This Amsterdam apartment is a renovation project by Mamm Design of a duplex unit in an 85-year-old housing for a family of four. Since they have not been brought up in Amsterdam where they have a lot of gloomy weather, their request was to have maximum sunlight in the house. Kitchen, bathroom and toilets are packed into the tower, utilizing existing pipe box. Kitchen, bathroom and toilets are packed into the tower, utilizing existing pipe box. The designers took away the stairs, walls and a part of the upper floor’s slab, so that the sunlight can spread into all over the house, and the family was connected at the same time, just as they wanted.