62.7% of $14.08 billion in occupancy-matched securitized self-storage debt is backed by properties with lower occupancy than at securitization, Trepp reported on September 25, 2026. Median occupancy in the matched sample fell from 90.5% to 87.0%, yet median net cash flow still rose 4.9% because low fixed coupons and interest-only structures mask refinancing pain until coupons reset.
How Broad Is the Occupancy Decline?
Trepp's headline is about breadth, not a sector-wide collapse. Most measurable balance is tied to assets that lost occupancy versus securitization-day underwriting, but 37.3% of the sample is flat or higher.
| Occupancy change since securitization | Balance | Share of measurable balance | Median NCF change |
|---|---|---|---|
| Down >10 pts | $2.58B | 18.30% | +2.10% |
| Down 5-10 pts | $2.39B | 17.00% | +5.90% |
| Down 0-5 pts | $3.86B | 27.40% | +0.40% |
| Flat or higher | $5.25B | 37.30% | +8.00% |
Source: Trepp, September 25, 2026.
The >10 point bucket is the surveillance priority: 18.3% of balance with the weakest occupancy trajectory, even though median NCF in that bucket is still +2.10% versus securitization.
Why Has Cash Flow Outrun Occupancy?
Trepp points to capital structure, not operating miracles:
- Fixed-rate loans represent 88% to 96% of balance in each occupancy bucket.
- Median principal paydown since securitization is zero.
- Interest-only structures range from 63.0% of the deepest-decline bucket to 82.5% in the shallowest-decline bucket.
Properties with the largest occupancy declines often carry the lowest in-place coupons, cushioning today's debt service coverage. Median fixed coupons on loans securitized in 2025 and 2026 were 6.20% and 6.01%, versus 3.47% in 2021 and 4.10% in 2022, per Trepp.
That gap explains why July's Trepp CMBS watchlist narrative focused on demand and supply, while September's note focuses on coupon reset math. Occupancy softened. Coupons did not, yet.
What Happens at a 6.50% Refinancing Coupon?
Trepp stress-tests $7.84 billion where both DSCR and coupon data exist. Holding loan balances constant, restating debt service at an illustrative 6.50% coupon:
| Occupancy bucket | Median coupon | Median DSCR today | Share below 1.0x today | Median DSCR at 6.50% | Share below 1.0x at 6.50% |
|---|---|---|---|---|---|
| Down >10 pts | 4.06% | 1.84x | 1.10% | 1.24x | 20.20% |
| Down 5-10 pts | 4.50% | 1.93x | 5.10% | 1.46x | 10.80% |
| Down 0-5 pts | 4.90% | 1.95x | 0.90% | 1.51x | 10.30% |
| Flat or higher | 5.00% | 1.75x | 2.50% | 1.51x | 11.90% |
| All stress-testable | 4.76% | 1.87x | 2.30% | 1.50x | 13.20% |
Source: Trepp, September 25, 2026.
At 6.50%, 13.2% of stress-testable balance falls below 1.0x DSCR, up from 2.3% today. The >10 point occupancy bucket jumps from 1.1% to 20.2% sub-1.0x.
Trepp is explicit: this is a debt service sensitivity, not proof that 13.2% of loans cannot refinance. The model ignores proceeds, LTV hurdles, reserves, amortization resets, and extension options.
It still identifies where surveillance should start: loans with occupancy and NCF erosion plus 2021-2022 coupons facing maturity walls in a 5.4% cap-rate world described by Colliers in September.
How Does This Square With September Operating Data?
Public-market operators report stabilizing occupancy and improving move-in rates on earnings calls. Yardi Matrix's September national bulletin still shows advertised rates down 1.9% year over year in August 2026.
Trepp's CMBS lens is collateral-specific:
- Many loans were securitized at peak occupancy assumptions in 2021-2024 vintages.
- Sun Belt supply continues to absorb through private balance sheets even as REITs raise guidance.
- Interest-only debt hides weakness until refi repricing.
Transaction volume confirms capital is still moving. U-Haul closed on Wantage, New Jersey, the same week. Andover crossed 100,000 units. Buyers underwrite forward operations, while CMBS investors underwrite legacy coupons.
What Should Owners and Lenders Do With the Data?
Do not trust headline DSCR alone. Trepp's median 1.87x today becomes 1.50x at 6.50% on the same balance.
Segment by occupancy delta. The >10 point bucket drives the sub-1.0x tail at 20.2% under stress versus roughly 11% in other buckets.
Pair Trepp with local rate data. National occupancy stabilization does not erase MSA-level oversupply still weighing on 2023-2025 deliveries highlighted in Trepp's earlier delivery forecast coverage.
Plan extensions early. If proceeds are constrained, the fight is term and amortization, not pretending 3.47% coupons repeat in 2026.
The Numbers Worth Writing Down
- $14.08B: occupancy-matched securitized self-storage balance in Trepp's September 25 sample.
- 62.7%: share backed by lower occupancy versus securitization.
- 35.3%: share backed by properties down >5 occupancy points.
- 90.5% → 87.0%: median occupancy then versus now.
- +4.9%: median NCF change across the NCF-measurable population.
- 2.3% → 13.2%: share of stress-testable balance below 1.0x DSCR before versus after a 6.50% coupon restatement.
- 20.2%: sub-1.0x share in the >10 point occupancy bucket under 6.50% stress.
Coupons Expire Faster Than Occupancy Recovers
Trepp's September 25 note is the credit-market mirror of a sector calling 2026 stabilization, not recovery. Cash flow looks fine until you reprice debt at today's curve.
Owners with clean operations but 2021 coupons should not confuse median NCF gains with refi certainty. Lenders already know where the tail lives: occupancy down double digits, coupons near 4%, and balances untouched since securitization.
Equity keeps buying assets like Wantage and compiling 100,000-unit private portfolios. CMBS investors should spend September reading Trepp, not the REIT press release alone.
Sources
- Occupancy Has Broadly Declined Across Securitized Self-Storage Properties, but Refinancing Risk Remains Concentrated, Trepp, September 25, 2026
- Yardi Matrix September 2026 Advertised Rates, Your CAIO
- Colliers and Green Street Progress Not Recovery, Your CAIO
- Trepp Self-Storage Deliveries 19.6% Decline, Your CAIO