особняк v angličtině:

it is a detached house in a quiet residental suburb

My parents live in a detached house in the suburbs of Bristol.

He've bought a nice detached house in the suburbs. Good place to start a family and rise children.

It was a lovely detached house with gardens on all sides.

We live in a detached house, so we don’t hear any noise from the neighbours.

My dream is to move to a nice detached house with a big garden.

semi-detached house

I live in a detached house in a suburb of a major city.

They live in a mansion.

The cat burglar must have entered the mansion from the roof.

It is not a real mansion.

If my house were a mansion, I would invite everyone I know to my birthday party.

In addition to a mansion, he owns a Bentley.

A government official's stately mansion was looted.

He was very rich, and therefore could buy a mansion.

Keisuke has always studied in this mansion. That style known as 'home schooling', right?

There are no fewer than a dozen bedrooms in this mansion.

It was as gloomy inside the mansion as the sunlight was dazzling outside.