Con Ed Plans To Sell 3 Lots Near the U.N.
Consolidated Edison Co offers for sale three prime East Side, New York City, lots likely to be sold to housing developers and expected to together fetch $200 million; says lots, totaling 4.41 acres, might be combined with fourth, now site of generating plant, which covers 9.5 acres; most of land is currently zoned for manufacturing; map (M)