The United States Postal Service branch in Marina del Rey will be forced to move after its lease at the Waterside shopping center on Admiralty Way expires in May.

“We’re not going to close the post office, but we will have to relocate it,” USPS spokesman Richard Maher said. “The landlord has notified the Postal Service that they will not renew our lease, which expires May 31, so we are looking for a new location for the Marina del Rey post office that’s as close to the current location as possible.”

The Postal Service has maintained its branch at 4766 Admiralty Way since 1990. The post office’s footprint there was reduced several years ago at the landlord’s request, Maher said.

The 133,000-square-foot Waterside center is owned by developer Rick Caruso’s Caruso Affiliated Holdings LLC.

A Caruso Affiliated spokesperson could not be reached.

Marina del Rey community activist Lynne Shapiro said the Waterside post office branch will be missed.

“It’s a shame that the post office is losing this central location,” said Shapiro, who worries that intensified development of the marina is driving up rents and driving out businesses that serve residents’ everyday needs. “I don’t know how they’re going to find somewhere as accessible in the marina.”

Caruso Affiliated re-launched Waterside in 2005 as “an upscale neighborhood destination,” according to the company’s website. Current tenants include a California Pizza Kitchen, Pinkberry, Starbucks Coffee and several high-end clothing retailers     — Joe Piasecki

Editor’s note: This post has been changed to properly identify Lynne Shapiro.