Amol Sarva, CEO of Knotel, talks the company's latest office building, which will open in Gowanus, Brooklyn and the company's milestone, which will see it pass 600,000 square feet of space in New York and San Francisco.

Sarva says the demand for office-sharing spaces has grown because of the flexibility they allow customers to have. He says that the days of 50-year leases are over and that right now, because of the rise in start-up culture, the company is seeing the most success in New York and San Francisco. Sarva also weighs in on the company's plans for international expansion.