Midtown

Like the name suggests, it's the midsection of Manhattan. Definitely stops north of 59th Street, may continue as far south as 14th Street.

It's mostly offices. Lots and lots of them. In fact, it's the largest business district in America. It also contains the shopping bits of Fifth Avenue, Rockefeller Center, the Empire State Building, Times Square, and other touristy things you will think yourself well above visiting by the time you leave Columbia.

Unfortunately, once you leave Columbia, you will likely be forced to sell out and work in an office building here anyway.

When someone says they work on Wall Street, they usually actually work in Midtown.