Filed at 2:50 p.m. ET NEW YORK (AP) -- Sixty- to 70-story office buildings, stores, cultural centers and a memorial to the dead are included in six alternative proposals for the World Trade Center site that will be released on Tuesday. Officials familiar with the proposals said that all six would replace the 11 million square feet of office and retail space lost in the Sept. 11 attack with a cluster of buildings much shorter than the 110-story twin towers. The officials, who spoke on condition of anonymity, also said that each version includes a substantial memorial to the victims....