n. A place a person works other than their office or home office.
2013
The third workplace, commonly called co-working space, combines the amenities and technology of a traditional office with the flexibility and lower expense of a home office.
2013
There is plenty of talk in alternative workspace circles about the third workplace. In other words, places [sic] to work beyond the office and the homefront.
1999 (earliest)
The Orange Studio takes the increasingly popular concept of Internet cafes a step further. It has combined the "computers and cappuccinos" concept with state-of-the-art communications equipment to create a unique kind of shop for businesses…."We wanted to create something like Cheers meets the British Airways executive lounge. We see ourselves as the third workplace outside the office and home."