LOS ANGELES (CBSLA) — The National History Museums of Los Angeles County says they are projecting a $13 million loss in admissions revenue due to being closed because of the coronavirus outbreak.

LOS ANGELES, CA – JUNE 12: A drone aerial view shows the NASA Los Angeles County Historical and Art Museum building at the Natural History Museum of Los Angeles County at Exposition Park as Los Angeles County allows more businesses and facilities to reopen today, despite rising COVID-19 infections and deaths on June 12, 2020 in Los Angeles, California. (Photo by David McNew/Getty Images)

The group operates the Natural History Museum in Exposition Park, the La Brea Tar Pits in Mid-Wilshire and the William S. Hart Museum in Newhall.

In a letter to members, the museum group says its curators have continued their research and virtual programs. But, with the museum shut down since March with no reopening in sight, the museum is working to adapt to the current economic climate.

As a result, the Natural History Museums is offering members an extension of their membership by one month for each month it is closed – but is also asking them to considering opting out of that extension and instead renew their membership by the original expiration date.

“By renewing your membership and opting out of the extension, you will help us to continue to operate our museums and continue the scientific, historical and cultural work that makes us such a valuable civic resource for our community,” the letter said.

Most museums in Los Angeles remain closed due to the ongoing pandemic.