Fallout 4: Mass Fusion Building Location Guide & Loot

The Mass Fusion Building in Fallout 4 is a location that you can find in the Financial District in the center of the Commonwealth. You will have to visit it as part of the Mass Fusion main quest from the Institute. Also, you will have to go there during the Spoils of War quest from the Brotherhood of Steel.

In this guide, we will tell you about the Mass Fusion Building in Fallout 4 and the loot you can find in this location.

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What Is Mass Fusion Building In Fallout 4?

Mass Fusion Building is a huge building that you can find in the Financial District. It is divided into three sections and each of them contains some valuable loot. These sections are:

Main building (lower levels) – This is the central part of the building, and it has a lot of floors to explore. Some items in this section can only be obtained using a power armor with a jetpack.
Mass Fusion executive suite (upper level) – This is a structure that you can find at the top of the building. You can access it during the main quest.
Reactor – This section is the underground level of the Mass Fusion Building, and you will have to go there to get the Beryllium Agitator for the main quest.

How to Find Mass Fusion Building in Fallout 4

Fallout 4 Mass Fusion Building location on the map

The Mass Fusion Building is located in the Financial District. You will find this place to the south of the Boston Bugle Building. It’s really hard to miss as this thing is quite big compared to other buildings in the area. The structure looks like a vast red tower with the Mass Fusion logo on it. There, you will encounter lots of enemies and find many cool items that will help you on your journey.

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Mass Fusion Building Loot In Fallout 4

In the Mass Fusion Building, you can find various items and equipment. Let’s take a look at some things that might be helpful on your future adventures. Here’s the most notable loot:

Overdue Book 1 – Can be found on a desk in the northern part of the fourth floor.
Mini Nuke – On the fifth floor in the room with the Gunner Commander.
Power Armor – Worn by the Gunner Commander.
Strength Bobblehead – On the head of the big statue on the fifth floor.
Mass Fusion Labs Key – On a desk in the northwestern section of the eighth floor.
Tesla Science Magazine #5 – In the southeastern section of the ninth floor.
Freefall Legs – A unique item that you can find in a safe in a room on the eastern side of the building. You can access it through a hole in the wall near the roof. It should be on the third floor from the top, and you will have to use a jetpack to get there.
Jack Rockford’s log – Can be found in the room with Freefall Legs.
Fusion Core – In a destroyed room on the fifth floor from the top. It should be near the office with Freefall Legs, and you will have to use a power armor with a jetpack to get there.
Mass Fusion executive ID – This can be found on a desk in the Mass Fusion executive suite. It is only available during the main quest, and you will have to find this item as part of it.
Mass Fusion executive lab password – This is on the same desk as the Mass Fusion executive ID.
Oslow’s office recording – Can be found on a table in the executive research lab on the upper level.
Damaged hazmat suit – In a drawer on the Reactor level.
Overdue Book 2 – On a desk on the Reactor level.
Hazmat suit – You can find two of them on the Reactor level. One of these suits is in the locker room, and the second one is near the analyst’s terminal.

These are the most notable items you can find while exploring the Mass Fusion Building in Fallout 4. Some of these things are related to the main quest, while others may be useful in your journey. But be careful, as there are lots of enemies that can be problematic to deal with.