5 offices available
100 King William Street
From $1,620 /mo
2–15+ people
People
2–20
Available
6 suites
From
$1,400/mo
Availability
Listed 20 Feb 2026 — availability confirmed on enquiry SS-316Need space for a larger team?
20+ people
Why this building
Premium Serviced Offices
Premium workspace in Adelaide.
Flexible Terms For Growth
Offices for teams of 2 to 20 people with flexible terms.
Prime City Locations
6 offices available – contact Sidespace to arrange an inspection.
The building
Stay close to your most important clients with a workspace in the heart of the action. Our attractive 121 King William Street offices are ideal for businesses looking to base themselves in Adelaide's prestigious legal and financial district.
When you need a breather, take a visit to nearby Rundle Mall, a pedestrianised retail hub filled with a wide selection of stores. And explore the city's many after-work entertainment options, with pubs, bars and live music in plentiful supply.
Read more
When you need a breather, take a visit to nearby Rundle Mall, a pedestrianised retail hub filled with a wide selection of stores. And explore the city's many after-work entertainment options, with pubs, bars and live music in plentiful supply.
Key facts
| Product | Serviced offices |
| Operator | Regus |
| Address | 121 King William Street, Adelaide SA 5000 |
| Offices available | 6 |
| Team sizes | 2–20 |
| From | $1,400 /mo all-inclusive |
| Monthly range | $1,400 – $14,000 |
| Terms | Flexible · all-inclusive |
| Reference | SS-316 · listed 20 Feb 2026 |
Location
Connecting streets
Streets intersecting or near King William Street
Grenfell Street
Currie Street
Rundle Street
Pirie Street
Flinders Street
Waymouth Street
Franklin Street
Hindley Street
North Terrace
Transport & access
Nearest transport options from this property
Adelaide Station
Train station
200m
King William Street Tram
Tram / Light rail
100m
Grenfell Street Bus Stops
Major bus stop
150m
Currie Street Bus Stops
Major bus stop
200m
The operator
About Regus
View all Regus locations ›
Regus is a managed workspace operator with office space available at 121 King William Street, Adelaide. Contact Sidespace to learn more about their portfolio.
More offices for lease nearby
5 offices available
Frequently asked questions
How much is office space at 121 King William Street, Adelaide?
$1,400 to $14,000 a month covers a private office at 121 King William Street, all-inclusive, across 6 available suites. Rates at this centre are indicative — we confirm exact pricing on enquiry.
What does that work out to per desk at 121 King William Street?
$700 per desk per month, based on the 6 priced suites listed at 121 King William Street and the headcount each is sized for. Rates at this centre are indicative — we confirm exact pricing on enquiry.
What size offices are available at 121 King William Street?
6 private offices are listed at 121 King William Street, suiting 2 to 20 people.
How do you get to 121 King William Street?
200m from Adelaide Station, and 100m from King William Street Tram. It sits between Grenfell Street and Currie Street.
Who operates 121 King William Street?
Regus operates the 6 serviced offices listed at 121 King William Street.
