Leasing Commissions for when I have already have a tenant

[Jason Mak]

Hello BP and all commercial guys

I own retail property and have been talking to potential tenants about a vacancy.  I'm considering to hire a leasing broker to help me navigate and negotiate the lease.  The leasing agent obviously doesn't have to spend the time marketing and showing the property but I would be leaning on his expertise and market knowledge to get the best least possible.

How much should I expect to pay the leasing broker to help me negotiate the deal?   

Any advice or experience on this would be helpful.  Thanks