A lot of homeowners rent out extra space to get an extra income. If you own a piece of property, you may also consider cell tower lease to increase your monthly cash flow. Companies are always interested in new sites where they can build or install cell towers to boost their coverage in the area.
You can take advantage of this demand by offering your land or your building as host for these towers. As long as you meet their requirements, you could be looking at steady payments for several years. The actual value will depend on the location and the type of installation.
If you are in strategic locations, then you are likely to get several offers. Study each option to find the best deal among them. Consider other perks that they might be willing to provide aside from a higher monthly payment.