To find out if HAFA is possible for you can call your lender. The person you speak to may not have all the information required to correctly advise you. They also cannot tell you over the phone if you WILL get HAFA approved. That process takes a while.
A HAFA short is done a different way than a traditional short. With HAFA you must fill out a packet for both HAMP (modification) and HAFA (sale) at once. The RDC or third party that facilitates HAFA and HAMP with your lender and investor work your information for a determination of approval. It’s very hard to and slow to get HAFA with Fannie Mae as the investor. Easier if it’s Freddie Mac. You must be late to be considered with Freddie Mac, not with Fannie Mae.