At Turnstone Advisory, we believe real estate is more than a transaction; it is the foundation of your next chapter.
A turnstone is a small shorebird that survives by flipping stones to uncover what is hidden beneath. It thrives through focus, persistence, and instinct for discovery. We do the same for our clients by looking deeper, asking the hard questions, and revealing opportunities others might miss.
With decades of experience across Manhattan and Brooklyn, we combine sharp market insight with thoughtful strategy and uncompromising honesty. For buyers, we uncover possibilities that align with both heart and future. For sellers, we craft precise plans that elevate every detail and maximize value.
Integrity guides everything we do. We believe in truth over convenience, care over shortcuts, and effort over easy wins.
Turnstone Advisory is where strategy meets care, where effort reveals opportunity, and where no stone is ever left unturned.
Working with Greg and his team was the best decision that our family made in the home ownership process. We worked with Greg while selling our apartment and it was not a simple sale, the apartment had water issues and there was...
I was referred to Greg by a trusted friend who couldn’t stop raving about his expertise and results—and now I see why. From the moment Greg stepped into my apartment, he exuded a calm confidence and immediately laid out a visio...
We feel so lucky that our family came across Zach. He provided us with a truly turn key ready professional experience as our realtor. He was thoughtful, attentive to details, and worked incredibly hard to make sure every need w...
We met with 4 realtors before deciding who to list our condo with and Annika was the clear standout. We were already in the process of buying our new home and wanted to sell our place quickly. Annika immediately put us at ease ...
We couldn’t be more thrilled with our experience with Greg and his incredibly capable team. As our growing family expanded from one child to two, we found ourselves in the dual position of buyers seeking out more space, as well...
Working with Chelsea felt less like working with a realtor and more like working with a friend who truly had our backs every step of the way. She was incredibly knowledgeable, responsive, and patient, and made the entire proces...
We cannot thank or praise Elissa Hersh enough for helping us find our beautiful new home on Park Avenue. My partner and I were being relocated to New York for business and we had very specific requirements. We had to be on the ...
When we decided to sell our place, we interviewed a few different brokers, including Greg who came highly recommended by a friend of ours. From the initial meeting, it was clear that Greg was incredibly organized and well-prepa...
Zach and his team at Compass were amazing partners in buying our first apartment (mid-40s couple, dog, cat, no kids), in which they made a potentially confusing and anxiety riddled process into one that was perfectly smooth and...
It was a pleasure to work with Anni on the sale of our Brooklyn coop apartment. Anni was organized, worked tirelessly and at all hours to ensure our questions were answered, that things ran smoothly and that our co-op board was...
We were first-time sellers, crunched for time in a turbulent market that was trending down, and Greg not only guided us through the process but also got us a higher price for our apartment than we’d even thought was possible. F...
Chelsea helped me find my dream home at a time when I truly felt it might not be possible. She struck the perfect balance between being incredibly supportive and genuinely realistic, never brushing off any of my concerns but in...
Working with Zach Crowley as my buyer’s agent was truly one of the best decisions I made during my home search. From the very first apartment viewing to the final day of closing, Zach was by my side—knowledgeable, responsive, a...
Annika was an incredible guide throughout our entire home buying experience. She’s a careful listener, and from day one, she was able to zero in on our family’s needs to identify the perfect home. Anni assisted in crafting a co...
We could not be more pleased with our experience working with Greg and his team. Greg gave us incredibly astute guidance on preparing our apartment for sale. He knew exactly where to invest and instilled confidence in his strat...
Working with Greg redefined our experience with residential brokers. If results are all that matters, he helped us to achieve a sale price well north of our goal. But his process was impressive at every turn. He proposed and co...
Zach is a dream to work with and I cannot imagine having gone through this process (my first time buying) without his help. Not only is Zach very well versed in the Manhattan and Brooklyn markets, but he took the time to educat...
Chelsea is an excellent broker: knowledgeable, responsive, and honest. I worked with her to close on a co-op in Gramercy. She clearly set expectations around the process right at the start and guided me every step of the way to...
I loved working with Annika Grove to find my Brooklyn apartment! I moved to NY from London just over a year ago and she helped me navigate so many hurdles trying to buy a condo with no credit history in the US. She worked aroun...
Elissa helped me purchase my condo in July of 2025. As a first-time home buyer, I wasn’t sure what to expect, but Elissa guided me with great care and went above & beyond expectations. Starting with the search, Elissa asked tho...
Sales Team in NY, NY by Real Trends
Real Estate Professionals Nationwide
Sold in NYC Real Estate
Listings Sold at or Above Ask
2024 Closed Sales
Average Days on Market
