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Dean Shaun Mastrangelo

Residential real estate Attorney at Syosset, NY

5.0   5 reviews
  • Licensed for 25 years
    State NY
    Acquired 1999
    Currently Registered No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Dean

Learn Dean’s areas of practice.

I have been practicing law for over 17 years.  Most of my experience is in real estate law. I have represented buyers, sellers, lenders, and title companies in real estate transactions for almost 20 years. 

Photos and videos

I was invited by Marist College to witness Bryant Gumbel's lifetime achievement award ceremony last year.


Law Office of Dean Mastrangelo
575 Underhill Boulevard
Suite 203
Syosset, NY, 11791

Residential Real Estate lawyers nearby


5.0 / 5.0
  5 customer reviews
5 Star
4 Star
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1 Star
Posted by Paola | September 2, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Knowledgeable and honest
I was on the verge of losing my home of 19 years and needed to find a solution quickly. Dean came highly recommended by my Real estate Broker, and my nephew had used him for a home purchase in the past. After meeting with Dean and going over the options, I knew he would be the one to represent me. Even with all the ups and downs of the deal, Dean was very patient and reassuring. He is honest, professional, and a rare gem among real estate lawyers. I had a sense of peace after speaking with him and knew things would work out.
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Posted by anonymous | July 30, 2021
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Very Happy
Very happy with Dean. Very professional and made our home buying experience flawless.
Posted by Eric | April 6, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Extremely HAPPY client
Dean Mastrangelo has gone above and beyond for me and people I have referred him. In a time of crisis with a bad tenant and a mortgage fraud issue. Dean's knowledge and expertise guided me through these situations. Dean was there for me as an attorney and a friend. Any real estate transactions, issues or otherwise I will only use Dean, and only recommend Dean to everyone I know.
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Posted by Mike | April 6, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Professional experience with a personal touch!
The law firm of Dean Mastrangelo handled closings on multiple properties for us and every time the process was laid out simply for us. He caught mistakes at closings made by the other attorneys and saved us money every time. We highly recommend The Law Firm of Dean Mastrangelo.
Posted by Sebastian Davis | August 14, 2015
This review is from a person who hired this attorney.
| Hired Attorney
When you've had the rest ? Then you must try the best"!
What can I say except thank you," for a hassle free closing ! Simply hassle free it's never any stress with Dean as your attorney he is simp,y one of the best if not the Best in my opinion. I have never seen attorney go above and beyond as Dean did for us recently, when our landlords of 12 yrs decided to sell the home we rented. Thank you for the many answers you provided to my sometimes ridiculous questions but you treated each one as it was important as the next. You are a gentleman & lifesaver on many occasions! Thank you so much in assisting us in our new home purchase Lola & Daisy our retrievers thank you as well as you saved us the hassle of having to move and trying to find a place that excepts dogs plus to move over 10 yrs of stuff is no easy challenge plus the expense alone would have been as down payment on a home. So thank you Zillions from our hearts to making our home buying experience easy!
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  • Free Consultation 30 minutes
  • Hourly Rates $ 225-275 per hour
  • Retainer Sometimes
Payment methods
Cash, Check


AVVO RATING 6.5 (Good)

Work Experience

  • President
  • Law Office of Dean Mastrangelo, PC
  • 2002 - Present


  • Roger Williams University, School of Law
  • JD - Juris Doctor
  • 1998
  • Marist College
  • BA - Bachelor of Arts
  • 1992


  • BNI
  • Member
  • 2015 - Present
  • Delta Theta Phi
  • Member
  • 1995 - Present
  • Pi Kappa Delta
  • Member
  • 1989 - Present
  • Sigma Phi Epsilon Fraternity
  • Member
  • 1988 - Present
  • Better Business Bureau
  • Member
  • 2015 - 2016
View all associations

Languages Spoken

  • English

Honors and Awards

  • Varsity Debate State Championship
  • New York State Forensics Assoc.
  • 1992
  • Scott Key Award
  • Sigma Phi Epsilon Fraternity
  • 1991


  • Graduation Thesis at Roger Williams University School of Law
  • A Reasearch Guide to Obscenity
  • 1998

Speaking Engagements

  • Weekly Educational Seminar
  • Understanding Real Estate Contracts
  • 2017

Attorney endorsements

Received (1)
Given (1)
Endorse Dean
Real estate Attorney | Apr 11
Relationship: Other
"I endorse this lawyer. Mr Mastrangelo's comments on Avvo indicate a strong knowledge of New York real estate law."
Divorce and separation
Syosset Residential real estate Lawyer Dean Shaun Mastrangelo
Dean Shaun Mastrangelo
Residential real estate Attorney
Syosset, NY
Licensed for 25 years
Free Consultation