The glass skin that front the building's three overground storeys is visible through the window and door openings of the original facades. It also rises above the terracotta-tiled roofs of neighbouring properties in a few locations.
"The new facade with an elaborate glass finish produces a play of crossed reflections inside; an interaction between two facades that creates a space of rich intensity," said Mangado.
Behind the facades, the museum sprawls out to frame a courtyard in the centre of the block. Glazed walkways traverse the courtyard, connecting to further galleries at the rear.
"Through luminous glazed catwalks, the courtyard becomes a place for encounters and an element connecting the various buildings of the museum complex," said the architect.
Inside, a series of double- and triple-height galleries are linked by a timber staircase, which ascends through an angular space with a skylight overhead.