The Centurion, the city's first residential condominium designed by I.M. Pei's Pei Partnership Architects, made a pretty quiet debut on the Manhattan market. And although 12 sales in the building have hit public record, the most recent closing was in September '09. Which means, of course, that it's time for a relaunch, and a Price...Upper? According to StreetEasy, eight of the 12 units currently on the market in the building saw their prices upped this weekend by as much as 23 percent. The other four units got chopped. We don't see any kind of pattern to the pricing, but here are the details: the most expensive apartment, #PH2A, is now $12,878,500, 15 percent more than it was last week. The least expensive unit, the 3BR #4E, is now $2.995 million, down a bit from $2.999M. The blue ribbon for biggest increase goes to #8A, which is now asking $3.35 million, 23 percent more than it wanted last week. Somebody getting a little greedy, or are these realistic expectations for NYC's first residential condo ever to come from the minds of I.M. Pei and his descendants?