Google LLC unveiled plans to invest more than $1 billion in the expansion of its existing campus in New York City.

The Alphabet Inc. unit is creating the new 1.7 million-square-foot Google Hudson Square campus, which will include two leased buildings on Hudson Street and another on Washington Street, said Ruth Porat, senior vice president and CFO of both Google and Alphabet, in a Dec. 17 blog post.

The expanded campus will be home to Google's New York-based global business organization. Employees are expected to start moving into the Hudson Street buildings by 2020 and the Washington Street building in 2022.

Earlier reports said Google is close to sealing a deal to buy or lease a planned 1.3 million-square-foot office building at Oxford Properties Group's $2 billion St. John's Terminal development project in Manhattan, N.Y. The tech giant is also looking to add about 300,000 square feet to its existing 1.2 million-square-foot property at Chelsea Market, also in New York City.

The expansion efforts at Chelsea Market and Hudson Square would enable Google to more than double its workforce over the next 10 years, according to the blog post.