They are not pre conditions. Israel has an obligation to abide by its signed Road Map agreement and cease ALL settlement construction and dismantle illegal outposts. Settlements are also a violation of International Law. Israel also agreed to implement Resolution 194. Either Israel is an honest partner in peace or it isn't. Abbas provided Maps which Netanyahu refused to look at. Israel has provided no maps or any peace initiative.
Woman moderately wounded by firebomb thrown at her car in north J'lem (Haaretz)
from the article: Undercutting U.S. peace plan