In 1991 the PLO acknowledged their willingness to concede TO Israel more than half of the territory allocated to the "Arab state" in the Partition Plan i.e. all the territory seized by the Haganah in 1948-49. That is a concession vastly greater than anything that has ever been "offered" by Israel.
Key U.S. House Democrat cites troublesome issues in Iran nuclear deal (Reuters)
from the article: Abbas: Palestinians to resume UN bid if no peace talks