I think both buildings have architecture representative of the old, but will there be one that can meet the challenge of being converted to a greater extent?
both buildings are in Manhatan NY

The red building (Delmonico’s Restaurant) is a restaurant and departments
The white building (German Bank Building) was a bank but today works as departments as well

May be to choose something I need create some sketches to develop the best option
I would like read your opinion to help me to decide

Cheers