Just saw the upgrade realtor screen.
It appears you cannot add land to your current farm, you can buy a new 12 x 12 farm for $3 million coins, and then upgrade that. You also need to be Level 44.
I saw this on someone's farm who is Level 16...
You can also buy the second farm for $120 FarmCash - that does not say you need to be Level 44 if you buy it that way...
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