Richard Kahn and his family purchased 416 and 418 East 83rd St., pictured center with brick base, in the late 1970s and combined the buildings, converting them into co-operatives in 1986. Mr. Kahn recalls the purchase costing $800,000. He lived in the ground floor duplex in 418 for several years with his wife and children. The vacant apartment, available for rental or sale, is a 'sponsor unit' meaning that a prospective buyer does not require board approval.
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