The Christchurch Earthquake Appeal Trust is to give $14 million towards the rebuilding of the Arts Centre's historic clock tower and great hall.
The appeal's trustee, Rod Carr, says the announcement on Monday ensures the future of one of Christchurch's most iconic buildings.
The clock tower was built in 1877 and the hall opened in 1882.
The rebuild is expected to cost about $35 million, with funds also coming from insurance and donations by Fletcher Building ($4 million), the Aotearoa Foundation ($5 million) and the Canterbury Earthquake Heritage Building Fund ($5 million).
It will take nearly three years to complete.
The cost of the 15-year project to rebuild and refurbish the entire Arts Centre is expected to be more than $200 million.