Robertson Allen

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About Robertson

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Recent Recognition

Meet Robertson Allen

Founding Partner | Broker-in-Charge, The Cassina Group

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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Robertson Allen Mount Pleasant, SC Real Estate Agent Headshot

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.

Recent Recognition

  • #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

Testimonials

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  • Robertson was incredibly helpful while we were looking for a house on Sullivan's Island. It can be very stressful and frustrating buying a house from afar, and Robertson always kept us apprised of the situation/negotiations during the entire process. We were completely satisfied with our relationship with The Cassina Group, and we feel that Robertson is not just our realtor, but a friend.
    — Nick S.
  • We have purchased four properties and sold three in the Old Village of Mount Pleasant with the assistance of Robertson Allen and the team at the Cassina Group since 2008. If you smartly or luckily choose Robertson Allen, you get an impressive team package. Robertson is knowledgeable, kind, intelligent, and a wonderful listener. We think so much of Robertson and his credibility that we actually bought our current home in April of 2016 without even physically seeing it. He looked. He knew the house. He knows us. We just trusted him, and we couldn't be happier.
    — Tim & Lindsi E.
  • From the moment I spoke with Robertson on the phone, I knew that he and The Cassina Group were an amazing match for us. Robertson was consistently highly motivated, knowledgeable, professional, and communicative - all qualities I required in a broker.
    — Jordan M.
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Robertson’s deep Charleston roots and extensive market expertise allow him to identify the city’s most desirable addresses and investment opportunities. His clients trust him for clear communication, exceptional negotiation skills, and an unwavering commitment to helping them achieve their real estate goals.

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Contact Details

Robertson Allen

Phone

(843) 442-6534

Email

[email protected]

Address

309 Coleman Blvd Mount Pleasant SC 29464

Submit a Message

By providing your contact information to Robertson Allen, your personal information will be processed in accordance with Robertson Allen's Privacy Policy. By checking the box(es) below, you consent to receive communications regarding your real estate inquiries and related marketing and promotional updates in the manner selected by you. For SMS text messages, message frequency varies. Message and data rates may apply. You may opt out of receiving further communications from Robertson Allen at any time. To opt out of receiving SMS text messages, reply STOP to unsubscribe.

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