Hi,
Might be I am pricing you a bit more, but I can provide you a fully working demo site at my server, before hiring me for the project. So you are at no risk.
I will create the whole custom wp-admin section through custom post type for property listing according to your requirement, that will be searchable from front end, and a reply form will be provided with each result listing.
Let me know if you are interested in my proposal, when you finalize my demo, you will first hire me an pay me my quoted price and then I will transfer the script to your live site server.
Thanks
Hozefa