The full extent of work needing to be done on Premier House is estimated to cost $30 million. \xa0
The building dates back to 1843 and has been the home of the Prime Minister since 1865.\xa0
Chief Executive of Heritage New Zealand Andrew Coleman says the building's age, along with the fact that it is a multi-functional property, suggests factors contributing to the maintenance cost may include security upgrades and water management.\xa0
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