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Weeks of windy, wet weather have slowed work on AMP NZ Office Trust's redevelopment of its large office tower at the foot of Queen St in Auckland.
Rob Lang, ANZO chief executive, said the job was running two months behind.
Instead of the building being ready by next July, it would not now be finished until September, he said.
He blamed poor weather but said all other aspects of the big job were going well.
A tower crane on the side of 21 Queen St has been forced to stop hauling heavy materials into the building when the winds reach certain speeds. Lang said gutting the building and installing the double-glazed curtain wall panels on its exterior required relatively settled weather for Fletcher Construction.
About half the stripped building is now glazed.
The $80 million job to refurbish and extend the building to become a 17-level structure is the city's largest makeover and has seen ANZO add upper levels to what was once called Downtown House.
By the time work is finished, the trust will have spent $112 million on the tower: purchase costs and upgrading it.
It is expecting a 13 per cent internal rate of return on the 14,700sq m block, which is likely to qualify for a five-star green building rating.
The block's transparent skin is a high-performance, low-energy glass to filter solar energy so tenants can get the best natural daylight and views from the full-height glazing with minimal heat gain.
ANZO is expecting low electricity demands from tenants in the tower, due to the full-height glass and 360-degree natural lighting.
Lower lighting demand will in turn mean less demand for cooling the tower in summer and the trust has estimated the CO2 emission reduction from the tower will be the equivalent of taking 300 cars off the road.
Lang said Fletchers had now finished removing most of a lower-level floor to create the new double-height internal foyer.
This entrance area off QEII Square will be similar to the PricewaterhouseCoopers Tower entrance, with escalators rising from the ground level to the main entry foyer on level one.
New floors at the top of the tower are up and ANZO is having leasing discussions with a number of parties, expecting to get about $500 a square metre for the space.
About 90 people could work on each floor of the tower although Lang said this would be maximum capacity and most tenants would have lower occupancy level requirements.
The job is the only Auckland development on for the trust, which has its headquarters in Wellington.
ANZO has $1.6 billion in property assets and is New Zealand's largest office landlord.
