SE V modding: Once-per-empire buildings

[Ragnarok-X]

hey there,

i want to create a facility which requires 15k space, creates a good amount of research, increases research empire-wide by X percent AND can only be build once per empire.

Im using Lee Wilson`s SEV-Modder.
I have the "point generation - research" with "space object" and the "point generation modifier" with "galaxy - this player"

Now, i have no clue how to work out the requirements (once per empire).
Fyron wrote me:

Check out these functions:

11. Added - Formula function "get_empire_ability_facility_count".
12. Added - Formula function "get_empire_specific_facility_count".
13. Added - Formula function "get_empire_queues_ability_facility_count".
14. Added - Formula function "get_empire_queues_specific_facility_count".


I realize i require these, but i have no idea how to work them into by facilty file (true/false and/or all those buttons are too much for me).

I envy the times when i was modding SEIV: So much easier

Any takers ?