hello,
You may connect real estate manager with payment subscribe system with help ours simply membership component.
http://ordasoft.com/simple-membership.html
So with help simply membership - you will can create payment or free joomla subscribe member groups - and connect with these groups some features with help real estate manager options.
In real estate manager options you may set what joomla user group can do some thing.
Thanks,
OrdaSoft team