Subtract $350 for HOA dues, maybe another $400-$500 for electric and internet, and potentially water bills. 

@Lorenzo LopezPretend a map of Boston is a pool of water.

Pretty often no water, sewer, power or even roads to the property. 

So thankfully with the help of my mentor and his crew of Six, we were able to complete all prep and are amidst our final pass for sanding floors before our water-based polyurethane. 

doors need to be power washed, gutter needs to discharge further from foundation (deck is uneven and breaking, possibly due to water erosion?)

But it should only be attorney cost, the deed and recording fees (few hundred) , maybe a final water cert.

Quote from @Jaycee Greene: Unless you already have a capital reserve fund that will pay for unforeseen, major expenses, like a new water heater, roof, or A/C unit for example, I'd keep the profits in the account until it can cover 6-12 months of operating expenses.

Improve the grade if water flows toward or pools near the house.

Are there separate gas, electric and water meters for each apartment?

Bonus is I am getting new HVAC, Furnace and hot water tank.