5000 an acre for grassland in nowhere is nuts. won’t sell. You have no idea of land prices out west.
There were real estate listings for ranch land at $43,000 per acre in Arizona. The key is that different tracts of land will be very different. The 640 million acres are not the same.
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The surface rights to those grasslands is owned by the ranching families that have worked the land since before the US was created by our founding document, The Declaration of Independence.
The BLM has no rights thereon.