I would like to create a real estate website (based on joomla 3. ..), where real estate agencies and private owners can post their properties (for free for the owner or realtor at the beginning, but financed via advertissing, paypal, visa) and later for each post via visa or paypal, where costumers can add their comments to a specific property....).
The layout should be responsive and minimalist.
A second project would be to create an android and iphone app based on the same content.
A reference website could be, for ex. www.athome.de.