With only seven doors so far, and all my stuff more or less input after two days, I think I will stick with QuickBooks for now, as I got the desktop version and won’t have to pay anymore.

Vadim offers the common list, but in my experience, there will always be something.  

It will be fun and insightful.  

What you may save in material you will make up for in engineering and architecture fees. 

Provide value and clients will come.

As a general rule, each entity that files a separate tax return (partnership, s-corp, c-corp, etc) will need its own QBO subscription.

This is a subjective question, and everyone will have a different answer to the same area.

You will have to look further such as the Contra Costa county.

If you are sitting on the "fence" waiting to purchase a property because you don't know which candidate will get elected or which "political party" will be more favorable to your purchasing decision, consider the graphs provided below. 

A 72-T exemption known as a Substantially Equal Periodic Payment (SEPP) is a pretty rigid agreement.I don't think you will be able to accomplish the rents-only goal.