add_random_external_estate_building

add_random_external_estate_building = {
	if = {
		limit = {
			free_external_domicile_building_slots >= 1
		}
		random_list = {
			10 = {
				trigger = {
					NOR = {
						has_domicile_building_or_higher = temple_small_01
						owner = {
							government_has_flag = government_is_celestial
						}
					}
				}
				add_domicile_building = temple_small_01
				if = {
					limit = { has_domicile_building = estate_main_03 }
					add_domicile_building = temple_small_02
				}
			}
			10 = {
				trigger = {
					NOT = { has_domicile_building_or_higher = barracks_01 }
				}
				add_domicile_building = barracks_01
				if = {
					limit = { has_domicile_building = estate_main_03 }
					add_domicile_building = barracks_02
				}
			}
			10 = {
				trigger = {
					NOT = { has_domicile_building_or_higher = watchtower_01 }
				}
				add_domicile_building = watchtower_01
				if = {
					limit = { has_domicile_building = estate_main_03 }
					add_domicile_building = watchtower_02
				}
			}
			10 = {
				trigger = {
					NOR = {
						has_domicile_building_or_higher = vineyard_01
						owner.culture ?= {
							has_innovation = innovation_champa_rice
						}
					}
				}
				add_domicile_building = vineyard_01
				if = {
					limit = { has_domicile_building = estate_main_03 }
					add_domicile_building = vineyard_02
				}
			}
			10 = {
				trigger = {
					NOT = { has_domicile_building_or_higher = guardhouse_01 }
				}
				add_domicile_building = guardhouse_01
				if = {
					limit = { has_domicile_building = estate_main_03 }
					add_domicile_building = guardhouse_02
				}
			}
			10 = {
				trigger = {
					NOT = { has_domicile_building_or_higher = garden_01 }
				}
				add_domicile_building = garden_01
				if = {
					limit = { has_domicile_building = estate_main_03 }
					add_domicile_building = garden_02
				}
			}
			10 = {
				trigger = {
					NOT = { has_domicile_building_or_higher = storage_01 }
				}
				add_domicile_building = storage_01
				if = {
					limit = { has_domicile_building = estate_main_03 }
					add_domicile_building = storage_02
				}
			}
			10 = {
				trigger = {
					NOR = {
						has_domicile_building_or_higher = grain_field_01
						owner.culture ?= {
							has_innovation = innovation_champa_rice
						}
					}
				}
				add_domicile_building = grain_field_01
				if = {
					limit = { has_domicile_building = estate_main_03 }
					add_domicile_building = grain_field_02
				}
			}
			10 = {
				trigger = {
					NOT = {
						has_domicile_building_or_higher = rice_field_01
					}
					owner.culture ?= {
						has_innovation = innovation_champa_rice
					}
				}
				add_domicile_building = rice_field_01
				if = {
					limit = { has_domicile_building = estate_main_03 }
					add_domicile_building = rice_field_02
				}
			}
			10 = {
				trigger = {
					NOT = { has_domicile_building_or_higher = stable_01 }
				}

As written in game/common/scripted_effects/07_dlc_ep3_scripted_effects.txt.