Thanks for many good points

Thanks a lot.

according to you, if bank A has the 1st mortgage on the property C. I can bid as high as $350k which is the up limit I am ok to buy.

But va_landlord mentioned that bank A will not give money to XYZ, so A will take all $350k for its 100k loan?

I don't know how much bank A will ask initially until on the court, there is no infomation about that before the auction.

With all those unknowns, what is the maximum amount I can bid if I want to control the total cost below 350k? This sounds simple question, is still unanswered.