BRUNSWICK — The U.S. Navy has signed off on plans to redevelop the Brunswick Naval Air Station property in Maine after it closes this year.

The announcement Thursday was the final step in the process of evaluating the environmental effects of the plan, which calls for the redevelopment of the airfield, 43 buildings and 3,200 acres of land. Of that, 1,570 acres would be reserved for recreation, open space and natural areas.

The decision to shutter the base 20 miles northeast of Portland was made by the Base Closure and Realignment Commission in 2005. The last squadron of P-3 Orion patrol aircraft departed in late 2009, and the base will close for good on May 31.