The Building Was 100% Leased. The Analyst Almost Missed the Risk.

Occupancy tells you what’s true today. The lease expiry schedule tells you what happens next.

Source: RIOO

An acquisitions analyst is three weeks into underwriting a commercial building.

100% leased. Strong NOI. Clean rent roll.

The memo is basically written.

Then someone in the investment committee asks a question that isn’t on the standard checklist:

What does the lease expiry schedule actually look like, year by year?

Nobody had pulled it. There was no obvious reason to.

Occupancy was 100%. What was there to check?

The answer, once someone actually ran it, was more than half the building’s income was tied to leases expiring inside the same fourteen-month window, starting five months after closing.

The building wasn’t a stabilized asset.

It was a fully occupied building about to become a massive re-leasing project, priced as though none of that were true.

The deal didn’t die. It got repriced, hard, and restructured around a much more conservative view of what that income was actually worth.

One question, asked late, saved the buyer from paying a premium for a risk the rent roll never mentioned.

100% Occupied Doesn’t Mean 100% Safe

Occupancy is a snapshot. It tells you what share of a building is leased right now, and that’s genuinely useful information.

It’s also completely silent on the two things that actually determine how durable that income is: how long the current leases run, and whether they end together or apart.

A building that’s fully leased on long, well-staggered terms has durable income.

A building that’s fully leased on terms that mostly expire in the same year has fragile income wearing the exact same 100%-occupied costume.

The number that mattered wasn’t on the same page as the number everyone was looking at.

WALE Looks Healthy. The Expiry Ladder Can Still Be Ugly.

There’s a standard tool built for exactly this problem.

It’s called weighted average lease expiry, or WALE (sometimes WALT, weighted average lease term).

WALE answers a useful question:

On average, how long is this income contracted to stay?

But it doesn’t answer the more dangerous question:

How much of that income disappears in the same year?

That’s where a comfortable average becomes dangerous.

WALE measures the average remaining lease term across a property’s tenants, weighted by how much income each one contributes. A longer WALE generally signals more durable income and can support stronger valuations and financing.

But an average can look perfectly healthy while quietly hiding a cliff.

A portfolio with a comfortable five-year average WALE can still have a third of its income expiring in year two, offset by a handful of very long leases pulling the average upward.

The average reassures.

The distribution is what’s actually dangerous.

WALE is where the analysis starts. It’s not where it ends.

What matters is the full expiry ladder: how much income rolls off in each individual year.

That’s where concentration hides in plain sight behind a comfortable-looking average.

What Actually Happens When the Cliff Arrives

When a large share of income expires in a single window, every re-leasing cost that would normally be spread across years lands at once, magnified by concentration.

Some tenants renew, but now on terms up for negotiation from scratch. If the market has softened, they renew lower, or not at all.

Others leave.

The space goes dark, carrying vacancy costs, followed by the full cost of re-leasing it: tenant improvements, leasing commissions, and concessions needed to close the deal.

Each of those is manageable for one lease.

Hitting a large block of them at once turns a normal annual expense into a capital event.

The timing risk is the cruelest part.

Nobody chooses the market conditions on the day their cliff arrives.

A well-staggered building re-leases a small slice every year and averages across good markets and bad.

A concentrated one is betting a large share of its income on the conditions of a single moment it never got to pick.

The Risk Eventually Reaches the Valuation

Rollover risk follows a building into its valuation and its financing too, which is exactly why an acquisitions analyst asking about it, not just a leasing team, is the right instinct.

A sophisticated buyer prices in the expiry profile because they know they’re inheriting whatever cliff comes with it.

Two buildings with identical current NOI won’t necessarily trade at identical prices if one has durable, staggered income and the other has a near-term concentration.

The same logic runs through financing.

Durable, well-spread income can support stronger loan terms, while a large expiry cluster sitting near a debt maturity can make a lender more cautious about refinancing.

Stack a concentrated lease expiry on top of a loan maturity in the same year, and two of a property’s largest risks just merge into a single moment.

Institutional owners have long treated this as a portfolio-management discipline: spread expiries, monitor upcoming rollovers, and begin renewal conversations well before contractual expiration.

That’s not exotic financial engineering.

It’s sustained attention to the shape of income over time.

Longer Isn’t Automatically Safer

It would be too simple to conclude that the goal is just maximizing lease length.

It isn’t.

Long leases lock in today’s rents, a benefit when the market is flat or falling and a real liability when it’s rising, since you’ve committed to rents you can’t reset.

And a long lease is only as durable as the tenant signing it.

A long, comfortable-looking WALE built on financially shaky tenants is false comfort that can collapse the moment one of them defaults.

The real goal isn’t maximum duration.

It’s a healthy shape: income spread across years so no single one dominates, anchored by tenants strong enough to actually honor the terms, at rents close enough to market that you’re neither leaving money on the table nor exposed to a wave of departures the moment renewal comes due.

A fully leased building can be a durable asset or a fragile one.

The occupancy figure that everyone leads with can’t tell you which.

If you want to go one level deeper, we broke down how to read the expiry ladder itself, and what owners can do before a concentration becomes a problem.