The Bronx private school seeks $52 million in tax-free bonds to build a "natatorium," theater and gym.
Students received an email Monday night telling them about the hike. By Wednesday the plan was dead.
The college's freshman class, the first in decades to pay tuition, said the school is still a good deal.
Members of the Committee to Save Cooper Union rallied after commencement on Wednesday.
Linden Tree Preschool was closed earlier this year by Christ Church Schools.
Ending more than 100 years of tradition, Cooper Union will begin charging undergraduate tuition in 2014.
The school's Board of Trustees may consider charging tuition in future years.
Students have accused the cash-strapped university of delaying early admissions decisions.
Eleven students from the school have locked themselves in the school's Cooper Square building.
The St. Mark's Bookshop celebrated a rent reduction and clearance of debt on Thursday night.
Classes at Baruch College after 3 p.m. Monday were also postponed ahead of a meeting of CUNY's Trustees.
Students who were arrested at Baruch College said they were attacked by campus police.
Cooper Union students and alumni peppered school president Jamshed Bharucha with questions about a possible tuition charge at a meeting Wednesday night.
The Cooper Union in the East Village is considering charging students tuition for the first time to cope with a $16.5 million budget deficit.
The city could be on the hook for the cash after failing to place 2,500 special needs kindergarten kids in public schools.
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