I mean myself and any bank would need more details, but if you utilize that large sum as a downpayment and have a small mortgage, wouldn't you easily qualify for the debt to income?

If you can't manage what you currently have, you won't manage additional income from investments.

Is it common to purchase a home with other debt?

Quote from @Zara Massoud: Hi, The PM company we signed on has a clause to add them as 'additional insured'.

The landlord should be named on the tenant's insurance policy for additional protection and to assist with tracking compliance.

I am considering building up on my fourplex. 2 additional units.

Additionally, I would like to attempt to do the process Owner/Builder with subcontracting work out as well as doing some of the work I'm comfortable with (I have some experience with bathroom & kitchen remodeling an am not new to the construction industry).

If I create a debt fund that offers 9% interest on first lien notes with a 5-7 year payout, would that be attractive to high net worth investors?

It may or may not show on a credit report, depends on the servicing and you should have the loan serviced.Failure to include the debt on a future loan application is mortgage fraud, wanna go to jail?

Can you do side hustles, cut down costs to get rid of these debts?