The White House is installing a permanent helipad on the South Lawn.

President Donald Trump confirmed to reporters in the Oval Office on Monday that the White House will receive a granite helipad paid for by Sikorsky Aircraft, a subsidiary of Lockheed Martin, to support the new fleet of helicopters used as Marine One.

A Lockheed Martin spokesperson confirmed the contribution and told Business Insider that it was being made to the National Park Service.

Trump said the permanent feature will help protect the South Lawn lawn.

Sikorsky’s newer helicopters are about “two and a half times more powerful than the older ones,” Trump said.

“When you fall on the grass, it’s not that the grass becomes discolored. It rips off,” he said.

Trump told reporters that the helipad will bear the White House seal and that Sikorsky will pay for the project. The president said the heliport will cost between $5 million and $6 million.

“Sikorsky is paying for it. Do you know why? Because they didn’t tell us how powerful these helicopters were,” Trump said. “And they felt a little guilty.”

A Sikorsky spokesperson said the new presidential transport model, the VH-92A Patriot, offers “higher performance and lower maintenance costs and time than the current fleet of presidential helicopters.”

Spokespeople for Sikorsky and Lockheed did not say how much the project would cost or how long construction would take.

A White House spokesperson did not respond to a request for comment.

Recent photos show that the heliport is under construction.

The use of the South Lawn as a landing zone to transport the commander in chief dates back to the Eisenhower administration, as helicopters provided a faster and easier mode of transportation without the need for a motorcade.

Instead of a traditional landing pad, Marine One typically lands on temporary landing pads or circular disks placed on the grass.

Below are photographs documenting the history of helicopter landings at the White House and the installation of the new helipad.