If I have a CEO office in GTA Online, do I need an apartment? As the office has living quarters and a garage.
You don't need any properties in GTA Online, but purchasing them will offer benefits.
The CEO offices do offer all the comforts of an apartment including bed, shower, and changing facilties but they lack a planning room.
A planning room, which is part of the high-end apartments, will be required if you want to be able to start hiests yourself.