Three properties for $170K sounds like a bargain, especially if you can force appreciation after a turnover.If the property is breaking even with the initial purchase, I would pull the trigger on this deal with plans to BRRRR (Buy, Rehab, Rent, Refinance, Repeat) the properties as each one turns over to recycle my cash if the numbers work out.

In the future change your buy box to a value add box.  

@Jorge MartínezIf the builder is offering incentives to buy down your interest rate and if there is some negotiation room on price the new builds can be a good investment because you'll have a lower monthly payment and new builds usually come with some type of warranty and will have lower maintenance cost because everything is new.

If you plan on buying 1-2 properties a year at $200k, is a commission between $3-6k.2.

Others is buying dirt from the farmer platting it doing all the horizontal work then building structures . full gambit .. 

The Investment I’m looking at is a  3 bed 1 bath and has a really nice already running Airbnb 1bed/1bath guest suite that generates an average of $1500/Month.

BUT, if buying a new investment property you can use 75% of the appraiser determination of the new property.If on the tax return, you can use short term rental income OR long term income.

Congratulations about buying your first rental property!

Buying another multifamily would complement the 6 SFH and round out your portfolio. 

Typically Credit Unions are good sources of capital for Lines of credit but when it comes to refinancing there seems to be quite a bit of red tape.You want to work with a broker who essentially has the entire mortgage industry in the palm of their hand and can put you into the product best suited to meet your needs.