The Quincy Center MBTA parking garage will be closed indefinitely, after studies found that the structure is unsafe.

The Massachusetts Bay Transportation Authority ­announced Tuesday afternoon that engineers have determined that the 41-year-old garage, the oldest of the T’s garages, has significant ­water damage and patterns of deterioration in the concrete.

The garage will be closed starting Wednesday.

“With public safety as a top priority, the MBTA has decided to close the garage indefinitely,” spokesman Joe ­Pesaturo said in a press release. “There are no issues with the Red Line and commuter rail stations at Quincy Center . . . The garage is an entirely different structure.”

The damage was not the ­result of any recent storm, ­Pesaturo said. He said an average of 450 vehicles park in the garage on a typical weekday, which should be easily ­absorbed by parking facilities at the Quincy Adams and North Quincy stations.

‘With public safety as a top priority, the MBTA has decided to close the garage indefinitely.’

Quincy city officials said they were informed of the change Tuesday and were not concerned about parking needs or the structural integrity of the station itself.

“The garage at last report was not well used,” said mayoral spokesman Christopher Walker. “It was around 50 percent capacity . . . [and] the T has told us that the issue is relative to the parking only.”

Walker said Mayor Thomas Koch was hopeful of a long-term solution.

“The mayor has had several discussions with the appropriate people at the T, and there are ongoing talks relative to the long-term future of the station and the parking situation,” Walker said.

Renovation “is not specifically within the agreement that exists right now, but obviously long term, it is part of the planning process.”

Pesaturo said the MBTA plans to work with the city on any decisions about the garage.