See the circled "Mini links"? 

Last week we did a mini unit on financial literacy.

In the past I added mini splits to units, I upgraded a terrible kitchen with a tenant in place.  

This is a MASSIVE generalization because price will fluctuate based on needs of the home, style of the HVAC (split, package, wall package, mini-split), filtration in the home, etc.

I'm hoping Vallejo becomes a mini version of Sausalito.

Mini splits are too expensive unless you are planning to stay there long term.

Can refi an existing mortgage to a shorter term “Mini Mortgage.”

Is this a common thing (STR mini community)?

Again, returns will be lower, but your risk profile is reduced, and steady appreciation is usually more assured.Like it or not, if you do buy RE you will become a mini expert in your area of endeavor.  

It is a scrape and rebuild economy.There was a great mini documentary about it this actually, and they even talked about the city I lived in.