It was once home to Elinor S. Gimbel, who married a grandson of Adam Gimbel, founder of the now defunct department store chain. Elinor was also a brewery heiress, according to reports.

There’s the old New York — and then there’s the really old New York. A Civil War-era Upper East Side mansion is back on the market for $13.5 million. That’s a dramatic drop from the ...