Companies like Opendoor opened the door to a new way of buying and selling properties by inserting a strong middle player who could buy houses or apartments and redevelop them at scale, and then sell
<img src="http://eu.beta.techcrunch.com/wp-content/uploads/groupalia.png" class="shot2" />
<a href="http://www.groupalia.es">Groupalia</a>, a Spanish group buying site, has raised <a href="http://www