The seat of government and capitol of the State of Oklahoma shall be and is hereby established at Oklahoma City, in the county of Oklahoma, in the said state; and the permanent capitol of the state shall be erected on the following described lands: Fifteen (15) acres of land surrounding a point on the half-section line running north and south between the northeast fourth and the northwest fourth of section twenty-seven (27), township twelve (12) north, range three (3) west of the Indian Meridian, otherwise known as the center of Lincoln boulevard at its intersection with the center of Twenty-second street, extending east from the right-of-way of the Atchison, Topeka and Santa Fe Railway Company; and the Executive Mansion shall be located in the vicinity of said capitol grounds on a site consisting of one-half (1/2) block, the same to be selected by the Capitol Commission.