It's nice, that you want to share your income with us. I will probably have a lot of customers for real estate manager, but at this time I have to deeply alter this component to fit it to our local market. I will also need to add some offers exchange system to synchronise offers between real estate manager instances and export data to other systems.
I can help you to build system like that. I have experience in implementation of web applications and on real estate market, backend and partners. One thing that I don't have is a group of programmers and time for development.
If you can provide a customised and extended version of real estate manager for us, we can sell and implement a lot of licenses for you and maybe exclusively for you. If you're interested, I'm open for negotiations.