with such a big scale development, setting both to sell their unit doesnt mean anything. you may refer to TROPICANA GARDEN located at Kota Damansara. 2-3 year already their still unit un-sold.
IMHO i feel the mall of star city is workable compare to Emerald which is more inner side of selayang. and the road lead to emerald is not in ideal condition. starcity can attract rawang ppl and batu cave ppl come to shop instead of going to KL City. imaging so many of car will pass thru from and to rawang.

Too many competitor around that area. Some more this project seem like not performing well. Most of the investor will eye on other project... Good luck

Tengster Kor, i have a same though. basically is due to:-

1) selayang near to klcity, publica, hartamas; which is more happening
2) selayang need more of higher end development to sustain the mall. otherwise they will just go to other shopping center nearby
3) emerald avenue is a good example, even they tried so hard to bring in the fancy cafe and restaurant. but cant even attract people to visit.
customer in this area mostly student & people working in pasar borong.

So far Cant see any bright side for starcity.