In 1973 my mother and her new husband did a property division.(inheritance) They gave me an apartment.
They did it in a form of sale ($5000) I never paid a penny. The stipulation was that I would never sell it until the last of them died. He died in 2010 and I sold it in 2012. I believe the way it was done it makes it fully taxable to me. Maybe had I inherited the right way I might not had to pay the taxes.
I also gave them power of attorney in case they had to sell if they needed to.
I guess my question is, is this fully taxable?

Did you live in the apartment for at least three of the last five years as your PRIMARY home? If so, then the sale is TOTALLY tax-exempt.

Otherwise, the basis is what your parents paid for the apartment.

By the way I forgot to tell you that this apt. is located in Italy and the proceeds from the sale are still there.
I lived in it for 2-3 weeks a year when I visited. Every year or other year.
As fot the basis,do I just research what it cost when it was built? Estimate? They did the building.
Thank you

Okay, then the apartment does NOT qualify for the tax exemption.

Contact the executor of the estate; he MAY know what your parents paid for the building and what the apartment itself may have been worth when they bought the building.