I will, however, be driving thru Corona this am on the way to San Diego to charge up the battery on my Bentley.

A couple of cheap things, if you have dark areas even if there is no plug you can install battery operated over sink lights for example. 

I use Insightly for CRM apart from proprietary CRM software modules as part of two seperate ERP systems in our other lines of businesses (brokerage and property management), but it is a lot of work to set up all processes (pipelines and activity sets for each activity).

I don't want to be held liable (financially or morally) if a tenant dies because a smoke  detector had dead batteries.

Will they change light bulbs, batteries, etc?  

Batteries in smoke detectors are $2 each.

I have an old thermostat that just sitting around that runs on battery.

Does this seem true regarding changing the smoke detector batteries?

I then started exploring Modular housing (NOT a mobile or Manufactured ones) and found that they are built more stronger and efficient,   mortgage lenders do not differentiate it,  public records and MLS lists them as regular houses,  personally visited their factories,  seen met home owners who has been living in modular homes past 10+ years,  almost all module companies offer a turnkey service that takes care of everything from preparing the site to permits to setting up the house.   

The one that I bought is basically a “SEO 101” course with different video modules on how to do on-page and off-page SEO.