The States’ ‘One Front Door’ building on La Motte street is now open.
The Taxes Helpdesk and Treasury Cashiers are the first of many government services to move in.
Eventually all frontline customer services will relocate to Philip Le Feuvre House.
The single point of contact has been created so that islanders don’t have to visit multiple offices to deal with government.
The Social Security building was chosen because it already has the highest footfall.
Customs and Passports will move in next week, followed by Planning and Building Control in a fortnight’s time.
Cyril Le Marquand is now closed to the public, except for appointments.
The States says is also moving more services online and centralising phone numbers into a single contact centre.

'Momentous' week in Jersey's States
Plans to charge wealthiest patients for medical travel
Railway Walk reopens 'several weeks' ahead of schedule
New bar opening at former Rojo and X site to evolve Jersey's nightlife
Former Chief Minister seeks re-election
Château Vermont to become home to new music campus
St Saviour break and entry suspect pictured posing on motorbike
'Overstretched' neurology department following under-experienced managers