-you don’t have to pay interest on a large fixed sum of money until you find or are ready to pull the trigger on a deal-it allows you lock in some or all of the amount at a fixed rate so your protected against rising interest rates ( given the current market conditions I believe we will see a couple more increases from the Fed this year which will increase borrowing costs for any variable rate products)- See this attached article that does a good job of simplifying it https://www.investopedia.com/mortgage/heloc/fixed-rate-option/

There is one section for Average price.

The "50% rule" states that one can expect expenses on a long term average to total to roughly 50% of fair market rent, where the expenses include property management fees and capital improvements also but exclude principal and interest payments; principal and interest payments come out of the other half of the rent, and whatever remains is the net cash flow (if any remains).

All 3 tenants are paying lower than average esp the 1bd.

What type loan product are you using? 

They might call you when they have a deal before it is listed on the MLS.When first starting just do what is normal or average for that area. 

For instance some things to look out for are kick out clauses giving them the right to end the lease if sales don’t surpass or average a certain amount after a given length of time, stops on CAM increases, real estate taxes or insurance.

Could you see average days of vacancy on Zillow?

By the time you sell it, it will be sold as two units ( ~$150k - 200k per unit in average) instead of one unit and the performa also looks better with 2/1 + 1/1 income.

@David Smit On average, B type properties - solid middle/upper middle-class in good school districts will not cause your portfolio to suffer from losses.