Acacia or Mimosa?

A wonderful specimen in the front garden of a design project ive recently acquired in North London, very large and unlike anything else in the street, really grabs you. Client is unsure but my initial response was Mimosa.

The rear garden for the house is situated in the middle of a square of surrounding houses, having all the rear gardens of these houses backing onto the plot of land. Very fortunate for the owners to have half an acre of blank canvas in Crouch End! The space is viewed from all the surrounding property's so it needs to come alive.Only minor issue is the small sub station in the south east corner which needs access for the transformer to be changed. Being south faced, should be a nice project.