|Corporate Address||805 Third Avenue, 7th Floor New York, NY 10022, phone: 212-712-6000, fax:212-712-6100|
Extell's name comes from the two words that describe the company's philosophy, Excellence and Intelligence. The company was founded by Gary Barnett partnered with Ziel Feldman and has become a nationally acclaimed real estate development company.Extell is known as the most active builder in Manhattan. 
Up until 2005, the company was known as Intell Management and Investment Company.
Durst Organization and Silverstine Properties - focusing on projects around the World Trade Center site and Related Real Estate - close to Extell's total square feet of development, have been Extells greatest competitors in the world of real estate. The major difference between the firms, is how much Extell will be working on at a time, therefore being the most active seller.
Over the years, disputes have a occurred between New York Times over the development of their headquarters, and Donald Trump over a property on the Upper West Side.
The company is currently after more Manhattan projects than any other developer. It is believed that all the companys success has to do with the fact that Barnett is not afraid to take risks. Despite this, he does not plan to expand his mid-sized firm, he is perfectly happy being New York based. 
Representative Buildings by Extell Development
Rushmore, 80 Riverside Boulevard, New York City
Rushmore is located on the Upper West Side of Manhattan and the amenities of the building more closely resemble a resort opposed to an apartment building. The units are 1-6 bedrooms, with unique finished and options between architectural style. Some of the luxury amenities include a billiards room, valet, doorman, concierge and babysitting services.
Aldyn, 60 Riverside Boulevard, New York City
Aldyn is yes, another one of those Donald Trump projects but was purchased by Extell Development Company in 2005. Of its 297 units, 128 are rentals, leaving the remaining 169 to be purchased. Some of the un-typical ammenities include a rock climbing wall, a bowling alley and a landscaped courtyard designed by Mathews Nielson. The building overlooks the Hudson river providing residence with a breath-taking view.
Orion, 350 West 42nd Street, New York City
Orion is a 60 story glass building located just blocks away from Time Square. Thought was put into the views of each residential unit. Even on the lowest floor, the inhabitants desire for a view of the Hudson river are not obstructed because the surrounding buildings will not grow any higher. There are 333 different floor plans adding up to 550 units being either studios, one, two or three bedroom units.
Lucida, 151 East 85th Street, New York City, NY
Lucida was the first LEED certified residential building in Manhattans Upper East Side. This is a mixed use building that has several retail services on the first two levels. The residential units range from two to five bedrooms. 70% of the units were sold within the first months of offering. The units feature floor to ceiling windows, 10 foot ceilings, oak flooring and high-end fixtures and appliances.
212 East 47th Street, 212 East 47th Street, New York City, NY
212 East 47th Street was converted into a condominium in 2008. Its neighborhood is quiet and mostly residential. There are 261 residential units, from one to three bedrooms. Some units feature balconies, terraces, and/or fireplaces. During the construction, buyers cold pick from three finishing plans. Amenities include a fitness center, yoga studio, library, a catering kitchen and many more.
Avery, 100 Riverside Boulevard, New York City
Avery was born from Extell Development partnering up with the Carlyle group to buy out Donald Trump. The building is 32 stories that encompasses 274 apartments from 600 square foot studios to 1700 foot three bedroom units. There are many amenities and services in this building, including a 24 hour library, a performance theater, a yoga studio and exclusive access to performances at Lincoln Center.
- Extell Development Company
- Wikipedia - Extell Development Company
- Inside View - Extell Development Company
- The Real Deal - Barnett'd big buildout