SPOILERS! Alex Yu's Office

[Quake Nukem]

so when i enter the Arbotarium (may be wrong spelling) I see Alex Yu's office but you can't access it due to the grav lift being disabled. Instead of finding the correct keycode I went and jumped on top of the terrace roof then jumped on the giant tree which you can carefully walk up then jump to the balcony walkway where you would get off if you took the grav lift. Once you get in Alex Yu's office you'll notice their is a item blocking entrance and if you dont have your leverage skilled up you can use a recycle nade and gain access to the shaft where his safe is at. You should have the passcode already on you from earlier objectives.

[Bazzy]

I still haven't found the location you are describing here.
I think i have to look up a video, becasue after clearing everything out there was i just have no fun running and searching this area any further today.

[Breach]

This game is so vulnerable to speedrun exploits that it's unbeliavable ;)

[Herbalacious]

There's another entrace to Yu's office. In one of the corners of the room there's a looking glass area. Break the glass..

[Quake Nukem]

Also the water fountain/waterfall is all looking glass which you can break to easily access underneath.