Section 8 rent payment standards has the city willing to pay up to $3,120 per 3 br unit so I used gross rent of $6,240 given rent for the furnished 2/1 unit would be too variable with partners living there as they please.Phila.gov info:https://property.phila.gov/?

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

I can continue my own investment and my sister has money to pay off her debt.

Among the top reasons, I would recommend understanding what different price points look like in different areas along with taxes, legislation, population/economic growth, affordability & rental demand. 

the way the DSCR ratio is calculated for example on a loan is the comparison of rent vs the mortgage payment plus taxes and insurance 

If the double needs updating and you are handy, you can force appreciate the unit you are living in while paying no or almost no money for the home as your renter covers most of your expenses.By the time you are done renovating + 3-5 years give or take you have a forced appreciated property. 

Has it's own tax return, etc. 

For those who have a hot tub for your rental, may I ask how much you schedule maintenance and how much you pay for that maintenance?

There are also a lot of problems with this model that make it dangerous or possibly illegal.Third, BP is full of free information and you shouldn't need to pay for a course when all the information is available for free or in a few books.1.

I will advise to buy a home with many rooms, your income will be higher. if one moves out, you have the other tenants paying the rent, which is different if you rent to only one person.