A great high functioning portfolio along with a decent W2 goes a very long way to achieving your goals. 

WikipediaSustained and significant population growth: Prices and rents are a function of supply and demand.

The property should be clean, functional, and safe.A well-maintained property attracts higher-quality renters that will pay more, stay longer, and take better care of the home.

Law is how we function as a society.

Something that easily integrates to the Accounting module so that $ amounts from repairs are easily and automatically reflected in the Accounting functionality / reports.

How to take, save, display, and organize pictures. 

I've found that using thia tool has significantly improved my communication with tenants and reduced the number of late rent payments.Finally, I appreciate the reporting functionality.

@Shaun Hunt believe what you really want to do is start a "Master LLC" that can function as a PMC.You would then sign management agreements between Master/PMC & property LLC's and have all income & expenses run through Master/PMC LLC, and only have to "settle up" annually with the property LLC(s).Check with a qualified tax professional.

If not and I have to go out and build the team and organize the deal, I will factor that in too. 

Like any other system these days it has a lot of features but I use it mostly to organize my data.