Long-term Renters in a Foreclosed Property - Possibility to Buy?

[Account Closed]

I live with 8 other folks in a "community/collective" style setup.  We have been here, well, I have, since late 2016.  Rent always paid on time.  This is a landmarked and residential area of Brooklyn. This is a 1900 house of over 5,000 sq ft.

We found out the current owner, her sister (the owner before her) and a group of previous tenants have a $1.5 million dollar judgment against them from a lender from back in 2008!!. Got a recent Notice of Sale this will go on auction block for the $1.5 plus interest and fees (since 2008!?!?!).  Somehow the 77 year old owner has been able to hold onto the house but she is getting frail.  She mentioned it had been appraised low previously (6 years ago?) for well under $2 million but homes half this size are going for $2.3-2.8 now

What could WE do as tenants of nearly six years?  Is there an approach that we could take here (to buy it from bank)?  Interest and fees on a 2008 judgment of 1.5 million - !!??!?! how much could this be?  This house does need lots of systems upgrading but interior is solid and beautiful - and over 5000 sq ft - over 65 windows, 15 rooms plus 4 bathrooms, single attached garage, full basement, corner lot.