Colocation Data Center Site Selection: Markets, Connectivity and Multi-Tenant Needs

A colocation data center leases space, power, cooling and connectivity to many tenants under one roof. That simple fact changes site selection. A single-user campus is sized and located for one owner’s network; a colocation facility has to appeal to dozens or hundreds of customers it has not yet signed, so it must sit where those customers already want to be.

The market splits into two products. Retail colocation sells racks, cabinets and cages to many smaller tenants. Uptime Institute describes the typical retail model as a fixed fee based on the maximum power capacity supplied and the space used, which bundles the underlying costs into one predictable charge.⁵ Wholesale colocation leases larger dedicated blocks of space and power. TechTarget puts the usual wholesale minimum at around 300 kW, with 1 MW and up as the sweet spot, though thresholds vary by operator,⁸ and wholesale tenants usually manage more of their own IT, capacity planning and connectivity.⁴

The distinction matters for land. A retail facility can work on a few acres in a dense metro if the networks are there. A wholesale or hyperscale-oriented colocation campus behaves more like a single-user campus and needs power at scale. Our guide to site needs by data center type compares the profiles, and build, lease or colocate covers the decision from the tenant’s side.

Colocation is a metro business. Synergy Research Group found that in the second quarter of 2020 just 25 metro areas accounted for 65% of worldwide retail and wholesale colocation revenue, with Equinix, Digital Realty and NTT the three largest providers.¹ Those shares shift over time, but the pattern holds: customers want their equipment within driving distance of their staff and within a short network path of their users, partners and cloud providers.

Tight supply reinforces the pull of established markets. CBRE reported that vacancy across primary North American markets held at 1.4% in the first half of 2026, that Northern Virginia’s vacancy fell to 0.2% on 467.6 MW of absorption, and that more than 80% of capacity under construction was already preleased.² JLL’s midyear 2025 report put overall vacancy at 2.3% and said colocation vacancy had dropped below 1% in the largest markets.⁹

For a site screen, this means a parcel inside or next to a recognized market is usually worth more to a colocation operator than a cheaper parcel two hours away, even with identical power. Operators extend outward from existing campuses along fiber routes and utility corridors, so proximity to existing colocation inventory is itself a signal. Our guides to major U.S. data center markets and vacancy, absorption and pricing track where that demand is concentrated.

For retail colocation, connectivity is the product. Customers pay a premium to sit in a building where they can link directly to carriers, cloud providers and each other. Equinix’s annual report describes its interconnection offerings as connecting businesses within and between its data centers, and its Equinix Fabric service as giving customers access to thousands of networking, storage, compute and application service providers.⁶ Those links are typically physical cross-connects, sold as a separate line item in retail contracts.⁴

That ecosystem is hard to replicate on a new parcel. It grows around carrier hotels and internet exchanges over many years, and new facilities compete by being close to them. A greenfield retail site should be screened for the number of carriers that can reach it, the distance and path to the nearest major interconnection hub, and whether diverse fiber routes enter from separate directions. See internet exchange points and carrier hotels and fiber route diversity and latency.

Wholesale sites lean less on in-building ecosystems. Historically, wholesale operators left connectivity to the tenant, who often brings dark fiber or multiple cross-connects to its own network, while retail operators built interconnection into their business model.⁴ The line is blurring as operators add interconnection to large campuses, but for wholesale the fiber question is mainly whether several providers can deliver diverse routes, not how many networks are already inside.

Colocation contracts are now written around power more than space. AFCOM’s categories, as summarized by TechTarget, treat more than 16 kW per rack as extreme density, and colocation executives describe customer conversations that revolve around power rather than square footage.¹¹ AFCOM’s 2026 State of the Data Center survey reported average rack density rising from 16 kW in 2025 to 27 kW in 2026.¹² A multi-tenant building designed for single-digit kilowatts per rack may not satisfy AI tenants without new electrical and cooling capacity; see high-density GPU racks and site power.

The harder problem is getting utility capacity at all inside a constrained metro. Bloomberg reported in late 2025 that a Digital Realty building in Santa Clara, applied for in 2019, still sat as a shell awaiting full energization about six years later, and that a nearby 48 MW Stack Infrastructure project was also vacant while the local utility upgraded its system.⁷ Northern Virginia has its own well-documented delays; see the Northern Virginia market.

Prices reflect this scarcity. CBRE’s H2 2025 survey put the average asking rate for a 250–500 kW requirement in primary wholesale markets at a record $196.25 per kW per month, up 6.6% from a year earlier, while pricing for 3–10 MW requirements rose 12.5%.³ JLL’s year-end 2025 report said rents were up about 60% since 2020.¹³ For a site seller, the implication is that a metro parcel with a credible, dated utility commitment is far more valuable than one with only a request in the queue. Our guides to energization timelines and powered land explain what counts as credible.

A colocation building serves tenants with different security, compliance and density requirements, and several of those needs show up in the site plan rather than only inside the building.

• Market-standard redundancy: CBRE quotes its benchmark rents for N+1, Tier III-type requirements, which signals the baseline most tenants expect.³ That means room for redundant utility service, generators and cooling plant. See tier levels and redundancy.
• Separate customer access: many tenants send their own staff and vendors, so the site needs controlled visitor entry, loading and parking that do not compromise the secure perimeter.
• Phased, divisible capacity: operators build in phases and lease by the suite or hall, so the parcel should accommodate several buildings or a large multi-story structure added over time.
• Height and density: where land is scarce, operators build up. Vantage began a four-story data center in supply-constrained Santa Clara.¹⁴ Check height limits and floor-area rules before assuming a small metro lot can hold enough megawatts.
• Diverse fiber entries: at least two physically separate building entrances for fiber, ideally reached from different streets.

These features favor rectangular, flat parcels in industrial or employment zoning with good road access and room for phased expansion. Odd-shaped or residentially bordered lots can still work for small retail buildings, but generator noise and height limits often become the issues neighbors raise first; see data center zoning ordinances.

The screen for colocation reverses the usual hyperscale order. Start with market and network position, then confirm that power can arrive on a schedule a multi-tenant operator can lease against.

1. 01Map existing colocation inventory, carrier hotels and cloud on-ramps in the metro, and place the parcel against them.
2. 02List the fiber providers that can serve the parcel and confirm route diversity, not just presence. See fiber connectivity for data center sites.
3. 03Ask the utility for available capacity, the phasing it can offer and the dates it will commit to in writing.
4. 04Check zoning use tables, height limits and floor-area rules to confirm how many megawatts the lot can physically hold.
5. 05Decide whether the site suits retail, wholesale or both, because that determines which operators and tenants to approach.

A parcel that fails as a hyperscale campus can still be a strong colocation or edge site, and the reverse is also true. If you are weighing a metro property, we can get a site reviewed against these criteria.