Justine Mangione

Agent

410.274.1433

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!

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Reviews

Highly likely to recommend

Local knowledge
Process expertise
Responsiveness
Negotiation skills

“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

Local knowledge
Process expertise
Responsiveness
Negotiation skills

“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

Local knowledge
Process expertise
Responsiveness
Negotiation skills

“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

Local knowledge
Process expertise
Responsiveness
Negotiation skills

“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

Local knowledge
Process expertise
Responsiveness
Negotiation skills

“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.”

Dave

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Client's Success Stories

Testimonials

"Maria has been my real estate agent for many years and has helped me purchase multiple properties. She consistently provides expert guidance on improvements that maximize profit while controlling costs. Her contractor recommendations and attention to detail make the process seamless. Her knowledge, advocacy, and dedication make her my #1 choice for real estate services."

"Maria helped prepare my home for market when I wasn’t in a position to handle the updates myself. She arranged landscaping and power washing, allowing the expense to be recovered at closing. The improvements resulted in beautiful photos and multiple offers over list price. I truly felt she went out of her way to help me maximize my profit."

"In a super competitive seller’s market, Maria helped us secure a home against nearly 20 competing buyers. Purchasing from across the country could have been overwhelming, but her market expertise, strategic negotiation, and steady guidance made the entire process seamless. She truly went above and beyond every step of the way."

"Maria was absolutely exceptional throughout our home sale. She took a hands-on approach in preparing the property, even personally overseeing projects when we couldn’t be there. Her market knowledge, strategic pricing, and strong negotiation skills resulted in an outstanding price and terms for our home. She made the entire process feel manageable and exciting, and we felt supported and confident … Read MoreRead Less

"Coming from a small but mighty family-owned brokerage, my biggest question was whether I’d still have the personal autonomy I value—along with the strong backend systems needed to grow. After sitting down with Dave, the path forward became crystal clear. Now, two years later, I can honestly say the growth has exceeded my expectations—personally, professionally, and relationally. My business has… Read MoreRead Less

"Moving to Cummings & Co Realtors in 2017 after 17 years of being in Real Estate was the smartest career move I ever made. I only wish I had done it sooner. The sense of Community and Professionalism surpasses all other brokerages from what I hear. Dave is encouraging and supportive; if you need to find something out ,our network of seasoned agents is always so helpful and knowledgeable . Cumming… Read MoreRead Less

"I’m proud to be aligned with a forward-thinking brokerage defined by strong, visionary leadership that begins at the top. The depth of experience among our agents creates a culture of excellence, collaboration, and integrity. Coupled with beautifully designed office spaces that reflect our standard of professionalism, it’s an environment that truly supports both elevated service and continued grow… Read MoreRead Less

"Joining this brokerage has been one of the best decisions of my real estate career. The level of support here is unmatched—whether you’re navigating a complex transaction or simply need a second opinion, there’s always someone willing to step in and help. The culture is built on true collaboration, not competition. Agents openly share ideas, strategies, and encouragement, creating an environment w… Read MoreRead Less

"After more than 26 years in real estate, my business continues to grow, largely through referrals and strong relationships. Choosing the right brokerage matters, and Cummings & Co. has been an outstanding partner and the perfect option for the expansion of my team. It truly feels like the best of both worlds: a locally owned company with a supportive culture, paired with smart technology and conve… Read MoreRead Less

"Kevin did an outstanding job with helping me look for a home.. and he also did it at a timely matter. Kevin ! Sent me homes everyday to look over. I would tell him the ones i liked. He would have reach out to the places , and I would have a viewing fast. I felt like I was picky , but he told me I wasn’t. I found my home with only looking at 3 houses. He stayed on top of everything. And even though… Read MoreRead Less

"Kevin did an excellent job going above and beyond . Kevin's passion and integrity is unparalleled, he really made my first time home owner experience pleasant and easy."

"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!"

"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."

"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."

"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… Read MoreRead Less

"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 … Read MoreRead Less

"Sharon was a Dream to work with! She was knowledgeable, communicative, timely and incredibly personable. I felt totally comfortable asking questions throughout the process. I couldn't have asked for a better home buying experience. I highly recommend Sharon Allen if you're looking for a realtor!"

"We used Barbara about 2 years ago to find our first home in Harford County. We worked with Barbara and she showed us quite a few houses all within our budget and wants in a home. Being new to the process, Barbara was great. At times, when we needed it, she held our hand sort to speak through the process and gave us information so we learned the process too. We would definitely recommend working wi… Read MoreRead Less

"I’m proud to call Cummings & Co. home. I started my career here on a team, learning under a top-tier agent who set the bar high for mentorship, professionalism, and integrity. Today, I work independently—but I’ve never felt alone. The culture and caliber of agents you encounter in every office keeps you engaged, supported, and encouraged. There’s no sense of competition—only collaboration. We t… Read MoreRead Less

"She is very responsive and was persistent in helping us find our home. She gave us good advice and followed through with all the details and answered questions promptly. Very knowledgeable about the regional real estate market."