Helen Costello

A lifelong resident of St. Louis, Helen Costello brings more than two decades of sales, management, and marketing experience to her real estate practice. Deeply connected to her community, she has been actively involved with organizations such as Big Brothers Big Sisters, Forest Park Forever, De LaSalle School, Cardinal Glennon Children’s Hospital, Catholic Charities, and the Annual Catholic Appeal.

As a full-time real estate professional with over 15 years of experience, Helen is a multimillion-dollar top producer and a seasoned Relocation Specialist. Her extensive knowledge of the St. Louis market spans some of the region’s most sought-after communities—including Clayton, Ladue, University City, Frontenac, Glendale, Webster Groves, Kirkwood, and Chesterfield.

Now proudly part of Dielmann Sotheby’s International Realty, Helen pairs her market expertise with the global reach and elevated marketing resources of one of the world’s most trusted real estate brands.

Her goals remain simple yet unwavering: to provide a seamless transition for both buyers and sellers, and to deliver the highest level of service through honesty, integrity, and genuine enthusiasm.