If you'd ask this question while still employed I'd say apply the $8500 toward knocking down the debt quicker but since that is not the case I would build up your reserves to about 6 months then begin applying those funds to bring down the debt. 

Momentum builds over time, and I promise things will start falling into place.This year, I’m expanding into Columbus, Ohio!

You have tax benefits through depreciation and you are gaining experience via property management.  

Cash flow might take a bit of a back seat but building a team you can trust and building experience are top priorities in my eyes.

Now I will give my opinion on buying a four plex verses building one. 

--- Does the property have 2 Tax ID numbers or just one?

I enjoy helping BP members in any way to help build their real estate portfolio.

My Chicago mentality has only grown because I continue to grow and build a stronger network of A players here in the city!

I have over 25 yrs of hands on construction experience in almost all aspects and need help/guidance to build/grow a portfolio or fix and flip. 

If you need financial help, ask under the "Finance, Tax, and Legal" forum.