My home office is 12' by 12' where I do a mix of programming, devops, and electronics. I sometimes have co-workers come by as well to pair-program or whiteboard.
- Wrap around low wall'ed cubicle desk with panels to hide cabling. It is big enough to hold three 27" monitors, two laptops, and three sets of keyboards / mice.
- Rectangular desk for holding electrical equiptment and potentially a second laptop if co-worker visits.
- Fire safe with letter sized file drawer. 2 cu feet.
- Filing cabinet. Half-height letter sized.
- Wall length closeted sheving. Also doubles as network cabinet. Lots of room for boxes, supplies, and odds'n'ends
- Two whiteboards. Full sized. 6'x4'
- Two dressers with drawers.
- Tool chest with drawers.
- Two good office chairs.
- Hue lights (I change the intensity and color depending on mood or time of day).
- Nest security cameras.
- Bathroom with shower.
- Small table vice.
- Portable infrared heater or air conditioner depending on season.
- Picture of Yoda.
I don't live in an area where security is as big of a concern, but I do keep the window shaded, files backed up in cloud, and drives encrypted. Beyond that, things like cameras, kensington locks, safes, and deadbolts can only slow thiefs down. But they are a good idea just for discouragement. I do love the new digital locks around now. Utilizing one which you can open and close quickly using biometrics or a phone will keep you honest in locking the place up.
On the home front, I do sometimes utilize the office for emergency relative storage (guest room). There is enough room for a queen size bed in the center.