ERA
is inspired by the idea of creating a loose fit, sustainable working and
shopping environment that was light, sunny and breezy to increase a sense of
well-being for its occupants and visitors – a breathing environment rather than
sealed container. The offices have access to a communal courtyard – a green
space for relaxation, reading and conversation. The building is finely
integrated with the adjoining public domain.
The main design challenge was how to
achieve conditions for passive design performance on a constrained infill site
for small offices: specifically favourable orientation on an east-west facing
site, cross flow ventilation for offices and natural light into the common
circulation areas on a deep site.
ERA
comprises two slim-line buildings running east-west, split by a through-site,
public pedestrian way that steps up from Springfield Avenue to Llankelly Place,
a rear pedestrian lane that feeds onto Macleay Street, Potts Point, a
night-time entertainment street packed with bars, restaurants and hotels.
The
main climatic innovation is the central breezeway with gallery walkways for
pedestrian access to the offices at each level which is located above the
through site public way. The breezeway, based on the design of Sydney arcades,
is an essential element of the passive design of the building. The breezeway is
a tempered semi-external space, which provides a sink of continually
replenished cool air for cooling the offices at each level. The flow of cool
air is induced into the offices through grills in the bulkheads over the
galleries and ventilation louvres in the bulkhead above the glazed entry doors.
The
breezeway is covered by a unique stepped and louvred glass roof whose shape is
profiled to maintain air flow and protection from rain. The glazed roof profile allows the flow of
cool, north-east breezes in summer from Elizabeth Bay and protection from
rain-driven, southerly wind in winter. The breezeway also provides a filtered
source of soft, glare-free, secondary light into the office modules through the
glazed entry doors.
The
office floor plan is typically based on a module of 60sqm plus 20sqm loggia.
The typical office consists of an open plan work area extending onto the
loggia; a service pod, fitted with kitchen, bathroom, communications dock, data
hub, and space for recycling bin. The service pod is contained within a silver
metallic clad box, adjacent to the entry. Office modules can be amalgamated to
make a complete floor of 350sqm. The
office component has achieved a simulated 4.5 star ABGR rating (5 star NABERS)
based on a C02 emission of 90kg/sqm per annum, modeled by Cundall.
The
building is expressed as two elevated cubic forms, floating above a dark
coloured street base. The breezeway, which cuts through the full width of the
site, is screened from the adjacent street, lane and public pedestrian way by
fixed aluminium screens which appear as metallic veils that create a private
capsule for the office interaction.