Art Deco Apartments, London

This is one of those cases where I've come across a folder with some pictures of a wonderful but if I ever knew exactly what the building is called then it is long since lost.

I can tell you that this block of apartments is in North London, around the Finchley or Hampstead area I think.

The set of photos is called Riverside so I presume that is the name of the apartments or the street.

Can anyone help?

[Scroll down to see the doors and you'll really want to find out where this building is]