No offense to anyone (I won't name any) but I checked all the open-source software for real estate (even outside Joomla) but was even more happy that this one is in Joomla because I love Joomla!
Realtyna is one of the most flexible and extensible extension I have ever found. Yes, the only thing bad that you would feel about it is that it's expensive but after you purchase it you would find its worth the money with such a quick and helpful support.
The top features that I found are:
1. Multiple measurement and currency units
2. Completely flexible property listing form
3. Completely flexible property search
4. Completely flexible agent profile form
5. Agent listing and search
6. Paid packages support with three payment processors included: Paypal, 2CO & Bank Receipt (Offline Payments)
7. Many many more. Checkout yourself as I cannot write every thing here.
I feel very confident that this would make the developers more motivated and innovative as I do not expect them to go and relax, since they have not only done hard work but still doing.
Keep up and we are following you for more surprises!