U.S. Industrial Outdoor Storage Gains Institutional Appeal, but Zoning Determines Lasting Value

IOS Is Emerging as an Institutional Asset Class, but the Land Is Only Part of the Investment

Industrial Outdoor Storage has evolved from a fragmented, owner-occupier-oriented property sector into an increasingly recognized component of the U.S. industrial real estate market. The sector’s appeal reflects strong historical rent growth, low vacancy, limited new supply, and its essential role in logistics, construction, equipment rental, infrastructure, and other asset-intensive industries.

According to Newmark and Alterra research, IOS rents increased 123% between 2020 and 2025, compared with 58% for bulk warehouse properties over the same period. National IOS vacancy remained comparatively low at 3.6% in the second quarter of 2026, versus 6.5% for the broader industrial market. Rent growth has moderated from its exceptional post-2020 pace, but the sector’s occupancy advantage continues to attract investors seeking differentiated industrial exposure.

Zoning Is Not Merely a Regulation; It Is a Core Component of IOS Value

IOS properties are unusual because their economic value is driven primarily by the land and the legal ability to use that land for outdoor storage. Buildings are generally limited, with site coverage often below 20% to 25%, and some properties have virtually no structural improvements. As a result, ownership of an IOS parcel does not necessarily provide a durable economic interest in its current use.

If outdoor storage is permitted by right, the property typically has a more defensible leasing and investment position. Risk increases when the operation depends on a conditional or special-use approval, variance, temporary permit, or legal nonconforming status. These approvals or use rights may contain expiration provisions, restrictions on transfer, operating conditions, or limitations triggered by discontinuance, changes in use, or future expansion.

The central underwriting question is therefore not simply whether the parcel is zoned industrial. Investors and appraisers must determine whether outdoor storage is allowed as a principal, accessory, conditional, or nonconforming use, and whether that right is permanent, transferable, enforceable, and capable of surviving changes in ownership or tenancy.

Entitlement Duration Directly Affects Lease Duration and Income Security

Zoning durability becomes especially important when an owner seeks to execute a long-term lease. An IOS tenant is not primarily leasing a building. The tenant is leasing legally usable acreage for truck parking, container storage, equipment staging, construction materials, fleet maintenance, or similar operations.

If the entitlement expires before the end of a proposed lease, neither the landlord nor tenant can confidently treat the site’s outdoor-storage capacity as secure for the full term. That uncertainty can shorten the achievable lease duration, reduce rent, discourage tenant improvements, constrain financing, and weaken the property’s residual value.

The distinction is best understood as a potential loss of use rather than a loss of land. The owner retains the parcel if an IOS entitlement expires or a nonconforming use is extinguished, but the property may lose the economic utility that supported its IOS income. Conversion to another industrial use could require new approvals, capital improvements, environmental work, construction, and substantial downtime. Consequently, two physically similar parcels can have substantially different values solely because one possesses a more permanent entitlement.
Regulatory Barriers Create Risk for Individual Sites but Scarcity for the Sector

The restrictions that complicate IOS ownership also help protect properly entitled properties from new competition. Zoning limitations, community opposition, and redevelopment pressures have constrained purpose-built IOS additions even as bulk warehouse construction expanded rapidly after the pandemic.

This supply divergence is visible in market performance. IOS has generally maintained lower vacancy and stronger rent growth than conventional bulk warehouse properties. Investors surveyed by PwC estimate that approximately 20% of eligible IOS sites may eventually be converted to warehouses, potentially reducing already limited inventory. The continuing loss of viable outdoor-storage land could support a scarcity premium for sites with stable, transferable rights.

Institutional Capital Is Expanding, but Underwriting Must Remain Local

The national IOS market is estimated at approximately $275 billion, with as much as $220 billion considered institutionally investable. Institutional capital represented an estimated 45% of IOS investment in 2026, up from approximately 30% four years earlier, while reported 2025 investment activity totaled approximately $14 billion to $16 billion.

Demand remains diversified across trucking, construction, utilities, equipment rental, building materials, logistics, and fleet operations. Data center development also emerged as a meaningful source of incremental demand in 2026, helping offset softness in portions of the trucking sector. Nevertheless, IOS remains less transparent than traditional industrial real estate, and lease structures, site quality, zoning classifications, and entitlement protections vary substantially among jurisdictions.

The Outlook Favors Properly Entitled Sites, Not IOS Land Indiscriminately

IOS fundamentals remain supported by scarce supply, essential tenant uses, and growing institutional acceptance. However, the sector’s performance should not lead market participants to treat all outdoor-storage properties as equivalent.

For valuation and underwriting purposes, the strength of the IOS right may influence achievable lease terms, tenant investment, renewal probability, financing availability, terminal assumptions, capitalization rates, and value per usable acre. Market participants should monitor zoning compliance, entitlement expiration, transferability, abandonment provisions, redevelopment pressure, and changes in local land-use policy.

KEY MARKET TAKEAWAY:

For Industrial Outdoor Storage (IOS), the core asset is not merely the land, but the land combined with a lasting and transferable legal right to use it for outdoor storage.