Mary Karen O'Shaughnessy

Licensed Associate Real Estate Broker

Photo of Mary Karen  O'Shaughnessy

Mary Karen O'Shaughnessy
Licensed Associate Real Estate Broker

At a glance

My Communities
Bronxville, Yonkers, Scarsdale, Eastchester, Tuckahoe, Somers

Working with Buyers and Sellers, Working with Rental Clients

Lives In
Westchester County

Properties Sold

About me

MK has spent her entire professional career in real estate. Having experience ranging from valuation and portfolio analysis to advising on major commercial acquisitions and dispositions, MK realizes that every buyer and seller has unique needs. Her goal is to understand those needs and partner with her clients to make their experience seamless and satisfying.

As the Vice President of Marketing for ING Realty Partners and a Manager at PricewaterhouseCoopers, MK has developed an expertise in sales, client relations, valuation and negotiations. A Certified Public Accountant with a strong attention to detail, MK brings a unique business prospective to real estate transactions.

A 20+ year resident of Westchester, MK recently moved back from Manhattan in August of 2013. She has become an active member of the community. She serves as a board member to the Bereavement Center of Westchester and continues to serve as a committee member for the Central Park Conservancy. She resides in Bronxville with her husband Dave and two sons, David (13) and James (10). They are members of Siwanoy Country Club and the New York Athletic Club.

Professional Awards & Achievements

2016 Top Producer Gold Award 2017 Top Producer Platinum Award  

Professional Associations & Designations

  Member of National Association of Realtors, New York State Association of Realtors, Hudson Gateway Association of Realtors, Hudson Gateway Multiple Listing Service. ABR ® Accredited Buyer Representative SRES ® Senior Real Estate Specialist Certified Public Accountant           


MK is in the Top 1%

I have worked with a lot of Real Estate professionals and I was blown away by MK's level of dedication and attentiveness. She was always on top of everything and went above and beyond every step of the way. Trust me, 95% of the RE agents out there are terrible, lazy, unmotivated and just not good at their jobs. MK is in the top 1%. A rare find. Hire her today, seriously, you will thank me.

Tom W. - July 22, 2015

Sincere Care & Kindness

While I was desperate to find a rental apartment, and did not hear back from other agents, MK helped me very kindly and persistently until I secured a place. After I signed the lease, due to an uninformed problem from the landlord's part, my moving-in had to be postponed. MK followed up the issue very seriously until it got resolved. She definitely went above and beyond her duties and showed sincere care and kindness.

Mo M. - July 28, 2015

Available & Supportive Every Step of the Way

We had a terrific experience working with MK! She is incredibly friendly, patient, and responsive. MK really listened to us and quickly grasped what we were looking for. She was always available to us and supportive every step of the way. MK was a pleasure to work with and I'd recommend her to anyone - but especially those looking to relocate from NYC. She helped us to find our ideal home in Westchester and we couldn't be happier!

Lauren S. - October 22, 2015

Profession Approach v. Pushy

We met MK at an open house an immediately were impressed by her knowledge of the area, willingness to get information on listings, local resources and attention to detail. Her approach is professional versus pushy. She has a great sense of urgency, was always available for questions and  expertly guided us through our first time NY state purchase. We will use MK again should we need to list our house or purchase another. We would highly recommend MK to anyone in need of a realtor.

Elizabeth M. - November 12, 2015

Absolute Pleasure

It was an absolute pleasure working with Mary Karen and Andrea. I met them completely by accident while looking at a new property, and was immediately impressed by their candor, knowledge of the local area and willingness to go right to work. Within a day of meeting them, they provided me multiple listings that met my desires, and more importantly for someone like myself, they were clear to point out all the pros and cons associated with buying each one. Before meeting Mary Karen and Andrea, my experience with real estate agents was distinctly negative. My experience after meeting them, however, was distinctly positive. I can’t say enough about how much I appreciated their prompt, friendly and honest service throughout the process of buying my new place. I highly recommend them to anyone looking for a place to buy or rent in lower New York.

Andrew Manuel - March 16, 2016

The Whole Process was Seamless

MK is wonderful! She was very helpful in the selling of our home. She went above and beyond with utmost professionalism and genuine care making the whole process seamless, timely, and easy. She is very attentive to details, responsive, efficient, and very knowledgeable of the area and market. We highly recommend MK as a realtor who is not only dedicated but truly a pleasure to work with.

Marguerite - January 21, 2016

Professional from Start to Finish

Thank you again for your help in the sale of my apartment. You were very professional from start to finish in staging, photographing, listing and the actual sale process. I appreciated your responsiveness and guidance throughout this process that ended with multiple favorable offers above asking.

Penelope J - June 4, 2017

Proactive and Full of Ideas

"Over the years, we have worked with a number of good real estate agents on both sides of the transaction, but none better than Andrea and MK. We had planned on interviewing several agents to list our home, but after meeting Andrea and MK and seeing their preparation and approach, we hired them on the spot. They were professionals from that point forward--organized, knowlegeable, accessible, proactive and full of ideas to sell our home. And, most importantly, they are nice people. They began as our agents and, several months later, became our friends."

Robert & Simone Gadossy - May 12, 2017

MK & Andrea are Amazing

MK and Andrea are amazing. We have moved many times in the last 10 years and have NEVER had an agent team as effective. Kind, knowledgable, honest, transparent, connected, thoughtful, and funny are just some of the words that come to mind when recalling our time with MK and Andrea shopping for a home in Bronxville. They gave us the inside scoop on every home, neighborhood, restaurant, church and sport. MK and Andrea are fantastic at matching clients with a great home and helping them negotiate, but they are also much more. They are ambassadors, fellow parents, trusted advisors and friends. We simply cannot recommend them enough!

John H - August 10, 2018

An Absolute Pleasure

Working with MK was an absolute pleasure!!! She was so attentive and dedicated to the sale of our home. She was very responsive and timely with any questions that needed addressing during the process and was knowledgeable about issues that would arise with an older home such as ours. I highly recommend her to anyone in need of a real estate agent.

Margaret T. - August 10, 2018

Highly Likely to Recommend

MK is very personable and put in an extraordinary effort to help find the right home for us at the right price. We always felt that she was providing the absolute best information, both macro and micro, which in turn enabled us to make a confident decision either way. There was no unnecessary pressure ever, she spent as much time as we needed throughout the process.

Greg M. - July 24, 2018

A Pro

MK is a pro. In addition to being so pleasant to deal with, she has a depth of knowledge over a broad array of topics that is invaluable. MK developed a great sense of our needs and wants in finding a home and adeptly handled a number of unique challenges that we faced with regard to the home we  ultimately purchased. From financial and tax questions to renovation and design questions, she had thoughtful and well researched answers. But the most impressive aspect of working with MK is how much she cares. I know it's a little cliched, but she really did go above and beyond for us and her concern and conscientiousness were truly genuine. I have no hesitation whatsoever in recommending her and am happy to provide further details if requested.

Janet W. - August 10, 2018