please refer to this post
http://forums.condosingapore.com/showthread.php?t=7761
please consult your lawyer as well. I'm surprised that you are asking this question at a forum and not to your lawyer. If that is the case then buying property is a very risky venture for you as you do not take the time to consult the person the proper authority. I've not seen anyone in this forum who can give you advice of this serious nature and i sure haven't met any agent who is worth his salt to even tell you whether a property is good investment, let alone "property" rights issues.
Am sorry if i sound rather harsh here but you're not buying something that's $10 or $100/ month and you need to have the right attitude as to how to handle such investment and have the courage to ask the right people.
Though i understand you're already taking the steps to ask someone about it here, this is something that should have been cleared up when you purchased the property.
Go ask your lawyer or any lawyer. If you need i can recommend you one that's good.
All the best and my best regards.