Hello Paul
I understand that XMod (
http://dnndev.com/Home/tabid/189/Default.aspx ) can offer this feature, it is extremely flexible and can be used for much more besides. But it is not an "out of the box" real estate module, you would be required to customise it to suit yourself, which can be overwhelming because it offers so many options. The module documentation is extensive and helpful.
Worth a look.
Lynn