212-729-5712, Ext. 118


Upon graduating high school in his hometown of Charlottesville, VA, Sumner moved to Maine to study at Bates College. In addition, he studied abroad at the University of Nanjing in China and holds a teaching certification from the University of Cambridge. Sumner lived and taught in Japan and France for 2 years before returning to the States to work in healthcare sales where he built a $3.4 million portfolio of new business.

Throughout Sumner’s broad experience in multiple industries across the globe, from teaching, to for-profit sales, to non-profit account management, customer service has always been his prime focus and motivator. His strong desire to help people and build business through new relationships has been the cornerstone of Sumner’s professional success and the defining characteristic that allowed him a seamless transition into a real estate agent. Following up on his desire to enter the real estate industry, Sumner managed a private association of commercial brokers where he succeeded in growing the membership base by over 10%.

In his downtime, Sumner enjoys putting together his latest culinary experiments, seeking out new sights in the city, speaking French to whomever will listen, volunteering, and playing competitive soccer.

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$749,000 exclusive

22 Irving Place, APT 5C Co-operative in Gramercy Park  

1 Bedrooms
1 Bathrooms
N/A Square FT

UNDER RENOVATION - First open house Sunday !Rare, extremely LOW MAINTENANCE on this nicely renovated one bedroom with walk-in closet featuring an open modern...

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$5,582 / mo exclusive

The Eugene , PH 2B Condominium in Hudson Yards  

1 Bedrooms
1 Bathrooms
N/A Square FT

Elevate your point of view from this beautiful Penthouse in Hudson Yards! With unobstructed views of the NYC skyline, Hudson River, and Empire State Building...

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Curve, APT 2C Multi-Family in Williamsburg  

1 Bedrooms
1 Bathrooms
N/A Square FT

Spacious and sunlit one-bedroom is now available in the heart of Williamsburg. This apartment features vaulted ceilings with dual exposures facing South and ...

Address Beds Baths SQ ft Price
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71 Clara Street 3 3 2,200
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315 West 33rd 1 1 750
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200 West 72nd Street 1 1 500
330 West 39th Street 1 1 650
309 5th Avenue, 1 1 500
8 Spruce Street 1 1 550
605 West 42nd 1 1 550
75 West End 1 1 575
1 North 4th Place 1 1 550
400 East 58th 1 1 600
180 Water Street 1 1 500
43-10 Crescent St 1 1 700
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Sumner Crosby helped me find my fantastic new apartment in Manhattan and I can’t say enough good things about him! I met him on the phone from my home in Los Angeles and upon my arrival in New York, he had set up a full day to view buildings that he thought fit my criteria. He was spot on with each apartment we went to see. I am an Interior Designer by trade, so I must admit I am quite a perfectionist and knew exactly what I wanted. He put up with me with a smile and a great cheery disposition. Taking me from West Midtown to Downtown and everywhere he thought would suit me in between, in my very hurried time frame. We had a great fun day, and I have made a new friend. He always returned my calls, texts, and emails immediately and made me feel very pampered. Even after I had decided on one apartment and woke up the next day with second thoughts, he didn’t try to pressure me into anything. Rather he supported my thought process and in the end we found the perfect place! I can’t recommend him highly enough, anyone who is lucky enough to work with Sumner will have a wonderful, positive experience. - Susan N.

I worked with Sumner Crosby for a very short time in the summer while looking for a studio apartment that was both conveniently located and decently priced. Of course finding both in the city is difficult, but Sumner was very patient with me and dedicated to find me the perfect fit. I could tell that he was very professional and knowledgeable. He asked all the right questions even when I didn’t think to ask them. Within a day, I found the right place for me. As soon as I decided on the apartment he went right to work on getting all the correct paperwork over to me as he knew I was on a time crunch. The lease signing went by painlessly without complications. Even when I had a couple of minor problems with my apartment after moving in, he helped to deal with the problem right away. He still checks in periodically to see how everything is going with the apartment. Sumner is great at what he does and I would definitely recommend him. If you want quick and painless results when shopping for real-estate choose Sumner Crosby. - Emma L. ​

Sumner demonstrated his professional literacy and patience in helping me find an apartment in Manhattan. He is a very good broker who paid a lot of attention on searching the buildings which are suitable for me and always was able to answer the questions that I asked. Furthermore, Sumner is punctual and considerate. I would like to say thanks for leading me to look through several apartments and explaining all the significant details to me. - Quanling X.

Sumner is a rare gem of honesty and integrity in the New York City real estate world. He will work hard to make sure you get a good deal which is a lot more than one can say for most of the other agents out there. - Peter

Thanks to Sumner I found my ideal apartment. He was diligent, a great listener and very responsive. He was great to work with! - Doreen D.

I had the pleasure of working with Sumner under a tight deadline and with very specific needs. After a quick conversation about what I was looking for, Sumner was quick to set up viewings at a number of buildings that fit my criteria. Over the course of a few days, Sumner worked efficiently to determine the best fit for my new home. An excellent listener and communicator, Sumner always kept me aware of next steps and my responsibilities throughout the process. In no time at all I had signed a new lease at a building that I couldn't be happier with. I highly recommend Sumner to anyone looking to avoid the stress of the new home hunt in New York City - you will be in excellent hands! - Jeff. L

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