Salas O'Brien Acquires Chavez-Grieves Consulting Engineers

Salas O'Brien Acquires Carolina Engineering Solutions

April 22, 2025

Engineering Services

Salas O'Brien announced that Carolina Engineering Solutions of Greenville, South Carolina has joined the firm, strengthening Salas O'Brien’s mechanical, electrical, and plumbing (MEP) design capabilities. The acquisition expands Salas O'Brien’s capacity to serve education, healthcare, and government clients and enables the combined firm to pursue larger, more complex projects.

Salas O'Brien Acquires FA Engineering

March 24, 2025

Engineering Services

Salas O’Brien has merged with FA Engineering, adding FA Engineering’s industrial engineering, structural and mechanical design, and environmental compliance capabilities to Salas O’Brien’s platform. FA Engineering is based in Pocatello, Idaho and the combined organization expands Salas O’Brien’s capacity to serve industrial end markets including mining, food processing, and waste treatment.

Blackstone Makes Minority Growth Investment in Salas O'Brien

January 22, 2024

Engineering Services

Blackstone (through Tactical Opportunities and affiliated funds) has made a minority structured growth equity investment in Salas O’Brien, an employee-owned engineering and technical services firm headquartered in Irvine, California. The investment will support Salas O’Brien’s continued expansion in the AEC market — enhancing talent, technology resources, and capability to serve decarbonization, energy transition and critical infrastructure projects; Caltius Structured Capital will remain a minority investor alongside Blackstone.

Caltius Structured Capital Invests in Salas O'Brien

October 20, 2020

Engineering Services

Caltius Structured Capital closed a growth capital investment in Santa Ana–based Salas O'Brien to support the firm's national expansion through strategic mergers and organic growth. The structured financing (including junior debt and minority equity) is intended to preserve employee ownership while fueling Salas O'Brien's growth across its facility engineering, construction management, technology and commissioning services.

Salas O'Brien Acquires AME Consulting Engineers

September 11, 2025

Engineering Services

Salas O’Brien has merged with AME Consulting Engineers, a North Carolina-based MEP, fire protection, and technology engineering firm, to strengthen its capabilities across federal, municipal, healthcare, aviation, and education markets. AME brings more than 30 team members and deep experience in complex facility renovations, while the deal expands Salas O’Brien’s technical capacity and regional presence.

Salas O'Brien Acquires RFS Engineering

January 13, 2026

Engineering Services

Salas O’Brien has merged with RFS Engineering, a New England-based MEP/structural/civil engineering firm, integrating RFS’s 100+ professionals and offices in Boston, Laconia (NH), and Portland (ME) into Salas O’Brien’s national platform. The combination broadens Salas O’Brien’s MEP/FP, structural, civil, sustainability, and commissioning capabilities across New England; AEC Advisors acted as exclusive financial advisor to RFS.