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You may as well draw the terrorists a map.
Detailed schematics of several floors of 1 World Trade Center — a structure Police Commissioner Ray Kelly called the nation’s No. 1 terror target — were posted on the city’s Web site along with a mundane leasing document.
Stamped “Secure Document — Confidential — For Official Use Only,” the 17 detailed schematics can be downloaded right off the city’s Department of Finance Web site by anyone.
The Port Authority documents designate which areas of the floors can be leased out and which cannot. But they also show the locations of load-bearing walls, mechanical rooms, ventilation shafts, exits, elevators and stairs along with every nook and cranny.
They locate the ground-floor entrances — a major vulnerable point — and also where the PATH rail tunnels pass below.
The documents could be used to plan a Mumbai-style commando assault or determine a place to hide a bomb, experts warned.
“We should not be sharpening our own guillotines,” said Dr. Maria Haberfeld, chair of the Department of Law and Police Science at John Jay College who teaches counterterrorism to police agencies nationwide.
“Terrorists do train. They do countersurveillance, they look at targets and evaluate points of entry, points of evacuation,” she said after reviewing the floor plans.
But the PA said the documents were “scrubbed” of sensitive information about the building’s electrical systems, plumbing, security and fire safety.
“The Port Authority provided scrubbed drawings to our consultants. While their default template is marked ‘secure’ and ‘confidential,’ the pictures in that frame are not,” the agency said in a statement.
It blamed architectural consultant Beyer Blinder Belle for slapping the “confidential” stamp on the documents even though they are safe for public dissemination.
“These are leasing diagrams that are conceptual and spatial,” added a source familiar with the World Trade Center architecture plans. “They describe basic arrangement and location of space. They are typical for leases and contain no technical information.”
Still, this isn’t the first time the PA has accidentally exposed supposedly secret building plans for the World Trade Center site.
In 2008, The Post exclusively reported that a homeless man found in a Dumpster hundreds of pages of confidential schematics for what was then still called the Freedom Tower.
The PA then vowed to review its security procedures.
The documents were posted Monday, just as the PA was completing talks with the Condé Nast Publications to become an anchor tenant.
The $3 billion 1 World Trade Center, which dropped the Freedom Tower moniker in 2009, is scheduled to open in 2013 and will rise to a symbolic 1,776 feet tall.
