The entirety of Gwinnett County’s new courthouse parking deck is now open.

Phase II of the deck at the Gwinnett Justice and Administration Center — which houses courtrooms and government offices — opened last week, adding 600 new spaces. Throw that in with the 850 spaces offered by an adjacent deck that opened in May, and visitors now have nearly 1,500 new places to park their Priuses and pick-ups.

The new decks are located at the rear of GJAC, on the corner of Constitution Boulevard and Nash Street. The original parking lot at the front of the building is still open to the public as well.

The new parking options are part of a long-awaited $75-million expansion at the courthouse.

The larger project is already underway and will include adding a brand new 180,000-square-foot building with a larger jury assembly room, four additional courtrooms and room for several more to be added in the future.

Eventually, the new parking decks will be connected directly to the courthouse via pedestrian bridge.

The expansion was planned nearly a decade ago — and is being paid for by 2009 SPLOST collections — but was delayed by the Great Recession.

Construction is scheduled to be completed in 2020.