Buying Sheriffs Sale with IRS Lein

[Shawn Walters]

A sheriffs sale property I am buying from the courthouse has an IRS lein on it.  I knew about it, so it's ok but have never done one.  But what I'm wondering is regarding their clawback.  So they 120 days from when I close (tomorrow).  The property is $383k.  Market value after maybe $20k (all cosmetic) and 2 weeks of work.  improvement is around $460k.  IRS lein is $90k.

I'm told if I do any work at all on the property in the next 120 days, it could be for nothing if the IRS exercises their right to buy it.  And it'd only be for the courthouse price, not the improvements.  So what do you guys normally do in situations like this?  Sit on it for 120 days, or take the chance that the IRS won't want to mess with it?   I'm thinking the IRS wouldn't mess with it, as they'd need $300k more of taxpayer money just to buy it and sell it, then pay a agent commissions on both sides, and market time.  But I could be wrong.  

Just looking for your experience in this and opinions.

Thanks!