Also, if it's a co-op, keep in mind that you also need to show at least 2 years of mortgage/maintenance in the bank as post-closing liquidity (co-ops want to see you have plenty of liquid assets AFTER the closing to weather any hard times).
If that doesn't explain things, keep looking. When I work with buyers, I research city records to learn the history of the apartment. Estate sales can often be discovered with a little detective work, they can be discounted. Sometimes a property is under a court order to be sold.
There are also a lot of distressed sellers out there, but as a buyer, you do want to know why the list price is uncommonly low before you pounce. You don't want to buy someone else's problem.
Licensed Real Estate Salesperson
Charles Rutenberg Realty, LLC
127 East 56th Street, 4th Floor
New York, NY 10022
(212) 688-1000 ext. 383
(917) 365-0876 cell and text messages
(212) 688-1919 fax