Link to a chapter from Legal Tactics, which is posted on the MassLegalHelp website. This chapter describes the foreclosure process, how to deal with these new owners, and how foreclosure affects your rights and responsibilities as a tenant. In addition, this chapter also contains a small section about the rights of former owners, which are different.
Go the the MassLegalHelp website (link below) to read the chapter in e-book form.
This chapter is currently being updated, scheduled for summer of 2014.