A trio of large law firms is set to move into their new home at the Hudson Yards development in early 2019. They may have more company soon.

An industry source said this week that Debevoise & Plimpton, looking for about 400,000 square feet, is pursuing a potential deal for space in the development, although a lease is not final.

A Debevoise spokesman said Thursday the firm could not comment. A spokeswoman for Hudson Yards developer, Related Cos., could not immediately comment Thursday.

Debevoise in 1998 signed a 20-year lease covering 416,000 square feet at 919 Third Ave., its current office space, according to a press release at the time.

Hudson Yards is billed as the largest private real estate development in the U.S., accommodating more than 18 million square feet of office, retail, and residential space.

One of the buildings in the development, 55 Hudson Yards, will soon be the new home of three firms: Cooley; Milbank, Tweed, Hadley & McCloy; and Boies Schiller Flexner. A Related spokeswoman on Monday said that 55 Hudson Yards was “fully committed” and that Related was planning a prebuilt space on a top floor.

Boies Schiller committed to Hudson Yards back in 2015, signing on as 55 Hudson's first commercial tenant. At the time, the building was pitched to open in 2018, and some firms suggested they could move toward the end of this year.

Now all three law firm tenants said they will move in early 2019.

A Boies Schiller spokesman said the firm expects to move in the first quarter. A Milbank spokeswoman said the firm plans to move into Hudson Yards around President's Day weekend in February. Meanwhile, a Cooley spokesman said the firm is moving as scheduled in late March.

Kathleen Anne Corless, a spokeswoman for Related, said the exterior of 55 Hudson Yards is finished and tenants are getting their space ready. She said the building will welcome its first tenants in January while the neighborhood around it, including public spaces, will open by March.