Louis B. Stewart Observatory
An event space in Toronto, Ontario. This page collects the address, the access and the capacity figures an organizer needs before a site visit.
- Opened
- 1855
- 171 years old
- From YYZ
- 19 km (12 mi)
- Toronto Pearson International Airport
- From the centre
- 4.8 km (3 mi)
- of Toronto
Figures as published in open data, retrieved 3 September 2026. Capacities vary by layout — confirm the one you want with the venue.
About this venue
It stands at 12 Hart House Circle, M5S 3J9, 4.8 km (3 mi) from the centre of Toronto.
Louis B. Stewart Observatory was opened in 1855 and owned by University of Toronto, which puts it at 171 years old.
Neither a capacity nor a floor area is published for Louis B. Stewart Observatory in any open source, so the numbers on this page describe where it is and what it is, not how many it holds. The venue will quote you directly.
- Address
- 12 Hart House Circle, Toronto, ON
- Owner
- University of Toronto
- Coordinates
- 43.6632, -79.3946
- Classified as
- event space
Travel to Louis B. Stewart Observatory
Toronto Pearson International Airport (YYZ) is 19 km (12 mi) out, a standard transfer of twenty to forty minutes outside rush hour.
4.8 km (3 mi) out from the middle of Toronto — close enough to book a downtown hotel block, far enough that people will expect transport laid on after dark.
Toronto has 254 venues mapped in total and a population of 2,794,356. The Toronto guide covers the airport, the local time zone and what else is bookable nearby.
What fits in this room
Think of it as one room in a bigger plan: a training day, a members' evening, a committee that needs to be in the same place. It is 105th of 254 venues mapped in Toronto.
- networking mixers
An independent space with its own character, which a mixer benefits from more than a conference does.
- fundraisers and galas
A room with a personality is worth more at a gala than square footage is.
A worked example for Louis B. Stewart Observatory
Take 240 people through the door in Louis B. Stewart Observatory — a plausible programme at a venue of this kind in Toronto. The first 50 activated attendees are free on every event, so only the rest are billed, and the total stops moving at 1,000 however many more turn up.
- activated attendees
- 240activated attendees
- billable, after the first 50 are free
- 190billable, after the first 50 are free
- for the whole event, at CA$7 each
- CA$1,330for the whole event, at CA$7 each
You are billed for people, not for the room, so this figure does not change if you move the event down the road. event67 has no floor-plan or booking product — the venue handles the space, the app handles the people in it.
If this one is booked
4 other venues in Toronto have enough published detail for their own guide. Worth a shortlist before you commit.
- The Great Hallevent space
- Palais Royaleevent space
- Metropolitan United Churchevent space
- Concert Stageevent space
Where these numbers come from
event67 is not affiliated with, endorsed by or connected to this venue or its operator. This page is compiled from open data and links to the venue’s own website where one is published.
- Wikidata, CC0
- Venue data © OpenStreetMap contributors, available under the Open Database License.
- Geographic data © GeoNames, licensed under CC BY 4.0.
- Retrieved 3 September 2026. 7 distinct facts from the record are rendered on this page: street address, postal code, year opened, owner, encyclopaedia entry, nearest airport with distance, photograph on Wikimedia Commons.
Last updated
What it costs
- Free up to 50
- activated attendees, on one live event
- CA$7
- per activated attendee beyond 50
- CA$6,650
- the most one event can ever cost, whatever happens past 1,000
Activated means the person claimed their invite and opened the app. Not when you import them, not when the invite is delivered, and not if they register and stay home.
Questions people actually ask
What is the capacity of Louis B. Stewart Observatory?
Not published. Neither a seated capacity nor a floor area for Louis B. Stewart Observatory appears in any of the open sources behind this page, so quoting one would be a guess. The venue will give you the figure; ask for seated, theatre and reception separately.
Where is Louis B. Stewart Observatory?
12 Hart House Circle, Toronto, ON. It is 4.8 km (3 mi) from the centre of Toronto. The nearest major airport is Toronto Pearson International Airport (YYZ), about 19 km (12 mi) away.
What does an event app cost for an event at Louis B. Stewart Observatory?
240 activated attendees means 190 billable after the free 50, so CA$1,330 for the event. That example is a plausible programme at a venue of this kind in Toronto. The rate is CA$7 per activated attendee beyond the first 50, and the total for one event stops at CA$6,650 however many more attend. Activated means the person claimed their invite and opened the app. Not when you import them, not when the invite is delivered, and not if they register and stay home.
Is event67 affiliated with Louis B. Stewart Observatory?
No. event67 is not affiliated with, endorsed by or connected to this venue or its operator. This page is compiled from open data — OpenStreetMap, Wikidata and public census sources — and links to the venue’s own website where one is published.
What else is nearby if Louis B. Stewart Observatory is booked?
The Great Hall, Palais Royale and Metropolitan United Church are in the same city and have their own pages here. 254 venues in total are mapped in Toronto.
Keep reading
Elsewhere in Toronto
- The Great Hall
event space
- Palais Royale
event space
- Metropolitan United Church
event space
- Concert Stage
event space
- Hosting an event in Toronto
What kind of event is it
Running an event at Louis B. Stewart Observatory?
Bring the schedule, the invites and the arrivals into one branded app. Free for your first 50 activated attendees, on one live event.