New York dealer Jack Shainman just opened an $18 million, 20,000-square-foot space in a 19th-century Tribeca landmark.

Cloudy. Very high chance of showers. The chance of a thunderstorm, possibly severe. Winds north to northeasterly 15 to 20 km/h shifting south to southwesterly 15 to 25 km/h in the evening. Sun ...