Marblehead office strengthens firm’s presence across Greater Boston and the North Shore
Gibson Sotheby’s International Realty today announced its acquisition of Sagan Harborside Sotheby’s International Realty, a respected brokerage serving clients throughout Marblehead, Swampscott, and communities across the North Shore of Massachusetts. The acquisition establishes Gibson Sotheby’s International Realty’s 34th office at 1 Essex Street in Marblehead. Advisors from the firm’s Marblehead and Swampscott offices will join the Marblehead location.
Sagan Harborside Sotheby’s International Realty was formed in April 2018 through the merger of Sagan Realtors, founded by Phyllis Sagan in 1983, and Harborside Sotheby’s International Realty. Its 40 real estate advisors will join Gibson Sotheby’s International Realty, while partners Phyllis Sagan, Julie Sagan and Shari Sagan McGuirk will continue serving clients as advisors with the firm.
“We’ve admired the Sagan Harborside Sotheby’s International Realty team for many years and have always had tremendous respect for the business they’ve built throughout the North Shore,” said Nicole Rideout Hartwick, president of Gibson Sotheby’s International Realty. “Bringing our firms together strengthens our presence in a market that’s incredibly important to us while creating new opportunities for our advisors and enhancing the experience they provide to their clients.”
As the real estate industry continues to evolve, Gibson Sotheby’s International Realty has invested in a comprehensive advisor platform that includes marketing, technology, business development, education, and operational support, equipping advisors to better serve their clients and grow their businesses.
“The North Shore has long been an important part of Gibson Sotheby’s International Realty’s footprint, and Sagan Harborside Sotheby’s International Realty has been a trusted name in Marblehead, Swampscott, and beyond for many years,” said Larry Rideout, chairman and founder of Gibson Sotheby’s International Realty. “Together, we’re building an even stronger company while remaining committed to the clients and communities we serve.”
“Our clients have always placed their trust in us because of our local expertise, enduring relationships, and deep roots in the North Shore communities,” said Phyllis Sagan, partner/broker at Sagan Harborside Sotheby’s International Realty. “Joining Gibson Sotheby’s International Realty allows us to build on that foundation with an expanded platform that elevates the service our advisors deliver to every client.”
Led by Chairman and Founder Larry Rideout, Principal and Founder Paul McGann, Chief Executive Officer Colleen Barry, and President Nicole Rideout Hartwick, Gibson Sotheby’s International Realty reported $4 billion in sales volume in 2025, making it the #1 Massachusetts-based real estate brokerage by sales volume. The firm has continued that momentum in 2026, achieving $2.23 billion in sales volume during the first half of the year (January 1-June 30, 2026).
For more information, contact Gibson Sotheby’s International Realty at 617.426.6900 or info@gibsonsir.com.
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