If an EIN had been obtained for the house and the estate sold it, then an income tax return should be file for the estate (Form 1041) and the gain or loss passed through to you as beneficiary.
There may be no gain but, if a beneficiary (or family member) did not use the house after your mom passed (i.e., there was no personal use), there may be a capital loss after selling expenses that could be used on your personal income tax return.
