There are a lot of variables to every investment decision.

Which would probably cost around $650 a month in non variable expenses (basically PITI on a 30 year note).

Even though you did provide a lot of relevant information, there are just too many variables for anyone to give you an accurate answer. 

Terms: - 2-year payback- the loan was from a variable HELOC; amortized monthly payments based on the variable interest rate of that month In the first year, I managed a few cosmetic upgrades to each room and turned the basement into a functional workshop.

Terms: - 2-year payback- the loan was from a variable HELOC; amortized monthly payments based on the variable interest rate of that month How did you add value to the deal?

@Eric Fichera Fellow Staten Islander here; Lots of variables.

To be frank I do not understand all the variables here, particularly the vacancies and security of my property in a multitenant setup.ThanksAnilThanksAnil

Each of these variables will dramatically change the advice for the individual asking this question.

Fixed rate debt at historically low interest rates tend to be ideal, while variable rate or high rate debt is suboptimal. 

Looking into this right now: https://www.soundproofingcompa...Most expensive mistake I ever made was going variable when I bought this place ;) what did you use for insulation?