Michael Bloomberg Returns To Bloomberg L.P.

After a 10-day vacation and 12 years as mayor of New York City, Monday marked Michael Bloomberg's first day back at 731 Lexinginton Avenue, the headquarters of Bloomberg L.P.

Capital New York got hold of an internal memo from CEO Dan Doctoroff-- who also served as Bloomberg's deputy mayor prior to working at the financial software and media company-- that was sent to Bloomberg employees.

"When he's in New York, Mike will most likely spend a few hours a day working from his new desk on the fifth floor," Doctoroff's note read.

For employees occupying the fifth floor, Bloomberg's new residence should be quite interesting, if not downright terrifying. The 71-year-old billionaire is known to preach a rather intense work ethic, admonishing against bathrooms trips and taking sick days.

While specificities around Bloomberg's post-mayoral return to the company have not been publicly defined, he will reportedly take on a large role at Bloomberg View, the site's opinion page.

Bloomberg was a co-founder of Bloomberg L.P. in 1982.