How much to get paid for property management

[Sami Gren]

hi, I have several apartment buildings that I manage on my own, but recently a friend of mine asked me if he can invest with me,  so as a good friend I agreed he should put in half of the money for a residential apartment building.

but now I realized that since I will be the one managing the property, I will need to take a fee for myself, so I was wondering how it should work. .. from what I heard and I see online  anything between 5-12% of the gross rent, or $80-100 per unit, and all these prices are in in a very wide range.... so I would like to know what are the real average numbers.

also I see it can get very technical like when I renovate an apartment whether there are turnovers, late fees, renting out apartments etc. .

so I em wondering if someone can give me an exact run down exactly  how to work it out, thank you

(I know done wool ask what  I wanna include, but that's exactly my question what could/should I include etc. Etc.)

[PLEASE NOTE: WHEN I SAY 10% OBVIOUSLY I WILL ONLY TAKE 5% FROM MY FRIEND SINCE I AM A 50% PARTNER AND I AM ALSO PA YING HALF OF THE PM FEE....]