Oshawa's Premier
Shared Office Community
and Business Centre

From shared office space to private offices to meeting rooms, large and small, CORE21 provides all the business amenities you need plus an intangible - a collaborative, friendly atmosphere from a growing community of more than 45 businesses and community groups making us their home.

Come in and find out what makes us special.

Core 21 Facade

Oshawa's premier shared office community and business centre

21 Simcoe Street South in the heart of downtown Oshawa is home to CORE21. This beautiful two-storey, fully renovated building was specifically designed to provide a shared business facility in a friendly community setting. Book a tour today and find out how we can satisfy all of your needs from mail service to private offices to meeting rooms to event rooms, and everything in between!

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Coworking Spaces

We offer a wide variety of cheerful, energizing workspace options that encourage productivity, interaction, and community.

core21private office

Private Offices

Need something a little more private and quiet? Then a private office may be a perfect fit for you. We supply the desk and the space, you supply the business genius.

reception area

Business Address & Mail Service

Don't need office space but need a business address? We have you covered there too. We can accept your mail at our reception and notify you of its arrival.

CORE21 Boardroom

Meeting Rooms

CORE21 offers its clients a variety of meeting rooms, perfect for client meetings, interviews, board and staff meetings, conference calls, as well as brainstorming sessions and workshops.


Dedicated Desk Rental

Dedicated use of a 6' executive high end desk with lockable storage cabinet located in the communal working space area on our main floor.

Event Room pic

Event Room

The Event room at CORE21 is available to rent at an affordable rate to host gatherings of a larger scale such as presentations and seminars, educational classes, networking events and more.

Main Floor

Lounge & Amenities

No matter which space you rent, CORE21 provides excellent amenities. We have the business equipment you need plus lounge areas throughout the space where you can interact and catch up with colleagues, friends, and your guests.  There is also the Servery and more.


CORE21 is located in the heart of downtown Oshawa and is proud to be home to 45 local business and community organizations.