When I saw this I wondered what the large building was in the centre. Another of the postcards soon told me.
|Het Witte Huis (The White House)|
The White House was one of the few buildings in central Rotterdam to survive the German bombing campaigns in WWII. It was built in 1898; I found this photo of it in the American Library of Congress,
|Het Witte Huis - 1900|
And a much more recent picture too of what has become a National Heritage Site.
|Het Witte Huis Rijksmonument 2007|
(Photo by F Eveleens - CC BY 3.0 unported license)
Rob from Amersfoort kindly gave me this lnk to an old map in my previous post on Rotterdam - http://www.engelfriet.net/Alie/Hans/stadsplattegrond1897.jpg
If you view and enlarge the map The White House is situated on the end curve of 'Haven; above the Maas Hotel (in red) where there appears to be a letter 'E'.