Buyers Commission on larger $10M deal

[Mike Xiao]

Hi,

Not sure if this is the right place to ask, but figure I'd give it a shot.  I have a client looking to potentially buy a $10M multi family apartment building.

I asked the seller agent what the buyer's commission is, and he said the seller is not paying buyers commission.  

Is this common in these types of transactions? 

If so, I am planning to work out a deal with the seller and agent to write it in the contract to get a buyer's commission.

Is 2.5% a reasonable commission percentage in these types of larger deals?