CORRECTED-New Freedom Tower design unveiled

Corrects date tower will be finished in seventh paragraph
to 2011, corrects height to 1,368 feet in 11th paragraph.

By Mark Egan and Joan Gralla

NEW YORK (Reuters) – The redesigned Freedom Tower at Ground
Zero in Lower Manhattan, planned to become America’s tallest
building, will be a monolithic glass structure reflecting the
sky and topped by a sculpted antenna, the architects said on
Wednesday.

Symbolic of the Declaration of Independence, the reworked
1,776-foot (541-meter) centerpiece of the World Trade Center
site unveiled by architect David Childs will have a base
sheathed with rolled, heat-treated glass over concrete.

The tower is planned as a symbol of New York’s
revitalization after the September 11 attacks in 2001, which
claimed more than 2,700 lives at the World Trade Center.

Rebuilding has been dogged by almost five years of acrimony
over designs, security, insurance and control of the 16-acre
(6.5-hectare) site at Ground Zero.

The new design uses a high-tech laminated safety glass,
which if attacked by a truck bomb would shatter into falling
pebbles, not break into flying shards.

The previous design featured a 200-foot (61-meter) metal
and concrete base, added after New York police said the
building would be vulnerable to truck bombing. The design was
also criticized for looking too bunker-like.

The new plan for the building — construction began in
April and is hoped to be completed by 2011 — was made after
consulting New York police counterterrorism experts as well as
state and city officials.

The exterior glass to be used is rolled with molten metal
and the design features a vertical triangular rib motif, echoed
throughout the building and on the antenna.

The tower will be surrounded by groups of steps leading to
the entrance, serving as a public plaza and security buffer
zone. A series of thigh-high rectangular slabs on the site’s
perimeter — resembling tombstones in an artist’s rendering —
will guard against truck bombs.

The antenna, to be used by radio and television
broadcasters, has been given a more sculptural feel by Kenneth
Snelson, a sculptor best-known for his Needle Tower, installed
in New York’s Bryant Park in 1968.

The antenna raises the building from 1,368 feet (410
meters) — the height of the original World Trade Center’s
110-story twin towers — to the full 1,776 feet.

Unlike most other glass-clad office buildings, the Freedom
Tower will appear clear because they will remove the iron,
which tints glass green, Kenneth Lewis of architects Skidmore,
Owings & Merrill told reporters at a preview.

“We’ve tried to make it more monolithic,” he said. “It’s
reflecting the sky and the changing light’s character as the
day goes on.”

The architects have drastically rethought Daniel
Libeskind’s original twisting design for the Freedom Tower
because it would have been too hard to build and too vulnerable
to attack.