The owner of the land in western Pennsylvania where Flight 93 crashed in the 9/11 terrorist attacks reached an agreement Friday to sell the parcel, clearing the way for the development of a memorial.

The National Park Service, Families of Flight 93 and land owner Svonavec, Inc. announced the deal for the 274-acres in Shanksville, Pa., in a joint statement.

The agreement gives the National Park Service access to the land, including the site where the plan crashed, and allows for the planning and construction of the memorial.

The three also agreed to let a court determine the value of the land.

Families of Flight 93 last month asked the Bush Administration to seize the land after negotiations with Svonavec to buy the parcel stalled.

"I am proud and pleased that we now have an agreement that delivers the property to the National Park Service so they can complete the project in a timely manner," said Michael Svonavec, president and treasurer of Svonavec, Inc. "The agreement allows the parties to cooperatively move forward on a methodology by which the evaluation will be determined."

The planned memorial is to cover more than 2,200 acres, and the families had said ground had to be broken early this year in order for a memorial to be build for the 10th anniversary of the crash in 2011.

Flight 93 was en route from Newark, N.J., to San Francisco on Sept. 11, 2001, when it was diverted by hijackers. The official 9/11 Commission report said the hijackers crashed the plane as passengers tried to wrest control of the cockpit.