sheriff's sale---- shall I bid or not?

[Alex Shane]

I am interested in a property scheduled for sheriff's sale but not sure if I should give it a shot or not. 

The property is owned by a business, but the business owner passed away a few years ago. The property has $150K IRS lien.  The property value is about 600K, first loan is 250K.

I have mainly two concerns: 

if the IRS lien will be wiped out or not. The IRS lien was recorded after the first mortgage judgement. 

For this kind of ownership, will it be more risky to have title issue? For instance, someone shows up claiming being the business owner's relative/heir. 

Any advice would be greatly appreciated. Thank you in advance!