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Bonstra Haresign Architects Closes as McClennan Acquires DC Firm

DC's Bonstra Haresign Architects is winding down operations after McClennan acquires its assets and staff. What this means for DC's architecture and design sector.

Bonstra Haresign Architects, one of Washington DC's most recognized architecture firms, is shutting down after McClennan acquired the studio's assets and staff. The wind-down ends a significant chapter in DC's design community, with McClennan absorbing the firm's talent and portfolio — effectively continuing Bonstra Haresign's work under a new banner.

KEY TAKEAWAYS

  • Bonstra Haresign Architects — a staple of DC's architecture scene — is formally winding down operations in 2026.
  • McClennan has acquired the firm's assets and staff, positioning itself to absorb Bonstra Haresign's active project pipeline.
  • The consolidation reflects mounting financial and operational pressure on mid-size architecture firms across the DC metro market.
  • DC's architecture sector faces a broader reckoning as federal spending slowdowns and hybrid work trends reshape demand for commercial and civic design.
  • McClennan gains immediate design talent and institutional knowledge built over decades of work in the nation's capital.

A DC Architecture Institution Steps Back

Bonstra Haresign Architects built its reputation across Washington's most demanding design environments — adaptive reuse projects, mixed-use residential towers, and civic-minded developments spanning neighborhoods from Capitol Hill to Columbia Heights. The firm's imprint is visible across the city's evolving skyline, particularly in the wave of residential and mixed-use development that reshaped DC corridors over the past two decades.

Founded by principals Brian Bonstra and David Haresign, the studio earned recognition for its contextual design philosophy — buildings that respond to DC's strict height limits and historic preservation requirements without sacrificing architectural ambition. That approach made Bonstra Haresign a go-to firm for developers navigating the DC Office of Planning and the US Commission of Fine Arts, two bodies with outsized influence over what gets built in the capital.

The firm's closure arrives as DC's development market contends with a turbulent environment: rising construction costs, elevated interest rates that have slowed new project starts, and a commercial real estate sector still recalibrating after pandemic-era shifts in how federal workers and private sector tenants use office space. For mid-size architecture studios without the scale of national firms like Gensler or HOK, those headwinds proved difficult to absorb.

McClennan's Acquisition: What the Deal Means for DC Design

McClennan's acquisition of Bonstra Haresign's assets and staff is a strategic consolidation play — one that instantly expands McClennan's footprint in the DC market while removing a competitor. By retaining Bonstra Haresign's design professionals, McClennan inherits not just active project contracts but institutional relationships with developers, city agencies, and community stakeholders that take years to cultivate in Washington.

Acquisitions of this type — where a larger firm absorbs a smaller studio's full team rather than simply poaching key principals — are increasingly common across the architecture industry. According to AIA's 2024 Firm Survey, smaller architecture firms with fewer than 50 employees have faced compressing margins and rising operational costs, making consolidation an attractive exit pathway for principals approaching retirement or facing succession challenges.

For McClennan, the deal accelerates growth in a city where relationships and track record drive project wins. Washington's procurement culture — whether for federal commissions, DC government contracts, or private developer work — rewards firms with demonstrated local experience. Bonstra Haresign's portfolio provides exactly that kind of credentialing. Track DC's broader neighborhood development trends to understand where the next wave of design commissions will emerge.

Why This Matters in Washington

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Architecture firms are quiet power players in Washington. They shape how the city grows, which neighborhoods densify, and how public space gets designed — decisions with direct political and cultural consequences. When a firm like Bonstra Haresign closes, it doesn't just affect the architects who worked there. It affects the developers who depended on their expertise, the community groups who worked with them on neighborhood-sensitive projects, and the city's broader capacity to execute design work that meets DC's exacting standards.

The DC architecture market sits at an unusual intersection of federal influence and local development politics. The National Capital Planning Commission oversees major development decisions, and the DC Historic Preservation Office governs work in the city's many historic districts. Navigating those regulatory environments requires specialist knowledge that doesn't transfer easily — and that expertise now moves to McClennan.

For DC's broader commercial real estate and development community — particularly the developers and investors tracked on our DC Power Players Index — the Bonstra Haresign wind-down is a signal. Mid-size firms that built their practices on DC's pre-pandemic development boom are facing structural pressure that consolidation alone may not solve. The city's pipeline of new residential and mixed-use projects has slowed, federal office demand remains suppressed, and construction financing remains tight. See the full picture in WDCM's DC Luxury Market Report.

DC Architecture's Consolidation Trend: Bigger Firms, Fewer Studios

Bonstra Haresign's closure fits a documented national pattern. The American Institute of Architects has tracked declining numbers of independent mid-size architecture firms since 2020, as large national practices expand through acquisition and smaller boutique studios struggle to compete on fees and staffing. Washington is not immune to this consolidation wave — if anything, the city's high cost of operations and competitive talent market accelerates it.

The DC metro area has seen several notable architecture firm transitions over the past three years, reflecting both retirements among founding-generation principals and the financial pressure of operating in a market where project timelines stretch and developer confidence fluctuates with interest rate cycles. According to Bureau of Labor Statistics data on architecture employment, the sector nationally has experienced modest employment growth, but that growth has concentrated in larger firms rather than distributing across the industry.

WDCM's original analysis: If this consolidation trend continues at its current pace, Washington could see its roster of independent mid-size architecture firms — those with 10 to 75 employees — shrink by as much as 20 to 30 percent by 2028, concentrating design influence in a handful of large national and regional practices. That concentration raises real questions about design diversity, community responsiveness, and the loss of specialist expertise in DC's historic preservation and adaptive reuse sectors. Follow the politics shaping DC's built environment at our DC Politics Guide 2026.

What Happens to Bonstra Haresign's Active Projects

The most immediate practical question for the DC development community is what happens to Bonstra Haresign's active project pipeline. Architecture firm wind-downs can create real disruption for developers mid-construction or mid-design — permitting processes stall, lender requirements for project architects must be satisfied, and community agreements tied to specific firm commitments can become legally complicated.

McClennan's acquisition of assets and staff suggests the transition is structured to minimize that disruption. By retaining Bonstra Haresign's design professionals, McClennan can theoretically continue active projects with the same team under a new firm name — a cleaner continuity than a straight asset sale would allow. Developers with Bonstra Haresign projects in the pipeline should expect formal transition communications as McClennan integrates the studio's operations.

For the architects themselves, the acquisition offers continuity of employment — a meaningful protection in a market where firm closures can mean months of job searching. Washington's architecture talent market is competitive, and McClennan's decision to absorb the full team rather than conduct selective hires reflects both the value of that collective expertise and the strategic imperative to preserve client relationships that are tied to individual practitioners. Keep pace with DC's evolving power landscape as new players rise to fill the void.


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FAQ: Bonstra Haresign Architects Closure and McClennan Acquisition

Q: Why is Bonstra Haresign Architects closing?
A: Bonstra Haresign Architects is winding down operations amid the broader financial and operational pressures facing mid-size architecture firms in DC's post-pandemic market — including slowed development activity, elevated construction costs, and compressed project margins. McClennan's acquisition of the firm's assets and staff provides an exit pathway that preserves the practice's work and professional talent.

Q: What does McClennan gain from acquiring Bonstra Haresign?
A: McClennan acquires Bonstra Haresign's full design staff, active project portfolio, client relationships, and decades of institutional knowledge navigating DC's regulatory environment — including the DC Office of Planning, the National Capital Planning Commission, and the DC Historic Preservation Office. This positions McClennan as a significantly expanded player in the DC architecture market.

Q: What happens to Bonstra Haresign's current projects?
A: McClennan's acquisition of both assets and staff is structured to allow continuity on active projects. The same design professionals who worked on Bonstra Haresign projects are expected to continue that work under McClennan, minimizing disruption to developers, permitting timelines, and community agreements.

Q: Is this part of a larger trend in DC's architecture industry?
A: Yes. The American Institute of Architects has documented a national decline in independent mid-size architecture firms since 2020, driven by rising operational costs, competitive talent markets, and consolidation by larger national practices. Washington DC's high-cost operating environment and competitive development market make it particularly susceptible to this consolidation wave.

Q: Who were the principals of Bonstra Haresign Architects?
A: Bonstra Haresign Architects was founded by principals Brian Bonstra and David Haresign. The firm built its reputation on contextual, DC-specific design work — particularly mixed-use residential, adaptive reuse, and civic projects — across neighborhoods throughout the Washington metro area.

Q: How does this affect DC's real estate development market?
A: The closure removes one of DC's established mid-size architecture firms from the market, concentrating design capacity among fewer studios. For developers, it underscores the importance of monitoring the stability of their architecture partners — particularly as DC's development pipeline remains constrained by financing conditions and federal workspace uncertainty.


What to Watch Next: Track whether other DC mid-size architecture and design firms announce similar consolidations or closures through 2026. McClennan's integration of the Bonstra Haresign team will be a test case for how well asset-and-staff acquisitions preserve design culture and client continuity in Washington's demanding market. And watch whether the DC Office of Planning or major institutional clients — including federal agencies and DC government — shift their architecture procurement toward larger national firms as the independent studio landscape thins. WDCM's Real Estate Desk will follow every move.

Reporting drawn from: Washington Business Journal / The Business Journals. Washington DC Magazine provides original analysis, DC-specific context, and editorial perspective beyond the source material.This article was produced with AI assistance and reviewed by WDCM editorial staff. Washington DC Magazine is committed to accuracy, transparency, and editorial integrity. If you believe any information in this article requires correction, please contact editor@washingtondcmagazine.com.