The Cassina Group
The Cassina Group

309 Coleman Boulevard

Mt. Pleasant, SC, United States

Robertson Allen

Founding Partner, Broker-In-Charge, REALTOR®


A Charleston native, Robertson loves the Lowcountry and everything this one-of-a-kind city has to offer.

Robertson graduated from Clemson University and has worked in the Charleston real estate market since 2002. In 2006, Robertson formed The Cassina Group with his business partner, and the company consistently ranks as the #1 boutique firm in Charleston, SC.

Over the course of his career, Robertson has become an annual multi-million dollar producer and a multiple year recipient of the Realtor of Distinction - Executive Circle award. He specializes in luxury properties in historic downtown Charleston, Mount Pleasant, Sullivan’s Island, Isle of Palms, and other areas of the Lowcountry, while always delivering the strongest results for both his buyer and seller clients.

Robertson takes a creative, solutions-driven approach to finding the perfect match for his clients and works tirelessly to find the "right addresses" to ensure that they will love Charleston as much as he does. He currently lives with his wife and two sons in the city of Charleston and enjoys boating, fishing, playing golf, and exploring the city’s culinary scene. He is also actively involved in the community, serving on boards for Charleston Day School, Historic Charleston Foundation and First Citizens Bank, as well as a supporter of Good Friends of the Lowcountry and the American Heart Association.

Some of Robertson's recent real estate honors include:

• #1 agent for Charleston County sales (2023)
• #1 agent in MLS for sales on Sullivan's Island (2023)
• #2 agent in MLS for sales in historic downtown (2023)
• #1 agent in South Carolina by Real Trends (2022)
• #1 agent in MLS for overall sales (2021)
• Top 5 agent in MLS for overall sales (since 2010)
• Top 5 agent in MLS (since 2010) for the following luxury categories: $1,000,000, $2,000,000, $3,000,000, $4,000,000, $5,000,000 & $6,000,000

Business Details

Year Established

Service Areas

Charleston, SC
Mount Pleasant, SC
Isle of Palms, SC
Sullivan's Island, SC

Additional Resources

My Listings

Charleston, SC, United States

$3,150,000 USD

5 6
Charleston, SC, United States

$7,950,000 USD

4 7
Isle of Palms, SC, United States

$6,350,000 USD

Mount Pleasant, SC, United States

$7,375,000 USD

5 4
Mount Pleasant, SC, United States

$2,995,000 USD

4 4
Mount Pleasant, SC, United States

$1,225,000 USD

4 4


"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 Moore

"Earlier this month I used Robertson Allen with The Cassina Group to list and sell my home. They not only made the process completely painless and smooth, they also helped me sell it in record time with their great marketing strategy! My home was under contract in 5 days after listing and I even received a back-up offer shortly thereafter."

Dotty Strobel

"During the very involved sales process of my Mother’s family home on Queen St, time and again, I was grateful to be successfully represented by Robertson Allen and The Cassina Group. Robertson is an expert who knows, a professional who performs and a fine man of integrity you can trust."

Sloan Wright

"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 Steinsbeger

"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 Eisenhauer

"[W]e value Robertson’s knowledge, expertise, and professionalism. As two former attorneys and current investment advisers, we believe that--with respect to Robertson--our trust was extremely well-placed."

James and Dianna Goldman