About Mark D Olejniczak Realty, Inc. is a full-service real estate company serving the Northeast Wisconsin areas of Green Bay, Appleton, Oshkosh, and Fond du Lac. Established in 1980, Our extensive experience, proven track record, and dedication to our customers help define us as one of the premier real estate agencies in the area. A Green Bay Tradition Since 1980 Our office is located in The Village of Allouez, Green Bay, at 375 W. St. Joseph St. overlooking the beautiful Fox River. A Green Bay Tradition Mark D Olejniczak Realty, Inc. has been a Green Bay tradition since 1980. Mark D Olejniczak Realty, Inc. is a 4th generation real estate company dating back to 1906 and is one of the longest-standing independent brokerages in Northeast Wisconsin. The Expert Advantage Nearly 38% of our realty staff has earned the Certified Residential Specialist (CRS) designation from the Residential Real Estate Council, compared to only 3% of Realtors nationwide. Our Realtors have over 22 average years of experience per sales associate. When it comes to buying and selling real estate, we offer expert-level service. Best of the Bay 12-Time Winner! Mark D. Olejniczak Realty, Inc. is a 12-time winner of the Green Bay Press-Gazette Reader’s Choice Award for Best Real Estate Agency in Green Bay WI. Contact Us A Realtor© is available at our office 5 days a week, 8 am – 5 pm and on-call during nights and weekends to answer any question you may have about buying or selling real estate in Northeast Wisconsin.