The Ministry of Civil Defence provides advice on preparing for emergencies at work here: http://goo.gl/5gPcZs.
As part of this, they explain the building owners’ obligations under the Fire Safety and Evacuation of Buildings Regulations 1992 (which can be accessed here: http://tinyurl.com/yh5jtda). The law requires tenants and employers to develop procedures (multi-risk preparedness – not just for fire) for the prevention of harm, as well as for identifying and managing hazards.
To help with this, WorkSafe NZ has a fact-sheet to help you assess whether you are prepared. See http://goo.gl/4JzckE. There is a series of templates to help with preparations here: http://goo.gl/yjj2YW.
The Civil Defence web pages also have a guide to the preparation of a civil defence cabinet, along with information on hazard assessment. See: http://goo.gl/meil5g.