HELL IN HALL FOR STAFF

Columbia janitor: Riot fiends had maps & zip ties

Columbia University janitors were gripped with “sheer terror” as a mob of violent anti-Israel protesters stormed Hamilton Hall and took over the building on April 30 — armed with hand-drawn floor plans and supply lists, says a longtime custodian for the Ivy League school.

As dozens of rioters busted through glass and barricaded the entrances to occupy the historic university building, four janitors found themselves trapped inside and afraid, Henry Clemente, a head custodian for Columbia, told The Post.

“If you have masked people running through the building with zip ties and chains, you don’t know what they’re going to do — if they’re going to take you hostage, if you’re going to be tortured, if you’re going to be made an example,” he said.

Plotted takeover

Afterward, as Clemente and his colleagues started to clean up the hall after NYPD cops busted up the occupation, he discovered secret plans left behind by the highly organized rioters.

These included handdrawn floor plans and supply lists noting locations of barricading equipment; a “task list” with items including setting up a pulley system and “security shifts” and even a schedule listing the times of the Muslim call to prayer.

The documents show that the protesters had insider knowledge of the campus and plotted the takeover in advance, Clemente said.

“I’ve been working there a long time, so we know where the tunnels are, but they mapped everything out,” said Clemente, who has worked at Columbia for 17 years.

“They had a food room, a prayer room, the smoking room . . . they were in there for the long haul.”

The left-behind docu

ments were first reported by Gothamist.

The facilities boss, who was off-duty at the time, received a call that his workers had been stuck inside the building.

“Even if it’s two minutes, two minutes could feel like an eternity just faced with the massive numbers [of protesters]” charging into the building,” he said.

“I could imagine the sheer terror that they had gone through,” he added.

Clemente said the day the police went into Haad

milton Hall was “the most fearful day” of the weekslong protests at the school, but understood the need to get the demonstrators out of the building fast, particularly in today’s “post-9/11 world.”

‘Russia & China’

“We have a lot of enemies in the world, like Russia and China,” he said. “There’s proxy wars and different things going on, so we don’t know who was in the building.”

Mayor Adams and NYPD officials have said outside agitators were behind planning the university protests.

Of the roughly 44 arrested inside Hamilton Hall, 13 were not affiliated with Columbia.

Since NYPD cops stormed the building and arrested the protesters, Clemente has been in charge of cleaning up the mess left behind by the privileged rioters, one of whom is allegedly the 40year-old son of wealthy

execs who lives in a $3.4 million Brooklyn townhouse.

The protesters managed to disable the elevator and threw hundreds of chairs from the classrooms down the stairs before zip-tying them together.

They also removed tabletops from desks and drilled them into windows as barricades.

Clemente estimates that it will cost the university millions to fully repair Hamilton Hall.