public void spawn_building(BuildingLot building_lot)
{
Building building = get_city_building();
building_lot.set_building(building);
building.building_id = building_id;
building.building_type = city_type;
building.building_orientation = building_lot.orientation;
building.offset_position = building_lot.origin_tile;
building.max_capacity = building_lot.length;
building.person_grid = new GameObject[building_lot.length];
building.city = this;
building.building_lot = building_lot;
city_building_list.Add(building);
}