Are there copyright issues of use our own drawing of an historic building?

I am thinking of using an artist’s interpretation of a local, well recognized building, but the building is a historical museum. Do we need to worry about copy-right infringements if it's our own drawing, not one of the museums? I know they request you ask permission to use any photos of theirs, but if it's our own drawing, do we still need permission? The company I work for has nothing to do with the museum in any way.