We are both in SoCal so I can relate environmentally ;-) One thing I miss about my previous shop is having the large (garage) door hidden from the street. I could open the big door with impunity and confidence that I wasn't wetting any crooks appetite with a view of my tools. I also enjoyed the fresh air and sunshine. Seriously consider sky lights (or
Solatubes if you are going to finish your overhead).
In my current shop I am pretty happy with at least one exception. I would make a separate out-building for my lumber storage. I would have a small wall rack to hold lumber to be milled, already milled or completed parts for the current project. A separate area for finishing would be nice too but, I mostly finish by hand so let's not get crazy.
A lean-to for the compressor and the dust collector would be a blessing. Between those two space hogs and an out-of-shop storage area for material, I would have plenty of room in my 20' x 30' area.
Needless to say, the usual rules apply;
- build your dust collection into the shop, don't add it on after.
- put in twice the number of power receptacles you think you will ever need in this lifetime then add 20%.
- always have at least one light fixture on a separate panel so if the whole shop blows, you aren't left in the dark.
A wood floor would be cozy but, a couple $20 packs of foam mats from Sam's Club and I have all the foot-leg-back easing, dropped-chisel-saving floor covering I need. I have re-org'd the machine positions a few times as my methods and workflow evolve. ASTM-2729 DC ducting is super easy to change and Santa Fe Pipe could be nearby your new digs . . . if they're still there(?).
A couple of 12/3 x 40 foot cord reels easily solve any ad-hoc power needs I have ever had. My main vac is stationary, tool activated, has a dust deputy and about 30' of 2-1/2" hose. With the addition of a hose-whip for whatever tool I may be using, this has worked out great.
Make your assembly table mobile so it can double as a work surface or collapsible so it can get stowed when not in use. My latest version is the torsion I-beams of different lengths and a couple of adjustable metal saw horses from the BORG. So far this is the best version yet as I do not have an extra 120 square feet for a permanent assembly platform and the room to work around it.
Setting up a new shop is a blast. Have fun, enjoy and take us along . . . we're so needy.