You simply login to your brokerage and withdrawal what you need on Margin.

A bank statement loan may be an option for you if you have at least 12-months income history - this is a more favorable method of calculating income for self-employed individuals where we analyze your personal or business banks statements. 

If you can get a property for a decent value, then you should still be able to utilize the BRRRR method.

Hi! Question for the experienced folks.
I’ve run into a slight problem. I thought I could utilize a HELOC on my investment property but DTI is high. I have a bridge/rehab loan.  I thought I could use the HELOC but I ...

Where it gets tricky is when it comes from an "unkown" source where it cannot be sourced and seasoned.DSCR allows for gift funds, funds from a partner, funds from an IRA or 401K but they will require the terms and conditons sheet to see what the penalty for early withdraw would be to add it inot the DTI - Debt to income. 

If all else fails, you could try the "cash for keys" method where you offer them some money and help finding new housing to get them out.

There is also the rehab step to BRRRR method.

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

I’ve felt rather drawn to catering towards college students and considered doing the “rent per room” method.

The most common method of seller financing I see is seller carryback.