Digital Realty Trust, Inc. (DLR)

Digital Realty is a landlord, but not of buildings where people work. It owns and leases data centres — the vast, secured facilities filled with servers, networking equipment, power systems, and cooling infrastructure that store data and run cloud computing services. When you upload a photo to Google or stream a video on Netflix, that data is processed and stored in buildings like the ones Digital Realty owns. The company operates data centres across the United States, Europe, Asia, and Australia. It is organised as a real estate investment trust, or REIT, which means it collects rent from customers and returns most of its cash flows to shareholders as dividends. The business is structural: as long as the world keeps generating and processing data, Digital Realty has tenants who need space.

Digital Realty was founded in 2002 by Joshua Mills when the internet was still young and the idea of renting secure, climate-controlled space where companies could house their servers was not yet industrialised. At that time, most companies ran their own servers in their own basements or rented small cages in local colocation facilities — shared buildings where multiple businesses housed equipment in locked cages. Digital Realty saw an opportunity: build large, purpose-built data centres in strategic locations, run them to high standards of reliability and security, and lease the space to companies that did not want to build and maintain their own. The economics were sound. A data centre is expensive to build but cheap to operate, and once it is full of paying tenants, the cash flows are durable and recurring.

For the first two decades of its existence, Digital Realty grew steadily, building and acquiring data centres in major cities and internet hubs — Silicon Valley, Northern Virginia (where much of the East Coast’s internet infrastructure clusters), London, Singapore, Tokyo, Sydney, Frankfurt. The company went public in 2004. By 2010, it was a substantial REIT with hundreds of data centres and billions of dollars in assets. But the industry was about to change dramatically.

The rise of cloud computing transformed everything. For the first half of the 2000s, most data processing and storage lived on-premise — that is, in the company’s own offices or data centres. But as cloud providers like Amazon Web Services, Microsoft Azure, and Google Cloud grew, more and more computing shifted to massive, cloud-operated data centres. These cloud providers needed enormous amounts of space and power, and they needed it everywhere — in every major city, every region of the world. Digital Realty was suddenly a landlord not just to small and medium enterprises, but to the largest tech companies on Earth.

This transition accelerated through the 2010s and exploded after 2020. The pandemic forced businesses online, accelerated e-commerce, and drove demand for cloud infrastructure. Video streaming, social media, artificial intelligence training — all of these require vast amounts of computing power housed in data centres. Digital Realty’s facilities filled up. Customers signed multi-year leases locking in rent. The company had to build or acquire new capacity as fast as it could.

Data centre operations are capital-intensive and operationally rigorous. A facility must be secure (it houses equipment worth tens or hundreds of millions of dollars), climate-controlled (servers generate heat and can only operate within a narrow temperature range), and powered by redundant, uninterruptible power (a data centre losing power even for a moment is a disaster for customers). Digital Realty maintains multiple power feeds from the grid, on-site backup generators, and uninterruptible power supplies that can keep equipment running even during a grid failure. It has 24-hour security and surveillance, fire suppression systems, and dedicated staff monitoring every facility around the clock. This complexity is expensive, but it is the cost of doing business. Companies will not house their servers — or their customers’ data — anywhere less than bulletproof.

The company’s revenue comes almost entirely from leasing space, power, and connectivity inside these facilities. A customer pays a monthly or annual rent for a certain amount of rack space — essentially, a secured cage where the customer can install its own servers. They also pay for power consumption (measured in kilowatts and kilowatt-hours) and for connectivity to the internet (bandwidth). Some customers also buy managed services — Digital Realty will physically install, configure, and maintain the customer’s equipment. The revenue is highly recurring: once a customer signs a lease, it usually stays for years and keeps paying month after month.

The gross profit margins in this business are high because the incremental cost of serving an additional customer in an already-built facility is low. The building is already there, the power is already flowing, the security is already in place. Adding one more customer is simply a matter of turning on some additional power circuits and plugging in servers. So once a facility is full, each new megawatt of revenue flows straight down to profit. The challenge is that building a data centre is expensive and capital-intensive. A new facility can cost hundreds of millions of dollars and take years to plan, permit, and construct. So growth requires continuous capital investment.

Digital Realty finances this growth by selling shares and by borrowing. As a REIT, it is required by law to pay out at least 90 percent of its taxable income to shareholders as dividends, so retained earnings cannot fund growth. The company raises capital through a combination of equity offerings, bonds, and bank loans. It also acquires existing data centre companies and their facilities, which is often faster than building from scratch. The company has made several large acquisitions over the years, integrating Equinix’s colocation assets, Telstra’s data centres in Australia, and others.

Competition is real. A few other massive REITs own data centres — Equinix, CoreWeave, and others — and some of the largest cloud providers own and operate their own facilities rather than leasing from third parties. But the largest cloud providers still lease significant space from Digital Realty and others because it is more cost-effective than building everywhere themselves. Digital Realty’s competitive position rests on its scale, its global footprint, and its operational expertise. A company trying to house servers across six continents would rather lease from one experienced operator than negotiate with dozens of smaller landlords.

The longer-term question for Digital Realty is whether the data centre industry continues to grow as fast as the broader tech sector. Artificial intelligence and machine learning are driving new demand for computing power, and the company has invested heavily in facilities designed specifically for AI workloads, which require denser power and cooling than traditional servers. But if cloud providers become more efficient at building and operating their own data centres, or if computing shifts toward edge data centres (smaller facilities distributed geographically), the demand for centralized, hyperscale data centres could flatten. For now, the demand is strong, and Digital Realty is in the position of landlord to the digital economy.

An investor studying Digital Realty (SEC CIK 0001297996) should read the annual 10-K for a breakdown of which customers or customer types account for the most revenue, what percentage of revenue is locked in via long-term contracts, and what capital expenditures the company plans. The company’s dividend is a key part of the return for REIT investors, so watch the payout ratio and the growth in the dividend per share. Track the occupancy rate of the company’s facilities — high occupancy means the buildings are full and pricing power is strong; low occupancy means the company is in growth mode and paying to build capacity it has not yet leased. Nothing here is investment advice, but Digital Realty is a business worth understanding because it is the landlord of the digital infrastructure that everything else relies on.