What are your main investment goals—cash flow, appreciation, or something else?

Main thing to watch out is DSCR Ratio.

Hopefully this helps clear up the main point of your post!

I'd like to add another SFH to the business  in the near future with the main goal being grow the business as fast as possible. 

Now my main issue is I need a fire detection system in a enclosed back porch that leads up to all three floors, but I don't know what's the minimum I would need to be compliant or that the fire marshall is suggesting what he wants or recommends.

Main question in other countries is ownership and taxes.  

I'm not sure if we can like to articles on our own websites here, so to be safe I'll just suggest the IRS web page, which does do a pretty good job of explaining the basics: https://www.irs.gov/taxtopics/tc510The main thing to know if you're going to claim business miles is that you do need to keep a log of every business trip. 

What’s your main focus, or what are you hoping to get out of your journey here?

I currently own and self-manage two STRs in Maine and should be closing on a small 'cabin campground' with 10 cabins nearby that will also be operated as STRs. 

Best decision I've ever made. 4-6% average annual appreciation rate, stable job growth, population growth, drivable to the Bay Area, close to Lake Tahoe, no state income tax, 4th lowest property taxes in the Nation, much more landlord friendly than CA, land constrained meaning limited supply, etc.