But on Sunday, the pressure was on. Employees said it was a challenge to move so much so fast.

Tiffany was determined to open for business in the temporary store on Monday morning. The company considered having a “down day” between when the old store closed and the temporary one opened, to have more time to pack, move and unpack. But officials decided to do it all in the 18 hours between when the old store closed on Sunday and the temporary one opened for the first time.

“They say moving is stressful,” Michael Vanderheyden, who has sold jewelry on the main floor for 35 years, said as the packing began, “and I’ve been anxious for the last two or three weeks.”

Employees appeared less concerned about the security — they handle expensive items every day without losing them — than with the process: scanning bar codes, packing boxes and loading carts. And, once the carts were on the way, workers had to learn their way around the temporary store, down to which drawer the ribbon would be in when they needed to wrap a little blue box.

But this is not Holly Golightly’s Tiffany. Last year Tiffany agreed to a $16.2 billion deal to be sold to the luxury giant LVMH Moët Hennessy Louis Vuitton. LVMH Moët Hennessy Louis Vuitton also owns Christian Dior, Fendi, Givenchy, Guerlain, Dom Pérignon and Bulgari (whose store is across from the one Tiffany is renovating).

Tiffany has worked to update its image in the last few years. In 2018, the rapper A$AP Ferg did a remix of “Moon River” with the actress Elle Fanning in a nod to “Breakfast at Tiffany’s.” And, ever since Tiffany opened a cafe in 2017, it has been possible to do what Holly Golightly did not — have breakfast inside the store.