Tenant Concentration Risk: American Tower Corporation's revenue is heavily dependent on a limited number of major wireless carriers, and any financial distress or consolidation among these tenants could significantly impact lease revenues.

Technological Obsolescence Risk: Rapid advancements in wireless technology, such as the widespread adoption of small cells or satellite-based connectivity, could potentially reduce the long-term demand for traditional macro tower sites.

Interest Rate and Capital Market Risk: The company's significant debt load makes it vulnerable to rising interest rates, increasing borrowing costs and potentially limiting its ability to fund future acquisitions or development projects.