What is the real-life inspiration for the Arconia building in NYC?

The real-life inspiration for the Arconia building seen in Only Murders in the Building is the Belnord, located at 225 West 86th Street on Manhattan's Upper West Side. This historic landmark was built in 1908 and occupies a full city block close to Riverside and Central Parks. Its Beaux Arts architecture features vaulted entries, iron gates, and a serene courtyard, offering a quiet-luxury aesthetic that's both historic and modern. The Belnord's fusion of grand classical design and updated amenities creates the perfect blueprint for the Arconia's stylish yet livable elegance.