Benevolent bank has history...
Oldest US bank. He was built by British in 1812. During the Civil War, the bank kept gold and first Roosevelt's bonds were issued, which you can see on the coin of 10 cents. And you know what? For all this time, he was never successfully robbed.

So, this is the Big Bank as you played.
Builded in complex of other building, ingame it's unknown things, except the parking and room during repair.
I build it as living lux-class house above parking, office building above the vault and middle sized museum on the left.

Of course, to be such it needs some mods, it placed here:
For 1.6.2 (Only, by technical reasons)

And i'm lazy to do full internal and external details like cornices and flags, will build it later.