From Linate Airport
As an alternative to taking a taxi, you can take Bus 73 and get off at the final stop in Piazza San Babila. From there, take the Red Metro Line (M1) and get off at Porta Venezia.
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From Malpensa Airport
You can take the Malpensa Shuttle to Milano Centrale train station, then walk to the office.
Alternatively, take the Malpensa Express to Cadorna Station, then switch to the Green Metro Line (M2) and ride to Centrale.