Broker fees - is it legit? and how much would it be?

Hi Everyone,

I found a brand new build property; Its will be ready next year march. But I found the property thru a broker and they are charging me a broker fee of $6500 and they are also asking me to pay an earnest deposit of 5K to block the property. Its a duplex costing around $350K and with good chance of value increase. To do or not to do? I know about the earnest cost but the broker fee to be paid by the client seems a lot.....is the amount a lot or is this industry standard?