Me. Stat. tit. 1 § 15
In accordance with the Constitution of the United States, Article 1, Section VIII, Clause 17, and Acts of Congress in such cases provided, the consent of the Legislature is given to the acquisition by the United States, or under its authority, by purchase, condemnation or otherwise, of any land in this State required for the erection of lighthouses or for sites for customhouses, courthouses, post offices, arsenals or other public buildings, or for any other purposes of the government, except for the designation of property as a national monument pursuant to 54 United States Code, Section 320301 (2015). Deeds and conveyances or title papers for the same must be recorded upon the land records of the county or registry district in which the land so conveyed may lie; and in like manner may be recorded a sufficient description by metes and bounds, courses and distances, of any tracts and legal divisions of any public lands belonging to the United States set apart by the general government for either of the purposes before mentioned, by an order, patent or other official paper so describing such land. [2015, c. 458, §1(AMD).]
1 M.R.S. § 15