A second method is to sub-lease an existing sign. If you can find a sign that does not have an advertisement, there might be an opportunity to lock it up and then lease it out. In this example, you need to do your research. There is probably a reason why the sign is not rented out. If it is a simple cosmetic issue such as an obstructed view due to an overgrown tree, this can be easily fixed. You've now rehabilitated the sign and create value for the advertisers.