Real Estate Investment Advice Needed

[marquin]

Hi there italkcashers,
Im in need of some advice on my first real estate project that am currently working on. The reason I'm sort of stuck is that the market am in has very high interest rates. Here are the details.

Property
Multi Family with 3 Townhouses
Mortgage: $510,000
7% interest @ 30 Years
Payments : About $3,500 p/m
@ 100% Occupancy I earn $500 p/m positive cash flow
My plan is to live in 1 unit and rent or sell the others.
Rental Potential: $2000 p/m each or $4000 p/m combined
I can sell them from 250k to 270k each
Should I sell them and pay off the mortgage?
Should I Rent them ?
If you were to rent the 2 units for cashflow, how much would be your minimum positive cashflow for this to be a sound investment?

Thanks in advance for your advice.