Extra Space Storage Inc. (EXR) stock intrinsic value fair value estimate & owner earnings analysis

Extra Space Storage is the largest self-storage owner and operator in the United States. At the end of 2025 it owned or operated 4,281 stores with about 330 million rentable square feet in 43 states and Washington, D.C., and it managed another 1,856 stores for other owners. Customers rent on month-to-month terms. Occupancy on its stabilized stores averaged 93.7% in 2025, and customers who moved out had stayed about 17 months on average. The company also reinsures the insurance tenants buy for their stored goods, earns fees for managing stores, and lends to other storage owners through a bridge-loan program ($1.5 billion outstanding). In July 2023 it merged with Life Storage in an all-stock deal. That roughly doubled the business, so we measure its earning power from 2023 on. How we measured earnings. We start with operating cash flow. We take out working-capital timing swings and stock-based pay, which we treat as a real cost, and then subtract what it costs to keep the stores in shape. The company does not report maintenance spending on its own in the annual report. It reports one line that combines store purchases with improvements to stores it already owns. We subtracted the disclosed cash paid for store purchases and treated everything left over, plus equipment, as spending on existing stores. That leftover also includes raw land and some value-add projects, so this is a cautious choice. On that basis, owner earnings were about $6.85 per share in 2023, $7.51 in 2024 and $6.53 in 2025. The 2025 drop comes almost entirely from that spending more than doubling to about $386 million. Cash flow before that spending rose about 1%. We anchor on the median of 2023-2025, $6.85 per share. We exclude 2022 ($7.66) because it reflected the pandemic-era jump in storage rents (same-store revenue rose 17.4% that year) at a smaller, pre-merger company. Large non-cash charges are added back: real estate depreciation of $700-780 million a year, amortization of the discount on the Life Storage bonds, and a $52 million write-off of the Life Storage trade name in 2024. The bond-discount add-back hides a real future cost, since those bonds will be refinanced at today's rates. We charge that in the growth path below, not in the starting earnings. What is happening now. Store-level results have gone flat. In 2025, same-store revenue rose 0.1% while operating costs rose 4.9%, led by property taxes (+7.6%), so same-store net operating income fell 1.7%. Year-end occupancy slipped from 93.3% to 92.6%, and average rent per occupied square foot eased from $19.99 to $19.91. New customers are signing at about $13.16 per square foot, far below what existing customers pay. Revenue holds up only because the company keeps raising rents on customers who stay. In the first half of 2026, operating cash flow before working-capital timing was up less than 1% from a year earlier, but spending on existing stores fell from about $186 million to $134 million. That drop is why we expect owner earnings to grow again in 2026 after falling 13% in 2025. We still assume only 2% growth in year one. Debt. Total debt was $13.5 billion at the end of 2025, at an average rate of 4.3%. The company's newest bonds (due 2034-2035) carry coupons of 5.35-5.40%. As older, cheaper debt matures over the coming decade, interest costs rise by roughly $130-150 million a year once it has all rolled over, about $0.65 per share. This is built into every case. Debt was about 32% of total enterprise value, and the company funds itself in the investment-grade bond market. Base case, about $181 per share. Owner earnings grow 2% in year one, then 2.5% a year through year ten. That reflects rent increases on month-to-month leases over time, occupancy staying in the low 90s as it has for a decade, and a steady drag from refinancing. It assumes no growth from acquisitions, because nearly all cash flow is paid out as dividends ($1.37 billion in 2025). Growth through acquisitions has to be funded with new shares or debt, and we do not assume it adds value per share. After year ten, the stores are still standing and still rented: the maintenance spending we deduct keeps them in service, and month-to-month leases let rents keep pace with inflation. So we carry earnings forward at 2% a year. Much of the value sits in those later years, which is normal for long-lived real estate. It also means the result is sensitive to that assumption. Bear case, about $124 per share. Spending on existing stores stays at the 2025 level, so the starting point is $6.53. The 2025 pattern of flat revenue and rising property taxes continues, and earnings fall 2% a year for three years as debt reprices higher. Growth then recovers to only 1.5% a year, and just 1% after year ten. Leverage makes this downside worse, but at about a third of enterprise value it does not put the business at risk. Bull case, about $258 per share. Spending on existing stores falls back toward the 2023-2024 level, as the first half of 2026 suggests, putting the starting point near $7.40. Earnings grow 5% in year one and 4.5% a year through year ten. Rents rise as occupancy holds, and the company keeps turning its managed stores and bridge loans into accretive purchases, as it did before 2020, when owner earnings per share grew from $3.25 in 2016 to $4.58 in 2019. Growth after year ten is 2.5%. What would make this wrong. The biggest single judgement is maintenance spending. The filings do not separate true upkeep from land purchases and upgrades, and each $100 million a year moves value by roughly $25-30 per share. The second is whether rent increases on existing customers keep working while new customers pay about a third less. A sustained fall in occupancy, or any limit on those increases, would push results toward the bear case. The third is refinancing: if rates on new debt run well above 5.4%, the interest drag is larger than we assume. The margin-of-safety price is about $120, below the bear case. That allows for the heavy reliance on long-dated value, the leverage and the uncertainty about maintenance spending; at that price, the starting owner earnings represent a yield of about 5.7%.