The scheme, which is being dubbed a 'jewel box' by planners, sits on the fringe of the massive King's Cross redevelopment.
According to the practice, the planners wanted 'a jewel box', reflecting the open aspect of the site opposite Grimaldi Park and its listed church, and on a long vista from Pentonville Rise. The skin of the building will be a profiled perforated brass with flush windows.
Hamiltons director Craig Casci, said: 'Brass is a more dynamic material than bronze or copper, it will start changing its reflective properties as soon as it's unwrapped.
'The fins on the skin of the development will also shed water unevenly, leading to certain areas staying brighter longer - every year the fabric will look different.'
The building will consist of 26 flats, 44 per cent of which will be affordable. The practice received planning permission last month, and it hopes to start on site early in the New Year.