Over two years, I built up 12 doors, which now generate about $100k in net income annually.

Couple hundred bucks a door monthly cash flow, solid ROI, and yes plenty of appreciation.I personally make well over $100k/yr cash flow from 21 properties here.

And it is unlikely you know the correct questions to ask.Drive over, knock on the door, and have a conversation.

After all rape is just the word of the victim that it was not consensual sex, breaking and entering, well the door was already broken, every theft, every credit card fraud, well the owner said I could. 

Direct mail, SMS, door knocking, Facebook ads?"

Contractor burnout is another concern.Owners like to think it's so easy to just pick up the phone or send a mass email to get contractors beating down their door to give them a bid and hopefully get the job.Doesn't work that way!

It all started with removing some interior walls and changing the floor plan, removing a chimney, adding a bedroom and bathroom, installing patio door to the backyard, and completely renovating every other interior element What was the outcome?

XD It is pretty much shut down once the city knocks on your door.  

I co-own a STR PM Co with around 90 doors currently and am also a broker who specializes in STR Investor acquisitions. 

Bigger doors and windows look great but replacement is hell.