Connie Antoniou, global real estate advisor of Jameson Sotheby’s International Realty in Illinois and Mahler Sotheby’s International Realty in Wisconsin, has been advocating for her clients for more than 35 years. From her 22-year tenure in the highly competitive Hinsdale, Illinois market to her achievements as Senior Vice President of Sales in Barrington, Illinois and her real estate ventures in Lake Geneva, Wisconsin, she boasts an impressive career. She has proudly owned and operated two Sotheby’s International Realty offices, selling and renting luxury homes to high-profile clients, including Chicago Blackhawks players and coaches and prominent Chicago entrepreneurs and executives. She is consistently ranked in the top tier of Chicagoland agents and was named the #1 agent in volume among the Chicagoland Northwest Office in 2015, 2017, 2018, 2019, 2020, 2021, 2022, and 2023. She’s also been the #1 North Barrington agent in 2021, 2022, 2023.

With her tenacity, luxury-market knowledge, unparalleled expertise, and tireless work ethic, Connie proves to be an invaluable resource for buyers and sellers. She delivers a concierge level experience. Expertly leveraging her local and global connections, including several invitation-only networking and referral groups and the exclusive Golf Life Navigators group, she has a talent for finding one-of-a-kind luxury residences. Connie and the properties she represents have been featured in publications such as Mansion Global & Wall Street Journal, Chicago Agent Magazine, Crain’s Chicago Business, The Little Blue Book for Golfers and more. From keen negotiation to cutting-edge marketing, every stage of the process is white glove; and the relationship doesn’t end at the closing table. Her strong sense of community drives Connie to help homeowners adjust to their new neighborhood, make friends, and settle in — whether they’re moving across the street or around the world — a feat she is able to accomplish through the unmatched resources of the global Sotheby’s International Realty network. 

Connie continues to expand her real estate knowledge and contribute to the integrity of the industry. She has served on the North Shore Barrington Association of Realtors Board and has been a member of the Illinois Realtors Professional Standards Committee since 2013. She is a Certified International Property Specialist, a CRS, GRI, PSA, SFR, a GREEN designee by the National Association of REALTORS®, and a Certified Luxury Home Marketing Specialist™ through the Institute for Luxury Home Marketing. 

Born in Iowa, Connie is the daughter of Greek American parents whose families made their living in the motion picture business. She has dined with Hollywood icons such as Sylvester Stallone and Kevin Costner, and she loves popcorn— a taste she acquired from her first job at age 11, popping it at her father’s movie theatres. An avid horse show competitor in her youth, she enjoys riding horses as well as playing golf. She is the proud mother of a daughter and two sons and loves keeping animals in her life, especially poodles!

Connie has served on the Barrington Chamber of Commerce Board and the Wynstone Property Owners Association in North Barrington, where she resides. She was the first (and only!) woman to serve on the Wynstone Golf Club Board. 

From start to finish, Connie is passionate about serving her clients & deeply committed to helping them make luxury a lifestyle.