@Dany Namou
I'm a Realtor in Texas. The only time you owe a commission to your broker is when you have a contract and either sell a property for a seller or purchase a property for a buyer. The reason behind this is "you" technically don't have a contract with the buyer/seller your broker does. The broker is paying "you" the commission not the other way around. Many people confuse this.
Now since you didn't enter into a contract under your brokers license, your not representing either party contractually, you owe your broker nothing and they have no legal authority to tell you otherwise. You don't need a real estate license to refer an invest to a friend, since you haven't represented anyone.
Now if you choose to represent the investor with acquiring this large development that's a different story.
IMPORTANT! Keep in mind this may vary in your state. I'm speaking from Texas law. The Texas Real Estate Commission has a free legal hotline we can call and speak to a lawyer. I HIGHLY recommend you too check with your states real estate commission if they have a legal hotline. By not means am i giving you legal advice do your own legal due diligence.
Best of luck!