One day before the Monday deadline imposed by the District of Columbia Council, baseball signed the lease approved by the council last month.
It calls for a ballpark to be built along the Anacostia River, south of the capital, with a provision capping the city's spending for the project at $611million.
Baseball, which will not select a new owner for the team until a lease is in place, had expressed concern over the cap, which altered the original 2004 agreement that brought the team from Montreal last season.
In particular, MLB was concerned about the team's future owners being forced to pay cost overruns.
The lease will take effect if the council agrees to several provisions, including an agreement that the city will not enact any legislation that violates the terms of the lease. Other provisions deal with the issuing of bonds that pay for construction and how those bonds will be funded, reports USATODAY.
The council is due to study the provisions over the next 48 hours.
The Nationals will continue to play at RFK Stadium until the new stadium opens.
