A former office block dating from 1960 had previously been renovated and extended. This building on Blaak has now been converted into a residential block, comprising 322 affordable rental flats. The new residential scheme is more than twice as heavy as the original office block. However, demolishing the foundations right next to cables, pipes and the metro tunnel was not an option. Consequently, the basement has been retained and a second set of foundations has been added, with piles reaching down to a deeper layer of sand. Within the old footprint, a new 24-storey residential tower has been designed, just below the sprinkler limit.

The four-storey plinth enhances the vibrancy of Blaak and the city centre with public and communal facilities on the lower levels. There is space for 1,000 bicycles and a limited number of shared cars. This has maximised the available floor area for housing, amenities and green spaces.

The original structure of a tower set on a plinth has been given a new expression and new proportions. Balconies on all sides create rhythm and depth in the façade. The walls between the flats are staggered on each floor. This rhythm is inspired by the abstract reliefs of the artist Jan Schoonhoven. The rear façades reinforce this effect. Repetition, shadow and light lend the façade a subtle layering that changes throughout the day. At the same time, the balconies provide each home with a generous outdoor space and shade in summer, whilst forming a transition between the interiors and the city. The building is crowned by a taller top storey.

On the fourth floor is a communal roof garden featuring native plants. Together with the communal spaces in the plinth, the garden adds a social dimension to living. Blaak 333 thus brings together living, community and mobility in a place where the city is constantly on the move.