They had exhibited the desire to pay down debt and had cashed out the parks before us that had agreed to owner finance.

If your brother is looking to invest in real estate largely from a tax reduction standpoint they should pay a qualified real estate tax strategist to review their specific situation and what may or may not work for them. 

This simple act of understanding can make or break the deal.Patience Pays: Results-driven but people-focused.

Billing is different for most and more than likely, you'll pay a retainer of some sort up front and have a balance due. 

I pay $875 (including principal, interest, taxes, and insurance) and rent it out for $1,625.

I used $80k to pay off personal debts and $50k to remodel it by myself with my two hands.

This allows you to use all of the tax and deferred depreciation recapture to purchase the larger MF propertyA consolidation exchange is where you sell multiple investment properties to purchase a larger and nicer investment property, but you also get the benefit of using all of the tax you would have had to pay to your advantage.

Focus on paying them off (smallest to largest), and you'll be living large in 20 years.

Now, you need to figure out how to find deals and pay for them.

I do not understand your remark as related to the DSCR loan.  2 ADUs are not allowed by f/f conventional financing but is not always enforced.Fortunately if you stay with the current tenant without a refi, by the time you pay principle it is likely the rent will have increased enough to absorb the increase mortgage payment.