Defining the Product
Small bay industrial describes a specific format of multi-tenant industrial real estate: buildings subdivided into individual units that are small enough to serve one-person operations, small trade businesses, or local light manufacturers, typically 1,000 to 5,000 square feet per unit. Each unit operates independently, with its own entrance, its own overhead door, and usually its own utility metering.
The term "bay" comes from the structural module, a column-to-column span of the building's frame. In practice, a "bay" in the small bay context means a self-contained leasable unit with grade-level overhead door access. A building of 30,000 square feet might contain 15–25 individual bays, each rented to a different business.
The defining features that separate small bay from other industrial formats:
- Grade-level overhead doors: Every unit has at least one door that opens at slab level, allowing vehicles, equipment, and materials to move in and out without a dock plate or forklift. This is functionally critical for the primary tenant base, tradespeople, contractors, and small manufacturers who work with vehicles and move things constantly.
- Unit size under 5,000 sq ft: Small bay units fit the needs of businesses that don't require large footprints but absolutely need industrial functionality. Units under 1,000 sq ft exist but are rare; most of the market clusters between 1,200 and 3,500 sq ft.
- Clear height of 12–18 feet: Tall enough to store equipment vertically, fit a box truck inside, or run a small mezzanine. Not the 30–40 foot clear heights required by distribution centers.
- Basic utility infrastructure: 200–400 amp single or three-phase electrical service, floor drain, natural gas stub. Not the heavy power or specialized infrastructure that advanced manufacturing requires.
A Brief History of the Product Type
Small bay industrial has existed as long as suburban industry has existed. In the postwar period, as American cities pushed outward and trade businesses followed their customers to the suburbs, the need for affordable, functional workspace grew alongside the population. Industrial parks with rows of small units, often simple metal buildings or tilt-up concrete, proliferated through the 1960s, '70s, and '80s.
Most of the small bay inventory that exists today was built during this period. That means a significant portion of America's small bay stock is 40–60 years old, aging infrastructure with low clear heights (sometimes as low as 10–12 feet), inadequate power, poor drainage, and deferred maintenance. This obsolescence is part of what creates the current opportunity: functional new product commands meaningful rent premiums over aging stock, and new supply remains limited.
The institutional real estate industry largely ignored small bay through this entire period. The management intensity required, many tenants, shorter leases, higher turnover than big-bay, made it unattractive to large REITs and institutional investors who preferred the simplicity of single-tenant or large-tenant leases. Small bay remained a cottage industry, dominated by local operators and family-owned parks.
Beginning around 2015 and accelerating through the pandemic period, institutional attention began to turn. The durability of demand, the low vacancy rates, and the favorable rent growth dynamics attracted interest from larger players. But the management burden remains real, and most institutional capital has stayed at arm's length. This continues to leave the small bay market largely in the hands of local and regional operators, like Dymaxion.
How Small Bay Differs from Other Industrial Formats
Big-Bay / Bulk Industrial
Big-bay industrial buildings are designed for large-scale distribution and manufacturing. Typical characteristics: 100,000–1,000,000+ square feet, 28–40 foot clear heights, dock-high loading (usually 4+ feet off the ground), heavy electrical infrastructure, and large trailer courts. Tenants are typically large corporations, Amazon, auto suppliers, regional distributors, operating on long-term leases (10–20 years). These buildings are bought and sold by institutional investors at tight cap rates because the credit of the tenants is well-understood. Small bay serves an entirely different market and is not a substitute.
Flex Industrial
Flex industrial, also called "flex space", is a hybrid format with a higher proportion of finished office space than true industrial. A typical flex building might be 50% climate-controlled office and 50% open warehouse or light industrial space. Flex tenants skew toward tech, light assembly, R&D, and professional services that need both office and some operational space. Clear heights are often lower than true industrial (12–16 feet), and finishes are higher. Flex commands higher rents than small bay but serves a different tenant profile. There is some overlap in tenant type at the margin, but small bay's core tenants, contractors, fabricators, rarely want or need significant office space.
Self-Storage
Self-storage is sometimes confused with small bay because the physical format has surface similarities: small units, many tenants, grade-level roll-up doors. But self-storage is purely for passive storage, not for running a business. Tenants don't occupy the space; they store things in it. Small bay industrial units are workspaces where businesses operate daily. This distinction matters for zoning, financing, and investment analysis.
Physical Characteristics in Detail
Bay Size and Configuration
Standard small bay units range from 1,000 to 5,000 square feet, with the most liquid market segment sitting between 1,500 and 2,500 square feet. Smaller units (under 1,000 sq ft) can work in dense urban markets where land is expensive and small operations cluster, but they're harder to finance and attract a narrower tenant base. Larger units (3,000–5,000 sq ft) can accommodate small manufacturing operations but begin to compete with larger single-tenant industrial, which typically has better clear heights and loading.
Building configurations vary: some small bay parks are single-story rows of units facing a parking and access drive; others are L-shaped or U-shaped around a courtyard. Multi-building campuses are possible on larger sites and allow phased development. The ideal configuration maximizes the number of units with direct outdoor access, each tenant wants to be able to pull a truck up to their door without navigating through another tenant's space.
Clear Height
Clear height, the usable vertical space from finished floor to the lowest hanging obstruction (usually the bottom chord of a roof truss), is one of the most important functional specs. Small bay product in the 12–14 foot clear range is the most common. Buildings with 14–16 foot clear heights command premium rents and attract a slightly broader tenant base, particularly auto-related businesses that need to lift vehicles. Anything above 16 feet in a small bay context is unusual and typically signals that the building is designed for heavier industrial use.
Overhead Doors
Grade-level overhead doors are non-negotiable in true small bay industrial. Standard door sizes range from 8x8 feet to 12x14 feet. Width matters for vehicles (a van typically needs a 9-foot-wide door); height matters for tall equipment and vehicles. Some premium small bay units include two doors per bay, one for vehicles, one for walk-in access or secondary vehicle entry.
Power and Utilities
Small bay units typically include 100–200 amp electrical service per unit, with 200-amp three-phase service available in newer or purpose-built buildings. Natural gas stubs are common in markets with cold winters. Plumbing varies, basic bathrooms are standard, but in-unit floor drains and utility sinks are a meaningful amenity that many older buildings lack. Modern small bay developments should include at minimum: one bathroom per unit (or shared facilities), floor drain, natural gas stub, and 200-amp electrical with the ability to upgrade.
Where Small Bay Gets Built
Location is one of the key success factors for small bay industrial. Unlike big-bay distribution, which prioritizes freeway access and proximity to transportation infrastructure, small bay's primary audience, local trade businesses and contractors, prioritizes proximity to their customer base. A plumber serving the northwest side of a metro area wants a shop in the northwest part of that metro, not 30 miles away in a logistics corridor.
The best small bay locations share several characteristics:
- Infill or close-in suburban: Near established neighborhoods where the tenant's customer base lives. Not fringe exurban land, where it's cheap but far from where the work is.
- Industrial zoning already in place: Entitlement risk is one of the biggest development risks in small bay. Sites with existing I-1 or I-2 (or equivalent) zoning can often move to permits much faster than sites requiring a rezoning.
- High-traffic road frontage or visibility: Many small bay tenants value signage and visibility, it's how they get walk-in customers and maintain a local brand presence.
- Secondary markets with supply gaps: Smaller cities, regional metros, county seats, mid-sized Midwest cities, often have persistent small bay demand with very little new supply. These are Dymaxion's target markets.