"
John was critical to the successful sale. Interacting with town officials to be certain all inspections were cleared and certificate of occupancy was issued in a timely fashion. He also coordinated with the buyers broker to be sure they had what the needed cleaned up on final walk thru. He stayed with the project til the closing was official.
"
- danc88 (via Zillow) (Zillow Review - Sold a home in 2026)
"
Roseann helped us sell our home in Green Brook. What could’ve been a rather stressful situation, was smooth, quick and pain free in many ways. Roseann’s experience in the Green Brook area proved to be incredibly valuable and we appreciate all that she did for us and our family during the move. We highly recommend her.
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- Amy Newman
"
John Mangini came highly recommended to me as I was about to sell my mom's house, the house I grew up in, so there was a strong emotional side to this. John is the most caring person. He scheduled open houses, followed every lead, reported back to me on all leads, since no one was living in the house he would always let me know how many showings were scheduled for the day. John stayed on top of everything. We were going to be away and John even kept an eye on the house. I would not hesitate to recommend John to anyone buying or selling. You would be in good hands!
Sue Lovenguth
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- Sue Lovenguth (via Zillow) (Zillow Review - Sold a Single Family home in 2023 in Warren twp., NJ)
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“Roseann and her team are very detail oriented. This is very important in real estate transactions. She kept everyone informed each step along the way. Her knowledge of the local real estate status is sure to get the best price for all. We highly recommend Roseann O’keefe for your peace of mind. ”
Beverly DeFalco-Sold in Somerset NJ
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- Beverly DeFalco (Seller)
"
Roseann was a pleasure to work with in helping my husband and I find a home that met our needs. Although our home was a drive for Roseann, she was always very responsive and happy to meet us for a walkthrough when needed. She was incredibly knowledgeable and professional for each walkthrough and helped point out things we might not have initially seen.
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- Stacy Hanas
"
Roseann O'Keefe is a very effective and experienced realtor. She helped us sell our home in a very short time. She is considerate of all parties. I highly recommend her for your real estate needs.
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- Charlene Fruda
"
John's extensive market knowledge, both of the selling and rental landscapes provided me with the insights needed to make informed decisions about my property. His practical approach was particularly valuable. He didn't just list my options; he delved into detailed analyses, presenting scenarios for selling outright, renting, and even a rent-to-sell strategy. His expertise shone through as he explained the potential returns and market dynamics associated with each option. In an industry where agents might prioritize their commission over client needs, John stood out by focusing on what was best for me and my property. He was upfront about the pros and cons of each decision, especially in screening potential renters. John has a keen eye for detail and a knack for problem-solving, qualities that were crucial in managing the complexities of tenant selection. John truly functioned as a trusted real estate "consultant," offering practical recommendations and genuine care for my best interests. I would highly recommend John to anyone looking to navigate the complexities of the real estate market with a reliable, expert, and honest partner at their side.
"
- user0078818 (via Zillow) (Zillow Review - Found a tenant for a Single Family home in Warren, NJ)
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“Roseann O’Keefe is the ultimate professional. In record time she had my house staged, photographed listed, and sold - at asking price. She covered every detail, crossed every t, dotted every i, made sure I had all the resources that I needed in order to have a successful sale as well as a successful purchase, which also happened in record time and went as smoothly as possible. Every recommendation she made, for attorney, mover, stager, painters, etc., were best in class no issues, no problems, some frustration as will happen with any move, which is trying and stressful. Yet, Roseann was there for me every step of the way, answering so many questions following up on so many moving parts and piece. She is, in a word, amazing. Happy to provide my strongest endorsement to this ultimate professional with the warmest heart and sharpest mind. Wishing her continued success as she makes people very happy before during and after the move. I couldn’t be more pleased. Thank you, Roseann!”
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- Nora Tsivgas
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John did an incredible job helping us sell our house. His knowledge and marketing skills are best in class in the industry. If you want to get the best value for your house, you should use John - an incredible talent!
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- jmraymond322 (via Zillow) (Zillow Review - Sold a Single Family home in 2023 in Warren twp., NJ)
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We couldn't have asked for a better real estate agent than John Mangini. From our very first meeting, John impressed us with his knowledge, attention to detail, and thorough market analysis. He took the time to understand our goals and always made sure we had the information we needed to make confident decisions.
Selling a home could have been stressful, but John made the entire process feel easy. He was always responsive, patient, and willing to answer every question we had. We never felt rushed or pressured just supported every step of the way.
What truly sets John apart is that he genuinely cares about his clients. His professionalism, honesty, and dedication gave us complete confidence throughout the process, and his expertise helped us achieve a successful sale.
We are incredibly grateful for everything John did for us and would recommend him without hesitation to anyone looking to buy or sell a home. If you want someone who is knowledgeable, trustworthy, and a pleasure to work with, John is the person to call.
"
- user03337519 (via Zillow) (Zillow Review - Sold a Single Family home in 2026 in Warren twp., NJ)
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“Roseann O'Keefe embodies the rare combination of a consummate Real Estate professional with an endearing heart of a true empath. Mrs. O'Keefe coordinated all details of the transaction seemlessly and exemplifies the reason top level Real Estate agents provide such a vital service. ”
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- Anthony Lowenberg
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For this senior, single homeowner making a first home sale, John was the perfect choice.
Having regularly received John's data analysis mailings of the real estate market in Warren, I knew he had a deeply studied knowledge of home values. When my time to move arrived, I read his numerous client reviews as well. Now, post home closing, I can heartily verify the excellence expressed is definitely not overstated. Although visitors to my home regularly made positive comments, John's recommendations for bringing it to market readiness yielded most welcome results. Contracts came in quickly from the well-attended Open House. In 2025's turbulent market, John's extensive expertise and professional demeanor quickly gained my confidence. His willingness to help with the smallest details, thorough explanations of every step of the process, and quick response to my calls, confirmed throughout that I could not have made a better choice for a realtor.
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- usm505 (via Zillow) (Zillow Review - Sold a home in 2025)
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I'd like to highly recommend my real estate agent, John Mangini, to anyone looking to buy or sell a home. From start to finish, John was incredibly professional, knowledgeable, and easy to work with. He took the time to understand exactly what I was looking for and guided me through every step of the process with patience and expertise.
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- user654411 (via Zillow) (Zillow Review - Sold a Single Family home in 2026 in Warren twp., NJ)
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Roseann was our ride or die as first time home buyers. For two straights years and 10 offers deep. The level of patience and tenacity she demonstrated consistently is almost unreal. And to think Zillow paired us together by chance – we won the lottery to be able to work with the best. This is not a paid ad; we may name our firstborn after her. Run, don’t walk – Roseann is truly the way, the truth and the life your home search needs.
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- Tatiana Javier
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I highly recommend Deb's services. She is exceptionally friendly and fully dedicated to guiding you through the process of buying or selling your dream home.
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- Ivan Cevallos
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John was very helpful & easy to work with. Selling process was explained clearly & all questions were addressed timely. Listing price was spot on ! & house sold quickly for more than asking. I would definatly reccommend John for all your buying/selling needs !
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- ddbwater (via Zillow) (Zillow Review - Sold a Single Family home in 2025 in Warren twp., NJ)
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Deb has been a dream to work with and work alongside of. There was an instant connection and comfort that, even though she is a wealth of knowledge and this is her field, she makes it a completely safe space to ask questions (sometimes five times over) while patiently acknowledging and explaining. She supported our family every step of the way. As much as I did not want to take advantage of her flexibility and grace, It gave me great comfort knowing she was only ever a phone call away. Deb brings such a humanistic approach to an otherwise stressful but exciting but emotionally heavy time in life. She maintains full transparency while also validating and supporting concerns; there was no aspect of the house selling process I felt I couldn't ask Deb about. I'm proud and privileged to have established both a professional and personal relationship with her, one that I'm certain will stand the test of time and would not hesitate to put her in touch with any of my loved ones, you are a league all your own, Deb!
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- Nola Seader
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Roseanne goes far beyond simply treating us like clients, she truly treats us like family. We have worked with her for nearly 10 years, and throughout that entire time, she has never disappointed us once. Every step of the way, she has gone above and beyond, often outside the scope of her duties, just to make sure we were comfortable, informed, and satisfied.
Our most recent situation really stands out was when we had to sell our home in New Jersey while living in North Carolina. As you can imagine, it was an extremely stressful process because we couldn’t always be there in person. Roseanne stepped in and handled so much on our behalf. Meeting with vendors, coordinating with potential buyers, checking on the property, and making sure everything stayed on track. She truly was a godsend during that process and helped alleviate so much stress for our family.
I honestly cannot praise her enough for everything she has done for us over the years. Her communication skills are outstanding, and no matter how overwhelming or stressful the situation became, she always remained pleasant, professional, and positive. Every interaction with her was met with kindness and a smile.
If anyone ever has the opportunity to work with Roseanne, I would recommend her 100% honestly, 1,000%. She is truly a gem, and we are beyond grateful for all of her hard work, dedication, and support.
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- Kevin and Jacqueline John
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John made the whole process smooth as glass. He anticipated my needs every step of the way and made it easy to sell my property. All the advice he gave me for finishing touches and the care and attention to detail he paid to the photos and the listing were worth every penny.
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- mryder1991 (via Zillow) (Zillow Review - Sold a home in 2024)
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Roseann was amazing and we would recommend her to anyone looking to buy or sell a house. Whether you’ve already started the process or are brand new to owning real estate Roseann would be an asset to you. As first time home buyers you can only imagine the number of questions we had. Roseann was very knowledgeable and thorough throughout the whole process. As stressful as buying a house is, Roseann made sure looking at houses and learning the ins and outs of buying a home was as worry-free as it could be, always helping us do what is best for us every step of the way. If one day we decide to move we would be happy to work with Roseann again. Thank you!
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- Catherine Gambourg
"
John was critical to the successful sale. Interacting with town officials to be certain all inspections were cleared and certificate of occupancy was issued in a timely fashion. He also coordinated with the buyers broker to be sure they had what the needed cleaned up on final walk thru. He stayed with the project til the closing was official.
"
- danc88 (via Zillow) (Zillow Review - Sold a home in 2026)
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Roseann was extremely helpful on the closeout of the sale of our house. From making trips to the town to close out open permits, to managing communication with the buyer, to providing move checklists and reminders, to completing paperwork, her thoroughness ensured the smooth transfer of our house. Thank you very much Roseann! Chad D – Green Brook
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- Chad D.
"
Roseann O’Keefe helped me sell my home, and I truly couldn’t have asked for a better experience. She encouraged me to list at the right time to take advantage of low inventory, and her thoughtful insight made all the difference in achieving a successful sale.
She was especially compassionate and understanding of my situation, knowing I was making this move later in life and handling everything on my own. Throughout the entire process, her communication was exceptional. She kept me informed, explained every step clearly, and always helped put my mind at ease.
Her ability to negotiate with potential buyers was outstanding, and I always felt she had my best interests at heart. She cared for me as if I were family, offering both professionalism and genuine kindness from start to finish. I was also fortunate to receive more than my asking price, which was an incredible outcome.
I can’t thank her enough for making what felt like a daunting move feel completely manageable and real. She truly made it easy.
She is a true gem and a wonderful human being. If I could give her more stars, I would. I would highly recommend her to anyone looking to buy or sell a home.
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- Carol Patrick
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John was my realtor for sale of my house in warren. I couldn’t have asked for a better representative. Simply Selling a house is not what a great realtor does. It also requires promptness,, patience and experience in the applicable market. A good realtor like John can advise on repair contractors if needed, movers and other service assistance. And of course , it requires someone who is a good go between with the other realtor. John did it all. He was always available when I called. He would meet personally whenever needed. And if I had a question, he either knew the answer or researched it for me. If you are thinking of selling or buying. John and his team are really thr best choice by far . I am positive he won’t disappoint you!
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- Robert Fagella
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At a time when my mom was ill and needed to move with my dad to an apartment closer to where I lived so I could take better care of mom, Debra got straight to work finding that place. She was responsive, nimble, and compassionate. She worked hard to ensure my parents moved to a safe, beautiful place, just down the street from me!. I'll forever be grateful for her. She was stellar . - Anna
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- Anna
"
Chris was outstanding in assisting us to find a lovely home. He was very understanding of our needs and accommodated all our requirements.
We would recommend him to anyone who’s in the market to buy a property.
Mahadevan and Janaki
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- Janaki Mahadevan
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We had excellent experience working with John Mangini on the sale of our home recently. With over 20 years of real estate experience, he has an in-depth understanding of the local market and provided valuable insights throughout the entire process. He was always on top of every detail, dedicated to making sure things moved forward smoothly, and offered tremendous help when it came to dealing with the buyer. His professionalism, punctuality, and commitment truly stood out – he was always on time for every meeting and consistently went the extra mile. We would highly recommend John to anyone looking to buy or sell a home.
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- Wei Lin
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Chris was a pleasure to work with. He understood what we were looking for in a home, and went out his way to find listings and adjust his schedule to meet us for viewings. Chris is extremely knowledgeable about the real estate market, and he's well versed in home maintenance and minor renovations (if a home needed to be adapted.) Chris is diligent, competent, and he was attentive to our needs - a real pro and an extremely nice guy!
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- Diane Halvorsen
"
“Working with Roseann O'Keefe was an amazing experience from start to finish. Over the past several months, her deep experience and guidance made the entire process smooth and stress-free. She was always proactive, knowledgeable, and dedicated to our best interests. My wife and I are truly grateful for her support and highly recommend her to anyone buying or selling a home!”
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- Minha and Yuyeon Han
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Roseann helped us find our home and we can’t recommend her enough. The market was tough — we got outbid more than once and hit issues with sellers that were completely outside her control — but she stayed calm, persistent, and always had our best interests at heart. She went well beyond what we expected at every step and got us to the finish line. If you want a realtor who genuinely cares about her clients, look no further.
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- Evan Dill
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When I first started the process of selling my home, I knew it wasn’t going to be easy. The market was challenging, and I knew I needed someone who would truly go above and beyond. Roseann is not only an exceptional realtor, but an exceptional human being.
Roseanne worked tirelessly on every single detail to make my home look its absolute best. She was there for everything — from preparing and presenting the house to handling all the little things that made such a huge difference. She didn’t simply put my house on the market and wait for a buyer. She truly cared. She treated my home as if it were her own.
And somehow, she accomplished what at times felt almost impossible: she sold my house in just 45 days.
But the most important thing I want to say is that Roseanne became so much more than my realtor. She became my friend. She became like family.
She is one of those rare people who brings kindness, compassion, and genuine care into everything she does. She works incredibly hard for her clients, while at the same time dedicating herself to helping others.
If you are looking for a realtor, I cannot recommend Roseanne highly enough. You will get an outstanding professional, but even more importantly, you will get a beautiful human being who genuinely cares about the people she works with.
Roseanne, thank you for everything you did for me. I will never forget it. ❤️
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- Paula Arocha
"
We recently sold our home with Roseann O’Keefe and we can’t recommend them highly enough. From our very first conversation, she was professional, knowledgeable, and genuinely listened to what we wanted. She gave us a realistic market analysis, helped us price the house right, and guided us through every step—no surprises, no pressure. She coordinated everything smoothly with the photographer and inspectors, and her negotiation skills helped us get a strong offer. If you’re thinking of buying or selling, do yourself a favor and work with Roseann O’Keefe—caring, competent, and truly invested in their clients. Thank you again for making this chapter so positive for our family!
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- Joseph Monte
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I had a wonderful experience working with Roseanne! She was professional, generous, patient, and truly went above and beyond to make the entire process smooth and stress-free. She was always available to answer questions, listened to my needs, and made sure I felt supported every step of the way. I truly appreciate her kindness, honesty, and dedication. I highly recommend Roseanne to anyone looking for a trustworthy and caring real estate professional!
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- Sister Verna
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I’m so glad that I chose Roseann as my real estate agent for the recent sale of my home. She was incredibly knowledgeable, experienced and a kind real estate professional. Roseann is compassionate, patient and reliable. She is so strategic and skilled at negotiating. I knew I was in good hands with her because she expressed care, listened to my concerns but also provided great guidance. Roseann is communicative, transparent and empathetic. I highly recommend her because she works hard for her clients.
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- Yasmin Lashley (Seller)
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John was a critical part of getting to the finish line on our home purchase. Always responsive and providing valuable knowledge along the way so we could keep the process moving. A pleasure to work with! Also very knowledgeable about the area.
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- Sharon Henderson
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John was very knowledgeable, professional and helpful in every possible way in selling our Warren home. He really went above and beyond providing help with his valuable resources. He even spent time with many trips to storage for us. The whole family was very grateful for John's help in making this selling experience a successful one.
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- Leeanne Wang
"
Roseann did a great job assisting me with the sale of my Mom's condo. Roseann started by touring the condo and making suggestions on simple things that we could do to make the home more attractive to potential buyers. She did this all while being sensitive to my elderly Mom's needs. She then did her research and came back to us with a selling price recommendation which we went with. Before the home went on the market, she came in and staged the condo to look its best. All of these things lead to many interested buyers, multiple offers and the house under contract within a week! Finally, she supported us all the way through the closing advocating for us when needed. Roseann was a great help and I would definitely recommend.
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- Joanne M.
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Excellent Agent
John Mangini guided us through a very difficult decision - to sell our home of 38 years. All phone calls to John were answered or returned promptly. John was always polite and reassuring, always answering our concerns. We lived out of state when our house was listed with John. John and his assistant, Laura Healy took great care that our unoccupied house was well cared for - staging done, etc.
Overall , John Mangini went the extra mile as a Real Estate Agent.
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- chagman62 (via Zillow) (Zillow Review - Sold a Single Family home in 2016 in Warren, NJ)
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John was wonderful to work with, knowledgeable, patient. Everything we needed to make the process easy. I would highly recommend John to anyone who is thinking about selling their home.
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- beverleyslobo (via Zillow) (Zillow Review - Sold a Single Family home in 2026 in Warren twp., NJ)
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From our very first meeting, I was confident Roseann was the right broker to help us sell our home. Once we decided to move forward with her, she didn’t just meet our expectations—she exceeded them. Roseann was consistently punctual, responsive, and attentive. Whether by phone, text, or email, she communicated promptly and clearly, always providing thoughtful answers to our questions.
Her communication skills are exceptional, and her depth of knowledge in real estate is evident. She’s not only highly competent, but also empathetic and accessible. Those qualities made a stressful process feel manageable. Roseann’s dedication made us feel like we were her only client, and that level of personal attention is rare.
She is, without question, the epitome of what you hope for in an elite real estate professional.
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- Robert I.
"
John Mangini is the real MVP when it comes to the entire process of preparing, pricing, showing, and negotiating for a successful sale of a prized residence. His data-driven approach and knowledge of the market frame the sale pro-forma, and his constant communication and negotiating skills make the execution professional and timely.
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- buoys library0z (via Zillow) (Zillow Review - Sold a Single Family home in 2026 in Warren twp., NJ)
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John put extra time and effort to make this deal happen on time where I had to do 1031 transfer to another property. Timely closing was really important to me and John made this happen as he was on top of all the issues on daily basis and kept me up-to-date on everything with this closing.
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- gurindergill20083 (via Zillow) (Zillow Review - Sold a Vacant Land home in 2023 in Warren twp., NJ)
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Christopher foremost is a caring person rather than a realtor. During our association he was very knowledgeable and responsive to our concerns. Quickly he knew exactly what were looking for and made sincere efforts to find the home for us. Patiently he answered all our questions and went all out to find answers for things he did not know. We strongly recommend Christopher.
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- Sanganur Mahadevan
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"Roseann was fantastic throughout the entire process of finding our forever home. She is exceptionally knowledgeable, always professional and so personable, too. It was a pleasure dealing with all of our important decisions having Roseann's ever patient and always available support. My husband Jim and I highly recommend Roseann O'Keefe to anyone wanting to make a home sale or purchase with confidence that it will be done right."
"
- Kate Washington
"
It was a pleasure working with John. He did an outstanding job and handle the sale very professionally. He was very helpful assisting with negations and leading us to a final agreement. I would definitely use him again.
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- queniacd (via Zillow) (Zillow Review - Sold a home in 2023)
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“I’ve used Roseann on 3 occasions (2 sales and 1 buy). The first sale she sold within months after a year with a different agent who couldn’t get it done. She is a professional and expert in her field, knows how to deal with people and all that can happen during real estate transactions. I recommend her to everyone I know. ”
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- Meredith Allen
"
John is by far the best realtor to work with! His marketing skills, expertise and professionalism are exceptional. He is always available for questions and goes above and beyond to get the house sold! We were so impressed with him and highly recommend him for buying or selling your house!!!!!
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- kxz7fcv9gk (via Zillow) (Zillow Review - Sold a Single Family home in 2023 in Warren twp., NJ)
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John Mangini did an outstanding job in selling our house. John's knowledge, professionalism and guidance through every step in the process was truly remarkable. His recommendations with respect to listing price, house staging, marketing strategies and bid negotiations made him an invaluable resource. I will never buy or sell real estate without John in my corner.
"
- the4kellers8 (via Zillow) (Zillow Review - Sold a home in 2025)
"
John was an excellent realtor and a pleasure to work with throughout our home purchase. He was knowledgeable, responsive, and guided us through every step of the process with clarity and confidence. We always felt well-informed and supported. Highly recommend John to anyone looking for a reliable and trustworthy real estate professional.
"
- Prajeet Gadekar (via Zillow) (Zillow Review - Bought a Single Family home in 2025 in Warren, NJ)
"
John was critical to the successful sale. Interacting with town officials to be certain all inspections were cleared and certificate of occupancy was issued in a timely fashion. He also coordinated with the buyers broker to be sure they had what the needed cleaned up on final walk thru. He stayed with the project til the closing was official.
"
- danc88 (via Zillow) (Zillow Review • Sold a home in 2026)
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