The above answers are applicable if you have a mom-and-pop building. For better buildings in larger markets, the listing broker may get 3-5% of any new lease. If there is a cooperating (tenant) broker, then an over-ride may bump the commission up to around 7-8%, where the tenant's broker gets the majority (say 4-5%) of this split.
Also depends on net vs. gross leases as well as lease term.
Perhaps you can interview a few trusted brokers, and let them propose listing your building. The average commission will become clear.
Mar 24, 2012