Imagine that from now on you never have to leave your building to go to your luncheon club, barbershop, spa, salon, gym, rare book library, or billiard hall. Rock bands and swing bands regularly perform in the ballroom.

Your valet books your flights, your butler polishes your car, your maid brings you a bottle from the wine cellar, and a Playboy Playmate — wearing only bunny ears — fetches you the latest issue of Barron’s.

Okay, the Playmate item is my addition, but you get the idea. This apartment building is all about catering to a hip, young, affluent lifestyle.

There are several developments jumping on this trend, but the Cipriani Club Residences at the old exchange at 55 Wall St. (later the Regent Hotel) are the penultimate in this category.

We like clever. Which is why we think ingenious architect Calvin Tsao’s collection of three design themes — sleek, classic, and eclectic — capture the kind of desired resident at 55 Wall St. All the apartments, from studios to two-bedrooms (ranging between about $1 million and $3 million), are fully furnished in these handsome themes, right down to the dinnerware in the teak cabinets. Nearly every room of the complex is equipped with at least one plasma screen television system. Think about it.

The idea is that the bright young things who move into 55 Wall St. can’t be bothered by the laborious task of buying furniture and flatware. Their lives are far too exciting to run errands.

The fact that many of the enormous kitchens only have two gas burners on the stove shouldn’t surprise anyone, either: They’re not going to slave over a stove for any reason. If they’re to enjoy a meal in the apartment, it’s cooked by somebody else. And it’s a job for somebody else to worry about.

Even the people who now call 55 Wall St. home go along with the threethemed design concept. Margherita Missoni, heiress to the fashion house, chose sleek. The son of the president of Kazakhstan (no Borat jokes, we promise!) prefers the classic design theme. And pickled actor Mickey Rourke is certainly eclectic.

Besides idiot sons of powerful politicians and cute daughters of rich fashion executives, 55 Wall St. boasts other children of the jet-set elite. Plus, don’t forget those investment bankers who will soon be rolling in their fat 2006 fiscal year bonuses, and whose offices are just blocks away.