Tower companies have spent fifteen years compounding on a particular set of assumptions about capital, tenancy and lease escalators. Most of those assumptions are now under quiet pressure.
The argument
Three pillars of the towerco model are re-rating at once: cost of capital, tenancy growth from a consolidating operator base, and the implicit assumption that lease escalators would always sit above inflation. None of the three is dramatic on its own; together they shift the calculus on every refinancing, every build-to-suit programme, and every greenfield expansion.
What we see in the field
The towercos we are seeing navigate this well share an unusual habit: they rebuild the bottom-up business case from the operator's perspective every quarter, not just their own. That single discipline catches tenancy softness six months earlier than the standard pipeline review.
What it changes
For founders and CFOs, the next refinancing window will be the one where the new cost of capital is priced in for real. The covenants that were comfortable at 4% are uncomfortable at 7%, and uncomfortable covenants change behaviour.
Where to start
Before the next refinancing, run the case at the new discount rate, the new tenancy curve and a flat escalator. The portfolio decisions that survive all three are the ones worth defending.
