5 offices available
Cubes.Co
100 King William Street
From $1,620 /mo
2–15+ people
People
2–20
Available
6 suites
From
$1,400/mo
Availability
SS-316 · verified 20 Feb 2026
2 people
$1,400/mo
4 people
$2,800/mo
6 people
$4,200/mo
8 people
$5,600/mo
10 people
$7,000/mo
20 people
$14,000/mo
Need space for a larger team?
20+ people
Why this building
Premium Serviced Offices
Premium workspace in Adelaide, available now.
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 · verified 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 does it cost to rent office space at 121 King William Street?
Serviced offices at 121 King William Street range from $1,400 to $14,000/month, all-inclusive. Contact Sidespace for a quote tailored to your team.
How many people can 121 King William Street accommodate?
Offices here suit from 2 to 20 people. Larger teams can be arranged through combined suites and full floors — just ask Sidespace.
Who operates 121 King William Street?
121 King William Street is a serviced/flexible workspace operated by Regus. Enquire through Sidespace to arrange an inspection or a tailored proposal.
Where is 121 King William Street located?
121 King William Street, Adelaide is in Adelaide, SA. The building is known as 121 King William Street.
Are offices available at 121 King William Street now?
Yes — 6 offices are currently available at 121 King William Street. Contact Sidespace to arrange an inspection.
