Robertson Allen

Robertson Allen is a Charleston native and one of the Lowcountry’s most accomplished luxury real estate brokers, with over $1 billion in lifetime sales. A graduate of Clemson University, Robertson has been a leader in the Charleston real estate market since 2002. In 2006, he co-founded The Cassina Group, which consistently ranks as the #1 boutique real estate firm in Charleston.

Robertson specializes in luxury properties throughout historic downtown Charleston, Mount Pleasant, Sullivan’s Island, and Isle of Palms, representing buyers and sellers in some of the most architecturally significant and sought-after residences in the Lowcountry. Through decades of relationships and deep market insight, he is widely known for uncovering and securing exceptional off-market opportunities, often providing his clients access to premier properties before they reach the public market.

In addition to his real estate career, Robertson is a Co-Founder of the Real Estate Vector within the Brook T. Smith Entrepreneurial Program at Clemson University, where he helps mentor the next generation of real estate entrepreneurs.

He lives in Charleston with his wife and two sons and enjoys boating, fishing, golf, and exploring the city’s renowned culinary scene. Robertson is also actively involved in the community, serving on boards for Charleston Day School, Historic Charleston Foundation, and First Citizens Bank, and supporting organizations including Porter-Gaud School, Dee Norton Child Advocacy Center, Good Friends of the Lowcountry, and the American Heart Association.

Trusted by discerning clients throughout the Lowcountry, Robertson is frequently called upon to represent many of Charleston’s most significant and privately held properties, where discretion, relationships, and market expertise are paramount.

Recent Recognition

Selected Real Estate Honors

• #1 Agent in South Carolina – RealTrends (2022, 2024 & 2025)
• $167,946,866 in Closed Sales (2025)
• $5,013,339 Average Sales Price (2025)
• $136,455,979 in Closed Sales (2024)
• $3,638,826 Average Sales Price (2024)
• $129,734,006 in Closed Sales (2023)
• $4,473,586 Average Sales Price (2023)

• #1 Individual Agent in Charleston County (2023, 2024 & 2025)
• #1 Agent – South Mount Pleasant (2025)
• #1 Agent – Sullivan’s Island (2023)
• #1 Agent – Old Village (2023 & 2025)
• #2 Agent – South of Broad (2023, 2024 & 2025)
• #2 Agent in Charleston MLS for Sales in Historic Downtown (2023)
• #1 Agent in Charleston MLS for Overall Sales (2021)

• Top 5 Agent in Charleston MLS for Overall Sales (since 2010)
• Top 5 Agent in Charleston MLS since 2010 in the following luxury categories:
$1M+, $2M+, $3M+, $4M+, $5M+, and $6M+ properties

Notable Sales
51 E Bay Street, South of Broad ($21,028,560; represented the buyer)
5 E. Battery Street, South of Broad ($18,250,000; represented the seller)
202 Bank Street, Old Village ($14,000,000; represented the buyer)
13 & 15 Meeting Street, South of Broad ($12,600,000; represented buyers & sellers)
13 & 15 E Battery Street, South of Broad ($12,450,000; represented the buyers)
18 Broad Street #801, South of Broad ($12,000,000; represented the seller)
147 Flyway Drive, Kiawah Island ($11,650,000; represented the seller)
2411 Atlantic Avenue, Sullivan's Island ($10,100,000; represented the seller)
306 + 308 Ocean Boulevard, Isle of Palms ($10,002,777; represented the seller)
15 Broughton Road, The Crescent ($9,250,000; represented the seller)
2529 Atlantic Avenue, Sullivan's Island ($9,075,000; represented the seller)
205 Ferry Street, Old Village ($8,400,000; represented the seller)
362 Schweers Lane, Old Village ($8,000,000; represented the buyer)
2 Gibbes Street, South of Broad ($7,675,000);represented the buyers
27 Lamboll Street, South of Broad ($7,400,000; represented the seller & buyer)
2402 Goldbug Avenue, Sullivan’s Island ($7,205,000; represented the seller)
2411 Atlantic Avenue, Sullivan's Island ($6,850,000; represented the buyer & seller)
116 Ocean Boulevard, Isle of Palms ($6,800,000; represented the buyer & seller)
37 King Street, South of Broad ($6,500,000; represented the seller)
12 Church Street, South of Broad ($6,000,000; represented the buyer)
310 Ocean Boulevard, Isle of Palms ($5,995,000; represented the seller)
2414 Myrtle Avenue, Sullivan’s Island ($5,900,000; represented the seller)
1817 Back Street, Sullivan’s Island ($5,660,000; represented the seller & buyer)
2614 Palm Blvd, Isle of Palms ($5,260,000); represented the sellers
7 Sayle Road, The Crescent ($5,025,000; represented the buyer & seller)
17 Legare Street, South of Broad ($5,000,000; represented the seller)

Check out Robertson on the podcast, Brokering Billions (June 2022)

LEARN MORE ABOUT ROBERTSON
FAVORITE STREET IN CHARLESTON Lower Meeting Street. Some of the best memories I have as a child involve visiting my great grandfather at his house at 15 Meeting. So much of Charleston's history and my childhood was spent on this street.

FAVORITE RESTAURANT IN CHARLESTON The Ordinary - Mike Lata is not only a client of mine but hands down one of the best chefs in the country.

FAVORITE ACTIVITY OUTSIDE OF WORK Spending time with my family. My wife and two sons love the outdoors and we try our best to enjoy everything the Charleston area has to offer. Boating, fishing and water sports are some of our favorites.

FAVORITE LOCAL PRODUCT John's Island Heirloom tomatoes. So many incredible dishes are made in the Allen home with these amazing fruits.

FAVORITE ANNUAL EVENT Wine + Food Festival. This event has grown so much over the years and the number of famous chefs that participate each year is amazing.

MUST-SEE SPOT IN CHARLESTON High Battery/White Point Gardens. Taking a walk or run around the High Battery is something we as residents take for granted. You can see so many historical sites including Fort Sumter, Morris Island, Castle Pinkney, Sullivan's Island (Fort Moultrie), to name a few. You are literally taking in a panoramic view of the birth of our Nation.

PRAISE FOR ROBERTSON

"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

"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

"[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

"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

"We were very impressed with how hard-working [Robertson] is; before we could ask him to do something, we would learn that he had already done it!" - Anonymous

"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

"Working with Robertson Allen was an absolute pleasure. As the listing agent for my penthouse, Robertson was driven, professional and fun (yes, fun) to work with! Our relationship continues. I gave him a “wish list” for my future home. He called one morning to announce “I’ve found it”, and indeed he had!" --T-Mouse Henning

"Amazing experience all around.  Easy transaction and very professional.  Found us a perfect house before it ever hit the market!" --Sarah Hamlin Hastings

"When I called Robertson Allen. at The Cassina Group to ask about the value of my home and the possibility of selling it, he could not have been more responsive and helpful. His advice on what to do to get the house ready as well as his knowledge of perspective buyers was amazing. Every buyer that looked at the house, Except for one, was brought over by the Cassina Group, who eventually sold it for a very good price in a short period of time. Since these were out of town clients, Robertson was amazing at handling all of the intricate details involved with the closing and inspection, etc. Becca, Robe