There may be two reasons:
1. The owner have bought the property in peak times and wants to unload it, he collects the rent and doesn't pay to a bank.
2. And second, his tenants actually stopped paying for their rents and hence he can't continue to pay.
But, there are great opportunities in Worcester right now for investors and owner occupied home owners with MA financing programs available and, of course, careful prescreening of tenants.