Err....don't mean to be wet blanket, but I don't see jamming studio in Singapore to be able to survive, cause I am operating one myself.
Already got seasoned players (boon, SC, BMC...etc) which laps up most of the market already (small market).
I operate it more like a side line. Also, your concern is a major issue too. Shopping centres and shops are a bitch to get the approval and renovations difficult to be acceptable by the safety board.
Bottomline, you have to spend lots of money just to do up the place, then the rental is nearly immpossible to maintain, based on jamming income alone.
Then there is the neighbour thing. Imagine, if I have a shoe shop and someone open a noisy studio beside me, it'll surely affect my business operation. And you know, Sporeans are very sensitive, any small unhapppiness, complain...and complain to authorities. After 3 times, you will face the music from the law. So spend all that money for nothing.
You cannot cut out the noise totally, if your jammers are a bunch of young punks out to have "fun" at your expense. They won't understand, you scold them, they curse you. They will jam at max out and the noise sometime you yourself cannot bear.
Think about it.
If you want, you can come to my studio, and we have a chat. Seeya
Regards.