Castelli Real Estate Services Since Castelli Real Estate Services doors opened in 2004, their integrity, quality, and passion for real estate have propelled their business into the largest independent real estate company in South Florida. With nearly 60 combined years of expertise, they list, buy, sell, and lease a wide range of residential and commercial properties that are compatible with client's wants and needs. From commercial development, condominium construction, and property resales to townhouses and single-family homes, Castelli Real Estate Services will cover all real estate needs.