US-based architecture platform firm Stonewall has acquired Delaware practice Architectural Alliance to establish a foothold in the Mid-Atlantic region, according to Business Wire.

The Louisiana-headquartered company expands its services through the partnership with the Wilmington-based firm, which maintains an additional office in Exton, Pennsylvania.

Founded in 1987, Architectural Alliance has built a reputation for delivering client-centred architectural solutions across commercial, residential, institutional, historic, and adaptive reuse projects. The firm has become a trusted partner to developers, municipalities, institutions, and private clients throughout the Mid-Atlantic region.

Ben Moody, co-founder and chief executive of Stonewall, said: "Architectural Alliance represents everything we look for in a Stonewall partner—strong leadership, a legacy of project success, and a proven culture of service."

Architectural Alliance will continue operating under its established brand, led by its current leadership team, ensuring stability, continuity, and uninterrupted commitment to client success. The partnership equips the firm with expanded resources, operational support, and the national platform needed to pursue new opportunities whilst maintaining its boutique service model.

Kevin Wilson, principal of Architectural Alliance, said: "Joining The Stonewall Group opens an exciting and powerful new chapter for our firm. Their investment and operational support allow us to enhance our capabilities while staying true to the mission and culture that have guided us since the 80s."

The acquisition strengthens Stonewall's growing footprint in the Northeast and Mid-Atlantic markets, expanding the platform's capabilities in urban infill, historic restoration, mixed-use development, institutional design, and residential architecture.

Stonewall, headquartered in Lafayette, Louisiana, acquires, invests in, and operates leading architecture firms across the United States, supporting founders whilst preserving firm culture and accelerating long-term growth.

Find comprehensive acquisition details in the full report.