Money to be made in Paterson

The more I look in the MLS the more GREAT INVESTMENTS I find.  I just saw a 2 family house in a decent section of Paterson for $235k, with a garage, finished attic and finished basement.  Total income going to the investor would be around $4,000.  With a 10% down payment, the new owner could be making $2,000 for their pocket each month.  I don't know about anyone else, but an extra $24,000 a year could be very helpful to a household.  I also saw a great one family in the Eastside of Paterson for $235K with a Jacuzzi and finished basement.  It needed minor work, but definitely worth the money.  If I would not have made other investments, I would've bought those 2 houses.  What I can't understand is how there can be such great houses like those when we are in a market with extremely low interest rates and with people that have money and great credit.