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Magnus's apartment is a walk-up, in a building in an industrial neighborhood that has been converted into an apartment building. The building's interior was poorly maintained, with its dirty and rickety staircases.
His loft, however, was well-maintained and huge. It had a living room, a master bedroom, and three spare bedrooms. Magnus often redecorated drastically. Other rooms have been known to appear and disappear from time to time, such as Raphael Santiago's windowless room, that is later used as a bedroom for Rafael Lightwood-Bane  .
- Magnus may have lived in his apartment in Brooklyn for at least half a century, unless he lived in a different apartment in the 1950s in Saving Raphael Santiago.
- In The Fall of the Hotel Dumort and The Last Stand of the New York Institute, his apartment was written as being near Sixth Avenue and Christopher Street in the West Village neighborhood of Manhattan.