Directs the Department of the Interior to develop and maintain a current, accurate multipurpose cadastre of federal real property (an inventory of real property of the federal government) to assist with federal land management activities, including resource development and conservation, agricultural use, active forest management, environmental protection, and use of real property. Authorizes Interior to enter into cost-sharing agreements with states to include any nonfederal land in a state in such cadastre. Limits the federal share of any such agreement to 50% of the total cost to a state for the development of the cadastre of the nonfederal land in the state.

Requires Interior to submit a report, covering all cadastres and inventories authorized, operated, or maintained by all executive agencies, on: (1) existing real property inventories or any components of any cadastre, (2) consolidation of inventories and components, (3) the use of existing inventories and components of any cadastre, (4) cost savings that will be achieved, and (5) recommendations for legislation.

Requires Interior to: (1) make the cadastre required under this Act available on the Internet in a graphically geoenabled and searchable format; (2) ensure that the inventory required under this Act includes the identification of all lands and parcels suitable for disposal by resource management plans conducted under the Federal Land Policy and Management Act of 1976; and (3) prevent the disclosure of the identity of any one or more parcels of land, buildings or facilities on the parcels or information related to those parcels, if this would impair or jeopardize national security or homeland defense.