Section 6. Said Commission May Make or Cause to Be Made a Map or Maps

of said city, or any portion thereof, showing locations proposed by it for any new public building, esplanade, boulevard, parkway, or street, and grades thereof, any street, building, and veranda lines and grades thereon, or for any new square or park, or any changes by it deemed advisable in the present location of any public building, street, grades and lines, square or park, and may employ expert advice in the making of such map or maps.