New York City Mayor Michael Bloomberg reportedly has paid about $40,000,000 for a 10,821-square-foot mansion in Manhattan that is next door to a Beaux-Arts mansion that he purchased last year for $45,000,000 for his future foundation. The New York Observer's Max Abelson today reports that Bloomberg purchased the mansion at 1014 Madison Avenue, which was built in 1910, according to public records. For the last five decades, the mansion, which had not been officially on the market, has been used as a family-run art gallery. No public records yet show evidence of the sale of the building on Madison Avenue (whose parcel number is 1393-15), but we trust the Observer's information. The mansion is smack-dab next door to the 14,734-square-foot mansion at 25 E. 78th Street that Bloomberg purchased last year through his 25 East 78th Street LLC corporation, fittingly enough, for exactly $45,000,000, according to public records (we also should note that public records give that mansion the address of 1012 Madison Avenue). That five-story mansion, which was built in 1900, was designed by architect Stanford White and was the subject of a terrific profile in the New York Times recently. Bloomberg intends to use the mansion he purchased last year for the newly created Bloomberg Family Foundation, which he'll run after leaving office in 2009. We can only assume that the mansion that he reportedly has just bought will provide extra space for the foundation, although Abelson wondered if perhaps the added real estate might provide a home base for a presidential candidacy. The Observer helpfully reminded us that Bloomberg's own, nearly 7,000-square-foot town house is just a block north.