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EDIT: After unlocking Monument to Unity, I could upgrade the Development District to it, but still was unable to upgrade to Ecology Preserve.
You have to build the originals and then upgrade, unless using Build Upgraded and the patch
I did that. There is no option to upgrade.
Then you have a conflict
It might be Untedious Upgrading. I'll check that later and report back.
tech_eutab_linguistic_intergration (note the typo in intergration)
Probably due to the typo, no name or description are available.