putting company sign on building and making it look 3D

Hi, i'm trying to help visualize a sign on the building
I have successfully put this sign on the building
However, I would like the sign to look a bit 3D:

Here is without sign
with logo
office with logo
what effect would i use to get it looking like 3D letter on the building?
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Well, if you want to keep it simple just use the shadow and emboss effects in the layers tool in Photoshop. This would be a quick and dirty way to do it and it can be improved by which effects you use to achieve the 3D look.

If you want a more refined 3D look. Then use any of the many 3D rendering tools out there (3D Studio Max, Maya, Blender, etc.) and create a 3D logo that you can then import into Photoshop and layer onto the photo. Blender is free and very capable. Any 3D software you use will have a bit of a learning curve but it is the only way to get a true 3D look.
websssCEOAuthor Commented:
Any idea what type of settings for bevel emboss i should use? everything i use looks fake

See attached (you will need to remove .txt from end as it wouldn't allow me to upload)
The settings can vary but you will want to use drop shadow and bevel and emboss effects. As to the exact setting, I recommend you play around with them but I would suggest ones that give you enough shadow to make the it look like it is casting shadow on building correctly, and sett the emboss and bevel accordingly. I would suggest a minimum bevel to give logo an extruded shape.
You can try text layers with varying light shade (same one color) in one particular direction with fake shadow...

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