We use the solar to preheat into a large (100usg) storage tank, then each unit has an in-line water heater to raise the temperature (if needed) on the way to the unit.  

Houses are 100% hand assembled on site by huge teams of people with all parts delivered to non-warehouse locations.

What kind of temperature and environment are you dealing with for most part of the year?

These big white elephant buildings, like the old warehouses in that area of Brooklyn, are something we like to seek out.I'll do some research with the city planner's office and most likely get in touch with you.

If you have to hire a PM, you can reduce your monthly fee to $80/month with Renters Warehouse BUT please be sure to manage them carefully. 

You get a $20 million warehouse line from Columbia bank.

Austin is hot temperature wise and real estate too.

Also try warehouse outlets for furniture that you need or want new. 

Would tenants control the thermostat or do I set a base temperature?

Nationwide averages are about as useful to me as the average national temperature.