The phrase "an existing office" is correct and usable in written English.
You can use it when referring to an office that is already in place or operational, often in discussions about business locations or organizational structures.
Example: "The company plans to expand its operations by utilizing an existing office in the downtown area."
Alternatives: "a current office" or "an active office".
It is a renovation of an existing office block, but it looks entirely new.
We actually saw a hack at the Disrupt NY hackathon just this weekend, called Posture.io, that offered similar posture-tracking functionality but that was retrofitted to an existing office chair.
You cannot use an existing Office product key to activate a new Mac download.
It's a renovation of an existing office building that was from back in the early 1930s.
But he will create a park and replace an existing office building — which is not landmarked — with a new performing arts center of his design.
Thus, any application to demolish and redevelop an existing office building will only have to satisfy detailed design issues.This may not matter in central London, where many buildings are listed and are unlikely to be demolished anyway.
By allowing a change of use from offices to homes without planning permission, the government is establishing the principle that residential use is acceptable on any existing office site.
The legislation overhauls an existing authority budget office to give it teeth.
Because I was interested in exposing biomedical sciences and health profession career options to academically and educationally disadvantaged students, Reede decided to enhance an existing position within the office to create my current role as research and science specialist.
Nevertheless, he predicted that once the economy picked up, "it might take nine months to a year for existing office spaces to fill up with employees".
Applying this design process to a set of existing office buildings, it is possible to evaluate the energy use of renovated buildings.
