OVER $1B IN CAREER SALES
Robertson Allen
Founding Partner & Broker-in-Charge at 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.
Closed Sales in 2025
Career Sales
in Charleston County and the State of South Carolina (RealTrends)
Highest Residential Sale
21 East Battery offers a rare opportunity to steward one of Charleston's most historically significant residences. Known as the Edmondston-Alston House, this extraordinary South of Broad property has stood overlooking Charleston Harbor for two centuries. It embodies the architectural beauty, resilience, and layered history that define the Charleston peninsula.Constructed in 1825 for Scottish shipping merchant Charles Edmondston, the residence was among the first substantial houses built along the city's seawall and what is now Charleston's iconic High Battery. A decade later, the property was acquired by Charles Alston, a member of a well-established Lowcountry rice planting family, who refined the house in the Greek Revival style. Alston added architectural elements including the signature three tiered piazzas supported by Corinthian columns and a distinctive parapet bearing the Alston family crest.
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.
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.
