There are various other items that may come up such as: Proper firewall suppression, adequate entrances/exits for fire safety, stair safety, size of kitchen appliances, etc... for my specific example. 

This is NOT Business Credit.By establishing a separate corporate credit profile on the EIN Number (separate from the business owner's SSN/FICO), investors can access substantial business credit lines, capital for property acquisitions, and renovation funds without personally guaranteeing the debt.This approach creates a powerful financial firewall between personal and business assets while potentially generating a significantly larger (ROI) through reduced interest rates, increased borrowing capacity, and the ability to scale investments more rapidly.The education gap surrounding EIN corporate credit means savvy investors who understand and implement this strategy can gain a significant competitive advantage.

Every webserver, firewall, router, modem in everyone's house.

I attribute it to having to  learn new skillsets (such as firewalls) and the market in general.  

A properly-formed, properly-operated LLC is like a firewall for liability: everything inside might burn to the ground, but the fire won't get to things outside the LLC.

You can find CZO info here:  https://czo.nola.gov/article-15/From what I have been told any multifamily with 3 or more units is required to have a fire suppression system, unless you do townhouses and place a firewall between them. 

The county stated in order to make the home a two family I would have to install a firewall between the two halves.

Free Advice: Create two LLC's one for flipping and one for your passive as this will prevent domino effect if one aspect fails and make sure you setup proper firewalls to prevent commingling funds. 

The county's web server can utilize cookies, encryption, redirects, javascript, json responses, firewall rules and many other means by which to make scraping difficult.

And if you really want to do it right you have to put each one in an individual LLC, as the whole point is to build firewalls between your assets.