About Robertson

Meet Robertson Allen

A Charleston native with a lifelong passion for the Lowcountry, Robertson Allen has set the standard for luxury real-estate excellence across Charleston County. With more than two decades of experience and a record unmatched in the region, Robertson has represented more $10 million-plus properties than any other agent and consistently ranks as the #1 real-estate agent in Charleston County and the State of South Carolina by RealTrends.

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As Founding Partner of The Cassina Group, Charleston’s premier boutique brokerage, Robertson blends deep market intelligence with creative, data-driven strategy to deliver extraordinary results. His precision marketing and negotiation expertise extend across Charleston’s most sought-after areas — from historic South of Broad and The Crescent to Sullivan’s Island, Isle of Palms, Kiawah Island, and South Mount Pleasant’s waterfront enclaves where his record-setting transactions have redefined luxury benchmarks.

Robertson’s portfolio includes some of the most significant residential sales in Charleston history, including 5 East Battery ($18.25M), 202 Bank Street, Old Village of Mount Pleasant ($14M), 13 & 15 Meeting Street ($12.6M), and 147 Flyway Drive, Kiawah Island ($11.65M). His clientele ranges from long-time local families to national executives and international investors drawn to Charleston’s timeless architecture, coastal beauty, and lifestyle.

A graduate of Clemson University, Robertson lives in Charleston with his wife and two sons. He recently co-founded the Real Estate Vector of Clemson University’s Brook T. Smith Launchpad for Entrepreneurship, a program designed to mentor and inspire the next generation of real-estate innovators. He has also previously served on the boards of Historic Charleston Foundation, Charleston Day School, and First Citizens Bank, and continues to support organizations such as Good Friends of the Lowcountry, the American Heart Association, and the Dee Norton Child Advocacy Center.

Outside of work, Robertson enjoys tennis, boating, golfing, hunting, and fishing with his two sons, who attend Porter-Gaud School, as well as exploring Charleston’s renowned culinary scene.

• #1 Agent in South Carolina (RealTrends 2024)

• #1 Individual Agent in Charleston County (2023 & 2024)

• $136,455,979 in Closed Sales | $3.6 M Average Sale Price (2024)

• Top 5 Agent in Charleston MLS for overall luxury sales since 2010