The architects have submitted plans for the refurbishment of 35 Fountain Street in central Manchester for client IVG.
The redevelopment will include the creation of a new front entrance and reception, and a tenant's hub.
Jon Matthews, director at 5plus, said: "Instead of converting every inch of space to offices the client wanted to offer tenants something extra and the hub is a new concept for the city.
"It will be fitted out like a club class lounge and be a cool place to pick up a coffee and a paper, hold informal meetings with clients and customers or just hang out."
The hub will be for the exclusive use of 35 Fountain Street tenants.
The re-design will include secure cycle storage for up to 240 bikes as well as changing rooms, showers and lockers.
All six upper floor plates of the building, which totals 67,037 sq ft, are being refurbished to offer Grade A office space.
The building, which has basement car parking, sits in the city's business district and was recently separated from 17 York Street, allowing the scheme to be developed.
If planning is approved work will start by the end of the year and is expected to take six months.
5plus is currently refurbishing Trafford Town Hall, due for completion in spring 2013.