I always disliked the per unit calculation as it did not take into consideration how efficiently the property is being run, the effect of deferred maint, satisfaction of the tenants, or desirability of the property. 

Most low income people are verbal rather than comfortable with the written word.To be the most efficient, use snail mail.

Most good property managers should be efficient enough to handle things relatively quickly.

It is more efficient to optimize the web experience.I am not affiliated with Cozy, but have used them a couple years and been overall very happy. 

Ideally, the buyer or developer would end up putting another business on the property to make money.Now my questions:Is a broker the most efficient way to sell our property?

You would most likely need a property manager for each city, it depends on your comfort level, but if you can find good deals in each city, why not just focus on one city for maximum efficiency.

You could start with energy efficient faucets and shower heads. 

Just seems like a good way to build some efficient rentals as there haven't been many deals out there.

I’m on the board of a property owners association in Wilkes County, NC (near Blue Ridge Parkway).  Occasionally, the Association ends up taking over parcels of land from owners who are delinquent with their annual due...

In terms of hot water, we were planning to install a Commercial High Efficiency Gas Water Heater in the basement (Rheem's SPIDERfire Water Heater, see here https://www.grainger.com/product/6FGU6), and use it to serve all 7 units.