The Oculus skylight, which has been leaking since 2018, will undergo an estimated $200,000 repair as Port Authority officials await the completion of an engineering analysis on a mechanical system responsible for opening and closing dozens of glass panels along its 355-feet arched ceiling.

Steve Coleman, a spokesperson for the Port Authority of New York and New Jersey issued the following statement:

“Following the advice of expert consultants, we are conducting engineering analysis on the Oculus skylight’s 120-motor mechanism that opens and closes the roof, and we are carefully reviewing the best approach to repair a complex, one-of-a-kind architectural feature. Our priority is to get it right. While that analysis is on-going, we are taking prudent steps to better protect the skylight with a more durable barrier system.  On a time and materials basis, we estimate the installation of this system to cost approximately $200,000.”

The barrier system involves installing a waterproof membrane to seal the skylight, according to the Wall Street Journal.

The WSJ also reported a source saying the Port Authority has spent $50,000 in water-resistant tape, previously identified as Flex Tape, to patch up the skylight. The previous estimate had been $30,000.

Intended as a tribute for September 11 victims, the $32 million skylight was designed to open every September 11th at 8:46 a.m., the exact time when the first plane hit the North Tower of the World Trade Center. But for the first time since the building opened in 2016, the skylight was kept closed during this year's ceremonies. Port Authority officials said it was because of the ongoing engineering analysis.

The $3.9 billion transit and shopping pavilion has been criticized for its bloated design and cost. The architect of the Oculus, Santiago Calatrava, did not originally call for a skylight but rather a hydraulic roof which would allow the wings of the building to pivot open up to 50 feet. But that plan was scrapped in 2008 amid soaring costs.

Calatrava has been celebrated for his grandiose and awe-inspiring buildings. But some of his designs have come under scrutiny for their cost overruns as well as structural problems. In Spain, a winery in 2013 sued the architect over a leaking undulating roof that compromised the humidity control integral for storing wines.

The New York office for Calatrava's architecture and engineering firm did not immediately respond to a request for comment. Back in 2013, he issued the following statement to the New York Times: “My goal is always to create something exceptional that enhances cities and enriches the lives of the people who live and work in them,” he said. "It has been a privilege to work on these projects, all of which are completed to the highest standards.”