Here are some useful resources for body corps from apm.

Unit Titles Act 2010

The unabridged full version of the official Unit Titles Act 2010.  An Act created to facilitate the subdivision of land into units that are to be owned by individual proprietors, and common property that is to be owned by all the unit proprietors as tenants in common, and to provide for the use and management of the units and common property.

http://www.legislation.govt.nz/act/public/2010/0022/latest/DLM1160440.html

Unit Titles Regulations 2011

The unabridged full version of the supporting regulations for the Unit Titles Act 2010.

http://www.legislation.govt.nz/regulation/public/2011/0122/latest/DLM3695701.html

Weathertight Homes Resolution Services Act 2006

Leaking Building information and a guide to available services.

http://www.legislation.govt.nz/act/public/2006/0084/latest/DLM403530.html

https://www.building.govt.nz/resolving-problems/resolution-options/weathertight-services