After entering the building, go through the corridor and enter Daedalus' workshop. Inside you will find some teleports and lots of chests waiting to be opened.
Begin with turning the ballista (found in the middle part of the room) to the left and firing a rope. It will teleport a couple times and eventually allow you to get to a chest containing a Minotaur Horn [!!!].
Check out the right side and pull the lever found there. This way you will move the ballista to the upper level. Afterwards run up the wall on the right and get onto the platform behind the bars [RS]. There's another lever to be found there - pull it to lower two chests down from the ceiling.
Now you need to fire the ballista at the teleport in the front (after opening the gate using the same method) and knock the chests down. Inside you will find Daedalus' Schematics and a Phoenix Feather [!!!].
Leave the rope as it is, use the teleport on the right (the blue one) which will move you to a platform (with an experience chest on it), partly surrounded by bars.
Before you move on, fire the ballista into the left teleport once more. Thanks to raising it, the rope will allow you to get onto the platform with a Gorgon Eye [RS] [!!!].
Now you can use the previously unlocked passage and slide down the pipe. Once you're on your feet, approach the camera - you will find two chests there, one with experience and the other one containing a Minotaur Horn.
Now you just need to go down the corridor to the exit. This way you will begin the next stage.