They didn't pay for it, so they don't take care of it like an owner.Before you make assumptions about costs based on a seller's contribution to improvements, find out what they improved? 

Or just pay your sister a finders fee for getting the deal?

Focus on paying them off (smallest to largest), and you'll be living large in 20 years.

In fact I can have half of the rooms occupied and still pay the mortgage. 

My profile has my YouTube channel and I have an episode that shows you exactly how to create the comp set and look at amenities that matter, what others are paying for cleaning and how other listings look - that way you can see how to best market your property. 

Or paying off my debt, while I provide them with a nice house to live in instead of an apartment. 

This creates two loan payments ($100,000 of equity and $300,000 on the new mortgage).Key NumbersHome Equity Loan Interest Rate: 6%Mortgage Interest Rate: 7%Rental Income: $3,000 per monthExpenses (management, taxes, insurance, maintenance): $800 per monthIncome and ExpensesMonthly Rental Income: $3,000Monthly Expenses: $800Monthly Mortgage Payment: $2,000ExplanationThe investor earns $3,000 in rent each month.They pay $2,000 on the investment property mortgage and $800 on other expenses.This leaves $200 profit each month or $2,400 per year.However, you have to pay $6,000 interest on the equity borrowed.This leaves you with an annual loss of $3,600.While the rental property generates positive monthly income, the interest cost of borrowing the initial $100,000 results in an overall loss.

To be clear, you are not paying off the 80K mortgage.

.- More Predictable Rates: Rates better reflect the real risk rather than just being based on a flood zone map.Example Scenario (Simplified)- Old System: A house in a designated flood zone pays $1,000 annually, regardless of its elevation or distance from the water.- Risk Rating 2.0: That same house may now pay $1,200 if it's closer to the water and more vulnerable or $800 if it's higher up and better protected.Flood zones still matter under Risk Rating 2.0, but their role has changed. 

My net number is rental income minus expenses(3 mortgages, paying power bill at all three houses, property tax, insurance, internet in two properties).