The office could be a tiny box room partitioned on one side of the man-cave and it would be the place I sit quietly and get everything done. At the back of the man cave there would be a kind of bar but it would be a place I keep soft drinks and snacks. There would be a fridge with a clear door so you can see what is in there. There would also be a small heater, the heat would gather in the ceiling and heat up the greenhouse above so the tomato vines would survive the winter. The heat would be used twice, it would heat up the man-cave and seep out into the greenhouse above.
If possible there would be four recliners in there with a projector that is hooked up to games consoles and a smart TV player. The bar at the back would have the projector and some stools that can swivel around. Up to 8 people could be in there watching a movie on the projector.