We head to the ground floor of the Tea Building to Pizza East to chow down with Alex Stegmann, co-founder of yReceipts, a guy who wants to get rid of all the paper receipts that clutter our wallets.

FORBES: Shoreditch Tech Safari: Poke, Ustwo, yReceipts

Versace was shot to death on the doorstep of his home in 1997, and spree killer Andrew Cunanan is believed to have killed him and four others before Cunanan shot himself in the head on the upper floor of a houseboat in Miami Beach, where he was holed up to avoid police after the Versace shooting.

CNN: Story highlights

In the waiting room on the executive floor, the head of risk from a subsidiary in a neighbouring country is pouring himself a coffee, having driven for an hour from his own office to talk about a new computer system.

ECONOMIST: Face value

"Everybody is out there trying to replace the former function of the floor broker, " says Steve Sanders, a managing director and head of business development at Interactive Brokers.

FORBES: A New Kind Of Exchange

Gibraltar, jokes John Lothian, head of electronic trading at the Price Group, a brokerage that operates on an upper floor of the CBOT building.

FORBES: Companies, People, Ideas

In an unremarkable office building one floor above, Edward Anderson ignores a nasty head cold and scrutinizes the expense budgets of a handful of private companies.

FORBES: Cool Heads