Foreclosing on a note cash needed?

[Joe Fox]

Just had a quick question on when you foreclose on a 1st position note at the sheriff sale do you have to buy it back with cash or does the property just transfer to you if it does not go over your reserve amount.  IE  If the judgement amount is a 100K  and I put my reserve bid in at a 100K and the property sells for lets say 90K do I have to write a check to the court for 90K which in turn they give back to me after the sale is confirmed or does the property just transfer back to me.   

The reason I ask is I want to make sure I keep adequate reserves if I am lending money out and need to foreclose.  I have the question into my attorney also but have not heard back yet so I thought I would ask the community.

Thanks