2 words

Public interest vs personal interest

Full stop

Well if you notice properly, that is involving the RTS etc. Hence, the reason will always be like public policy/"for greater good". Similarly, you can go and obtain the plans for the RTS project (not too sure on how JB works). Example, the KL plan has plans for purchase so you will know if you are affected from there.

Also, they will inform you, write to you, send you notices etc. Similarly, government gazettes. That one you'd have to look out for too. Will take some time to go for a few meetings with the land office/admin etc.

Fair compensation can happen. If you are not too happy with what the state is giving, under the LAA, you can object to it and they will move the matter to the Court.

You will have your own valuer, the government will have their own so you valuer when you file anything in court. Then, the judge will be assisted by 2 independent valuers (one from gov, one private) before the court makes any decision. So if you have enough data (such as recent sale & purchase prices to compare)/affected routes etc, you'd probably get more compensation than what was awarded by the land office.

No prob. Still compensation might vary even if you bring it up to the court. The independent valuers would probably agree with the original valuation on certain claims so its a hit or miss depending on situation.

Oh ya, don't miss the meetings (if any) even if your taman representative/JMB "on behalf" of everyone. Their views might not be yours so its better to go yourself to all these meetings.

But to change it to commercial without the "greater good" policy it will be tough. Especially if the land is further away from the projects (MRT/LRT/flyover etc).