP rates.

So money can be made.The downside of syndications is that you have no control of the deal as a limited partner...  

The voucher holder is happy (very limited inventory) and as the landlord I can get a higher rent compared to the private market.

You are betting too much on the refinance portion if you try to BRRRR with hard money.

If your goal is less required documentation, DSCR is likely your best bet as most everyone as mentioned, possibly a bank statement program depending on your job structure. 

If we face any headwinds, liquid investments go first so probably crypto but then you bet equities will get pressed.

This could limit reinvestment potential.

Definitely an option in PA, FL you may be limited to 75%.

In our case this was an annex built without proper permission, which limited the m2 that the bank would value the property against, and limited to how much space we would be legally allowed to use.

Quote from @Makan A Tabrizi: Quote from @Bruce Woodruff: Quote from @Makan A Tabrizi: I'm renovating a studio apartment with limited space.