Third playthrough, still can't build a glass monument

[Graphis]

Every time I get to this point, the monument is prevented from being built, though it is available when I have a slot. Moving my realm capital didn't help. I have enough fame.
Any advice to be able to get this thing built?
https://steamcommunity.com/sharedfiles/filedetails/?id=3364438337

[Razorblade]

Does hovering over the "Construct" button not tell you what prerequisities you are missing?

[Graphis]

Just seems to need 2 years. It doesn't even ask me for gold.
Are things not developed enough?
https://steamcommunity.com/sharedfiles/filedetails/?id=3364444873

[ФShalaФ]

move and hold your mouse over construct button. it should tell you why you cant build it

[Graphis]

I am directly hovering over it in the screenshot. The box on the lower right is the requirements popup. I have no requirements except time.
-
Construct Glass Monument
2 years
This building is seemingly excellent for growing vegetables.
-
Above, I can build the grazing lands, but the glass monument is greyed out.

[suilles]

do you have the trait for it?
that building is open due to a event you have because of a trait you got and without it you wouldnt be able to build it.

[ФShalaФ]

Originally posted by suilles:

do you have the trait for it?
that building is open due to a event you have because of a trait you got and without it you wouldnt be able to build it.

but woudnt you get event only if you have a trait?

[CrUsHeR]

Well, it cannot be built in holdings which already have a special building

https://ck3.paradoxwikis.com/Special_buildings#Decision_buildings

[Graphis]

Originally posted by CrUsHeR:

Well, it cannot be built in holdings which already have a special building

But it's not a special building, I'm trying to build it in the leftmost empty slot in Santiago, that's where the build pop-up came from.
Moving my realm capital to a more minor county like Astorga doesn't provide the option to build the monument.
And yes, I have the trait, I had the event, I made the decision to build the monument, it's just I cannot BUILD the thing. Frustration.

[CrUsHeR]

I can't find the file where this building is defined, only the decision script.

Anyways, if the wiki says that you can't build this in a holding with a special building - and your screenshot shows a special building - then this is probably the answer.

[Graphis]

So what could be preventing me from building it in another county when I move my realm capital and I have an open slot?
I tried taking over Coimbra and it's capital county Porto and there was no glass monument there. Does that reset the decision or event, maybe?