Did I accidentally buy a BRRRR

[Randy Wilson]

So I a total amature when it comes to REI. A few years ago I got fed up with renting an overpriced apartment 10 miles from work and decided to buy a two family that is biking distance to work (thanks Mr. Money Mustach).

Fast forward to now and I'm getting the REI bug, and have been looking around the BP blog posts and forums trying to get some ideas of what I might want to do next to move closer to financial Independence. BRRRR is such a cool concept I'm really wondering how I could get started. Let me describe where I'm sitting now and ask what your opinions are.

I'm 2015 I purchase a 3000 sqft two Family home for $210,000 with 3% down for 3% over 30. We live in the larger unit (3Br/2Ba) and rent the 1Br/1Ba for $750/mo. Our apartment would probably rent for around $1350. After buying I've redone the kitchen, both bathrooms and added a BR upstairs (no additional SQFT just better use of floorplan) for another $17k. The 1 BR apartment is untouched because the property came with a renter, and I'm happy collecting that money with little work needed. 

I bought this house making sure it was going to stay a positive income stream after we moved out. The renovations we're simply to make the apartment we live in feel more like home while we saved up to buy our own SFH. I didn't analyze the deal in looking to leverage the equity into adding more property to my portfolio.

My question is, after imrpoving  my apartment and making a few years of mortgage payments, how can I figure our if I'm anywhere close to a position where refi makes sense to fund an additional piece of property?