I think he means the office in Sosua. If you go to the traffic light and you walk down the hill, the place will be on the left side. (That little section of road is one way coming up the hill, I believe. )
Other people like the fellow in the Orange telephone Plaza in Sosua that is located near the Banco Popular. His name is Masaki. His office is among a group of offices on the first floor behind the Orange store.