Office building expenses

[Collin Forgey]

Hello,

I'm looking at an office building deal. Unfortunately, all the current tenants have Gross leases. I was wondering is there an expense rule of thumb (i.e the 50% rule) for office buildings? Once the leases expire I will certainly begin charging CAM fee’s on the new leases.

I guess I'm having the most difficulty budgeting maintenance expenses. Any insight into deal analysis for office space would be great! My only experience is in multi-family thus far.

Thanks