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Rockefeller’s “city within a city” will be transformed:

Rockefeller’s “city within a city” will be transformed.

New York City‘s iconic Rockefeller Center plaza is getting a facelift.

The plaza could get about 35,000 square feet of new shopping space, elevating the sunken part of the plaza into retail space that will reach to street level, the New York Post reported. The project, created by Italian architectural group Citterio-Viel & Partners, would likely cost tens of millions of dollars.

Related: Get a First Look at This Year’s Rockefeller Center Christmas Tree

The midtown landmark officially opened in 1933, and since then has become one of the city’s most famous attractions and been featured in film and television.

The renovation will be the first major change to the Rockefeller Center, a complex of 19 high rises covering several city blocks, in decades. It had always been intended as an expansive undertaking, with John D. Rockefeller conceiving of it as a “city within a city.”

Details are sparse on the project, but more information and images are expected in the next few weeks.

News of the project comes as Rockefeller Center prepares to light the most famous Christmas tree in New York City, on November 29. This year’s tree, from Pennsylvania, will arrive in midtown on Saturday.