I am searching for a Commercial Real Estate plugin

I am searching for a Commercial Real Estate plugin that will provide search capabilities on my client’s site for commercial type real estate. It is located here. http://vegasagentlee.com/

I already have a solution for residential search and have the IDX all set up. However, I have not been successful in finding something for commercial listings. Everything I have found just offers the ability to iframe their search pages into my client’t site, but does not retain the potential customer. Once they have found a property in the search, they are directed to the listing agent, which takes my client out of the picture. Not an ideal solution. 🙁

If anyone knows of a solution that will provide the ability to list her own commercial listings on her page and possibly display other’s listings as well, but refer the potential customer back to my client for making an offer, please let me know.

Thanks,
Mike