Nobody works harder for their clients than Annie Cion Gruenberger. As one of Warburg’s top brokers for more than 25 years and currently ranked the #2 Top Producer company-wide, Annie has always been dedicated to helping her clients find the perfect property or successfully sell their home.

Many of Annie’s clients are repeat customers or referrals. This is because once you work with Annie, she becomes like family. She has helped many of her clients buy and sell multiple properties over the years, as well as help them eventually purchase apartments for adult children, as well as their family and friends. One example of Annie’s dedication to her clients is that she has handled seven separate transactions over a decade for one family alone.

Annie not only helps her clients with their real estate needs, but continues to be an invaluable resource, providing recommendations for many other types of needs, from contractors and painters, to physicians or tailors. Annie is always willing to share her vast knowledge in numerous areas curated during her 40 plus years living in Manhattan.

Although she resides on the Upper East Side, Annie helps clients find their dream home anywhere in city. She has sold and found properties for clients on the Upper West Side, Greenwich Village, NoMad and beyond. She leaves no stone unturned until she finds what her clients are looking for. When working with sellers, her knowledge, tenacity and market expertise yields swift sales at the best possible price. She is there every step of the way, from price negotiations, board packages, interview preparation, and more. Moreover, her strong relationships with other brokers, attorneys, managing agents and lenders allow her to streamline the purchase or sale process for clients.


Annie Cion Gruenberger comments.
Annie Cion Gruenberger comments.  
15 East 26th Street, Apt 16D by Arlene Reed and Annie Gruenberger featured.
239 East 79th Street, Apt. 13C/14C by Arlene Reed and Annie Gruenberger featured.
New York Times
200 Riverside Boulevard 27A by Annie Gruenberger featured, Annie Gruenberger comments, Warburg data featured.
1435 Lexington Avenue, 7B by Annie Gruenberger and Marilyn Blume featured.
New York Times
Annie Gruenberger’s listing at 1170 Fifth Avenue is featured in the New York Times.
Annie Gruenberger’s listing at 1170 Fifth Avenue is featured in Variety.
Real Estate Weekly
Closing by Annie Cion Gruenberger featured.
Real Estate Weekly
Closing by Annie Cion Gruenberger, Bill Kowalczuk are featured.
Annie Gruenberger is one of the exclusive agents representing a rare seven-story loft building on University Place, on the market for the first time in 80 years.
The New York Times
Annie Cion Gruenberger talks about helping her client, a native New Yorker who moved out of the city, find an apartment back in their hometown.
Annie Gruenberger talks about what really goes into doing a home gut renovation.
530 East 76th Street $4,975,000 6 beds // 4.5 baths 3,305 sq.ft* The sprawling 3,300 square foot is perched high up on the 29th floor and is complete with two sizable outdoor balconies. Featuring an expansive, oversized living… More
The Real Deal
Price: $1,450,000 Listing brokers: Anne Cion Gruenberger and Deborah Ribner of Warburg Realty Address: 200 Riverside Boulevard
Mann Residential Report
With over 20 years experience in the real estate business, Annie has often listed an apartment multiple times over the years, selling it in turn to the previous several owners, as well as helping each of… More
Real Estate Weekly
Season 12 Top Chef contestant Adam Harvey is selling his Sutton Place apartment. The one bedroom at 333 East 55th Street has a brand new, state-of-the-art custom renovated kitchen designed by Harvey. According to listing agents… More
Mann Report Residential
Warburg Realty, one of Manhattan’s leading real estate companies, recently announced its top 10 brokers for 2013.  Longtime Warburg agent Wendy Greenbaum was the leading broker, followed by Richard Steinberg and Jay Glazer. The top ten… More
Press Release
WARBURG REALTY® ANNOUNCES TOP 2013 BROKERS Wendy Greenbaum, Richard Steinberg and Jay Glazer Lead the Firm’s Most Successful Agents Warburg Realty®, one of Manhattan’s leading residential real estate companies, has announced its top 10 brokers for… More


Testimonial from Lisa Kapp

I am so thankful for Annie’s help in making a speedy sale, and ensuring the walk-through was smooth sailing! Although I was initially very sad to sell my apartment-I am absolutely thrilled to be on the Upper West Side. I adore the neighborhood, the building, plus have a larger apartment! It is true… “Everything works out for the best!”

Testimonial from Marcia B. Saft

Annie sold our Upper East Side apartment last fall, and recently sold us another apartment on the Upper West Side.

In both transactions, Annie was an outstanding professional: knowledgeable, responsive and hard-working. She listened to our needs and desires and responded appropriately and timely. We were so pleased with both the buying and selling sides. Annie helped us meet a few challenges in both transactions…again, with great professionalism.

We will happily recommend Warburg, in general, and Annie, specifically, to family and friends for future transactions in New York real estate.

Testimonial from Micheline and Mitchell

Annie took care of all details in our apartment search from the first minute until the very end. She set up  many showings for us despite the low inventory of available apartments.

We highly recommend her if you are ready to buy in the city and we’ll also definitely call her again when we’re ready to upgrade.

Testimonial from Jay Kim

It is with pleasure and gratitude that we share comments on our experience with Annie Gruenberger in the listing and sale of our coop. While we have purchased and sold a number of apartments in Manhattan over the last 15 years, we have never before encountered such a level of experience, professionalism and attention to detail while selling our past coop apartments.

Each phase of the sales effort was superior, such as screening of bid proposals, effective showings, proactive facilitation during the sale negotiations, final negotiations and assembling of the buyers coop board package.  All of these tasks, whether business-related or interpersonal, were accomplished with a high degree of attention to detail and integrity.

Testimonial from Milo Chan

Energetic, responsive, and super savvy about NYC real estate, Annie was our secret weapon when it came to selling our condo and buying a new home within a really tight timeframe. Each step of the way, she helped to inform our decisions, manage our expectations, and calm our nerves. Thanks to her expertise, we sold for a great price and found a new home that we love. She’ll be the first one we call if we move again.

Testimonial from Christina

It is a pleasure to recommend Annie as she consistently delivers satisfaction with every transaction.  Fifteen years ago, I was a newly-married professional when I met Annie as her neighbor on the Upper East Side.  Since then, Annie has advised my family through multiple sales and purchases as our space needs expanded.  As her client, I truly appreciate Annie’s professionalism and integrity, and respect her deep knowledge of the market and excellence in negotiations.  She has the experience, judgment and finesse to successfully navigate complications and resolve differences with diplomacy and fairness.

My Blog

Thinking about buying or selling a home in NYC? NOW is the time! As Warburg Realty’s #2 producing agent in 2019 I reflect on the more than 21 deals I did last year, each one a… More
Gratitude, Trust, and the Upper East Side As we begin a new year, I want to take the opportunity to thank all my clients and express my gratitude for your friendship and business over the years…. More
Featured on by Christy Murdock Edgar: According to Warburg Realty broker Annie Cion Gruenberger, connecting on a deeper level with clients can make you new friends — and make you their lifelong go-to real estate professional…. More
BUYING IN A BUYERS MARKET VS. SELLING IN A BUYER’S MARKET It is still a buyer’s market. Plain and simple.  There is so much inventory (both new construction and resale properties) on the market that buyers… More
I hope you had a great holiday and are enjoying the start of summer. To kick off the season, I am thrilled to welcome you to the first edition of my new newsletter, Ask Annie! My goal… More
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