Mostly from a home equity line of credit.

Prove that up to the seller so that they know you are a great credit risk. 

@Anita Z.I recommend finding an accountant who specializes in real estate taxation, tax planning and financial planning.

.: What is the average conversion rate for cold calling using software like PropStream, specifically targeting probate, foreclosure, or tax delinquency leads?

HELOCs on investment properties can be tricky since many traditional banks don’t offer them, but some lenders, and some local credit unions might be worth checking out.

So, in your considerations, I would park right there for a bit and determine how this would look for you.Since you have about 2.5 years to think about it before you would need to spring into action to take advantage of the rollover for tax advantages, maybe you try on a rental and see how it fits. 

Then what happens is the lender reports your payment history to the credit bureaus and each time hereafter if you ask for another loan and the lender pulls your credit then they are going to see your payment history and whether you made your loan payments or not which will likely influence whether or not they lend you money. 

You mentioned gross rents of $3400 per month and Principle/Interest/Tax/Insurance of $2500 per month. 

Home Equity Loan (HEL) or Home Equity Line of Credit (HELOC) – You could tap into the $150,000 in equity to secure a $30,000 loan.

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.