I also prefer the Unilin locking system( a tad more difficult to install but the overall strength of the locking mechanism seems stronger).

The tenant maybe be responsible to tell you when they know something is broken but they usually know nothing about mechanics of the house to know if the toilet is not working properly lol or not

Sarah is right cost of doing business ,I had a dryer knob it was broke ,had a different tenant not change a furnace filter may have caused damage but it was still under warranty they are all know the plan now .Plus it was a learning tool for me too,train tenants in all aspects of all mechanical in the house .

Also, the one accessible from outside must have working sturdy locks.All open able windows must have a mechanism to secure them in place.Every bedroom must have at least one open able window for ventilation, if windows are designed to open.If the unit has a 3rd floor sleeping room(s), & the family is eligible to use this room for sleeping; the owner must provide a safe method of escape in the case of fire.

Again, fuzzy on the details, but they also have a mechanism set up for investors that have bigger pockets than 1500$.

All windows are in great condition, roof and mechanicals appear to be fairly new and in good condition.  

Yet, we leave our cars with mechanics every day.

Or a free oil change from your mechanic because he is the one you use for major work.I know we live in the freebie culture, but you use the word "relationship."

Better if new construction with exposed drywall, like most other mechanical and electrical systems.

For the purposes of this question, we need to know how things are organized.If the rental is held directly, or through a Disregarded Entity (DE), and the healthcare business is organized as a sole proprietorship or DE, mechanically, what you're proposing won't work.