A glass-enclosed, 7,400-square-foot penthouse in lower Manhattan sold for $30 million, a 13% discount that shows some of the borough's luxury developers are willing to negotiate price.

The 13-room TriBeCa neighborhood duplex was originally listed for $34.5 million, said Sean Murphy Turner, executive vice president for Stribling Marketing Associates of New York. The penthouse had been under contract since August and closed this month. She declined to name the buyer.

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