Huge IRS Lien And Cash Out Mortgage

I would like to buy a foreclosure at auction (tomorrow) that has good equity of 60k and also has a huge IRS tax lien of 185k attached to the property. Is it possible to buy at auction (all cash) and then take out a new mortgage to get my investment funds back while the IRS lien is still active? Then I will wait the 120 days for the IRS redemption period to expire? Also, how often does the IRS actually redeem a property? And might they redeem here because the Tax lien is so high, 185k? Thanks Dave