Process to transfer title of an apartment

My sister and I recently inherited an apartment from our deceased father. The apartment was in our grandfather’s building, and we would like to transfer title to my father’s brother’s daughters (there are 3 of them, and they are all adults if that matters).

Can someone please explain the process to transfer the title? There will be no sale per se - we simply want to transfer title.

All of us reside in the USA and have Taiwan passports.

Thank you.