Using an innovative approach of "aggressive marketing", Century 21 Atlantic was launched for business in January, 1991 and covered a geographic territory of several New Jersey counties. The office grew rapidly, first in northern New Jersey and then across the entire State. In addition to being licensed by the State of New Jersey, in 1993 its founder George A. Castro, was granted a Brokers license by the State of New York. This enabled him to expand his company's Real Estate operations across the Hudson River.

By 2000, sales for Century 21 Atlantic topped 1.2 billion. Expansion and operations beyond New Jersey began in 1991. In 1993 Century 21 Atlantic was firmly operating in New York. Today, the familiar Century 21 logo, yard sign and distinctive "Gold Blazer" can be seen in France, The United Kingdom, Australia, Mexico, Venezuela and other parts of Europe and the Pacific Rim. Century 21 Atlantic currently serves a vast commercial and industrial market and is known for representing builders in new construction projects.