Seems awfully high for ranchland
That's about the going rate for a 20 acre homesite around here.
Not just "ranchland" and not just a "homestead." There's a lot of goodies on it, and there's an income stream associated with it. I would guess on something that large, bought when it was bought, it comes with the water and mineral rights. I would also guess it's all titled, and not just grazing and mineral leases 'n such.
And you get the "privilege" (by virtue of isolation) of shooting whatever(!) you want whenever you want, wherever you want.
A subdivider might drool over the opportunities it would provide.
And it's almost its own State. <grin>
I don't think just "$/ac." is a meaningful reflection of true market value.
But, it's been a long time since I dealt with Farms and Ranches, and never since I dealt with Texas Farms and Ranches.
Terry