A plat thereof must be made in triplicate, on a scale of not less than eighty feet to one inch, which must be duly certified under oath by the surveyor, one of which must be filed with the county auditor of the county wherein the city or town is situated, one must be deposited in the proper United States land office, and one with the city or town clerk. These plats shall be considered public records, and each must be accompanied with a copy of the field notes, and the county auditor must make a record of such plat in a book to be kept by him or her for that purpose, and such county auditor must file a copy of said field notes in his or her office. The said surveyor must number the blocks as divided by the roads, highways, and streets opened and generally used, and for which a public necessity exists at the time of making such survey, and must number the several lots consecutively in each block, and all other parcels of land within said town or city surveyed as herein provided, which said numbers must be a sufficient description of any parcel of land in said plats. Said survey and plat thereof shall conform as near as may be to the existing rights, interests, and claims of the occupants thereof, but no lot in the central or business portion of such city or town shall exceed in area four thousand, two hundred square feet, and no suburban lot in such city or town shall exceed two acres in area.