CSL Consulting Expands into Southeast with Brownstone Construction Partnership

BURLINGTON, Mass. & COLUMBIA, S.C. — CSL Consulting LLC (“CSL Consulting”), a Burlington, Massachusetts-based owner’s representation and construction management firm, has announced a major strategic expansion into the Southeastern United States through its acquisition of Brownstone Construction Group LLC (“Brownstone”). The move marks a significant milestone in CSL’s growth trajectory as it strengthens its footprint in one of the nation’s fastest-growing regions for education, infrastructure, and healthcare development.

While terms of the transaction were not disclosed, the acquisition represents a long-term commitment to expanding CSL’s program management and construction oversight services to clients throughout the Carolinas, Georgia, and the broader Southeast.

Founded in 2005 by Dale Collier and Darrell Campbell, Brownstone has earned a strong reputation as a trusted owner’s representative and project management firm. Its expertise spans K–12 and higher education, healthcare, municipal, and civil infrastructure projects, supporting clients from the initial planning and design phase through construction and project closeout. Brownstone operates offices in Charleston, Savannah, Charlotte, and Greensboro, giving CSL an immediate regional presence.

“From the beginning, Brownstone was built on the foundation of empowering exceptional talent and delivering sustained value for clients and communities,” said Dale Collier, Co-Founder of Brownstone. “Joining forces with CSL puts us in an excellent position to broaden our impact, deepen our technological and operational capabilities, and tackle larger, more complex projects.”

Co-Founder Darrell Campbell emphasized the alignment between the two companies’ values and missions. “We see CSL as a partner who shares our passion for quality, culture, and long-term client relationships. Together we will preserve what makes Brownstone unique while accelerating growth and expanding service delivery across the Southeastern U.S.”

CSL’s Co-Founders and Principals, Marc Cammarota and Ed LeFlore, underscored how the partnership strengthens both firms’ regional and sectoral capabilities. “The addition of Brownstone marks a major milestone in CSL’s growth journey. Their strong reputation in the public education, municipal, and civil infrastructure sectors complements our own strengths. This acquisition enhances our capacity to serve clients in the Southeast, particularly in the education and healthcare sectors, while maintaining our commitment to delivering projects on time, within budget, and with excellence.”

The acquisition reflects CSL’s broader strategy to expand its geographic reach and service depth while maintaining a client-focused, relationship-driven approach. By combining Brownstone’s established regional presence with CSL’s advanced project management systems and multidisciplinary expertise, the partnership positions both firms to serve the evolving infrastructure and capital development needs of communities across the Southeast.

About CSL Consulting

CSL Consulting is a leading firm offering owner’s representation, project management, and construction oversight services across the Eastern United States. From concept planning and design to closeout and beyond, CSL supports clients in higher education, healthcare, life sciences, infrastructure, and private development sectors. Headquartered in Burlington, Massachusetts, the firm is known for delivering complex, high-value projects on time and within budget through a blend of technical expertise and hands-on collaboration.
🔗 https://www.csl-consulting.com/

About Brownstone Construction Group

Headquartered in Columbia, South Carolina, Brownstone Construction Group provides program management, owner’s representation, and construction oversight services for public and private capital projects. Its portfolio includes public K–12 schools, universities, healthcare systems, and municipal infrastructure, serving clients throughout the Southeast.
🔗 https://www.bstonegroup.com/

Originally reported by CSL Consulting in Construction Dive.