Wellington's landmark St Gerard's Church will close its doors later next month, after the owners failed to raise enough money to get the earthquake-prone building strengthened.
The church and neighbouring monastery - both Category One heritage-listed buildings - were deemed earthquake-prone after the Christchurch earthquakes.
The estimated cost to get the buildings up to standard is $10 million.
"The reality of a large building that needs serious earthquake strengthening has led the ICPE Mission to rethink our long-term presence in Wellington and look at new ways of being Christ's presence in the city," ICPE Mission director Silvana Abela said.
The final service will be held on the Christian holiday of Pentecost in late May.
The Catholic Archbishop of Wellington, Cardinal John Dew, will celebrate the final Mass.
What makes the building so significant?
The church is noted by Heritage New Zealand as "one of Wellington's most significant and well-known landmarks" because of its "spectacular location" and "combination with the large and impressive monastery".
In the mid-20th century, the church was nationally renowned for its choir, with services broadcast on National Radio for 37 years.
It also holds international spiritual significance, as the "first church in the world to be dedicated to St Gerard Majella".
It also has architectural significance "as an example of the work of well-known local architect John Sydney Swan".
Historic Places Wellington chairwoman Felicity Wong said the building's closure should act as "a real wake-up call for Wellingtonians".
"We need to pitch in and try and figure out how we can help the owners raise the money to have those buildings strengthened.
"It's a placemaking building, it's a building we all know and love, it's a building we're all familiar with."
"It needs all of the city to get behind raising the money, to apply for the lotteries, apply to the Government through the Equip Fund, through the Ministry of Culture and Heritage.
"And we all have a responsibility to help ensure that building remains an iconic part of our landscape."