Houzz is primarily for residential buildings but here are some images that might give you an idea of maximising space and light You basically want to keep a level of space and light so white or a soothing pale blue can work if the work is stressful. Good lighting and good natural light. Perhaps your management box in the center as four squares and slightly raised so you can see out the windows but also allow your staff to benefit. A rest and relaxation area for some breaks and a kitchen and toilets.

So much depends on your lifestyle. Will you typically be eating out in that dining area, or is that just for special occasions, and other meals will you want a convenient/cozy place to eat in the kitchen? Are you preparing food for large or small family? When you entertain, will people gather in the kitchen while food is being prepared, or would you prefer the food prep to be more out of sight? With the kitchen tucked away in the corner like this, think about the flow between the kitchen and out into your dining and living spaces, for how you envision using the space. Whatever is placed in that far corner will be farthest away from the dining/living area, and possibly require a trip around your island, so keep that in mind for convenience consideration.

If you could post pictures that would help, also make sure of your building's codes/rules, keep in mind weight, drainage, exposure (sun/wind/light), privacy concerns, lighting, etc. and consider getting professional design help for someone who specializes in roof gardens. You don't have to do everything all at once but a design professional could help you clarify your vision and give you ideas you may not have even thought to incorporate. Best of luck, 800 sf of outdoor space is wonderful. Don't forget you've got to get everything up to this space too.

Hire a local designer who can actually see your space and where the plumbing connects are located. Generic layouts will never help with your specific space.