Essence of Aether is the final Tier 3 mission for Act 2 in Modern Warfare 3 Zombies. Jansen tasks you with retrieving Essence samples from three different areas in Urzikstan, one of which is the Quadri Shopping Center. Here's how to find this building in MW3 Zombies.
Essence Of Aether Mission Guide for COD MWZ Zombies – Where to Find All Containers
The Quadri Shopping Center is located in the western part of Zaravan City at map coordinate C6. This POI is located in the southwestern part of the map. I've marked the map image above with a yellow pin that shows the exact location of the shop you need to visit in the Shopping Center to collect the quest item for the Essence of Aether mission.
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The shop is a small eatery where you can find the Essence container on top of the counter next to the cash register. Approach the container and you will be prompted to collect Quest Item Quadri Shopping Center Essence Sample. Make sure to select and activate the mission before loading a match to avoid any issues with the quest item.