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.

Jersey community unites out west for solar eclipse
A-level results day: "The grades you get don't define you"
Invite to 'Sponsor a Brave Bear' for families facing off-island treatment
Travel problems persist for some Jersey residents
The solar eclipse in Jersey: All you need to know
£1.2m in fines for missed Income Tax deadline
One in eight Jersey heatwaves has happened this year
Hydration breaks to be introduced at Battle of Flowers