Karen Kostiw's extensive background in real estate and finance allows her to uniquely understand her clients' needs and concerns in today's fast-paced market. As a former financial services executive with extensive team-building and negotiation experience, Karen has the proven ability to meet and exceed her client's goals. Karen utilizes a project management discipline to ensure all steps in the real estate transaction process move smoothly and stress free. Karen's extensive professional and personal network, which includes bankers, contractors, and design professionals, allows her to assemble the perfect team for each of her clients.

Karen enjoys building relationships through increased understanding, honesty and trust to foster inclusion in all aspects of the buying and selling process. She is an empathetic listener, responsive to her clients' inquiries and drives forward to achieve amicable solutions to real estate dilemmas.

Prior to residential real estate sales, Karen held a successful tenured position on Wall Street where she both analyzed residential mortgage debt offerings and managed client relationships.

Karen was raised on the North Fork of Long Island and has resided and worked in Manhattan since graduating college. Karen is currently living in the Chelsea neighborhood of Manhattan with her husband who is also in the real estate profession as a private lender and developer in the tri-state area. Karen currently volunteers at the NYU Career Services Center, is a New York Cares Kaplan SAT tutor, and a SIFMA Invest Write Essay Judge. She enjoys the arts, cooking, running, playing tennis in Central Park and exploring the neighborhoods and restaurants within the five boroughs.

Karen is a dual licensed salesperson in New York with Warburg and in New Jersey with Elite Realtors. She is a member of the Real Estate Board of New York (REBNY) with a board-certified designation of New York Residential Specialist (NYRS®), as well as a member of the National Association of Realtors and the Multiple Listing Service of Garden State, New Jersey and Hudson County. She is also a member of the Financial Executive Networking Group (FENG), Risk Management Association (RMA) and Society of Human Resource Managers (NY SHRM).

Visit my website: KarenKostiw.com


Brick Underground
Karen Kostiw comments. https://www.brickunderground.com/buy/buy-curious-what-new-yorkers-need-to-know-about-moving-to-weehawken
Apartment Therapy
Wendy Arriz and Karen Kostiw comment. https://www.apartmenttherapy.com/real-estate-agent-hiring-36646585
Karen Kostiw, Nicole Durosko, and Steven Gottlieb comment. Porthole Windows: They’re Not Just for Ships and Boats
Karen Kostiw comments. https://www.realtor.com/advice/buy/what-does-move-in-ready-mean/
Karen Kostiw and Nicole Durosko comment. Incorporating Dome Ceilings in Your Home’s Design
Real Estate Weekly
234 W21st St. #55 by Gannon Forrester and 225 E36th St. 8H by Karen Kostiw mentioned. DONE DEALS: Big deal on little house in Park Slope
Apartment Therapy
Broker Karen Kostiw comments. https://www.apartmenttherapy.com/landscaping-mistakes-36616688
Apartment Therapy
Karen Kostiw comments. https://www.apartmenttherapy.com/fixer-upper-real-estate-legacy-35819141
Karen Kostiw pens a column. https://www.inman.com/2019/05/10/how-to-explain-home-inspections-to-buyers/?utm_source=dailyheadlines&utm_medium=email&utm_campaign=localnewsletter&utm_content=733287_textlink_7_
Karen Kostiw comments. https://www.realtor.com/advice/buy/pros-and-cons-of-writing-a-personal-offer-letter/
Karen Kostiw comments. https://freshome.com/buying-fixer-upper-considerations/
Agents Gill Chowdhury, Karen Kostiw, and Wendy Arriz comment. https://www.brickunderground.com/buy/what-is-a-nyc-pied-a-terre-bricktionary?utm_source=Brick+Underground+Newsletter&utm_campaign=4022ac7ff4-EMAIL_CAMPAIGN_2019_03_07_08_00&utm_medium=email&utm_term=0_2fdec7634c-4022ac7ff4-85748141
Apartment Therapy
Julia Leigh Surgeon, contact of Allison Chiaramonte comments; Jennifer Weisberg, contact of Eric Mendelsohn comments; Kelly Rosen Lagrange, contact of Karen Kostiw comments. https://www.apartmenttherapy.com/open-concept-layout-mistakes-266464
Apartment Therapy
Karen Kostiw talks about how to learn about your landlord before moving in. https://www.apartmenttherapy.com/questions-to-ask-landlord-before-moving-in-264592
House Method
Alex Lavrenov and Karen Kostiw talk about things to know when paying off your mortgage early. https://housemethod.com/real-estate/paying-off-mortgage-early/
New York Times
Karen Kostiw featured. https://www.nytimes.com/2018/11/08/realestate/the-beauty-of-a-no-nothing-walk-up.html
The New York Times
Karen Kostiw helps a young, newly married couple find their perfect apartment in Yorkville. https://www.nytimes.com/2018/11/08/realestate/the-beauty-of-a-no-nothing-walk-up.html
Karen Kostiw writes a column about how to stay connected with your clients. https://www.inman.com/2018/10/10/share-a-fall-home-maintenance-checklist-for-homeowners/
Apartment Therapy
Karen Kostiw talks about plants and which landscapes make a home feel like a home. https://www.apartmenttherapy.com/front-yard-plant-tips-landscapers-263338
The Real Deal
Karen Kostiw is featured. https://www.karenkostiw.com/wp-content/uploads/2018/10/10.1.2018-TRD-Charlton-Avenue-.pdf
Wall Street Journal
The photo of Karen Kostiw’s listing in Oradell, NJ and its “For Sale” sign outside was used in a story about national home continuing to increase. http://www.wsj.com/articles/home-prices-continued-to-climb-in-march-1432645221
Mann Report Newswire
Warburg Realty®, one of Manhattan’s leading residential real estate companies, is looking to open its first Brooklyn office in 2014, announced Frederick Warburg Peters, president of Warburg Realty. The firm has also begun the redesign of… More
Press Release
Warburg Realty, one of Manhattan’s leading residential real estate companies, is looking to open its first Brooklyn office in 2014, announced Frederick Warburg Peters, president of Warburg Realty.  The firm has also begun the redesign of… More


Testimonial from Kim

Karen is the best! Being new to the buying process, Karen graciously walked me through each step from the beginning to the closing. I wanted to see as many co-ops as I could to get a better understanding of what I wanted with what was available on the market. Karen’s knowledge and experience in Manhattan realty really helped me filter my list. She also made viewing appointments fast and organized them in the most efficient way so I could maximize my time. She gave me great advice throughout the process and was available 24/7 with answers to any questions I had. She was always very informative, endlessly helpful and a joy to work with throughout this process. She has great recommendations for everything from lawyers to contractors and has great intel about interior design. If you want a broker who goes above and beyond to help you purchase the perfect apartment, I would highly recommend Karen.

Testimonial from Joan & Ed

Selling an apartment in the highly competitive NYC market is a challenge. Karen understood our requirements and became our 24/7 person. She guided us through the process of obtaining painting, and floor contractors as well as plumbers, window washers, etc. Karen was with us from the initial showing through the recent closing. If we were to purchase again in the city, Karen is our go-to-person. Highly recommend her.

Testimonial from Carl and Amy

Karen was very responsive and helpful throughout the home purchase process for my wife and I. She was readily available to chat when needed, took care of answering our questions (or pointing us in the right direction to another resource where applicable), and helped to keep our best interests in mind from beginning to end.

Testimonial from JB and Erica

Karen completely changed my opinion of brokers. She is incredibly professional, mentored us through the process, is formal in a pleasant but warm way, and I’m going to make all of my friends go to her. She was a project manager, negotiator, and a therapist for us every day. Midway through the process, someone casually mentioned that Karen rarely does transactions as “small” as ours – literally had no idea. I always felt like Karen’s highest priority. She immediately responded to all communication, dealt with my first time anxiety, had all of our paperwork done *early*, and never once slipped up. I never thought I would be able to own a beautiful 2 bed in the Upper East Side, and I’m frankly still surprised. There is no way we could have done this without Karen – would recommend her endlessly. I’ll certainly be calling her when it’s time to move into something larger.

Testimonial from Christa

Purchasing property in New York City is a tough endeavor, let alone for someone out of town. Having a real estate agent is just not enough to navigate the obstacles that seemingly arise at every corner. In today’s world you need an agent, advisor, mentor and all-around real estate guru to guide you through the process. Basically, that is Karen all wrapped-up in one. She is amazingly patient yet aggressive when needed, hands on, but not pushy, and goes above and beyond of what is expected of a traditional real estate agent. From locating the perfect apartment, to negotiating a great deal and recommending the perfect attorney, to taking care of the finishing details such as installation of custom closets and designer blinds, Karen made my arrival a seamless journey. So, if you are looking for a modern real estate agent, one that anticipates rather than reacts, then Karen should be your first call.

Testimonial from Juhanh

“Karen was absolutely the greatest. It was a difficult time for my family and I, dealing with the passing of my sister. The process of handling her estate was not an easy task especially with traveling back and forth from Atlanta to New York. We needed someone patient and understanding, someone we could trust and that’s exactly what we got from Karen. Karen was always professional and stayed diligent in her business. As we were getting the property ready, Karen was there through the entire process, from beginning to end. She was focused and aimed at getting the best price possible. After the property was listed, it wasn’t very long before we had a buyer. I have to say that we believe Karen was an angel sent from God. The process was stressful at times, but Karen kept things in perceptive for us. Always on top of things and keeping us well informed. My family and I couldn’t have done it without Karen and we can’t thank her enough, she is highly recommended. Helen, Joi & The Pitts Family”

Testimonial from Edgar and Carmen Romero

In October of 2014, my father was diagnosed with a severe medical condition. He passed away in May 2015. I started looking for options for my mother to deal with her real estate holdings, holdings that she and my father had built up over many years through hard work and perseverance. The true American Dream for Cuban immigrants who came to this country with NOTHING. In the search for someone to help, the only person that stepped up and took a chance with the older widow and her son was Karen. She was patient, supportive, knowledgeable and compassionate at one of the worst and sensitive times of our lives. To that end, she found the perfect fit for us, and worked (and continues to do so) on every aspect of our deal through its eventual closing and rental. She was a Godsend to us. We don’t know what we would have done without her during that difficult time. She is not our realtor. She is a trusted friend. You could not go wrong with Karen on your side.

Testimonial from Vivian

Karen’s unique background in business and liberal arts distinguishes her from other real estate professionals we have worked with in the Tri-State area in general and Manhattan in particular. In addition to doing all the preparations for the listing, Karen sourced the contractors and personally oversaw the renovations we needed to do to get the place in move-in condition. After just open house, Karen secured us an offer at our full asking price. I highly recommend Karen for her expertise and professionalism.

Testimonial from Abhinav and Pooja

Karen is one of the most professional, personable and down to earth real estate agents my husband and I have ever worked with. That says a lot about someone in this cut-throat Manhattan real estate market. She is a breath of fresh air. In our quest for a first home we must have worked with at least a dozen if not more agents. She was by far the best. She is part of our extended family now. Buying our first home was never going to be an easy process however Karen made it amazing. Right from asking us how we imagined our home, to location, the baby’s room and the tiniest details of floors, lighting & utilities. She had it all perfectly planned out. We enjoyed the process of discovery rather getting overwhelmed by it. Open houses were right on target and before we knew it, in a short period of time we had our dream home. Karen was by our side from the negotiation to the walk through and the closing process. One more thing her prior experience in high finance at NY investment bank was a great asset to us. She was able to open doors that very few agents can. We have high regard for her commitment to her clients and her passion getting the right fit for them and most importantly in their budget, which was probably the most important factor for us. We highly recommend Karen for anybody who is planning on buying a property in the NY metro area. Her expertise is not only Manhattan but also Brooklyn & Northern NJ.

Testimonial from Jose and Joanna

Karen is outstanding! She goes above and beyond the call of duty. Always seeing the big picture. If you have no idea where to start. Karen will set the path and take you carefully and clearly through it till the end. She was and still is in touch with us even after the closing. Every decision we made was carefully filtered and vetted. We chose the best neighborhood,schools,shopping and space thanks to all the advise we received. I can confidently say she is a true professional with honors. She was highly recommended by a friend and now we highly recommending her to you. As a first time home buyer I can tell you our experience was not easy. We did our due diligence. In the process we learned so much from Karen and we will always be grateful to her because of it. We got everything we wanted in the end. Whenever we have a question we turn to her still. She is selfless and resourceful. She even had great connections as far any renovations we were looking to make. Saving us thousands of dollars. In the end we feel like the process was quick, pleasant and classy. I’ve got my money on Karen Kostiw.

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