Real ROI for Rental Units

[Vinay Nair]

I would request experts on this forum to advise if it make sense to invest and have a good ROI. This is real opportunity.
Metro Detroit
10 single family homes built in 1950s - brick
each : 3 bedroom, basement etc - 900+ sqft
All are rented
Avevrage Rent : $850
Average Tax : $2400
Average Insurance : $800

Asking price $350000

What is ROI in this after real expenses ?
What could be the exit strategy ?

Really appreciate some good feedback.

Thanks