NEW YORK — Google is rolling out a major expansion in New York City, spending more than $1 billion on a new campus along the Hudson River that will allow it to double the number of people it already employs here.

The internet search giant will fashion a campus exceeding 1.7 million square feet along the Hudson River in the city’s West Village neighborhood, Ruth Porat, senior vice president and chief financial officer, said in a blog post Monday.

Google opened its first office in New York nearly 20 years ago and employs 7,000 people in the city. That footprint has expanded continuously. Google said this year that it would buy the Manhattan Chelsea Market building for $2.4 billion and planned to lease more space at Pier 57, both about a mile north of the new campus along the Hudson River.

Google’s plan to expand is being announced a month after Amazon said it would put one of its second headquarter locations in New York’s Long Island City neighborhood, creating upward of 25,000 jobs in the region.