Shown here, the 1,600-square-foot roof deck added in 2010. Mr. Weiss says he has considered dividing the space into separate apartments with Mr. Rajwan, but they decided to stay with the current layout. 'For me it would be a shame to touch it,' he says., describing the space as 'monumental' and 'so different.' 'I'd rather sell it as is, for someone to live like that, than to count the square feet,' he says.
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