I agree 100%The only way to be sure is to consult a structural engineer. You need the house blue prints (or at least the construction methods) & where you intend to place the tank.
You will be fine as long as you put the tank along a load-bearing wall.
... I am almost positive a large apartment complex like mine wouldn't even allow a 55 so I can't risk them finding out...
Without the plans, you can't tell what is a load bearing wall ....
You can tell by the shape of the roof. The trusses of the roof will run perpendicular to load bearing walls. A wall that separates one apartment from another for example would most likely be a load bearing wall (if it runs perpendicular to the trusses).