The office pipeline is reopening—but cautiously
Office construction is beginning to move again in select U.S. markets, but the latest pipeline data suggests that developers are not making broad bets on a return to pre-pandemic demand.
Instead, new projects are increasingly being built around signed tenant commitments.
That distinction matters for passive commercial real estate investors. A new office building with a major tenant already committed has a very different risk profile from a speculative project that must lease hundreds of thousands of square feet after completion.
According to Colliers’ third-quarter review of leading U.S. office markets, more than 24.1 million square feet is under active construction or renovation, with 55.5% of that space preleased. Nine projects that broke ground during the third quarter represented 5.2 million square feet and were 77.2% preleased.
The data points to a selective return of office development—not a broad revival of speculative construction.
Why preleasing has become the dividing line
Office development has always benefited from preleasing, but the requirement has become more important as financing costs, construction expenses and leasing uncertainty have increased.
A developer with a signed lease can offer lenders a more credible revenue stream, reduce lease-up risk and provide greater visibility into the project’s ability to support debt. Without that commitment, the underwriting becomes much more dependent on assumptions about future job growth, tenant demand and rental-rate expansion.
Those assumptions are difficult to defend in many office markets.
Colliers’ data shows a substantial difference between tenant-backed and speculative projects:
- Build-to-suit projects are 96% preleased.
- Speculative new construction is 38% preleased.
- Speculative office renovations are only 14% preleased.
That gap explains why the current construction cycle is concentrated in build-to-suit facilities, corporate expansions and highly amenitized projects aimed at a narrow group of creditworthy tenants.
For investors, the key question is not simply whether a market has office construction underway. The more important question is how much of that pipeline is supported by leases, who the tenants are, and when those leases begin contributing to cash flow.
Large tenants are driving the new supply
The commitments supporting the current pipeline are concentrated among large users. Colliers reports that tenants leasing more than 50,000 square feet account for 92% of the preleased space in the markets it tracks.
Financial, insurance, real estate and professional-services firms represent 57.5% of that large-tenant commitment, or approximately 7.1 million square feet.
That concentration helps explain why Manhattan has the largest active pipeline. The market has 10.6 million square feet under construction or renovation, with 66.5% preleased. Two projects that began construction during the third quarter were fully committed, including developments associated with BNY Mellon and American Express.
Silicon Valley shows a similar pattern. The market’s three projects under construction total 933,000 square feet and are fully committed, including expansions involving NVIDIA and Intuitive Surgical as well as a build-to-suit facility for Arista Networks.
This is not the same as saying that office demand has broadly normalized. It suggests that certain companies, industries and locations still have enough demand to justify new space—even while the broader market continues to carry elevated vacancy.
The pipeline is highly uneven by market
National averages can obscure the level of risk facing individual projects.
South Florida, for example, has 4.1 million square feet across 24 projects in the pipeline, but only 30.3% is preleased. The two projects that broke ground in the third quarter, totaling 192,000 square feet, remained entirely available at the time of the report.
Dallas-Fort Worth has 3.1 million square feet underway across 13 projects, with 53.2% preleased. Denver’s eight projects total 954,000 square feet but are only 20.5% preleased.
Those markets may still offer long-term growth opportunities, but their projects carry more lease-up exposure than the fully committed developments in Manhattan or Silicon Valley.
The distinction is especially important for passive investors evaluating funds, joint ventures or syndications. Two office investments may both be described as “new construction,” while one has a national-credit tenant signed for most of the building and the other depends on leasing activity that may not materialize until after delivery.
Downtown supply is not automatically a positive signal
The current pipeline is also concentrated in downtown locations. Downtown projects account for 75.3% of the total active pipeline and are 57.1% preleased, compared with 50.7% for suburban projects.
That concentration reflects where large corporate tenants, financial firms and specialized users often want to locate. It may also reflect the availability of infrastructure, transit and high-end amenities that are difficult to replicate elsewhere.
But downtown concentration does not eliminate risk.
Office investors still need to evaluate tenant behavior, commuting patterns, building quality and the competitive supply scheduled to deliver at the same time. A well-located tower can outperform its submarket, but it may still face significant concessions if several new projects arrive together.
Nearly 40% of the active pipeline—18 buildings totaling 9.6 million square feet—is expected to be completed in 2028. That creates a future supply checkpoint for investors underwriting office properties today.
What passive investors should watch
The most useful indicators over the next several quarters are likely to be project-level rather than headline market statistics.
1. Preleasing at groundbreaking
Projects breaking ground with substantial tenant commitments are generally easier to underwrite than projects relying on future demand. Investors should distinguish between signed leases, letters of intent and informal tenant interest.
2. Tenant concentration
A fully leased building is not risk-free if one tenant represents most of the rent roll. Investors should review lease expiration dates, renewal options, credit quality and the tenant’s actual space needs.
3. Delivery timing
A project scheduled for completion in 2028 may face a very different leasing environment than one delivering next year. Construction delays, tenant build-out schedules and competing projects can all affect stabilization.
4. Market-level exposure
The current data shows major differences between markets. A portfolio concentrated in heavily preleased gateway projects may have a different risk profile from one focused on speculative Sun Belt office construction.
5. Financing assumptions
Even with strong leasing, construction costs and borrowing rates can pressure returns. Investors should examine interest reserves, completion guarantees, contingency budgets and the amount of lease-up capital required after delivery.
The larger takeaway
The office market is not moving in one direction.
Some assets are gaining traction because they offer the quality, location and tenant experience that companies are willing to pay for. Some new developments are proceeding because a large occupier has already committed to the building. At the same time, speculative office construction remains constrained by uncertain demand and expensive capital.
For passive investors, that creates both an opportunity and a warning.
The opportunity is that limited new supply could eventually support well-located, high-quality buildings as tenant demand improves. The warning is that not every project labeled “Class A,” “urban” or “new construction” has the same level of leasing support.
In the current cycle, the tenant may be the most important part of the development story. Investors who focus on preleasing, tenant quality and delivery exposure will have a better chance of separating durable office demand from projects that are simply betting on a recovery.
