I see that you are only targeting the big companies. This is really smart, since those companies tend to pay better and their employees will have a bunch more cash to throw at their house, leading to a bigger commission.
What are your plans for adding new companies? Are you going to branch out into firms that might not pay as well? Stick with the "top 1%" companies but in different cities?
Real estate service that focuses on tech people seems lucrative. Good idea all around.