Now many information websites will have information about renting and selling factories, like some large-scale comprehensive categories. Or have a separate information network like a factory building.
If there are requirements, you can basically screen, such as area, area size, price and so on. And you can find your own requirements. Generally, there is a telephone, so you can call for advice first.
Then come to the door according to your own requirements and talk about the right conditions.
Others can also be found through newspapers, radio and other channels. Or go directly to the area you want to see at the scene.