From Milano Centrale railway station, walk this route or take an M3 subway train to Montenapoleone (one minute to the office). 

From Milano Porta Garibaldi railway station,  walk this route or take a M2 subway train to Centrale FS M3, then an M3 subway train to Montenapoleone. 

From Milano Linate airport, take an M4 subway train to San Babila; then get a taxi or walk this route. 

From Milano Malpensa airport, take a Malpensa Express train to Milan Centrale railway station, then an M3 subway train to Montenapoleone.