The social enterprise support body already has plans under way to open a third site in north London later this year, and hopes to extend the facility even further in 2009.
The announcement was made just as Can's existing office spaces at One London Bridge and Loman Street attracted their 100th customer, European animal welfare charity Four Paws.
"We were struck by the welcoming atmosphere rather than the exploitative, corporate and unfeeling offices we had visited before," said Marie-Claire Macintosh, head of programmes at Four Paws. "We were encouraged that we would be surrounded by other NGOs rather than corporate organisations."
Peter Murray, business manager of Can Mezzanine, said: "Being a social enterprise ourselves, we understand the needs of our customers and can offer something more tailored."