Underwrite self-storage from revenue per occupied and available square foot, not from occupancy alone: compare street rates with in-place rates, measure economic occupancy, test new supply in the trade area and reset taxes and management for a new owner. A spreadsheet or Titleman's underwriting from the rent roll and T-12 handles the model; a storage market study or an operator's revenue data fits better for street rate and supply evidence.
Updated 19 October 2026. Published by Titleman, which makes one of the tools compared.
What makes storage different
Customers rent month to month, so the rent roll can reprice inside a year. Income depends on rate increases on existing customers, move-in discounts and new space nearby. Physical occupancy can look strong while revenue lags.
The underwriting checklist
- Unit mix: sizes, climate-controlled share, drive-up versus interior, and vehicle or boat parking.
- Physical occupancy by unit count and by square feet.
- Economic occupancy: collected rent divided by potential rent at street rates.
- Street versus in-place rates by unit type.
- Concessions and bad debt from the T-12 by month, plus auction activity.
- Other income: tenant protection, retail sales, truck rental.
- Supply: facilities opened or planned within the trade area, usually a few miles.
- Expenses reset: property taxes after the sale, insurance, payroll, marketing and a market management fee if the seller self-manages.
- Capital: roofs, doors, paving and gates.
- Exit: a cap rate from sales of similar facilities (what a cap rate is).
A quick example
For example, an illustrative 600-unit facility with an average street rate of 120 dollars a month. Potential rent is 72,000 dollars a month. 540 units are occupied, so physical occupancy is 90 percent. Those customers pay an average of 115 dollars, or 62,100, and concessions and bad debt take 5,400, leaving 56,700 collected. Economic occupancy is 56,700 / 72,000, about 79 percent. The 11-point gap is the first question for the seller. Check the debt side with break-even occupancy.
Tools for each part
| Option | Best for | What it does | Where it stops | Pricing model |
|---|---|---|---|---|
| Spreadsheet | A single facility | Unit-mix revenue and a pro forma | Manual input from management reports | Staff time |
| Storage market study or operator data | Street rates and supply | Rates by unit type and new projects nearby | Not a full underwriting model | Per report or subscription |
| Titleman | A deal or loan request | Underwrites the property from the address, rent roll, T-12 and OM in live Excel | Not a revenue management system | Per run; terms on a demo |
Where Titleman fits
Titleman's underwriting reads the rent roll, T-12 and OM, checks them against each other and the market, and returns a memo with a live Excel model: pro forma, debt, returns and sensitivity grids. The median run took about 58 minutes in the 30 days to 18 October 2026. Name the street-rate and unit-mix figures you want in the brief; a missing figure is named. More on the category: AI real estate underwriting software. See it on your deal: request a demo.
FAQ
What is economic occupancy in self-storage?
Rent actually collected divided by the rent the facility would earn if every unit were rented at street rates. It captures discounts, below-street legacy rates and bad debt that physical occupancy hides.
Why do street rates and in-place rates differ?
Operators often discount to fill units and then raise rent on existing customers over time. So in-place rates can sit above or below the advertised street rate, and the pro forma should model both.
How do I check new supply?
List facilities opened recently and planned within the trade area and compare added square feet with households. A storage market study is the usual source.
Can Titleman underwrite a self-storage facility?
It underwrites the property from the address plus the rent roll, T-12 and OM, with a live Excel model. It does not set street rates or run revenue management, and it gives no buy or sell verdict.