A total of 103 homes will be built behind the brick facades.
Dramatic brick archways will form a colonnade along the ground floor, reflected back in a water feature in a central courtyard. White-washed vaulted communal spaces will feature at the entrance.
Arches will also feature at the top of a multi-storey block of apartments that will have a row of recessed balconies.
"We've created a new language of brick arches and vaulted spaces that echo the exuberant architecture of King's Cross and St Pancras stations," said architect Alison Brooks, founder of Alison Brooks Architects.
"It will reveal itself slowly as you move around and through it."
Designed for developer Argent, the 103 homes will be a combination of studios, and one, two and three bedroom apartments.
Small homes developer Pocket Living will be managing the other 60 units in the development, renting them out to local workers on middle incomes.
Pocket Living collaborated with architecture studio Metropolitan Workshop to build a 27-storey tower of 86 apartments in Wandsworth.
Heatherwick converted two 19th-century coal houses for the project, adding swooping slate roofs that meet in the middle.
A large swathe of land behind the King's Cross railway station is under redevelopment. Victorian gas holders have been turned into housing by WilkinsonEyre, and both Facebook and Google are building office blocks.
Alison Brooks founded her eponymous architecture studio in 1996 The studio was a finalist for the Mies van der Rohe Award for a development of 44 homes that is part of the South Kilburn Estate Regeneration Masterplan.