set_up_domicile_estate_effect

set_up_domicile_estate_effect = {
	if = {
		limit = { is_domicile_type = estate }
		# Intentionally one level lower than what you can get
		if = {
			limit = {
				NOT = { has_domicile_building_or_higher = estate_main_02 }
				owner.culture ?= { has_innovation = innovation_city_planning }
			}
			add_domicile_building = estate_main_02
		}
		if = {
			limit = {
				has_domicile_building = estate_main_02
				NOT = { has_domicile_building_or_higher = estate_main_03 }
				owner.culture ?= { has_innovation = innovation_manorialism }
			}
			add_domicile_building = estate_main_03
		}
		hidden_effect = {
			switch = {
				trigger = has_domicile_building
				estate_main_03 = {
					while = {
						count = 2
						add_random_internal_estate_building = yes
					}
				}
				estate_main_02 = {
					add_random_internal_estate_building = yes
				}
			}
		}
		fill_external_estate_building_effect = yes
	}
	else_if = {
		limit = { is_domicile_type = japanese_manor }
		# Intentionally one level lower than what you can get
		if = {
			limit = {
				NOT = { has_domicile_building_or_higher = japanese_manor_main_02 }
				owner.culture ?= { has_innovation = innovation_city_planning }
			}
			add_domicile_building = japanese_manor_main_02
		}
		if = {
			limit = {
				has_domicile_building = japanese_manor_main_02
				NOT = { has_domicile_building_or_higher = japanese_manor_main_03 }
				owner.culture ?= { has_innovation = innovation_manorialism }
			}
			add_domicile_building = japanese_manor_main_03
		}
		hidden_effect = {
			switch = {
				trigger = has_domicile_building
				japanese_manor_main_03 = {
					while = {
						count = 2
						add_random_internal_japanese_manor_building = yes
					}
				}
				japanese_manor_main_02 = {
					add_random_internal_japanese_manor_building = yes
				}
			}
		}
		fill_external_japanese_manor_building_effect = yes
	}
	else_if = {
		limit = { is_domicile_type = east_asian_estate }
		# Intentionally one level lower than what you can get
		if = {
			limit = {
				NOT = { has_domicile_building_or_higher = east_asian_estate_main_02 }
				owner.culture ?= { has_innovation = innovation_city_planning }
			}
			add_domicile_building = east_asian_estate_main_02
		}
		if = {
			limit = {
				has_domicile_building = east_asian_estate_main_02
				NOT = { has_domicile_building_or_higher = east_asian_estate_main_03 }
				owner.culture ?= { has_innovation = innovation_manorialism }
			}
			add_domicile_building = east_asian_estate_main_03
		}
		hidden_effect = {
			switch = {
				trigger = has_domicile_building
				east_asian_estate_main_03 = {
					while = {
						count = 2
						add_random_internal_east_asian_estate_building = yes
					}
				}
				east_asian_estate_main_02 = {
					add_random_internal_east_asian_estate_building = yes
				}
			}
		}
		fill_external_east_asian_estate_building_effect = yes
	}
}

As written in game/common/scripted_effects/00_administrative_effects.txt.