Property includes street parking, 3 designated parking spots and a car port with 3 slips and lockable storage for each slip.

Its owned by a corporation, you will need to properly designated individual(s) in the corporation to make the sale to you. 

If it is a UDC historic-designated area there should be information available... and yes, a historic neighborhood can really ruin your day!

Right now - we run most of the income/expenses for all properties out of one "managing" checking account, and then just designate every expense for the property it's for, thus allowing us to do the bookkeeping from there. 

Turning that residence into a rental property will void that designation and allowing it to remain is fraud.

If you like - please better describe your 'professional' designation.  

The house would be designed in "panels" that would be prewired and have junction boxes where the panels connected.

I own a small design/build furniture company located in Seattle, and I have been thinking about using my furniture, and my design sense, to start staging homes.  

Feel like a bubble?  

These will be less expensive options but be aware that the municipality might be asking for more.If the municipality is asking for zoning issues, ADA requirements, historical items or design changes, etc. then get an Architect.