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From Manhattan to Brooklyn—Your NYC Home Search Starts Here

Find Your Next Home with Mark O'Brien Real Estate

Find Your NYC Dream Home with Mark O'Brien Real Estate

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For Sale
MLS® RLS20083344
Listing Courtesy MARK D OBRIEN with MARK O'BRIEN DEVELOPMENT LLC

$1,325,000

110 E 87th Street 2-A, New York City, NY 10128
1 Bed 2 Baths 898 Sq.Ft.
For Sale
MLS® RLS20059088
Listing Courtesy Carl Gambino with Compass

$128,000,000

217 W 57th Street 127/128, New York City, NY 10019
8 Beds 9.5 Baths 11,535 Sq.Ft.
For Sale
MLS® RLS20033199
Listing Courtesy Adam D Modlin with Modlin Group LLC

$90,000,000

157 W 57th Street 64, New York City, NY 10019
8 Beds 7 Baths 10,000 Sq.Ft.
For Sale
MLS® RLS20091070
Listing Courtesy Fredrik Eklund with Douglas Elliman Real Estate

$90,000,000

432 PARK Avenue 64, New York City, NY 10022
4 Beds 5.5 Baths 8,038 Sq.Ft.
Pending
MLS® RLS20073138
Listing Courtesy 1122 Madison Avenue with Corcoran Sunshine Marketing Group

$89,500,000

1122 MADISON Avenue PENTHOUSE, New York City, NY 10028
7 Beds 7.5 Baths 9,350 Sq.Ft.
For Sale
MLS® RLS20088532
Listing Courtesy Richard J Steinberg with Compass

$88,500,000

432 Park Avenue PH88, New York City, NY 10022
4 Beds 6.5 Baths 8,200 Sq.Ft.
Pending
MLS® RLS20041744
Listing Courtesy 140 Jane Street Sales Office with Corcoran Sunshine Marketing Group

$87,500,000

140 JANE Street PH8, New York City, NY 10014
6 Beds 8 Baths 9,532 Sq.Ft.
For Sale
MLS® RLS20060201
Listing Courtesy Jim St. Andre with Compass

$85,000,000

125 Perry Street PHE, New York City, NY 10014
6 Beds 9 Baths 7,700 Sq.Ft.
For Sale
MLS® RLS20061539
Listing Courtesy 50 West 66th Street Sales Office with Extell Marketing Group LLC

$85,000,000

50 W 66th Street 62, New York City, NY 10023
6 Beds 8 Baths 9,678 Sq.Ft.
For Sale
MLS® RLS20068338
Listing Courtesy Eva J Mohr with Sothebys International Realty

$80,000,000

80 Columbus Circle 80th Floor, New York City, NY 10023
6 Beds 8 Baths 8,332 Sq.Ft.
For Sale
MLS® RLS20077721
Listing Courtesy Deborah A Kern with Corcoran Group

$79,900,000

220 CENTRAL Park S 62, New York City, NY 10019
4 Beds 6 Baths 5,935 Sq.Ft.
For Sale
MLS® RLS20099772
Listing Courtesy Deborah Grubman with Corcoran Group

$70,000,000

50 CENTRAL Park S 30/31, New York City, NY 10019
3 Beds 5 Baths 10,875 Sq.Ft.
For Sale
MLS® RLS20061488
Listing Courtesy Serena Boardman with Sothebys International Realty

$68,000,000

4 E 79th Street, New York City, NY 10075
6 Beds 9 Baths 19,050 Sq.Ft.
For Sale
MLS® RLS20067618
Listing Courtesy Fredrik Eklund with Douglas Elliman Real Estate

$67,000,000

432 PARK Avenue 84B, New York City, NY 10022
3 Beds 3.5 Baths 5,421 Sq.Ft.
For Sale
MLS® RLS11015411
Listing Courtesy 430 East 58th Street Sales Office with Corcoran Sunshine Marketing Group

$65,000,000

430 E 58TH Street PH80, New York City, NY 10022
5 Beds 6.5 Baths 9,191 Sq.Ft.
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Mark O’Brien Real Estate

Combining development and brokerage, Mark is responsible for leading the development and sale of over $375 million of real estate transactions primarily in NYC, Greenwich, CT, and New Zealand. Build Me a Brownstone has been building, restoring, and renovating homes since 1999.  

With over $65 million in ground-up construction, with experience using modular and precast construction, historic Brownstone restoration, and residential renovations, Build me a Brownstone has been recognized by the HOBI Awards and Press in Life and Leisure, Remix Magazine, Huffington Post, and Home Style Magazine.

Prior to real estate, Mark founded and built Network Dynamics Inc. in 1986, an Executive Search and Consulting Business headquartered in NYC with 16 employees and over 150 contract consultants on staff with clients such as IBM, EDS, and Merrill Lynch. This was sold in 1999 and launched into residential development and brokerage. Graduate of Iona College in New Rochelle, NY.

agent photo

Meet Mark


Combining development and brokerage, Mark is responsible for leading the development and sale of over $375 Million of real estate transactions primarily in NYC, Greenwich CT and New Zealand.  The OB Team consists of four licensed real estate agents led by Mark and Mark O’Brien Development has been building, restoring, and renovating homes since 1999.  
 
With over $65,000,000 in ground-up construction, with experience using modular and precast construction, historic Brownstone restoration, and residential renovations, recognized by the HOBI Awards and Press in Life and Leisure, Remix Magazine, Huffington Post, and Home Style Magazine.
 
Prior to real estate, Mark Founded and built Network Dynamics Inc. in 1986, an Executive Search and Consulting Business headquartered in NYC with 16 employees and over 150 contract consultants on staff with clients such as IBM, EDS and Merryll Lynch.   Sold in 1999 and launched into residential development and brokerage.  Graduate of Iona College in New Rochelle, NY.
 
 
 
We’re always growing our team click here to learn more.

Mark O'Brien

Real Estate Buy Build Sell Advisor
PHONE
(917) 485-4020
EMAIL
[email protected]
LICENSE NUMBER
10491210021
ADDRESS
94 Bank Street, New York, NY 10014

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Phone

(917) 485-4020

Email

[email protected]

Address

94 Bank Street New York, NY 10014

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