The Penobscot Building's lobby is more or less original.

The image of the big room is of the banking hall on the second floor. I think this area has been converted to a conference room, but I'm not sure, and I'm not sure about the extent of any modifications to this room. There were, however, stairs which led straight from the lobby up to the banking hall, and those were removed.

The Penoboscot Building was built as a speculative office building with Guardian Bank as the main tenant, and with a banking hall built for them within the building. What is now the Guardian Building was built for the Union Trust Company, but the banks were growing and merging so quickly at the time once the dust settled Guardian was HQed in the Guardian Building. ...and then the Great Depression happened...