Housing, health facilities and social spaces are all contained within this plant-covered Singapore building by WOHA, which was named World Building of the Year at the World Architecture Festival.

Singapore-based WOHA designed the mixed-use Kampung Admiralty building according to a "club sandwich" philosophy, with different functions layered on top of each other to create what the architects described as a "vertical village".

This is topped by a roofscape of staggered terraces covered in local plants, which functions as a community park.

"The traditional approach is for each government agency to carve out their own plot of land, resulting in several standalone buildings. This one-stop integrated complex, on the other hand, maximises land use, and is a prototype for meeting the needs of Singapore's ageing population.

The lower levels contain the People's Plaza, a "community living room" with shops, eateries, and access to a tropical garden.

The medical centre is located in the middle floors, while the topmost layer contains studio apartments, as well as the green spaces.

The amount of green space on the building greater than the building's overall footprint. This includes small farm plots for residents to tend to, organised as part of a "village green" at the centre of the 11 housing blocks, containing 104 homes for elderly singles and couples.

"This is a project that does something necessary in an intelligent fashion from the way it connects to transport to its natural ventilation strategy, all benefitting from a decision to layer a series of buildings rather than separating them into separate tall blocks," said WAF director Paul Finch.