HRS Construction also had to deal with the logistics of undertaking the construction work on Colombo Street, one of the busiest in the city.
This required operating outside normal office hours and utilising various access systems.
"And this project has history, too," says Marshall. "Hughes Rees Sara Construction, the previous generation of HRS, had built the building around 1990. And the good bones of the original building had performed well in the earthquakes.
"It was really great to be able to recycle a large, useful building rather than demolish it."
With a total rejuvenation and refurbishment of a building comes opportunity to begin afresh, particularly in terms of the interior design. For engineering consultancy Powell Fenwick, this involved reworking its floors to better reflect the firm and to improve internal connections and staff comfort.
Gaze Property Solutions undertook the re-fit, says Gaze national creative director Siavash Momeny.
"Powell Fenwick's brief was to create a relaxed and professional space, with added wow factor in parts of the layout. The reworked floors needed to let clients know at a glance that they have entered an engineering consultancy firm," Momeny says.
"Workspaces had to be productive and healthy, with the directors' offices designed so that they still felt part of their team and didn't appear exclusive.
A mix of breakout space and collaboration spaces was also required and the premises had to have a strong visual connection between floors.
In response, Gaze introduced similar feature finishes and product throughout the tenancy, such as light woodgrain laminate, natural wood, and the design of the carpet inlay on both levels. The designers planned floors to have an intuitive sense of direction.
"The floors are laid out similarly, apart from areas with specific functions, such as the new glass meeting rooms and reception on level four. So there's a sense of relationship and connectivity as you walk around," says Momeny.