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Mary Kosiorek
Mary Kosiorek is a dedicated and experienced Michigan Realtor and the founder of Kosi Homes, proudly brokered by 616 Realty. Licensed since 2020, Mary brings over 25 years of administrative expertise and a strong commitment to guiding clients through every step of the real estate process. Based in Grand Rapids (and Traverse City), she serves buyers and sellers across West Michigan and beyond with integrity, efficiency, and a personal touch.
In addition to her real estate work, Mary serves on the Rockford Housing Commission, is a longtime volunteer with Kids Food Basket and served as a local substitute teacher for 10 years. Her passion for community, family and helping others shines through in everything she does.
Mary holds a degree in Criminal Justice from Grand Rapids Community College and is a proud graduate of Creston High School. She enjoys cooking, organizing, traveling and spending time with her husband, children and two German short-haired pointers.
Whether you’re buying your first home, relocating, or selling a property, Mary brings compassion, competence and unwavering advocacy to every transaction.