Robertson Allen

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OVER $1B IN CAREER SALES

Robertson Allen

Founding Partner & Broker-in-Charge at The Cassina Group

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Recent Recognition

Meet Robertson Allen

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

Born and raised in Charleston, Robertson Allen is a leading force in the region’s luxury real estate market. As a top Charleston real estate agent with over 20 years of experience and more than $1B in career sales, he has closed more $10 million-plus transactions than any other agent and is consistently recognized by RealTrends as the #1 agent in Charleston County and the State of South Carolina.

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Robertson Allen Mount Pleasant, SC Real Estate Agent Headshot

As Founding Partner of The Cassina Group, Charleston’s leading boutique real estate firm, Robertson Allen brings deep market expertise and a strategic, data-driven approach to every transaction. He has represented some of the most significant residential sales in Charleston history, with record-setting transactions exceeding $18 million across the city’s most prestigious neighborhoods, including South of Broad, The Crescent, Sullivan’s Island, Isle of Palms, Kiawah Island, and Mount Pleasant’s premier waterfront communities. Trusted by local families, corporate executives, and international buyers, Robertson is known for his discretion, market insight, and consistent performance at the highest level of the luxury market.

A Clemson University graduate, Robertson Allen lives in Charleston with his wife and two sons and is deeply engaged in both the real estate industry and the Lowcountry community. He co-founded the Real Estate Vector at Clemson University’s Brook T. Smith Launchpad for Entrepreneurship, has served on the boards of the Historic Charleston Foundation, Charleston Day School, and First Citizens Bank, and supports several local and national philanthropic organizations. Outside of work, Robertson enjoys an active coastal lifestyle, spending time boating, fishing, golfing, and exploring Charleston’s acclaimed culinary scene with his family.

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

Robertson Allen's Highlights

$167,946,866

Closed Sales in 2025

$1B+

Career Sales

#1

in Charleston County and the State of South Carolina (RealTrends)

$21.5M

Highest Residential Sale

Featured Listings

Notable Transactions

Home Valuation

1 44th Avenue

Experience an extraordinary oceanfront lifestyle at 1 44th Avenue, one of Isle of Palms' most thoughtfully designed and meticulously crafted residences. Situated on a quiet street, this private estate features lush, manicured gardens designed by Wertimer and Cline, a full driveway, and a three-car climate-controlled garage. Built in 2017 by Sheppard Construction in collaboration with architect Beau Clowney and acclaimed Charleston designer Cortney Bishop, every element of the home has been carefully curated to create a refined coastalretreat.

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Featured Listings

1 44th Avenue
For Sale

1 44th Avenue

4 Beds | 7 Baths | 4,514 Sq.Ft.
$17,950,000
172 Tradd Street
For Sale

172 Tradd Street

4 Beds | 5 Baths | 5,774 Sq.Ft.
$10,000,000
12 Orange Street
For Sale

12 Orange Street

4 Beds | 4 Baths | 3,973 Sq.Ft.
$7,950,000
22 Rutledge Avenue
For Sale

22 Rutledge Avenue

6 Beds | 7 Baths | 6,382 Sq.Ft.
$7,950,000
222 Haddrell Street
Active Under Contract

222 Haddrell Street

5 Beds | 4 Baths | 3,740 Sq.Ft.
$5,595,000
284 Meeting Street # 302
Active Under Contract

284 Meeting Street # 302

3 Beds | 4 Baths | 3,221 Sq.Ft.
$4,620,000
284 Meeting Street # 303
Active Under Contract

284 Meeting Street # 303

3 Beds | 4 Baths | 2,847 Sq.Ft.
$4,290,000
0 Hoopstick Island Road Lot 2
Active Under Contract

0 Hoopstick Island Road Lot 2

20.11 Acres
$3,450,000
284 Meeting Street # 201
Active Under Contract

284 Meeting Street # 201

3 Beds | 4 Baths | 2,377 Sq.Ft.
$3,410,000
0 Hoopstick Island Road Lot 3
For Sale

0 Hoopstick Island Road Lot 3

7.73 Acres
$3,200,000
0 Hoopstick Island Road Lot 4
For Sale

0 Hoopstick Island Road Lot 4

6.38 Acres
$3,000,000
5 Legare Street # C
For Sale

5 Legare Street # C

2 Beds | 3 Baths | 2,662 Sq.Ft.
$2,995,000
355 Cooper River Drive
For Sale

355 Cooper River Drive

3 Beds | 4 Baths | 2,823 Sq.Ft.
$2,925,000
0 Hoopstick Island Road Lot 1
For Sale

0 Hoopstick Island Road Lot 1

12.03 Acres
$2,750,000
28 Rebellion Road
For Sale

28 Rebellion Road

4 Beds | 3 Baths | 3,480 Sq.Ft.
$1,899,900
3 King Street
Active Under Contract

3 King Street

2 Beds | 2 Baths | 1,134 Sq.Ft.
$1,650,000
80 Ashley Avenue
Active Under Contract

80 Ashley Avenue

3,920.4 Sq.Ft.
$1,150,000
3025 Southerly Way
For Sale

3025 Southerly Way

1 Beds | 1 Baths | 509 Sq.Ft.
$975,000
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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.
VIEW ALL
5 East Battery
Sold
NOTABLE SALES
$18,250,000
5 East Battery
5 East Battery, Charleston, SC 29401
8 BD 10 BA 9,407 Sq.Ft.
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13 & 15 East Battery Street
Sold
NOTABLE SALES
$12,450,000
13 & 15 East Battery Street
13 & 15 East Battery Street, Charleston, SC 29401
15 BD 13 BA 14,726 Sq.Ft.
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306 & 308 Ocean Boulevard
Sold
NOTABLE SALES
$10,002,777
306 & 308 Ocean Boulevard
306 & 308 Ocean Boulevard, Isle of Palms, SC 29451
4 BD 4 BA 2,904 Sq.Ft.
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3001 Marshall Boulevard
Sold
NOTABLE SALES
$8,050,000
3001 Marshall Boulevard
3001 Marshall Boulevard, Sullivans Island, SC 29482
4 BD 5 BA 3,401 Sq.Ft.
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27 Lamboll Street
Sold
NOTABLE SALES
$7,400,000
27 Lamboll Street
27 Lamboll Street, Charleston, SC 29401
4 BD 7 BA 6,869 Sq.Ft.
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2402 Goldbug Avenue
Sold
NOTABLE SALES
$7,205,000
2402 Goldbug Avenue
2402 Goldbug Avenue, Sullivans Island, SC 29482
5 BD 5 BA 3,822 Sq.Ft.
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106 Murray Boulevard
Sold
NOTABLE SALES
$6,900,000
106 Murray Boulevard
106 Murray Boulevard, Charleston, SC 29401
4 BD 6 BA 6,236 Sq.Ft.
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75 Concord Street
Sold
NOTABLE SALES
$6,500,000
75 Concord Street
75 Concord Street, Charleston, SC 29401
4 BD 6 BA 4,072 Sq.Ft.
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126 Hibben Street
Sold
NOTABLE SALES
$6,250,000
126 Hibben Street
126 Hibben Street, Mount Pleasant, SC 29464
5 BD 5 BA 4,022 Sq.Ft.
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2414 Myrtle Avenue
Sold
NOTABLE SALES
$5,900,000
2414 Myrtle Avenue
2414 Myrtle Avenue, Sullivans Island, SC 29482
7 BD 6 BA 5,078 Sq.Ft.
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1817 Back Street
Sold
NOTABLE SALES
$5,660,000
1817 Back Street
1817 Back Street, Sullivans Island, SC 29482
4 BD 5 BA 4,770 Sq.Ft.
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1723 Middle Street
Sold
NOTABLE SALES
$5,325,000
1723 Middle Street
1723 Middle Street, Sullivans Island, SC 29482
4 BD 5 BA 4,043 Sq.Ft.
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2307 Ion Avenue
Sold
NOTABLE SALES
$5,300,000
2307 Ion Avenue
2307 Ion Avenue, Sullivans Island, SC 29482
3 BD 3 BA 3,528 Sq.Ft.
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2614 Palm Boulevard
Sold
NOTABLE SALES
$5,260,000
2614 Palm Boulevard
2614 Palm Boulevard, Isle of Palms, SC 29451
5 BD 6 BA 3,769 Sq.Ft.
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24 Chalmers Street
Sold
NOTABLE SALES
$5,200,000
24 Chalmers Street
24 Chalmers Street, Charleston, SC 29401
5 BD 7 BA 6,200 Sq.Ft.
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13 Johnson Road
Sold
NOTABLE SALES
$4,850,000
13 Johnson Road
13 Johnson Road, Charleston, SC 29407
5 BD 8 BA 8,180 Sq.Ft.
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11 Montagu Street
Sold
NOTABLE SALES
$4,600,000
11 Montagu Street
11 Montagu Street, Charleston, SC 29401
5 BD 5 BA 5,020 Sq.Ft.
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6 Judith Street
Sold
NOTABLE SALES
$4,500,000
6 Judith Street
6 Judith Street, Charleston, SC 29403
5 BD 6 BA 5,126 Sq.Ft.
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32 Morgan Creek Drive
Sold
NOTABLE SALES
$4,350,000
32 Morgan Creek Drive
32 Morgan Creek Drive, Isle of Palms, SC 29451
5 BD 7 BA 4,368 Sq.Ft.
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5 Fishers Aly
Sold
NOTABLE SALES
$4,350,000
5 Fishers Aly
5 Fishers Aly, Isle of Palms, SC 29451
6 BD 6 BA 5,356 Sq.Ft.
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533 Old Compass Road
Sold
NOTABLE SALES
$4,200,000
533 Old Compass Road
533 Old Compass Road, Charleston, SC 29492
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10970 Hwy 17, McClellanville
Sold
NOTABLE SALES
$4,100,000
10970 Hwy 17, McClellanville
10970 Hwy 17, McClellanville, Mc Clellanville, SC 29458
9 BD 9 BA 5,620 Sq.Ft.
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906 Middle Street
Sold
NOTABLE SALES
$3,900,000
906 Middle Street
906 Middle Street, Sullivans Island, SC 29482
4 BD 4 BA 3,646 Sq.Ft.
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119 Riverland Drive
Sold
NOTABLE SALES
$3,850,000
119 Riverland Drive
119 Riverland Drive, Charleston, SC 29412
3 BD 3 BA 2,456 Sq.Ft.
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520 Whilden Street
Sold
NOTABLE SALES
$3,800,000
520 Whilden Street
520 Whilden Street, Mount Pleasant, SC 29464
6 BD 6 BA 5,880 Sq.Ft.
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49 Society Street
Sold
NOTABLE SALES
$3,650,000
49 Society Street
49 Society Street, Charleston, SC 29401
4 BD 5 BA 3,612 Sq.Ft.
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1417 Middle Street
Sold
NOTABLE SALES
$3,525,000
1417 Middle Street
1417 Middle Street, Sullivans Island, SC 29482
4 BD 4 BA 2,687 Sq.Ft.
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21 New Street
Sold
NOTABLE SALES
$3,470,000
21 New Street
21 New Street, Charleston, SC 29401
5 BD 6 BA 5,362 Sq.Ft.
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1763 Atlantic Avenue
Sold
NOTABLE SALES
$3,425,000
1763 Atlantic Avenue
1763 Atlantic Avenue, Sullivans Island, SC 29482
3 BD 2 BA 1,760 Sq.Ft.
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59 Anson Street
Sold
NOTABLE SALES
$3,240,000
59 Anson Street
59 Anson Street, Charleston, SC 29401
5 BD 5 BA 4,203 Sq.Ft.
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1668 Omni Boulevard
Sold
NOTABLE SALES
$3,100,000
1668 Omni Boulevard
1668 Omni Boulevard, Mount Pleasant, SC 29466
4 BD 4 BA 3,601 Sq.Ft.
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384 Overseer Place
Sold
NOTABLE SALES
$2,975,000
384 Overseer Place
384 Overseer Place, Mount Pleasant, SC 29464
4 BD 4 BA 4,713 Sq.Ft.
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40 New Street
Sold
NOTABLE SALES
$2,915,000
40 New Street
40 New Street, Charleston, SC 29401
3 BD 4 BA 2,682 Sq.Ft.
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21 Colonial Street
Sold
NOTABLE SALES
$2,900,000
21 Colonial Street
21 Colonial Street, Charleston, SC 29401
4 BD 4 BA 3,575 Sq.Ft.
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86 S Battery Street
Sold
NOTABLE SALES
$2,800,000
86 S Battery Street
86 S Battery Street, Charleston, SC 29401
4 BD 3 BA 2,161 Sq.Ft.
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32 N Adgers Wharf
Sold
NOTABLE SALES
$2,785,000
32 N Adgers Wharf
32 N Adgers Wharf, Charleston, SC 29401
3 BD 3 BA 2,250 Sq.Ft.
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1459 Burningtree Road
Sold
NOTABLE SALES
$2,765,000
1459 Burningtree Road
1459 Burningtree Road, Charleston, SC 29412
4 BD 5 BA 4,018 Sq.Ft.
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139 Toomer Lane
Sold
NOTABLE SALES
$2,750,000
139 Toomer Lane
139 Toomer Lane, Mount Pleasant, SC 29464
6 BD 5 BA 5,365 Sq.Ft.
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16 Fairway Village Lane
Sold
NOTABLE SALES
$2,720,000
16 Fairway Village Lane
16 Fairway Village Lane, Isle of Palms, SC 29451
4 BD 5 BA 3,323 Sq.Ft.
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158 Mary Ellen Drive
Sold
NOTABLE SALES
$2,525,000
158 Mary Ellen Drive
158 Mary Ellen Drive, Charleston, SC 29403
5 BD 6 BA 3,705 Sq.Ft.
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2870 Ion Avenue
Sold
NOTABLE SALES
$2,500,000
2870 Ion Avenue
2870 Ion Avenue, Sullivans Island, SC 29482
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165 Mary Ellen Drive
Sold
NOTABLE SALES
$2,491,000
165 Mary Ellen Drive
165 Mary Ellen Drive, Charleston, SC 29403
4 BD 4 BA 3,438 Sq.Ft.
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10 Water Street
Sold
NOTABLE SALES
$2,375,000
10 Water Street
10 Water Street, Charleston, SC 29401
4 BD 4 BA 2,742 Sq.Ft.
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14 Johnson Road
Sold
NOTABLE SALES
$2,350,000
14 Johnson Road
14 Johnson Road, Charleston, SC 29407
4 BD 3 BA 2,788 Sq.Ft.
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2942 Deer Point Drive
Sold
NOTABLE SALES
$2,300,000
2942 Deer Point Drive
2942 Deer Point Drive, Seabrook Island, SC 29455
3 BD 4 BA 3,360 Sq.Ft.
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388 Evian Way
Sold
NOTABLE SALES
$2,250,000
388 Evian Way
388 Evian Way, Mount Pleasant, SC 29464
5 BD 5 BA 4,422 Sq.Ft.
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8 Smith Street
Sold
NOTABLE SALES
$2,250,000
8 Smith Street
8 Smith Street, Charleston, SC 29401
5 BD 6 BA 2,896 Sq.Ft.
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3 Chisolm Street # 207
Sold
NOTABLE SALES
$2,200,000
3 Chisolm Street # 207
3 Chisolm Street # 207, Charleston, SC 29401
3 BD 3 BA 3,238 Sq.Ft.
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3578 Clambank Drive
Sold
NOTABLE SALES
$2,132,813
3578 Clambank Drive
3578 Clambank Drive, Mount Pleasant, SC 29466
5 BD 6 BA 4,373 Sq.Ft.
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3 Chisolm Street # 101
Sold
NOTABLE SALES
$2,100,000
3 Chisolm Street # 101
3 Chisolm Street # 101, Charleston, SC 29401
3 BD 3 BA 2,160 Sq.Ft.
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Areas of Expertise

Robertson’s expertise spans Charleston’s most sought-after properties — from historic downtown residences to oceanfront and deepwater estates throughout the Lowcountry. As a Charleston native and co-founder of The Cassina Group, he offers an unmatched perspective on the region’s luxury real estate market, blending local insight with global reach.

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Peninsula of Charleston EXPLORE

Peninsula of Charleston

South Mount Pleasant EXPLORE

South Mount Pleasant

Sullivan’s Island EXPLORE

Sullivan’s Island

Isle of Palms EXPLORE

Isle of Palms

As Seen In

Robertson Allen recognized as No. 1 agent In South Carolina
Iconic Charleston Home on High Battery Listed for Sale with The Cassina Group
The Cassina Group's Robertson Allen Participates In Historic Sale On East Battery Street
Sale of historic Charleston home for $12.45M second-highest on peninsula
The Cassina Group’s Robertson Allen Participates in Historic Sale on East Battery Street
Charleston’s Leading Real Estate Firm, The Cassina Group, Reflects On a Record-Breaking 2023, Top Charleston Realtor Launches New Team with Carolina One Real Estate
Trump Treasury Pick Listed His Home for Sale Prior to Election
Trump's Treasury secretary sells historic Charleston mansion for a record price
Historic Ravenel home on Charleston Battery sells for record price
Record set for South of Broad with the sale of 5 East Battery Street for $18.25 million
Record Set For South of Broad With the Sale of 5 East Battery Street For $18.25 Million
The Cassina Group: What it takes to lead the luxury real estate market in Charleston
The Cassina Group’s Robertson Allen Participates in Historic Sale on East Battery Street
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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

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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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