Under cover of darkness, a huge crane works away at the former Conservation House, on the corner of Cumberland and Lower Stuart Sts, in central Dunedin.
The top three floors of the four-storey building are being developed into a 19-unit boutique hotel.
The building, built in 1910, is category 2 listed and is on the council's heritage schedule. It was originally the premises of engineering company John Chambers & Son.
The crane was used to remove building materials from the roof area about 8pm.
A foreman working on the site said he could not comment on the nature of the work. Cycle World Dunedin is situated on the ground floor of the building.