mansionette

noun

1. (US)A large and somewhat luxurious house.

   “In the smaller plans of a "Mansionette near Wimbledon Park," "Semi-detached Houses," and "The Compact House built near Blackheath," we are not favoured with any scale.”

   “Trading in their battered RV and Louisiana swamplands for a sumptuous pink mansionette with swimming pool, the Malloys pull off their ruse with skill and also childish naïveté.”

2. (UK)A flat that spans two or more floors, and often has its own entrance (i.e. not off a communal hallway).

   “gone to London to work and had left her mansionette flat empty. The mansionettes stood on high ground overlooking the docks.”