Self-storage investing: underwrite the business, not just the building

Income is built from the unit mix

Gross potential income is each unit size times its street rate, summed across the mix — a facility heavy in climate-controlled 10×10s and one heavy in 5×5s are different businesses at the same square footage. Two rate numbers matter: the street rate a new tenant is quoted, and the achieved rate existing tenants actually pay after move-in discounts, web pricing and long-tenured tenants sitting below today’s posted price.

Underwrite on achieved; the distance to street is your upside, priced separately.

Go deeper: Expert Insights: How to Analyze Self-Storage Investments

Physical vs economic occupancy

Physical occupancy counts rented doors; economic occupancy counts collected rent against gross potential. A facility can be 92% full and 78% economic once concessions, delinquency and below-street tenants are netted out, and the debt is paid from the economic number.

The gap between the two is usually where the value-add case lives — and where an optimistic pro forma hides.

Other income, expenses and the ratio

Tenant insurance or protection plans, admin fees, late fees and retail sales are real income lines worth modeling explicitly, because they scale with occupancy and management quality. On the expense side — payroll or remote management, property taxes, insurance, marketing, utilities, software — the expense ratio against effective gross income is the cross-check, and a statement that looks lean is often a facility run by an owner who paid themselves nothing.

Go deeper: Real Estate Analysis Software: How to Cash Flow Analysis for Self-Storage

Valuation and revenue per square foot

Storage is valued on income: NOI over a cap rate, like any commercial asset. Revenue per net rentable square foot is the metric that makes facilities of different sizes and mixes comparable — computed on both gross potential and collected income, because the difference tells you whether a weak number means weak rates or weak collections, which are different problems with different fixes.

Value-add and expansion

The classic storage value-add levers are pricing discipline (closing the achieved-to-street gap on a schedule), adding income lines the previous owner never ran, cutting expenses with better management, and — where land and demand allow — expansion of the facility itself. Each is an explicit scenario with a cost and a timeline, and the honest model prices the ramp, not just the destination.

Go deeper: Why Self-Storage Should Be Part of Your Investment Portfolio?