Now that's a way to go.

Since acquiring a four-unit property on the Northwest side, my bi-monthly bill has typically been around $500.

Purchase price: $161,000 Renovating now What made you interested in investing in this type of deal?

A 6%+ annual appreciation rate is decent. 

Hey Jeff without knowing any details everything is what you are able negotiate. but you have to take in account the years interest rate and purchase price and what kind of cash flow.I will say get a mentor if you’re inexperienced these kind of deals can go left if you really have little knowledge when it comes to structure .

I currently have a single family property averaging $330 a month in cash flow which is going into a basic checking account seperate from personal.

Assuming when you say "$3900/mo in rental income" you mean cash flow.That means it will take you about 13 years of rental income to equal the $500k in equity you have now. 

Usually, it will be allocated by price or sq footage or something that is a common factor by your accountant.If you use the purchase price then 46% of the basis would go into the 170K house. 

You can purchase leads, have a robust CRM, VAs etc.

Would you choose a different market, build a better team, or take another approach?