How much to charge for commercial property management?

[Lex Shan]

I have been a residential property manager for 9 years and not until recently do I have an opportunity to write a proposal for a commercial management in San Francisco Bay area.

It's a office+flex mixed use building with a total of 6 tenants and 40k sqft. One NNN lease and 5 leases are full service. I estimate the gross rent should be between $50k to $80k.

There is some common area janitorial, landscaping, signage i need to manage. Responsibilities include collecting rent, paying operating expenses, be the first point of contact of any issue.

What do you think other commercial management companies will charge for some thing like this?