Dear Sir/Madam

We live in a community of 8 villas and share a pool and community garden. Before we bought the place, there was a neighbour (a former president) who had illegally ie without community permission extended his property by almost twice. A few other neighbours have followed suit. A new neighbour has just moved in and wants to close their terrace. All these changes/extensions have greatly altered the coefficient of the community. How can we go about changing the quota when it is pretty obvious those who have extended will not agree to it. We can legally make them agree to changing the quota??