A Russian billionaire may have purchased the $88 million penthouse, but 15 Central Park west is chock full of other rich folk, too. It's considered one of the premiere buildings in which to own a trophy apartment, and the five active sales listings—including a $95 million apartment owned by steel magnate Leroy Schecter—average more than $6,100/square foot. All past recorded sales clock in around $4,500/square foot.

If it's any indication as to how whale-worthy 740 Park Avenue is, author Michael Gross penned a book about the building called "740 Park: The Story of the World's Richest Apartment Building"—and it's being made into a movie. In a New York Magazine showdown back in 2010, the limestone beauty bested 15CPW as the most powerful building in the city. Last year, Courtney Sale Ross's 30-room duplex in the building sold for $52 million, setting a city record for the most expensive co-op ever sold (but that record has already been broken).

730 Park Avenue may be less famous than 740 Park, but it's filled with no less rich people. Billionaires were competing over a quietly listed $35 million apartment of a former Goldman Sachs banker, and the mysterious place sold for $39 million without so much as one photo ever hitting a public listing.

Created by the same architectural mastermind who built the Plaza, the Dakota is one of the most recognizable and prestigious buildings in the city. Co-op prices here average $3,000/square foot, and it's been featured on "Secret Lives of the Super Rich." Wikipedia has a long list of notable residents who have lived here, with John Lennon no doubt being the most famous.

Another classic, 810 Fifth Avenue has housed members of the original pod of whales in this city. Most recently, a former Rockefeller co-op sold for nearly $24 million. A more modern billionaire family, the Bronfmans, have also called this place home.

998 Fifth was a Gold Coast pioneer, luring the Vanderbilts and Guggenheims away from townhouse living. One very whale-like feature? Every apartment has a jewelry safe in the apartment walls. Homes averaged $3,600/square foot. The maisonette finally found a buyer for $18.5 million, which is several million less than it was hoping

907 Fifth has made headlines as of late for being the locale of the late estate of Huguette Clark. The finicky co-op board prefers finance billionaires to Qatari prince billionaires, and though sales here don't reach quite as high into the stratosphere as some other buildings on this list, they still average more than $2,500/square foot.

Sales here average $4,000/square foot, but most recently, the building has been in the news not for its most recent high-priced listing, but for the man who is trying to sell it: fraudster Hassan Nemazee. He's behind bars, but the feds are asking $19.5 million for his duplex.

For a brief period last summer, the Ritz joined the leagues of apartment buildings trying to get $95 million for a unit. The penthouse was taken off the market last October, but that doesn't seem to indicate a sale. Casino kingpins, hedge fund managers, and members of Forbes rich list are the types of people who live here. You know, the really wealthy types.

One of the newest buildings on this list, the Park Imperial is just over 10 years old. Homes here fetch around $3,000/square foot, and currently the most expensive available unit is a $9.95 million 3BR. Derek Jeter, P. Diddy, Fugitive Jacob "Kobi" Alexander, E! television founder, Daniel Craig, and Equinox CEO are just a few of the rich people who call/called this building home.

When trophy property collector Michael Hirtenstein has owned in a building, you know it's whale-worthy. The obscenely priced apartments at the Time Warner Center are too many to detail, but a few notables include the building developer's recently-sold $13.8M 67th floor condo and the 75th floor unit of 27-year-old Russian rich girl Anna Anissimova, who tried to sell last year for $50 million.

Converted to a condop in 2005, 110 Central Park South has seen a lot of interest from the wealthy, including the model wife of Russian billionaire Andrey Melinichenko. Homes here average $2,400/square foot, but the penthouse recently sold for $18 million, or $4,300/square foot.

When Olympic Tower was built in 1975, New York's rich were totally unfamiliar with the concept of a condo, having only lived in co-ops or townhouses. Greek shipping magnate (and husband of the former first lady) Aristotle Onassis financed the building, and an early buyer was '80s arms dealer/playboy/international man of mystery Adnan Khashoggi. It may not be the most expensive today, but it's a hotbed for billionaires.

Of course a Donald Trump building attracts billionaires. Sales in the Trump International average around $4,000/square foot, and the places are usually decked out with the most ridiculous decor. Think tiger rugs, Buddhist statues, purple velour couches, and zebra-print chairs, but really, what else would you expect?

Home to a penthouse with its own jogging track, 7 Hubert Street is one of the fanciest buildings in Tribeca. Rich lady and real estate whale Courtney Sale Ross also owned three apartments in the building. Most recently, one of the penthouses (not the one with the jogging track), was listed for $17.5 million, but it's since been delisted.