Federal Tax Liens

a) You may not be able to get Title Insurance. But if you CAN get Title Insurance, go for it.
b) It depends how it gets sold: I've bought units a number of times at foreclosure sales with IRS liens on them. I'm pretty sure the IRS has a ?120? day "right of redemption", but pretty much never exercises it unless they think there was some shenanigans going on in the sale (similar to banks not going after people for deficiency judgments unless they think there was fraud involved).
c) If the DO exercise their Right of Redemption, they have to pay you back what you paid for the property, plus fees.

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David Goldsmith
DG Neary Realty