--We always try to keep our units 90%+ occupied (so that our returns to the investors stay robust)...

You need to understand how to use their class and job functions extensively.  

If a property is 30 units versus 300 units, I'm assuming the property maintenance and tenant pool be a function of the area and property management in place.  

In addition, they have build in functions that you can put in your own assumptions.

And as it is a City Ordinance, the process to modifying it is quicker and more robust.

Better to outsource those functions until your consultant fees exceed the cost of salaries for equally qualified employees (a pretty high bar).You have a great roadmap, just be open to tweaking it as you learn what works and what doesn't.  

It has revenues, expenses, customers, vendors, and a marketplace in which it functions.  

Do whirlybird vents need to be installed level to work, or can they function if installed at an angle

9/10 times that only means the water is off in which case you buy it cash, get the plumbing functional, put a conventional mortgage on it with 20% of the purchase price and cash out the other 80%. 

I am using 3rd party management (they use AppFolio); so, my needs are pretty basic and do not include any management, invoicing or payroll functionality...just basic accounting and reporting.