How to remove a building in history?

[tsf4]

I would like to make a unique building, but want it built for certain years and NOT built for others. How do I achieve this?

 

[Romulien]

I think in theory there could be 2 techniques :

1) Via b_holding history file

1000.1.1 = {
   effect = {
      add_building = unique_building
   }
}
1500.1.1 = {
   effect = {
      remove_building = unique_building
   }
}

2) Via technology history:
When starting a new game, a building will be pre-built if the province has higher technology than the building trigger requirement(s) + the value of extra_building_start + a random number 0-1
The starting technology value are per duchy so it might be less precise.