你的注意事项非常好，that’s exactly what’s happened when we bought our

First house. 我们去建商那里看房子时登记了，所以建商不允许我们再有paying agent. Since we were first time buyer and not sure the buying process. We brought a friend realtor when we formally talk with builder and paid friend realtor $200 for going with us. That's about 25 years ago. If we knew this rule before and not sign our name, the  builder will pay the 2% commission to buyer agent.