From a Curbed NY online article:

The Empire State Building, New York City’s most iconic skyscraper, has been reimagining its observatory experience for some time now. As part of a two-phase project, a new observatory entrance at 20 West 34th Street debuted last August, and now, a new set of immersive exhibits are open to the public.

The 10,000-square-foot galleries, part of a $165 million project which began more than four years ago, include several displays that tell the history of the building from its construction to its prominent place in the city’s culture.

To read more click on following link: https://ny.curbed.com/2019/7/29/8934703/empire-state-building-exhibit-observatory-history-nyc