Fairfield's downtown U.S. Post Office will close its doors at 1 p.m. Saturday at its longtime 1262 Post Road location and reopen Monday in a new storefront a few doors away at 1300 Post Road, next to 16 Handles frozen yogurt store.

The new post office will offer 24-hour lobby access so that those with a postal box can retrieve mail any time of day or night. Customers who have a postal box will keep the same box number, but will need to get a new key. There will also be a handicapped-accessible counter, and the business hours will remain the same: Monday through Friday from 9 a.m. to 5 p.m. and 9 a.m. to 1 p.m. Saturday.

"We are very pleased to move to our new facility," Postmaster Dennis Kassimis said, "and we look forward to providing continued excellent service to the customers we serve each and every day."

Once local mail-sorting operations were moved from the Post Road office to the post office on Commerce Drive, Postal Service officials decided to move to a new, smaller storefront downtown.

The original Fairfield Post Office is a one-story brick building constructed in 1935 and, among its features, is a New Deal-era mural from 1938, "Tempora Mutanur et Nos Mutamur in Illis." Officials are still looking for a home for the mural.

The building was bought in May for $4.3 million by 1262 Post Road LLC, an affiliate of Westport Capital Partners, an institutional investment firm on Danbury Road in Wilton. The owners recently filed an application with the Town Plan and Zoning Commission to renovate and expand the structure to house from one to three commercial tenants.