What % do commercial real estate agents make on an average 5-year deal (office space)?

In some markets like San Francisco it will be measured on a per square foot amount, but in most markets it's based on a percentage of total rents over the term. In Los Angeles, 6% is usually budgeted for a new deal, and that will be split (not necessarily equally) between the tenant rep and the landlord rep (both rates would be negotiated independently).

My deals are pretty much 1 months rent on a 1 year deal (8%+), 6% on years 1-5, 3% 6-10 & 1% thereafter. The bigger question is whether taxes, inflation adjusters or CAM are commissionable.

To reinforce each market is different, SF is $1 or $0.50 per rentable square foot while the SF east bay is 7.5% for a new deal. 5% to the tenant rep and 2.5% for the landlord rep.  On a renewal, it's typically 2.5% to each (tenant rep and landlord rep).