Consider vacancy rates, and non paying tenants or continually having late payments always wondering will you be paid this month or not, or should you evict are situations you can run into frequently with this type of investment.

Is this a tool you would use frequently? 

Being an actual 7a lender, I give my clients financing LOIs frequently.

There are multi family properties that pop up here frequently.

They were affordable to buy and cash flow pretty well but the tenants turn over frequently and don't take great care of the properties. 

I find I fix soft floors frequently in mine.

If you have a HELOC on your primary that is an option I have seen used fairly frequently.

The key thing is to appeal as frequently as possible and appeal the appeal and pay attention to deadlines. 

Please note the information provided below is a layman's definition designed to provide a basic understanding for the general audience.

If you're unsure of how to meet RE developers, they'll often frequent larger RE meetups as it's a good channel for them to network with other investors and brokers.