Penthouse (emphasis on "a") is a large apartment on the roof of a multi-storey building. Initially, the word "penthouse" in English meant a technical loft - the construction of a multi-storey building on the roof, which served for technical needs, but over time people have seen that such premises can be converted into full apartments with terraces on the roof.
Modern penthouses are luxury and luxurious apartments with verandas and outdoor areas, decorated with lawns and flower beds. The cost of penthouses is significantly higher than that of conventional apartments in the same house. The reason for this is precisely the availability of additional open areas and an increased level of comfort. An additional bonus of penthouses is the absence of neighbors from the top.
Penthouse is on the list: real estate