The Architects Newspaper has some stunning photos of the interior and exterior of the Williamsburgh Savings Bank at Broadway and Driggs (George B. Post, 1875 and 1905).
They also have news on the plan for the building, which is for a catering hall and gallery/museum. But no word on what is to happen on the former parking lot to the west. Though, as A|N notes, it is as-of-right for residential with ground floor retail (also no word on the floor area – the bank may well have excess air rights that can transferred over to the development site portion of the project).