Amazon plans to occupy 1 million square feet of office space at the former Citigroup tower in Long Island City as part of its plan to open a new headquarters in the neighborhood, the landlord of the 53-story building announced Tuesday.

“We thank Amazon for selecting One Court Square and Long Island City for HQ2,” said Nicholas Bienstock, managing partner of Savanna, owner of the tower that has been anchored by tenant Citibank, said in a statement.

The move is a potential godsend for Savanna.

Citigroup, the main tenant in the gleaming 1.5 million square glass tower since 1989, is looking move most of its workers out of the building by 2020, emptying 1 million square feet or two-thirds of the space.

“We also thank Citi for its critical role in facilitating delivery of the space, as well as the City and State of New York for their hard work to make this transaction possible,” Bienstock said.

There was a discrepancy between the city and the landlord on how much space Amazon intended to occupy at One Court Square.

A press release put out by the mayor’s office said Amazon will occupy up to 500,000 square feet at One Court Square.

But a Savanna rep stood by the 1 million figure when contacted by The Post.

The announcement was first reported in the Commercial Observer.

The Post last week reported that Amazon might lease space for up to 5,000 office workers at Citi tower.

In July, The Post reported that Citigroup was dramatically reducing its footprint in the tower.