Bio
A New York City native, Justine relocated to Baltimore with her family in January 1996 and has proudly called the area home ever since. A licensed Realtor® since 2003, she brings over two decades of hands-on experience, deep local market knowledge, and an unwavering commitment to her clients. Justine serves clients throughout Baltimore County, Baltimore City, Harford, Carroll, and Howard Counties, helping them navigate each market with confidence and clarity.
Consistently recognized as a top producer, Justine believes real estate is the ultimate service business. She is known for truly listening to her clients, earning their trust through dedication, professionalism, and results. This client-first approach is reflected in her strong referral-based business and long-standing relationships.
Justine expertly guides buyers, sellers, and investors through every step of the transaction with a strategic plan, a results-driven mindset, and skilled negotiation. She is delighted to work with first-time homebuyers, seasoned investors, and sellers alike—whether assisting with an entry-level home or a luxury estate. Every client is valued, and every goal matters.
Committed to ongoing education and excellence, Justine has achieved the following professional designations: GRI (Graduate, REALTOR® Institute), ABR (Accredited Buyer’s Representative), and CNE (Certified Negotiation Expert)—further reinforcing her ability to deliver exceptional service and outcomes.
A cum laude graduate of Marymount Manhattan College with a B.A. in Business Administration, Justine previously built a successful career in New York City’s premier hotel industry, rising to the position of Director of Catering. There, she combined her business expertise with her passion for food, wine, and entertaining—skills that translate seamlessly into her real estate career.
Outside of real estate, Justine enjoys reading, traveling, spending time with family and friends, and maintaining a great sense of humor—an attribute her clients truly appreciate during what can be a complex process.
Justine is partnered with Mary Ann Gruntowicz as the Platinum Team of Cummings & Co, because every client deserves that level of service!
Reviews
Highly likely to recommend
“We highly recommend Justine. She will be our realtor for life. I’ve bought two houses with her and sold one and I don’t feel like it could have gone smoother in any of the deals. She is friendly, knowledgeable, and always available. She made the whole process a breeze. She will fight for you and always has your best interests at heart. Thank you for everything you do Justine!”
Pete & Kelli
Highly likely to recommend
“You epitomize what's good, not only in our industry, but in humanity! It's been a pleaseure & I hope to work with you again soon.”
A Co-op Realtor
Highly likely to recommend
“Justine was the perfect agent. She was extremely patient with us and not the least bit pushy. She knew exactly what we wanted and guided us throughout our search. At the end of the process not only did we end up buying the perfect house, but we gained a friend who then went on to my find my mother the perfect retirement condo.”
Stacey & Kevin
Highly likely to recommend
“Several years ago I had the unfortunate responsibility of cleaning out and selling the home in Ruxton where I had grown up and and where my parents had lived for 48 years. The task to me was daunting. Justine Mangione, my friend and real estate agent supported me throughout the process, suggesting necessary upgrades and changes. With her help we were able to sell the house in just 10 days for an excellent price!”
Carey
Highly likely to recommend
“Justine recently sold my parent’s house and we could not have been more pleased with the outcome. Justine’s attention to detail, knowledge of the housing market and professionalism when dealing with not only the buyers but also other realtors helped produce an exceptional result. We have referred multiple prospects to Justine due to her trustworthy approach, her results oriented nature and most importantly her high work ethic. I definitely will continue to recommend Justine’s services to perspective buyers or sellers because I know she will work hard for them.”