We have developed a web based platform for Property Owners/Builders/Real Estate Agents to advertise their properties/flats/apartments. Registered users would be able to display detailed information regarding their properties including videos etc. on the website. Buyers would be able to see the details of various properties along with videos and send queries to owners / agents. This web site is for full service real estate agency with all the bells and whistles. It is an extensive web portal (similar to your reference sites), that allow buyers to search properties using different criteria(s) and the chosen property can be listed in google map.
It is an interactive web portal that allows buyers and users to trade online through this portal (integrated with various social media websites like Twitter, Facebook and youtube).
It also allows users to list their properties (as per your requirements).