My mom was in the process of selling two rental properties that is held in a joint revocable trust. She passed before it was settled. My father had passed earlier. So on her death, the trust became irrevocable. Are the properties eligible for the step up cost basis for my father and mother's share? If not, what basis should it be based on, property tax evaluation, FMV, appraisal fr my father's DOD or ? Thank you in advance.
