Upper West Siders, especially those in walk-ups or prewar buildings, might experience sticker shock over the asking rents in a new building that is rising on West 80th Street. The 19-story newcomer, nearing completion across Broadway from Zabar’s, has rents that start at — wait for it — $10,000 a month, and climb to $25,000.

And for all those stunned by those prices, there’s this: The building, developed by Rose Associates in partnership with Friedland Properties, is already 30 percent leased, despite still being in the “preview” stage, with brokers and prospective tenants checking it out on hard-hat tours. Some renters will move in this month.

“It’s a very specific slice of the market,” said Amy Rose, the chief executive and president of Rose Associates, during a recent walk-through with a reporter.