What's a true OPEX ratio for a 10 to 15 units property?

[Albert Lubin]

Hi, I am a new investor and I'm contemplating buying a commercial property to hold. I've been using the general "50% of EGI" rule to analyze properties but I am curious what a "true" range is. I do have some questions on the general 50% rule too. Is there an assumed percentage already embedded there for property management, CapEx and repairs? Or would those be on top of the 50%? Please advise, thanks!