The additional capital helps too :)

My wife and our two kids love it.

There are often hidden costs--such as: engineer certification of the structure (depending on what the city requires) smoke damage to portions of the unit(s) that are "not affected" additional insurance during the rebuild, sealing the framing that has smoke, etc. 

Who would have guessed Wells Fargo takes 2 additional business days to wire out after charging $30?

In addition, learn everything you can:1) Read books2) Listen to podcasts3) Go to real estate meetups4) Find ways to add value to a potential mentor.

As your assets increase you may want to get a personal umbrella policy (PUP) to cover any additional liability.

On the inside, think about every doctor's office you've ever been in: the major additional system comcern is that Plumbing is everywhere.

It also creates some additional costs (setup, maintenance, tax reporting) and will limit your financing availability (more expensive commercial loans).Depending of your threat level and the amount of asset that you are protecting it may be worth the cost.

Management goes through rent rolls and finances of prospective sites, and I do physical inspections, gather certificates, check and estimate vacant and contracts, etc.It's usually an additional service in my experience, but works out well when we start take over new contracts.

Luckily I bought a property that was a fixer upper and I did all the renovations myself, and it also had a basement suite for an additional source of income. 4 years later, this market has finally bottomed and I'm just able to re-finance and pull out some capital.