Probably concrete, per cross section from Oxford 100 Adelaide:

OP001-03-C01-R01-Section-Cutaway_Update_No_Shadows.jpg


AoD
 

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Although, if you did a section through a steel frame building, other than through one of the joists, you would see a concrete floor. Particularly if you were drawing a section for sales purposes, and not for technical reasons, as seems to be the case with the picture above.
 
Although, if you did a section through a steel frame building, other than through one of the joists, you would see a concrete floor. Particularly if you were drawing a section for sales purposes, and not for technical reasons, as seems to be the case with the picture above.

Good point, though one should still see some sign of floor trusses, and I think you'd end up with a floor with a flat profile (concrete on decking).

AoD
 
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True. I wonder though if the key message of that section to prospective tenants isn't "Windows unobstructed by HVAC vents!" or "All your cables go in the ceiling!"
 
I'm surprised these days when office towers don't go in with raised floors as it does seem to be the far easier way to get cables to desks.

42
 
From DCN:

OFFICE BUILDING Proj: 9170747-4
Toronto, Metro Toronto Reg ON NEGOTIATED/WORKING DRAWINGS
Ernst & Young Tower, 100 Adelaide St W, M5H
$175,000,000 est
Start: June, 2014 Complete: June, 2017
Note: Demolition of existing building is underway and completion is anticipated by the end of 2013. Sub trades will be retained through an invited process. Further update late 2013.
Project: cast-in-place concrete structural frame, fuel fired heating system, construction of a 40-storey (two floors mechanical) office building. This building will be LEED Platinum CS certified.
Scope: 900,000 square feet; 40 storeys; 5 storeys below grade; 1 acres
Development: New
Category: Commercial offices
Owner Complete information is available to subscribers. Click HERE to find out how to subscribe.
Gen cont Complete information is available to subscribers. Click HERE to find out how to subscribe.
Demolition cont Complete information is available to subscribers. Click HERE to find out how to subscribe.
Architect Complete information is available to subscribers. Click HERE to find out how to subscribe.
Architect Complete information is available to subscribers. Click HERE to find out how to subscribe.
First report Tue Jan 08, 2013. Last report Wed Jul 10, 2013.
This report Thu Sep 19, 2013.

http://www.dcnonl.com/cgi-bin/top10...f4d67721924271997ed93a22eff&projectid=9170747
 
When this project is completed, hopefully it'll have a big, beautiful Ernst & Young logo high atop the sides of it.
 
Probably much cheaper to go with dropped ceilings, as they wouldn't have to support as much weight. But that is just a layman's guess.
 
A drop ceiling in cheaper. Servicing through a drop ceiling is cheaper/ easier as well. No need to take apart workstations to remove floor panels. Tenant improvements such as eletrical and data to the workstations is relatively minor compared to building services such as lighting and sprinklers.
 
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