From wikipedia:

Owners and tenants

One World Trade Center is owned principally by the Port Authority of New York and New Jersey.
Around 5% equity of the building was sold to the Durst Organization in
exchange for an investment of at least US$100 million. The Durst
Organization assisted in supervising the building's construction, and
manages the building for the Port Authority, having responsibility for
leasing, property management and tenant installations.^[60][61]

Government tenants

In 2006, the State of New York agreed to a 15-year lease of 415,000 square feet (38,600 m²) of space inside 1 WTC, with an option to extend the term of the lease and occupy up to 1,000,000 square feet (90,000 m²).^[62] The General Services Administration (GSA) initially agreed to lease approximately 645,000 square feet (59,900 m²) of space,^[52][62] and New York State's Office of General Services (OGS) planned to lease approximately 412,000 square feet (38,300 m²)
of space. However, in July 2011, the GSA ceded most of its leased floor
space to the Port Authority, and the OGS withdrew from the lease
agreement.^[63] In April 2008, the Port Authority announced that it was seeking a bidder to operate an 18,000 sq ft (1,700 m²) observation deck on the tower's 102nd floor.^[64]

China Center

The building's first lease was announced on March 28, 2009, as a joint project between the Port Authority of New York and New Jersey and Beijing-based Vantone Industrial Co. A 190,810 sq ft (17,727 m²)
"China Center", combining business and cultural facilities, is to be
located between floors 64 and 69, to represent Chinese business and
cultural links to the United States, and to serve American companies
that wish to conduct business in China. Vantone Industrial's lease is
for 20 years and 9 months.^[65]
In April 2011, a new interior design for the China Center was unveiled,
featuring a vertical "Folding Garden" based on an initial proposal by
the Chinese artist Zhou Wei.^[66]

Condé Nast

On August 3, 2010, publisher Condé Nast
signed a tentative agreement to move the headquarters and offices of
its magazines into One World Trade Center, occupying up to 1,000,000
square feet (90,000 m²) of the building.^[67]
On May 17, 2011, Condé Nast reached an agreement with the Port
Authority, securing a 25-year lease with an estimated value of
$2 billion.^[68] On May 25, 2011, Condé Nast finalized the lease agreement, leasing 1,008,012 square feet (93,647.4 m²) of office space on floors 20–41 of the tower. The lease also covers 30,000 square feet (2,800 m²)
of usable space in the podium and below grade floors, for mail,
messenger services, and storage use. On January 17, 2012, it was
reported that Condé Nast would be leasing an additional 133,000 square
feet (10,000 m²) of space, occupying floors 42–44 of the tower.^[69]

Proposed tenants

On January 27, 2012, it was announced that Chadbourne & Parke, a Midtown Manhattan law firm, would be signing a lease to around 300,000 square feet (30,000 m²) of space in One World Trade Center.^[70] However, negotiations broke down and the deal collapsed abruptly in March 2012.^[71]

Key figures

Larry Silverstein

Larry Silverstein
of Silverstein Properties, the leaseholder and developer of the
complex, retains control of the surrounding buildings, while the Port
Authority has full control of the tower itself. Silverstein signed a
99-year lease for the World Trade Center site in July 2001, and remains
actively involved in most aspects of the site's redevelopment process.^[72]

David Childs

David Childs,
one of Silverstein's favorite architects, joined the project at the
urging of Silverstein and developed a proposal for 1 WTC, initially in
collaboration with Daniel Libeskind. The tower's design was revised by
Childs in May 2005 to address security concerns. He is the project
architect of the tower, and is responsible for overseeing its day-to-day
design development from inception to completion.^[73]

Daniel Libeskind

Architect Daniel Libeskind
won the invitational competition to develop a plan for the World Trade
Center's redevelopment in 2002. He included an initial proposal, 'Memory
Foundations', for the design of 1 WTC, a building with aerial gardens
and windmills with an off-center spire. Libeskind later denied a request
to place the tower in a more rentable location next to the PATH station
and instead placed it a block west, because in profile it would line up
with, and resemble, the Statue of Liberty.^[74] Most of Libeskind's designs were later scrapped, and other architects were chosen to construct the other WTC buildings.^[75]
Nonetheless, one element of Libeskind's initial plan was reflected in
the final design – the tower's symbolic height of 1,776 feet (541 m).^[76]

Dan Tishman

Dan Tishman, along with his father John Tishman, builder of the
original World Trade Center, is leading the construction management
effort for Tishman Realty & Construction, the selected builder for 1 WTC.^[77]

Douglas and Jody Durst

Douglas and Jody Durst, the co-presidents of the Durst Organization, a
real estate development company, won the right to invest at least
$100 million in the project on July 7, 2010. The Durst Organisation is a
family-owned company that specializes in the development, managing,
leasing, and operation of sustainable commercial construction space.^[78][79][80] Condé Nast, a long-time Durst tenant, also confirmed a tentative deal to move into 1 World Trade Center in August 2010,^[79][80][81] and finalized the deal on May 26, 2011.^[82]

Port Authority construction workers

A WoodSearch Films short-subject documentary was uploaded to YouTube on August 31, 2010, entitled How does it feel to work on One World Trade Center?.
Nearly all of the construction workers interviewed praised the unity
and work ethic of the new World Trade Center's construction team. Others
spoke of the importance they believed the construction of the tower had
to the people of the United States. A deputy foreman, George Collins,
said, "All the men are working in conjunction to put this building up.
They all know how important this is to the country – and to show the
world what us Americans can do – and get this done, union and proud."
Another deputy foreman, Scott Williams, commented, "[The] camaraderie of
the crew is very good."^[83]

Robert Durst

Robert Alan "Bobby" Durst (born 1943) is a son of the late New York real estate mogul Seymour Durst, and brother of commercial developer Douglas Durst.

Early life

Durst grew up, one of four children, in Scarsdale, New York and attended Scarsdale High School. He completed his undergraduate degree at Lehigh University and attended graduate school at UCLA.
Durst reportedly witnessed his mother's apparent suicide at age seven;
she either fell or jumped off the roof of the Scarsdale family mansion.
According to Reader's Digest,
Durst underwent extensive counseling because of his mother's death, and
doctors found that his "deep anger" could lead to psychological
problems, including schizophrenia.
Durst went on to become a real estate developer in his father's
business; however, it was his brother Douglas who was later appointed to
run the family business. The appointment in the 1990s caused a rift
between Robert and his family, and he became estranged. His earlier
schizophrenia diagnosis was incorrect.^[1]

Fugitive

In 1973, Durst married Kathleen McCormack, who disappeared in 1982.
Her case remained unsolved for eighteen years when New York State Police
reopened the criminal investigation. On December 24, 2000, Durst's
long-time friend, Susan Berman, who was believed to have knowledge of McCormack's disappearance, was found murdered execution-style in her Benedict Canyon California house. Durst was questioned in both cases but not charged.^[1][2]

According to prosecutors, he moved to Texas in 2000 and began
cross-dressing to divert attention from the disappearance of McCormack.^[3]

In 2001, Durst was arrested in Galveston, Texas, shortly after body parts of his senior neighbor, Morris Black, were found floating in Galveston Bay,
but he was released on bail. Durst missed his court hearing and was
declared the nation's first billion-dollar fugitive. He was caught in Bethlehem, Pennsylvania, at a Wegmans Supermarket,
after trying to steal a chicken sandwich and a Band-Aid, even though he
had $500 cash in his pocket. A police search of his rented car yielded
$37,000 in cash, two guns, marijuana, and Black's driver's license.^[4]

These events inspired the 2010 film All Good Things, the title of which is a reference to a health store of the same name set up by Durst and his wife in the 1970s.^[5][6]

Trial

In 2003, Durst went on trial for the murder of Morris Black. He hired defense attorney Dick DeGuerin
and claimed self-defense. During cross-examination, Durst admitted to
using a paring knife, two saws and an axe to dismember Black's body
before dumping his remains in Galveston Bay.^[7] The jury acquitted him of murder.^[8]

In 2004, Durst pleaded guilty to two counts of bond jumping and one
count of evidence tampering. As part of a plea bargain, he received a
sentence of five years and was given credit for time served, requiring
him to serve about three years in prison. ^[9]

Durst was paroled in 2005. The rules of his release required him to stay near his home; permission was required to travel.

Second arrest

In December 2005, Durst made an unauthorized trip to the boarding
house where he had killed Black and to a nearby shopping mall. At the
mall, he ran into the presiding judge from his murder trial, Judge Susan
Criss. Due to this incident, the Texas Board of Pardons and Paroles determined that Durst had violated the terms of his parole, and he was returned to jail.^[10] He was released again from custody on March 1, 2006.^[11]

From the New York Times:

Seymour B. Durst, Real-Estate Developer Who Led Growth on West Side, Dies at 81
By ALAN S. OSER
Published: May 20, 1995

Seymour
B. Durst, a Manhattan real-estate investor and developer who combined a
passion for city history with an equally strong distaste for government
involvement in land-use affairs, died yesterday at New York Hospital.
He was 81.

Mr. Durst had a stroke on May 12 and did not regain consciousness, said his son Douglas.

First
as a member and later as president of the family real-estate firm, the
Durst Organization, Mr. Durst became perhaps the leading assembler of
the parcels of land on which office buildings were developed in east and
west midtown over the last 40 years. "I've spent most of my life buying
buildings and canceling leases and negotiating to get tenants out," he
once said in an interview.

As developers, Mr. Durst and his
brothers in the Durst Organization built first on the East Side and then
on or near the Avenue of the Americas in the West 40's, on sites
assembled by Seymour Durst. The West Side buildings were the fulfillment
of his expectation 25 years ago that Manhattan growth would move to
west midtown from east midtown, where his father, Joseph, was active
before him.

Joseph
Durst, a garment manufacturer who arrived from Austria in 1902, founded
the business in 1927. During the Depression, he bought mortgages and
leases on East Side commercial buildings. Seymour joined the firm in
1940 and took the title president after his father died in 1974.

The
Dursts developed five office buildings on Third Avenue in the East 40's
during the 1950's and 60's. Four of them -- all known by their
addresses, Nos. 655, 675, 733 and 825 Third Avenue -- are still owned by
the Dursts.

While the Third Avenue development was proceeding,
Seymour Durst began buying property in west midtown, especially between
Avenue of the Americas and Seventh Avenue and between 42d Street and
Rockefeller Center. In one period, about 1965 to 1975, he owned or held
options on about 10 acres of midtown land.

On the sites that the
Durst Organization itself developed now stand 1133 Avenue of the
Americas, on the west blockfront from 43d to 44th Street, 1155 Avenue of
the Americas, on the west blockfront from 44th to 45th Street, and 114
West 47th Street. They are part of a portfolio of 4.5 million square
feet of office buildings owned by the Dursts. In addition, the firm's
holdings include 60 residential buildings with 500 apartments and an
assortment of commercial buildings, nearly all on land that the Dursts
view as potential redevelopment sites.

Fifteen midtown sites that
Seymour Durst assembled were redeveloped by other builders. When Mr.
Durst decided to hold an assemblage but had no quick prospect of finding
a tenant for a new building, he would sometimes clear the site and
build small stores -- he called them "taxpayers" -- to produce quick
revenue until the market turned up.

Unlike most developers, Mr.
Durst gave public voice to his views on governmental affairs and found
varied and even quirky ways to do so. Appalled by the growth in the
national debt, for example, he established a "national debt clock" on
one of his taxpayers on the Avenue of the Americas near 43d Street. It
electronically reports an estimated second-by-second growth of the
national debt, and each American household's average share of it.

He
tirelessly wrote articles and letters to the editor and took out pithy
newspaper advertisements criticizing or poking fun at governmental
intervention in the real-estate market. In the 1980's, he tried in court
to block the New York State Urban Development Corporation from taking
any land for the Times Square redevelopment project, now under way.

In
particular, Mr. Durst decried the drastic decline in private housing
development in New York City over the last 20 years, which he ascribed
primarily to irrational zoning regulations. He considered it absurd, for
example, that New York keeps so much land in Manhattan zoned for
manufacturing when there is little likelihood it can ever be developed
for that use.

In 1984, he collaborated with Andrew Alpern, an
architect, on a book called "Holdouts!" (McGraw-Hill), detailing
celebrated cases in which stubborn property owners thwarted
developments. The accounts of how P. J. Clarke's, the saloon, was left
standing when 919 Third Avenue was built at 55th Street in 1984, and how
a Chock Full o' Nuts coffee shop tied up development from 1967 to 1980
at 135 Broadway, are retold in piquant detail.

Mr. Durst's
interests ranged further. In the early 1970's, he and Irving Kahn, a
financier, founded the New York City Job and Career Center, teaching job
skills to thousands of high school students.

In semiretirement,
he devoted himself to his passion for New York City history, expressed
in a collection of 10,000 books, maps, prints, signs and other items
that evolved as the Old York Library. It takes up most of the five-story
town house on East 61st Street where he lived in recent years.

He
also had a principle in real-estate investment: don't buy anything you
cannot walk to. The walk to 10th Avenue and 42d Street may have been a
little farther than usual, but it took him to one of his most notable
assemblages -- 82 parcels on the block between 42d and 43d Streets, from
Ninth to 10th avenues -- put together over 25 years. He sold them in
1974 to HRH Construction Company, which built a large middle-income
residential project, Manhattan Plaza.

Another assemblage, still
owned by the Dursts, is the land on the west side of Avenue of the
Americas from 42d to 43d streets. In typical patient Durst fashion, he
chose to build retail stores as an income-producing holding action.

Mr.
Durst, who is remembered by colleagues for his courtly manners even in
difficult negotiations, insisted on paying only what he considered
reasonable prices for land and holding it until natural market growth
caught up, rather than paying top price for land that nearby development
had already made more valuable.

But during the slow-growth
1970's, those natural forces often brought pornographers as subtenants
in his older buildings in the West 40's. The administration of former
Mayor Abraham D. Beame attacked him as a coddler of pornographers.

"We
closed 100 pornography shops," Mr. Durst said then. But to demonstrate
how difficult the eviction procedure could be in court, he sold one
building to a woman who was already operating a notorious massage parlor
in it. "Let the city evict her, since they weren't helping us to do
it," he said.

In the end, she defaulted on a large second mortgage
from the Dursts. They recovered the building and demolished it as part
of the site for a building for the United States Trust Company of New
York, at 114 West 47th Street.

Mr. Durst was born in Washington
Heights. He graduated from the Horace Mann School in Riverdale, the
Bronx, in 1931 and the University of Southern California, where he
majored in accounting, in 1935. In 1940, he married Bernice Herstein,
who died in 1950 at age 32. He never remarried.

Besides Douglas,
of Manhattan, Mr. Durst is survived by two other sons, Robert, of
Manhattan, and Thomas G., of Ross, Calif.; a daughter, Mrs. Wendy Durst
Kreeger of Larchmont, N.Y.; a sister, Alma Durst Askin of Manhattan; a
brother, David M., of Chappaqua, N.Y., and eight grandchildren.