You are also going to need to decide how to manage the property. 

And I was constantly more worried about my own project.

Sounds like an interesting project but I am sure there is more to the story.

Owner will need an Annual Owner Statement from your acconting system, reflecting those gross collected amounts and all expenses, including your management fees.

As you progress your bookkeeping business, you'll likely want to learn how to export statements from a variety of property management platforms, as investor books are housed in bank accounts, spreadsheets, and a variety of property management and accounting software!

To better project growth rates for the next five years, we should examine the pre-COVID period from 2015-01-01 to 2020-03-01.

I've learned a lot in my 4-year project, and it has been a lot of work.

I have close to 30 units which are all doing MTR and are managed by us.

The ability to effectively self manage would depend on the scale you are trying to buy. 

That said, I wouldn't let projecting rates factor into my decision as much as whether or not you want to pull the extra $$ out.