I found an interesting site plan on the net - Rampart Business Plaza in Centennial Colorado - see
http://www.rampartbiz.com/index.htm
They basically use 30-foot wide buildings along the frontage of their property and split them with a 20x15 office area up front and a 20x15 storage area with a regular roll-up door in tha back - inside the gate where there are also standard self-storage buildings. The front looks like a typical strip mall with windows, glass doors and two parking spaces per unit. They charge $750 a month for the combined 600 square feet.
Here's the typical floorplan:
It looks to me like they use shared restrooms. I would assume that each unit is individually metered for electricity and each has it's own phone hook-up. You could probably offer WiFi Internet access for an additional fee.
The key to success here is to build in an area with a shortage of small office space. The challenge will be to find land that is zoned for both offices and mini storage.
Also see Trachte's webinar on this site "Making MORE of Your Self-Storage Site: Boat/RV and Mobile Ancillary Storage". There is a brief section about combining office space with self-storage and a picture or two.
http://www.insideselfstorage.com/web...ew/info/id/177
I can help you with a site plan if/when you get that far. Email me for some samples of my work.
Best of Luck,
Steve Smith
Custom Site Plans
SteveSmith@ByteOne.com